Merge pull request #824 from telemt/flow

MSS Tuning
Docs for MSS Tuning
2026-06-28 05:41:11 +03:00 · 2026-06-06 12:25:33 +03:00 · 2026-06-06 12:24:27 +03:00 · 2026-06-06 12:17:19 +03:00 · 2026-06-06 12:11:05 +03:00 · 2026-06-05 14:36:00 +03:00
122 changed files with 15543 additions and 9886 deletions
@@ -52,6 +52,10 @@ By submitting a PR, you confirm that:

 AI-generated code is treated as **draft** and must be validated like any other external contribution.

+The problem isn’t AI as a tool, but the dilution of responsibility. If the commit history says "Claude/GPT authored this", then who is accountable for the bug? Claude? GPT? Anthropic? OpenAI? Samuel Altman?
+
+The user who didn’t read the diff? No one? But, in a sensitive system, *"no one"* is an unacceptable maintainer model.
+
 PRs that look like unverified AI dumps WILL be closed

 ---
@@ -111,9 +111,9 @@ checksum = "7c02d123df017efcdfbd739ef81735b36c5ba83ec3c59c80a9d7ecc718f92e50"

 [[package]]
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 dependencies = [
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 "asn1-rs-impl",
@@ -121,7 +121,7 @@ dependencies = [
 "nom",
 "num-traits",
 "rusticata-macros",
- "thiserror 2.0.18",
+ "thiserror",
 "time",
 ]

@@ -167,15 +167,15 @@ checksum = "1505bd5d3d116872e7271a6d4e16d81d0c8570876c8de68093a09ac269d8aac0"

 [[package]]
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-[[package]]
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-
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@@ -234,9 +228,9 @@ checksum = "c4512299f36f043ab09a583e57bceb5a5aab7a73db1805848e8fef3c9e8c78b3"

 [[package]]
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@@ -266,9 +260,9 @@ dependencies = [

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 [[package]]
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@@ -299,9 +293,9 @@ dependencies = [

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@@ -674,9 +662,9 @@ dependencies = [

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@@ -771,9 +759,9 @@ dependencies = [

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@@ -1070,9 +1058,9 @@ dependencies = [

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 [[package]]
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@@ -1104,7 +1092,7 @@ dependencies = [
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 "rand 0.9.4",
 "ring",
- "thiserror 2.0.18",
+ "thiserror",
 "tinyvec",
 "tokio",
 "tracing",
@@ -1127,7 +1115,7 @@ dependencies = [
 "rand 0.9.4",
 "resolv-conf",
 "smallvec",
- "thiserror 2.0.18",
+ "thiserror",
 "tokio",
 "tracing",
 ]
@@ -1152,9 +1140,9 @@ dependencies = [

 [[package]]
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+version = "1.4.1"
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@@ -1197,9 +1185,9 @@ checksum = "df3b46402a9d5adb4c86a0cf463f42e19994e3ee891101b1841f30a545cb49a9"

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+ "hashbrown 0.17.1",
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@@ -1406,7 +1394,7 @@ version = "0.11.1"
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- "bitflags 2.11.1",
+ "bitflags",
 "inotify-sys",
 "libc",
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@@ -1458,16 +1446,6 @@ dependencies = [
 "serde",
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-[[package]]
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- "serde",
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-
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@@ -1485,27 +1463,32 @@ checksum = "8f42a60cbdf9a97f5d2305f08a87dc4e09308d1276d28c869c684d7777685682"

 [[package]]
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 dependencies = [
- "cesu8",
 "cfg-if",
 "combine",
- "jni-sys 0.3.1",
+ "jni-macros",
+ "jni-sys",
 "log",
- "thiserror 1.0.69",
+ "simd_cesu8",
+ "thiserror",
 "walkdir",
- "windows-sys 0.45.0",
+ "windows-link",
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+name = "jni-macros"
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 dependencies = [
- "jni-sys 0.4.1",
+ "proc-macro2",
+ "quote",
+ "rustc_version",
+ "simd_cesu8",
+ "syn",
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 [[package]]
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@@ -1561,11 +1544,11 @@ dependencies = [

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- "bitflags 1.3.2",
+ "bitflags",
 "libc",
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@@ -1583,9 +1566,9 @@ checksum = "09edd9e8b54e49e587e4f6295a7d29c3ea94d469cb40ab8ca70b288248a81db2"

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 [[package]]
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 [[package]]
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 [[package]]
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@@ -1706,11 +1689,11 @@ dependencies = [

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 dependencies = [
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+ "bitflags",
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 "cfg_aliases",
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@@ -1733,7 +1716,7 @@ version = "8.2.0"
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 dependencies = [
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+ "bitflags",
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 "inotify",
 "kqueue",
@@ -1751,7 +1734,7 @@ version = "2.1.0"
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 dependencies = [
- "bitflags 2.11.1",
+ "bitflags",
 ]

 [[package]]
@@ -1775,9 +1758,9 @@ dependencies = [

 [[package]]
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+checksum = "521739c6d2bac4aa25192232afe6841231376b2b26d4d9fae5ecf8ca5772e441"

 [[package]]
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@@ -1875,18 +1858,18 @@ checksum = "9b4f627cb1b25917193a259e49bdad08f671f8d9708acfd5fe0a8c1455d87220"

 [[package]]
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+checksum = "2466b2336ed02bcdca6b294417127b90ec92038d1d5c4fbeac971a922e0e0924"
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 [[package]]
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 dependencies = [
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@@ -2017,7 +2000,7 @@ checksum = "4b45fcc2344c680f5025fe57779faef368840d0bd1f42f216291f0dc4ace4744"
 dependencies = [
 "bit-set",
 "bit-vec",
- "bitflags 2.11.1",
+ "bitflags",
 "num-traits",
 "rand 0.9.4",
 "rand_chacha",
@@ -2048,7 +2031,7 @@ dependencies = [
 "rustc-hash",
 "rustls",
 "socket2",
- "thiserror 2.0.18",
+ "thiserror",
 "tokio",
 "tracing",
 "web-time",
@@ -2070,7 +2053,7 @@ dependencies = [
 "rustls",
 "rustls-pki-types",
 "slab",
- "thiserror 2.0.18",
+ "thiserror",
 "tinyvec",
 "tracing",
 "web-time",
@@ -2201,7 +2184,7 @@ version = "0.5.18"
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 checksum = "ed2bf2547551a7053d6fdfafda3f938979645c44812fbfcda098faae3f1a362d"
 dependencies = [
- "bitflags 2.11.1",
+ "bitflags",
 ]

 [[package]]
@@ -2235,9 +2218,9 @@ checksum = "dc897dd8d9e8bd1ed8cdad82b5966c3e0ecae09fb1907d58efaa013543185d0a"

 [[package]]
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+checksum = "219c5811de6525e5416c7d5d53bb656d3afdbc6c5af816e0802bcfa42dbdc1c3"
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@@ -2331,7 +2314,7 @@ version = "1.1.4"
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 checksum = "b6fe4565b9518b83ef4f91bb47ce29620ca828bd32cb7e408f0062e9930ba190"
 dependencies = [
- "bitflags 2.11.1",
+ "bitflags",
 "errno",
 "libc",
 "linux-raw-sys",
@@ -2340,9 +2323,9 @@ dependencies = [

 [[package]]
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+version = "0.23.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "69f9466fb2c14ea04357e91413efb882e2a6d4a406e625449bc0a5d360d53a21"
+checksum = "ef86cd5876211988985292b91c96a8f2d298df24e75989a43a3c73f2d4d8168b"
 dependencies = [
 "aws-lc-rs",
 "once_cell",
@@ -2367,9 +2350,9 @@ dependencies = [

 [[package]]
 name = "rustls-pki-types"
-version = "1.14.0"
+version = "1.14.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be040f8b0a225e40375822a563fa9524378b9d63112f53e19ffff34df5d33fdd"
+checksum = "30a7197ae7eb376e574fe940d068c30fe0462554a3ddbe4eca7838e049c937a9"
 dependencies = [
 "web-time",
 "zeroize",
@@ -2377,9 +2360,9 @@ dependencies = [

 [[package]]
 name = "rustls-platform-verifier"
-version = "0.6.2"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1d99feebc72bae7ab76ba994bb5e121b8d83d910ca40b36e0921f53becc41784"
+checksum = "26d1e2536ce4f35f4846aa13bff16bd0ff40157cdb14cc056c7b14ba41233ba0"
 dependencies = [
 "core-foundation",
 "core-foundation-sys",
@@ -2479,7 +2462,7 @@ version = "3.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7f4bc775c73d9a02cde8bf7b2ec4c9d12743edf609006c7facc23998404cd1d"
 dependencies = [
- "bitflags 2.11.1",
+ "bitflags",
 "core-foundation",
 "core-foundation-sys",
 "libc",
@@ -2544,9 +2527,9 @@ dependencies = [

 [[package]]
 name = "serde_json"
-version = "1.0.149"
+version = "1.0.150"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83fc039473c5595ace860d8c4fafa220ff474b3fc6bfdb4293327f1a37e94d86"
+checksum = "e8014e44b4736ed0538adeecded0fce2a272f22dc9578a7eb6b2d9993c74cfb9"
 dependencies = [
 "itoa",
 "memchr",
@@ -2629,7 +2612,7 @@ dependencies = [
 "shadowsocks-crypto",
 "socket2",
 "spin",
- "thiserror 2.0.18",
+ "thiserror",
 "tokio",
 "tokio-tfo",
 "trait-variant",
@@ -2667,9 +2650,9 @@ dependencies = [

 [[package]]
 name = "shlex"
-version = "1.3.0"
+version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
+checksum = "f8fadd59c855ef2080decdef8ff161eb6661b86933c9d82e5ba29dc602a55aba"

 [[package]]
 name = "signal-hook-registry"
@@ -2687,6 +2670,22 @@ version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "77549399552de45a898a580c1b41d445bf730df867cc44e6c0233bbc4b8329de"

+[[package]]
+name = "simd_cesu8"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94f90157bb87cddf702797c5dadfa0be7d266cdf49e22da2fcaa32eff75b2c33"
+dependencies = [
+ "rustc_version",
+ "simdutf8",
+]
+
+[[package]]
+name = "simdutf8"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3a9fe34e3e7a50316060351f37187a3f546bce95496156754b601a5fa71b76e"
+
 [[package]]
 name = "slab"
 version = "0.4.12"
@@ -2701,9 +2700,9 @@ checksum = "67b1b7a3b5fe4f1376887184045fcf45c69e92af734b7aaddc05fb777b6fbd03"

 [[package]]
 name = "socket2"
-version = "0.6.3"
+version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3a766e1110788c36f4fa1c2b71b387a7815aa65f88ce0229841826633d93723e"
+checksum = "52d1cfed4120b4d927bf7c0f86d2087a4a7d6027c906d9f9d525a80573b9be51"
 dependencies = [
 "libc",
 "windows-sys 0.61.2",
@@ -2791,7 +2790,7 @@ checksum = "7b2093cf4c8eb1e67749a6762251bc9cd836b6fc171623bd0a9d324d37af2417"

 [[package]]
 name = "telemt"
-version = "3.4.11"
+version = "3.4.15"
 dependencies = [
 "aes",
 "anyhow",
@@ -2835,7 +2834,7 @@ dependencies = [
 "socket2",
 "static_assertions",
 "subtle",
- "thiserror 2.0.18",
+ "thiserror",
 "tokio",
 "tokio-rustls",
 "tokio-test",
@@ -2864,33 +2863,13 @@ dependencies = [
 "windows-sys 0.61.2",
 ]

-[[package]]
-name = "thiserror"
-version = "1.0.69"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b6aaf5339b578ea85b50e080feb250a3e8ae8cfcdff9a461c9ec2904bc923f52"
-dependencies = [
- "thiserror-impl 1.0.69",
-]
-
 [[package]]
 name = "thiserror"
 version = "2.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4288b5bcbc7920c07a1149a35cf9590a2aa808e0bc1eafaade0b80947865fbc4"
 dependencies = [
- "thiserror-impl 2.0.18",
-]
-
-[[package]]
-name = "thiserror-impl"
-version = "1.0.69"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
+ "thiserror-impl",
 ]

 [[package]]
@@ -2981,9 +2960,9 @@ checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"

 [[package]]
 name = "tokio"
-version = "1.52.1"
+version = "1.52.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b67dee974fe86fd92cc45b7a95fdd2f99a36a6d7b0d431a231178d3d670bbcc6"
+checksum = "8fc7f01b389ac15039e4dc9531aa973a135d7a4135281b12d7c1bc79fd57fffe"
 dependencies = [
 "bytes",
 "libc",
@@ -3130,20 +3109,20 @@ dependencies = [

 [[package]]
 name = "tower-http"
-version = "0.6.8"
+version = "0.6.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d4e6559d53cc268e5031cd8429d05415bc4cb4aefc4aa5d6cc35fbf5b924a1f8"
+checksum = "4cfcf7e2740e6fc6d4d688b4ef00650406bb94adf4731e43c096c3a19fe40840"
 dependencies = [
- "bitflags 2.11.1",
+ "bitflags",
 "bytes",
 "futures-util",
 "http",
 "http-body",
- "iri-string",
 "pin-project-lite",
 "tower",
 "tower-layer",
 "tower-service",
+ "url",
 ]

 [[package]]
@@ -3177,7 +3156,7 @@ checksum = "050686193eb999b4bb3bc2acfa891a13da00f79734704c4b8b4ef1a10b368a3c"
 dependencies = [
 "crossbeam-channel",
 "symlink",
- "thiserror 2.0.18",
+ "thiserror",
 "time",
 "tracing-subscriber",
 ]
@@ -3384,9 +3363,9 @@ dependencies = [

 [[package]]
 name = "wasm-bindgen"
-version = "0.2.118"
+version = "0.2.122"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0bf938a0bacb0469e83c1e148908bd7d5a6010354cf4fb73279b7447422e3a89"
+checksum = "3ed04576f974d2b2fba0f38c51dbc5518011e38c36bf1143164be765528fd409"
 dependencies = [
 "cfg-if",
 "once_cell",
@@ -3397,9 +3376,9 @@ dependencies = [

 [[package]]
 name = "wasm-bindgen-futures"
-version = "0.4.68"
+version = "0.4.72"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f371d383f2fb139252e0bfac3b81b265689bf45b6874af544ffa4c975ac1ebf8"
+checksum = "9473dbd2991ae90b6291c3c32c30c6187ac49aa32f9905d1cce280ec1e110b0f"
 dependencies = [
 "js-sys",
 "wasm-bindgen",
@@ -3407,9 +3386,9 @@ dependencies = [

 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.118"
+version = "0.2.122"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eeff24f84126c0ec2db7a449f0c2ec963c6a49efe0698c4242929da037ca28ed"
+checksum = "916151b09da36bd82f6615cbf3a419e2f0ba23a03c6160e8e92eb6bd4aa1dec6"
 dependencies = [
 "quote",
 "wasm-bindgen-macro-support",
@@ -3417,9 +3396,9 @@ dependencies = [

 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.118"
+version = "0.2.122"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d08065faf983b2b80a79fd87d8254c409281cf7de75fc4b773019824196c904"
+checksum = "299047362ccbfce148b67ab7e73349f77748e00c8296f9542adfad2ad82c5c5e"
 dependencies = [
 "bumpalo",
 "proc-macro2",
@@ -3430,9 +3409,9 @@ dependencies = [

 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.118"
+version = "0.2.122"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fd04d9e306f1907bd13c6361b5c6bfc7b3b3c095ed3f8a9246390f8dbdee129"
+checksum = "9a929b2c61f11ba3e9bc35b50c1f25cb38e0e892c0c231ae2b8cf78d5dad4437"
 dependencies = [
 "unicode-ident",
 ]
@@ -3465,7 +3444,7 @@ version = "0.244.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "47b807c72e1bac69382b3a6fb3dbe8ea4c0ed87ff5629b8685ae6b9a611028fe"
 dependencies = [
- "bitflags 2.11.1",
+ "bitflags",
 "hashbrown 0.15.5",
 "indexmap",
 "semver",
@@ -3473,9 +3452,9 @@ dependencies = [

 [[package]]
 name = "web-sys"
-version = "0.3.95"
+version = "0.3.99"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4f2dfbb17949fa2088e5d39408c48368947b86f7834484e87b73de55bc14d97d"
+checksum = "6d621441cfc37b84979402712047321980c178f299193a3589d05b99e8763436"
 dependencies = [
 "js-sys",
 "wasm-bindgen",
@@ -3616,15 +3595,6 @@ dependencies = [
 "windows-link",
 ]

-[[package]]
-name = "windows-sys"
-version = "0.45.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "75283be5efb2831d37ea142365f009c02ec203cd29a3ebecbc093d52315b66d0"
-dependencies = [
- "windows-targets 0.42.2",
-]
-
 [[package]]
 name = "windows-sys"
 version = "0.52.0"
@@ -3652,21 +3622,6 @@ dependencies = [
 "windows-link",
 ]

-[[package]]
-name = "windows-targets"
-version = "0.42.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e5180c00cd44c9b1c88adb3693291f1cd93605ded80c250a75d472756b4d071"
-dependencies = [
- "windows_aarch64_gnullvm 0.42.2",
- "windows_aarch64_msvc 0.42.2",
- "windows_i686_gnu 0.42.2",
- "windows_i686_msvc 0.42.2",
- "windows_x86_64_gnu 0.42.2",
- "windows_x86_64_gnullvm 0.42.2",
- "windows_x86_64_msvc 0.42.2",
-]
-
 [[package]]
 name = "windows-targets"
 version = "0.52.6"
@@ -3700,12 +3655,6 @@ dependencies = [
 "windows_x86_64_msvc 0.53.1",
 ]

-[[package]]
-name = "windows_aarch64_gnullvm"
-version = "0.42.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "597a5118570b68bc08d8d59125332c54f1ba9d9adeedeef5b99b02ba2b0698f8"
-
 [[package]]
 name = "windows_aarch64_gnullvm"
 version = "0.52.6"
@@ -3718,12 +3667,6 @@ version = "0.53.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a9d8416fa8b42f5c947f8482c43e7d89e73a173cead56d044f6a56104a6d1b53"

-[[package]]
-name = "windows_aarch64_msvc"
-version = "0.42.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
-
 [[package]]
 name = "windows_aarch64_msvc"
 version = "0.52.6"
@@ -3736,12 +3679,6 @@ version = "0.53.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b9d782e804c2f632e395708e99a94275910eb9100b2114651e04744e9b125006"

-[[package]]
-name = "windows_i686_gnu"
-version = "0.42.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
-
 [[package]]
 name = "windows_i686_gnu"
 version = "0.52.6"
@@ -3766,12 +3703,6 @@ version = "0.53.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fa7359d10048f68ab8b09fa71c3daccfb0e9b559aed648a8f95469c27057180c"

-[[package]]
-name = "windows_i686_msvc"
-version = "0.42.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
-
 [[package]]
 name = "windows_i686_msvc"
 version = "0.52.6"
@@ -3784,12 +3715,6 @@ version = "0.53.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1e7ac75179f18232fe9c285163565a57ef8d3c89254a30685b57d83a38d326c2"

-[[package]]
-name = "windows_x86_64_gnu"
-version = "0.42.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
-
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.52.6"
@@ -3802,12 +3727,6 @@ version = "0.53.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c3842cdd74a865a8066ab39c8a7a473c0778a3f29370b5fd6b4b9aa7df4a499"

-[[package]]
-name = "windows_x86_64_gnullvm"
-version = "0.42.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
-
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.52.6"
@@ -3820,12 +3739,6 @@ version = "0.53.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ffa179e2d07eee8ad8f57493436566c7cc30ac536a3379fdf008f47f6bb7ae1"

-[[package]]
-name = "windows_x86_64_msvc"
-version = "0.42.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
-
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.52.6"
@@ -3840,9 +3753,9 @@ checksum = "d6bbff5f0aada427a1e5a6da5f1f98158182f26556f345ac9e04d36d0ebed650"

 [[package]]
 name = "winnow"
-version = "1.0.1"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "09dac053f1cd375980747450bfc7250c264eaae0583872e845c0c7cd578872b5"
+checksum = "0592e1c9d151f854e6fd382574c3a0855250e1d9b2f99d9281c6e6391af352f1"

 [[package]]
 name = "wit-bindgen"
@@ -3908,7 +3821,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9d66ea20e9553b30172b5e831994e35fbde2d165325bec84fc43dbf6f4eb9cb2"
 dependencies = [
 "anyhow",
- "bitflags 2.11.1",
+ "bitflags",
 "indexmap",
 "log",
 "serde",
@@ -3969,7 +3882,7 @@ dependencies = [
 "nom",
 "oid-registry",
 "rusticata-macros",
- "thiserror 2.0.18",
+ "thiserror",
 "time",
 ]

@@ -3998,18 +3911,18 @@ dependencies = [

 [[package]]
 name = "zerocopy"
-version = "0.8.48"
+version = "0.8.49"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eed437bf9d6692032087e337407a86f04cd8d6a16a37199ed57949d415bd68e9"
+checksum = "bce33a6288fa3f072a8c2c7d0f2fdbb90e28298f0135c1f99b96c3db2efcc60b"
 dependencies = [
 "zerocopy-derive",
 ]

 [[package]]
 name = "zerocopy-derive"
-version = "0.8.48"
+version = "0.8.49"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "70e3cd084b1788766f53af483dd21f93881ff30d7320490ec3ef7526d203bad4"
+checksum = "8fd425244944f4ab65ccff928e7323354c5a018c75838362fdce749dfad2ee1e"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -4018,9 +3931,9 @@ dependencies = [

 [[package]]
 name = "zerofrom"
-version = "0.1.7"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "69faa1f2a1ea75661980b013019ed6687ed0e83d069bc1114e2cc74c6c04c4df"
+checksum = "0ec05a11813ea801ff6d75110ad09cd0824ddba17dfe17128ea0d5f68e6c5272"
 dependencies = [
 "zerofrom-derive",
 ]
@@ -1,6 +1,6 @@
 [package]
 name = "telemt"
-version = "3.4.11"
+version = "3.4.15"
 edition = "2024"

 [features]
@@ -4,13 +4,13 @@

 [🇷🇺 README на русском](https://github.com/telemt/telemt/blob/main/README.ru.md)

-***Löst Probleme, bevor andere überhaupt wissen, dass sie existieren*** / ***It solves problems before others even realize they exist***
-
 > [!NOTE]
 >
-> Fixed TLS ClientHello is now available in official clients for Desktop / Android / iOS
+> From June 5th, 2026: we are already analyzing the causes of a new wave of "malfunctions"
 > 
-> To work with EE-MTProxy, please update your client!
+> Telegram Clients TLS ClientHello has been banned by JA3 Fingerprint: we are already looking for ways to solve this problem
+>
+> You can try build your client with our Telegram Devlibrary - [tdlib-obf](https://github.com/telemt/tdlib-obf)

 <p align="center">
  <a href="https://t.me/telemtrs">
@@ -1,57 +1,52 @@
 # Telemt — MTProxy на Rust + Tokio

-[![Latest Release](https://img.shields.io/github/v/release/telemt/telemt?color=neon)](https://github.com/telemt/telemt/releases/latest) [![Stars](https://img.shields.io/github/stars/telemt/telemt?style=social)](https://github.com/telemt/telemt/stargazers) [![Forks](https://img.shields.io/github/forks/telemt/telemt?style=social)](https://github.com/telemt/telemt/network/members) [![Telegram](https://img.shields.io/badge/Telegram-Chat-24a1de?logo=telegram&logoColor=24a1de)](https://t.me/telemtrs)
-
-***Решает проблемы раньше, чем другие узнают об их существовании***
+[![Latest Release](https://img.shields.io/github/v/release/telemt/telemt?color=neon)](https://github.com/telemt/telemt/releases/latest) [![Stars](https://img.shields.io/github/stars/telemt/telemt?style=social)](https://github.com/telemt/telemt/stargazers) [![Forks](https://img.shields.io/github/forks/telemt/telemt?style=social)](https://github.com/telemt/telemt/network/members)

 > [!NOTE]
 >
-> Исправленный TLS ClientHello доступен в Telegram для настольных ПК, Android и iOS.
+> Клиенты Telegram подвергаются блокировке по JA3-отпечатку; мы ищем варианты решения этой проблемы
 > 
-> Пожалуйста, обновите клиентское приложение для работы с EE-MTProxy.
+> Вы можете попробовать собрать свой клиент с нашей Telegram Devlibrary — [tdlib-obf](https://github.com/telemt/tdlib-obf)

 <p align="center">
  <a href="https://t.me/telemtrs">
-    <img src="/docs/assets/telegram_button.svg" width="150"/>
+    <img src="https://github.com/user-attachments/assets/30b7e7b9-974a-4e3d-aab6-b58a85de4507" width="240"/>
  </a>
 </p>

-**Telemt** — это быстрый, безопасный и функциональный сервер, написанный на Rust. Он полностью реализует официальный алгоритм прокси Telegram и добавляет множество улучшений для продакшена:
+**Telemt** — это быстрый, безопасный и функциональный сервер, написанный на Rust: он полностью реализует официальный алгоритм Telegram прокси и добавляет множество различных улучшений

 ## Установка и обновление одной командой

 ```bash
 curl -fsSL https://raw.githubusercontent.com/telemt/telemt/main/install.sh | sh
 ```
-
 - [Инструкция по быстрому запуску](docs/Quick_start/QUICK_START_GUIDE.ru.md)
- [Quick Start Guide](docs/Quick_start/QUICK_START_GUIDE.en.md)

-Реализация **TLS-fronting** максимально приближена к поведению реального HTTPS-трафика (подробнее - [FAQ](docs/FAQ.ru.md#распознаваемость-для-dpi-и-сканеров)).
+## Функционал
+Наша реализация **TLS-fronting** одна из наиболее глубоко отлаженных, продвинутых и почти поведенчески неотличима от настоящего: мы уверены, что сделали это правильно - [см. доказательства в нашей проверке](docs/FAQ.ru.md#распознаваемость-для-dpi-и-сканеров).

-***Middle-End Pool*** оптимизирован для высокой производительности.
+Наша архитектура ***Middle-End Pool*** в стандартных сценариях самая производительная, по сравнению с другими реализациями подключения к Middle-End прокси: не кардинально, но достаточно

- Поддержка всех режимов MTProto proxy:
+- Полная поддержа всех официальных режимов MTProto proxy:
  - Classic;
-  - Secure (префикс `dd`);
-  - Fake TLS (префикс `ee` + SNI fronting);
+  - Secure — с префиксом `dd`;
+  - Fake TLS — с префиксом `ee` + SNI fronting;
 - Защита от replay-атак;
- Маскировка трафика (перенаправление неизвестных подключений на реальные сайты);
- Настраиваемые keepalive, таймауты, IPv6 и «быстрый режим»;
+- Опциональная маскировка трафика: перенаправление неизвестных подключений на реальные сайты;
+- Настраиваемые keepalive, таймауты, IPv6 и "быстрый режим";
 - Корректное завершение работы (Ctrl+C);
- Подробное логирование через `trace` и `debug`.
+- Подробное логирование через `trace` и `debug` с помощью `RUST_LOG`.

-# Подробнее о Telemt
- [FAQ](#faq)
- [Архитектура](docs/Architecture)
- [Параметры конфигурационного файла](docs/Config_params)
- [Сборка](#build)
- [Установка на BSD](#%D1%83%D1%81%D1%82%D0%B0%D0%BD%D0%BE%D0%B2%D0%BA%D0%B0-%D0%BD%D0%B0-bsd)
- [Почему Rust?](#why-rust)
+## ЧаВо
+- [Часто задаваемые вопросы](docs/FAQ.ru.md)

-## FAQ
- [FAQ RU](docs/FAQ.ru.md)
- [FAQ EN](docs/FAQ.en.md)
+# Узнайте больше о Telemt
+- [Наша архитектура](docs/Architecture)
+- [Все конфигурационные параметры](docs/Config_params)
+- [Как собрать Telemt самостоятельно?](#сборка)
+- [Установка на BSD](docs/Quick_start/OPENBSD_QUICK_START_GUIDE.en.md)
+- [Почему Rust?](#почему-rust)

 ## Сборка
 ```bash
@@ -63,7 +58,7 @@ cd telemt
 cargo build --release

 # В текущем release-профиле используется lto = "fat" для максимальной оптимизации (см. Cargo.toml).
-# На системах с малым объёмом RAM (~1 ГБ) можно переопределить это значение на "thin".
+# На системах с малым объёмом ОЗУ (~1 ГБ) можно переопределить это значение на "thin".

 # Перейдите в каталог /bin
 mv ./target/release/telemt /bin
@@ -73,24 +68,19 @@ chmod +x /bin/telemt
 telemt config.toml
 ```

-## Установка на BSD
- Руководство по сборке и настройке на английском языке [OpenBSD Guide (EN)](docs/Quick_start/OPENBSD_QUICK_START_GUIDE.en.md);
- Пример rc.d скрипта: [contrib/openbsd/telemt.rcd](contrib/openbsd/telemt.rcd);
- Поддержка sandbox с `pledge(2)` и `unveil(2)` пока не реализована.
-
 ## Почему Rust?
- Надёжность для долгоживущих процессов;
- Детерминированное управление ресурсами (RAII);
+- Надёжность при длительной работе и идемпотентное поведение;
+- Детерминированное управление ресурсами — RAII;
 - Отсутствие сборщика мусора;
- Безопасность памяти;
+- Безопасность памяти и меньше поверхность атаки;
 - Асинхронная архитектура Tokio.

 ## Поддержать Telemt

-Telemt — это бесплатное программное обеспечение с открытым исходным кодом, разработанное в свободное время.
+Telemt — это бесплатное программное обеспечение с открытым исходным кодом, разрабатываемое в свободное время.
 Если оно оказалось вам полезным, вы можете поддержать дальнейшую разработку.

-Принимаемые криптовалюты (BTC, ETH, USDT, 350+ и другие):
+Любая криптовалюта (BTC, ETH, USDT и 350+ других):

 <p align="center">
  <a href="https://nowpayments.io/donation?api_key=2bf1afd2-abc2-49f9-a012-f1e715b37223" target="_blank" rel="noreferrer noopener">
@@ -10,12 +10,15 @@ services:
      - "443:443"
      - "127.0.0.1:9090:9090"
      - "127.0.0.1:9091:9091"
-    # Allow caching 'proxy-secret' in read-only container
-    working_dir: /etc/telemt
+    # Working dir uses tmpfs for caching 'proxy-secret' at runtime.
+    # Config is mounted as a directory (not a single file) so the API can
+    # atomically update config.toml via write-temp → rename within the same FS.
+    working_dir: /run/telemt
+    command: ["/etc/telemt/config.toml"]
    volumes:
-      - ./config.toml:/etc/telemt/config.toml:ro
+      - ./config:/etc/telemt:rw
    tmpfs:
-      - /etc/telemt:rw,mode=1777,size=4m
+      - /run/telemt:rw,mode=1777,size=4m
    environment:
      - RUST_LOG=info
    healthcheck:
@@ -24,8 +27,6 @@ services:
      timeout: 5s
      retries: 3
      start_period: 20s
-    # Uncomment this line if you want to use host network for IPv6, but bridge is default and usually better
-    # network_mode: host
    cap_drop:
      - ALL
    cap_add:
@@ -37,3 +38,8 @@ services:
      nofile:
        soft: 65536
        hard: 262144
+    logging:
+      driver: json-file
+      options:
+        max-size: "50m"
+        max-file: "5"
@@ -86,6 +86,9 @@ Die unten angegebenen `Default`-Werte sind Code-Defaults (bei fehlendem Schlüss
 | `[[upstreams]].weight` | alle Upstreams | `u16` | nein | `1` | Basisgewicht für weighted-random Auswahl. |
 | `[[upstreams]].enabled` | alle Upstreams | `bool` | nein | `true` | Deaktivierte Einträge werden beim Start ignoriert. |
 | `[[upstreams]].scopes` | alle Upstreams | `String` | nein | `""` | Komma-separierte Scope-Tags für Request-Routing. |
+| `[[upstreams]].ipv4` | alle Upstreams | `Option<bool>` | nein | `auto` | Erlaubt IPv4-DC-Ziele für diesen Upstream. |
+| `[[upstreams]].ipv6` | alle Upstreams | `Option<bool>` | nein | `auto` | Erlaubt IPv6-DC-Ziele für diesen Upstream, inklusive Proxy-Egress unabhängig vom Host-IPv6. |
+| `[[upstreams]].prefer` | alle Upstreams | `Option<4 \| 6>` | nein | effective `[network].prefer` | Pro-Upstream-Präferenz für die DC-Ziel-Adressfamilie. |
 | `interface` | `direct` | `Option<String>` | nein | `null` | Interface-Name (z. B. `eth0`) oder lokale Literal-IP. |
 | `bind_addresses` | `direct` | `Option<Vec<IpAddr>>` | nein | `null` | Explizite Source-IP-Kandidaten (strikter Vorrang vor `interface`). |
 | `address` | `socks4` | `String` | ja | n/a | SOCKS4-Server (`ip:port` oder `host:port`). |
@@ -86,6 +86,9 @@ Defaults below are code defaults (used when a key is omitted), not necessarily v
 | `[[upstreams]].weight` | all upstreams | `u16` | no | `1` | Base weight for weighted-random selection. |
 | `[[upstreams]].enabled` | all upstreams | `bool` | no | `true` | Disabled entries are ignored at startup. |
 | `[[upstreams]].scopes` | all upstreams | `String` | no | `""` | Comma-separated scope tags for request-level routing. |
+| `[[upstreams]].ipv4` | all upstreams | `Option<bool>` | no | `auto` | Allow IPv4 DC targets for this upstream. |
+| `[[upstreams]].ipv6` | all upstreams | `Option<bool>` | no | `auto` | Allow IPv6 DC targets for this upstream, including proxy egress independent of host IPv6. |
+| `[[upstreams]].prefer` | all upstreams | `Option<4 \| 6>` | no | effective `[network].prefer` | Per-upstream DC target family preference. |
 | `interface` | `direct` | `Option<String>` | no | `null` | Interface name (e.g. `eth0`) or literal local IP for bind selection. |
 | `bind_addresses` | `direct` | `Option<Vec<IpAddr>>` | no | `null` | Explicit local source IP candidates (strict priority over `interface`). |
 | `address` | `socks4` | `String` | yes | n/a | SOCKS4 server endpoint (`ip:port` or `host:port`). |
@@ -86,6 +86,9 @@
 | `[[upstreams]].weight` | все upstream | `u16` | нет | `1` | Базовый вес в weighted-random выборе. |
 | `[[upstreams]].enabled` | все upstream | `bool` | нет | `true` | Выключенные записи игнорируются на старте. |
 | `[[upstreams]].scopes` | все upstream | `String` | нет | `""` | Список scope-токенов через запятую для маршрутизации. |
+| `[[upstreams]].ipv4` | все upstream | `Option<bool>` | нет | `auto` | Разрешает IPv4 DC-targets для этого upstream. |
+| `[[upstreams]].ipv6` | все upstream | `Option<bool>` | нет | `auto` | Разрешает IPv6 DC-targets для этого upstream, включая proxy egress независимо от IPv6 на хосте. |
+| `[[upstreams]].prefer` | все upstream | `Option<4 \| 6>` | нет | эффективный `[network].prefer` | Предпочтительное семейство DC-target для конкретного upstream. |
 | `interface` | `direct` | `Option<String>` | нет | `null` | Имя интерфейса (например `eth0`) или literal локальный IP. |
 | `bind_addresses` | `direct` | `Option<Vec<IpAddr>>` | нет | `null` | Явные кандидаты source IP (имеют приоритет над `interface`). |
 | `address` | `socks4` | `String` | да | n/a | Адрес SOCKS4 сервера (`ip:port` или `host:port`). |
@@ -13,7 +13,7 @@ API runtime is configured in `[server.api]`.
 | `listen` | `string` (`IP:PORT`) | `0.0.0.0:9091` | API bind address. |
 | `whitelist` | `CIDR[]` | `127.0.0.0/8` | Source IP allowlist. Empty list means allow all. |
 | `auth_header` | `string` | `""` | Exact value for `Authorization` header. Empty disables header auth. |
-| `request_body_limit_bytes` | `usize` | `65536` | Maximum request body size. Must be `> 0`. |
+| `request_body_limit_bytes` | `usize` | `65536` | Maximum request body size. Must be within `[1, 1048576]`. |
 | `minimal_runtime_enabled` | `bool` | `true` | Enables runtime snapshot endpoints requiring ME pool read-lock aggregation. |
 | `minimal_runtime_cache_ttl_ms` | `u64` | `1000` | Cache TTL for minimal snapshots. `0` disables cache; valid range is `[0, 60000]`. |
 | `runtime_edge_enabled` | `bool` | `false` | Enables runtime edge endpoints with cached aggregation payloads. |
@@ -26,7 +26,7 @@ API runtime is configured in `[server.api]`.

 Runtime validation for API config:
 - `server.api.listen` must be a valid `IP:PORT`.
- `server.api.request_body_limit_bytes` must be `> 0`.
+- `server.api.request_body_limit_bytes` must be within `[1, 1048576]`.
 - `server.api.minimal_runtime_cache_ttl_ms` must be within `[0, 60000]`.
 - `server.api.runtime_edge_cache_ttl_ms` must be within `[0, 60000]`.
 - `server.api.runtime_edge_top_n` must be within `[1, 1000]`.
@@ -76,13 +76,14 @@ Requests are processed in this order:

 Notes:
 - Whitelist is evaluated against the direct TCP peer IP (`SocketAddr::ip`), without `X-Forwarded-For` support.
- `Authorization` check is exact string equality against configured `auth_header`.
+- `Authorization` check is exact constant-time byte equality against configured `auth_header`.

 ## Endpoint Matrix

 | Method | Path | Body | Success | `data` contract |
 | --- | --- | --- | --- | --- |
 | `GET` | `/v1/health` | none | `200` | `HealthData` |
+| `GET` | `/v1/health/ready` | none | `200` or `503` | `HealthReadyData` |
 | `GET` | `/v1/system/info` | none | `200` | `SystemInfoData` |
 | `GET` | `/v1/runtime/gates` | none | `200` | `RuntimeGatesData` |
 | `GET` | `/v1/runtime/initialization` | none | `200` | `RuntimeInitializationData` |
@@ -102,13 +103,55 @@ Notes:
 | `GET` | `/v1/runtime/me-selftest` | none | `200` | `RuntimeMeSelftestData` |
 | `GET` | `/v1/runtime/connections/summary` | none | `200` | `RuntimeEdgeConnectionsSummaryData` |
 | `GET` | `/v1/runtime/events/recent` | none | `200` | `RuntimeEdgeEventsData` |
+| `GET` | `/v1/runtime/tls-fingerprints` | optional `limit=1..1000` | `200` | `RuntimeEdgeTlsFingerprintsData` |
+| `GET` | `/v1/stats/users/active-ips` | none | `200` | `UserActiveIps[]` |
 | `GET` | `/v1/stats/users` | none | `200` | `UserInfo[]` |
 | `GET` | `/v1/users` | none | `200` | `UserInfo[]` |
-| `POST` | `/v1/users` | `CreateUserRequest` | `201` | `CreateUserResponse` |
+| `POST` | `/v1/users` | `CreateUserRequest` | `201` or `202` | `CreateUserResponse` |
 | `GET` | `/v1/users/{username}` | none | `200` | `UserInfo` |
-| `PATCH` | `/v1/users/{username}` | `PatchUserRequest` | `200` | `UserInfo` |
-| `DELETE` | `/v1/users/{username}` | none | `200` | `string` (deleted username) |
-| `POST` | `/v1/users/{username}/rotate-secret` | `RotateSecretRequest` or empty body | `404` | `ErrorResponse` (`not_found`, current runtime behavior) |
+| `PATCH` | `/v1/users/{username}` | `PatchUserRequest` | `200` or `202` | `UserInfo` |
+| `DELETE` | `/v1/users/{username}` | none | `200` or `202` | `DeleteUserResponse` |
+| `POST` | `/v1/users/{username}/rotate-secret` | `RotateSecretRequest` or empty body | `200` or `202` | `CreateUserResponse` |
+| `POST` | `/v1/users/{username}/enable` | empty body | `200` or `202` | `UserInfo` |
+| `POST` | `/v1/users/{username}/disable` | empty body | `200` or `202` | `UserInfo` |
+| `POST` | `/v1/users/{username}/reset-quota` | empty body | `200` | `ResetUserQuotaResponse` |
+
+## Endpoint Behavior
+
+| Endpoint | Function |
+| --- | --- |
+| `GET /v1/health` | Returns basic API liveness and current `read_only` flag. |
+| `GET /v1/health/ready` | Returns readiness based on admission state and upstream health; returns `503` when not ready. |
+| `GET /v1/system/info` | Returns binary/build metadata, process uptime, config path/hash, and reload counters. |
+| `GET /v1/runtime/gates` | Returns admission, ME readiness, fallback/reroute, and startup gate state. |
+| `GET /v1/runtime/initialization` | Returns startup progress, ME initialization status, and per-component timeline. |
+| `GET /v1/limits/effective` | Returns effective timeout, upstream, ME, unique-IP, and TCP policy values after config defaults/resolution. |
+| `GET /v1/security/posture` | Returns current API/security/telemetry posture flags. |
+| `GET /v1/security/whitelist` | Returns configured API whitelist CIDRs. |
+| `GET /v1/stats/summary` | Returns compact core counters and classed failure counters. |
+| `GET /v1/stats/zero/all` | Returns zero-cost core, upstream, ME, pool, and desync counters. |
+| `GET /v1/stats/upstreams` | Returns upstream zero counters and, when enabled/available, runtime upstream health rows. |
+| `GET /v1/stats/minimal/all` | Returns cached minimal ME writer/DC/runtime/network-path snapshot. |
+| `GET /v1/stats/me-writers` | Returns cached ME writer coverage and per-writer status rows. |
+| `GET /v1/stats/dcs` | Returns cached per-DC endpoint/writer/load status rows. |
+| `GET /v1/runtime/me_pool_state` | Returns active/warm/pending/draining generation state, writer contour/health, and refill state. |
+| `GET /v1/runtime/me_quality` | Returns ME lifecycle counters, route-drop counters, family states, drain gate, and per-DC RTT/coverage. |
+| `GET /v1/runtime/upstream_quality` | Returns upstream policy/counters plus runtime upstream health rows when available. |
+| `GET /v1/runtime/nat_stun` | Returns NAT/STUN runtime flags, configured/live STUN servers, reflection cache, and backoff. |
+| `GET /v1/runtime/me-selftest` | Returns ME self-test state for KDF, time skew, IP family, PID, and SOCKS BND observations. |
+| `GET /v1/runtime/connections/summary` | Returns runtime-edge connection totals and top-N users by connections/throughput. |
+| `GET /v1/runtime/events/recent` | Returns recent API/runtime event records with optional `limit` query. |
+| `GET /v1/stats/users/active-ips` | Returns users that currently have non-empty active source-IP lists. |
+| `GET /v1/stats/users` | Alias of `GET /v1/users`; returns disk-first user views with runtime lag flag. |
+| `GET /v1/users` | Returns disk-first user views sorted by username. |
+| `POST /v1/users` | Creates a user and returns the effective user view plus secret. |
+| `GET /v1/users/{username}` | Returns one disk-first user view or `404` when absent. |
+| `PATCH /v1/users/{username}` | Updates selected per-user fields with JSON Merge Patch semantics. |
+| `DELETE /v1/users/{username}` | Deletes one user and related per-user access-map entries. |
+| `POST /v1/users/{username}/rotate-secret` | Rotates one user's secret and returns the effective secret. |
+| `POST /v1/users/{username}/enable` | Enables one user, removing any disabled override from config. |
+| `POST /v1/users/{username}/disable` | Disables one user and closes active runtime sessions for that user. |
+| `POST /v1/users/{username}/reset-quota` | Resets one user's runtime quota counter and persists quota state. |

 ## Common Error Codes

@@ -118,7 +161,7 @@ Notes:
 | `401` | `unauthorized` | Missing/invalid `Authorization` when `auth_header` is configured. |
 | `403` | `forbidden` | Source IP is not allowed by whitelist. |
 | `403` | `read_only` | Mutating endpoint called while `read_only=true`. |
-| `404` | `not_found` | Unknown route, unknown user, or unsupported sub-route (including current `rotate-secret` route). |
+| `404` | `not_found` | Unknown route, unknown user, or unsupported sub-route. |
 | `405` | `method_not_allowed` | Unsupported method for `/v1/users/{username}` route shape. |
 | `409` | `revision_conflict` | `If-Match` revision mismatch. |
 | `409` | `user_exists` | User already exists on create. |
@@ -132,11 +175,14 @@ Notes:
 | Case | Behavior |
 | --- | --- |
 | Path matching | Exact match on `req.uri().path()`. Query string does not affect route matching. |
-| Trailing slash | Not normalized. Example: `/v1/users/` is `404`. |
+| Trailing slash | Trimmed for route matching when path length is greater than 1. Example: `/v1/users/` matches `/v1/users`. |
 | Username route with extra slash | `/v1/users/{username}/...` is not treated as user route and returns `404`. |
 | `PUT /v1/users/{username}` | `405 method_not_allowed`. |
 | `POST /v1/users/{username}` | `404 not_found`. |
-| `POST /v1/users/{username}/rotate-secret` | `404 not_found` in current release due route matcher limitation. |
+| `POST /v1/users/{username}/rotate-secret/` | Trailing slash is trimmed and the route matches `rotate-secret`. |
+| `POST /v1/users/{username}/enable/` | Trailing slash is trimmed and the route matches `enable`. |
+| `POST /v1/users/{username}/disable/` | Trailing slash is trimmed and the route matches `disable`. |
+| `POST /v1/users/{username}/reset-quota/` | Trailing slash is trimmed and the route matches `reset-quota`. |

 ## Body and JSON Semantics

@@ -146,7 +192,7 @@ Notes:
 - Invalid JSON returns `400 bad_request` (`Invalid JSON body`).
 - `Content-Type` is not required for JSON parsing.
 - Unknown JSON fields are ignored by deserialization.
- `PATCH` updates only provided fields and does not support explicit clearing of optional fields.
+- `PATCH` uses JSON Merge Patch semantics for optional per-user fields: omitted means unchanged, explicit `null` removes the config entry, and a non-null value sets it.
 - `If-Match` supports both quoted and unquoted values; surrounding whitespace is trimmed.

 ## Query Parameters
@@ -166,17 +212,23 @@ Notes:
 | `max_tcp_conns` | `usize` | no | Per-user concurrent TCP limit. |
 | `expiration_rfc3339` | `string` | no | RFC3339 expiration timestamp. |
 | `data_quota_bytes` | `u64` | no | Per-user traffic quota. |
+| `rate_limit_up_bps` | `u64` | no | Per-user upload rate limit in bytes per second. |
+| `rate_limit_down_bps` | `u64` | no | Per-user download rate limit in bytes per second. |
 | `max_unique_ips` | `usize` | no | Per-user unique source IP limit. |
+| `enabled` | `bool` | no | User enable flag. Missing means enabled. `false` persists a disabled override. |

 ### `PatchUserRequest`
 | Field | Type | Required | Description |
 | --- | --- | --- | --- |
 | `secret` | `string` | no | Exactly 32 hex chars. |
-| `user_ad_tag` | `string` | no | Exactly 32 hex chars. |
-| `max_tcp_conns` | `usize` | no | Per-user concurrent TCP limit. |
-| `expiration_rfc3339` | `string` | no | RFC3339 expiration timestamp. |
-| `data_quota_bytes` | `u64` | no | Per-user traffic quota. |
-| `max_unique_ips` | `usize` | no | Per-user unique source IP limit. |
+| `user_ad_tag` | `string|null` | no | Exactly 32 hex chars; `null` removes the per-user ad tag. |
+| `max_tcp_conns` | `usize|null` | no | Per-user concurrent TCP limit; `null` removes the per-user override. |
+| `expiration_rfc3339` | `string|null` | no | RFC3339 expiration timestamp; `null` removes the expiration. |
+| `data_quota_bytes` | `u64|null` | no | Per-user traffic quota; `null` removes the per-user quota. |
+| `rate_limit_up_bps` | `u64|null` | no | Per-user upload rate limit in bytes per second; `null` removes the upload direction limit. |
+| `rate_limit_down_bps` | `u64|null` | no | Per-user download rate limit in bytes per second; `null` removes the download direction limit. |
+| `max_unique_ips` | `usize|null` | no | Per-user unique source IP limit; `null` removes the per-user override. |
+| `enabled` | `bool|null` | no | `false` disables the user. `true` or `null` removes the disabled override, so the user is enabled. |

 ### `access.user_source_deny` via API
 - In current API surface, per-user deny-list is **not** exposed as a dedicated field in `CreateUserRequest` / `PatchUserRequest`.
@@ -198,7 +250,7 @@ bob = ["198.51.100.42/32"]
 | --- | --- | --- | --- |
 | `secret` | `string` | no | Exactly 32 hex chars. If missing, generated automatically. |

-Note: the request contract is defined, but the corresponding route currently returns `404` (see routing edge cases).
+An empty request body is accepted and generates a new secret automatically.

 ## Response Data Contracts

@@ -208,15 +260,33 @@ Note: the request contract is defined, but the corresponding route currently ret
 | `status` | `string` | Always `"ok"`. |
 | `read_only` | `bool` | Mirrors current API `read_only` mode. |

+### `HealthReadyData`
+| Field | Type | Description |
+| --- | --- | --- |
+| `ready` | `bool` | `true` when admission is open and at least one upstream is healthy. |
+| `status` | `string` | `"ready"` or `"not_ready"`. |
+| `reason` | `string?` | `admission_closed` or `no_healthy_upstreams` when not ready. |
+| `admission_open` | `bool` | Current admission-gate state. |
+| `healthy_upstreams` | `usize` | Number of healthy upstream entries. |
+| `total_upstreams` | `usize` | Number of configured upstream entries. |
+
 ### `SummaryData`
 | Field | Type | Description |
 | --- | --- | --- |
 | `uptime_seconds` | `f64` | Process uptime in seconds. |
 | `connections_total` | `u64` | Total accepted client connections. |
 | `connections_bad_total` | `u64` | Failed/invalid client connections. |
+| `connections_bad_by_class` | `ClassCount[]` | Failed/invalid connections grouped by class. |
+| `handshake_failures_by_class` | `ClassCount[]` | Handshake failures grouped by class. |
 | `handshake_timeouts_total` | `u64` | Handshake timeout count. |
 | `configured_users` | `usize` | Number of configured users in config. |

+#### `ClassCount`
+| Field | Type | Description |
+| --- | --- | --- |
+| `class` | `string` | Failure class label. |
+| `total` | `u64` | Counter value for this class. |
+
 ### `SystemInfoData`
 | Field | Type | Description |
 | --- | --- | --- |
@@ -241,7 +311,12 @@ Note: the request contract is defined, but the corresponding route currently ret
 | `conditional_cast_enabled` | `bool` | Whether conditional ME admission logic is enabled (`general.use_middle_proxy`). |
 | `me_runtime_ready` | `bool` | Current ME runtime readiness status used for conditional gate decisions. |
 | `me2dc_fallback_enabled` | `bool` | Whether ME -> direct fallback is enabled. |
+| `me2dc_fast_enabled` | `bool` | Whether fast ME -> direct fallback is enabled. |
 | `use_middle_proxy` | `bool` | Current transport mode preference. |
+| `route_mode` | `string` | Current route mode label from route runtime controller. |
+| `reroute_active` | `bool` | `true` when ME fallback currently routes new sessions to Direct-DC. |
+| `reroute_to_direct_at_epoch_secs` | `u64?` | Unix timestamp when current direct reroute began. |
+| `reroute_reason` | `string?` | `startup_direct_fallback`, `fast_not_ready_fallback`, or `strict_grace_fallback` while reroute is active. |
 | `startup_status` | `string` | Startup status (`pending`, `initializing`, `ready`, `failed`, `skipped`). |
 | `startup_stage` | `string` | Current startup stage identifier. |
 | `startup_progress_pct` | `f64` | Startup progress percentage (`0..100`). |
@@ -292,11 +367,13 @@ Note: the request contract is defined, but the corresponding route currently ret
 | `upstream` | `EffectiveUpstreamLimits` | Effective upstream connect/retry limits. |
 | `middle_proxy` | `EffectiveMiddleProxyLimits` | Effective ME pool/floor/reconnect limits. |
 | `user_ip_policy` | `EffectiveUserIpPolicyLimits` | Effective unique-IP policy mode/window. |
+| `user_tcp_policy` | `EffectiveUserTcpPolicyLimits` | Effective per-user TCP connection policy. |

 #### `EffectiveTimeoutLimits`
 | Field | Type | Description |
 | --- | --- | --- |
 | `client_handshake_secs` | `u64` | Client handshake timeout. |
+| `client_first_byte_idle_secs` | `u64` | First-byte idle timeout before protocol classification. |
 | `tg_connect_secs` | `u64` | Upstream Telegram connect timeout. |
 | `client_keepalive_secs` | `u64` | Client keepalive interval. |
 | `client_ack_secs` | `u64` | ACK timeout. |
@@ -335,13 +412,20 @@ Note: the request contract is defined, but the corresponding route currently ret
 | `writer_pick_mode` | `string` | Writer picker mode (`sorted_rr`, `p2c`). |
 | `writer_pick_sample_size` | `u8` | Candidate sample size for `p2c` picker mode. |
 | `me2dc_fallback` | `bool` | Effective ME -> direct fallback flag. |
+| `me2dc_fast` | `bool` | Effective fast fallback flag. |

 #### `EffectiveUserIpPolicyLimits`
 | Field | Type | Description |
 | --- | --- | --- |
+| `global_each` | `usize` | Global per-user unique-IP limit applied when no per-user override exists. |
 | `mode` | `string` | Unique-IP policy mode (`active_window`, `time_window`, `combined`). |
 | `window_secs` | `u64` | Time window length used by unique-IP policy. |

+#### `EffectiveUserTcpPolicyLimits`
+| Field | Type | Description |
+| --- | --- | --- |
+| `global_each` | `usize` | Global per-user concurrent TCP limit applied when no per-user override exists. |
+
 ### `SecurityPostureData`
 | Field | Type | Description |
 | --- | --- | --- |
@@ -445,6 +529,8 @@ Note: the request contract is defined, but the corresponding route currently ret
 | --- | --- | --- |
 | `counters` | `RuntimeMeQualityCountersData` | Key ME lifecycle/error counters. |
 | `route_drops` | `RuntimeMeQualityRouteDropData` | Route drop counters by reason. |
+| `family_states` | `RuntimeMeQualityFamilyStateData[]` | Per-family ME route/recovery state rows. |
+| `drain_gate` | `RuntimeMeQualityDrainGateData` | Current ME drain-gate decision state. |
 | `dc_rtt` | `RuntimeMeQualityDcRttData[]` | Per-DC RTT and writer coverage rows. |

 #### `RuntimeMeQualityCountersData`
@@ -466,6 +552,24 @@ Note: the request contract is defined, but the corresponding route currently ret
 | `queue_full_base_total` | `u64` | Route drops in base-queue path. |
 | `queue_full_high_total` | `u64` | Route drops in high-priority queue path. |

+#### `RuntimeMeQualityFamilyStateData`
+| Field | Type | Description |
+| --- | --- | --- |
+| `family` | `string` | Address family label. |
+| `state` | `string` | Current family state label. |
+| `state_since_epoch_secs` | `u64` | Unix timestamp when current state began. |
+| `suppressed_until_epoch_secs` | `u64?` | Unix timestamp until suppression remains active. |
+| `fail_streak` | `u32` | Consecutive failure count. |
+| `recover_success_streak` | `u32` | Consecutive recovery success count. |
+
+#### `RuntimeMeQualityDrainGateData`
+| Field | Type | Description |
+| --- | --- | --- |
+| `route_quorum_ok` | `bool` | Whether route quorum condition allows drain. |
+| `redundancy_ok` | `bool` | Whether redundancy condition allows drain. |
+| `block_reason` | `string` | Current drain block reason label. |
+| `updated_at_epoch_secs` | `u64` | Unix timestamp of the latest gate update. |
+
 #### `RuntimeMeQualityDcRttData`
 | Field | Type | Description |
 | --- | --- | --- |
@@ -712,6 +816,43 @@ Note: the request contract is defined, but the corresponding route currently ret
 | `event_type` | `string` | Event kind identifier. |
 | `context` | `string` | Context text (truncated to implementation-defined max length). |

+### `RuntimeEdgeTlsFingerprintsData`
+| Field | Type | Description |
+| --- | --- | --- |
+| `enabled` | `bool` | Endpoint availability under `runtime_edge_enabled`. |
+| `reason` | `string?` | `feature_disabled` when endpoint is disabled. |
+| `generated_at_epoch_secs` | `u64` | Snapshot generation timestamp. |
+| `data` | `RuntimeEdgeTlsFingerprintsPayload?` | Null when unavailable. |
+
+#### `RuntimeEdgeTlsFingerprintsPayload`
+| Field | Type | Description |
+| --- | --- | --- |
+| `limit` | `usize` | Effective Top-N row count. |
+| `retention_secs` | `u64` | In-memory retention window, derived from `general.beobachten_minutes`. |
+| `capacity` | `usize` | Maximum retained fingerprint buckets. |
+| `dropped_total` | `u64` | Buckets dropped because the collector was full. |
+| `parse_error_total` | `u64` | Complete ClientHello records that could not be fingerprinted. |
+| `by_fingerprint` | `RuntimeEdgeTlsFingerprintRow[]` | Global JA3/JA4 leaderboard. |
+| `by_ip` | `RuntimeEdgeTlsFingerprintRow[]` | Source-IP scoped leaderboard. |
+| `by_cidr` | `RuntimeEdgeTlsFingerprintRow[]` | Source CIDR scoped leaderboard (`/24` for IPv4, `/56` for IPv6). |
+| `by_user` | `RuntimeEdgeTlsFingerprintRow[]` | Authenticated user scoped leaderboard. |
+
+#### `RuntimeEdgeTlsFingerprintRow`
+| Field | Type | Description |
+| --- | --- | --- |
+| `scope` | `string?` | IP, CIDR, or username; absent in `by_fingerprint`. |
+| `ja3` | `string` | JA3 MD5 hash. |
+| `ja3_raw` | `string` | Raw JA3 field string. |
+| `ja4` | `string` | JA4 TLS client fingerprint. |
+| `ja4_raw` | `string` | Raw JA4 material used for the hashed parts. |
+| `total` | `u64` | Complete ClientHello observations for this bucket. |
+| `auth_success` | `u64` | TLS-authenticated observations for this bucket. |
+| `bad_or_probe` | `u64` | Complete ClientHello observations later classified as bad/probe. |
+| `first_seen_epoch_secs` | `u64` | First observation timestamp. |
+| `last_seen_epoch_secs` | `u64` | Last observation timestamp. |
+
+JA3 follows the Salesforce ClientHello field order. JA4 follows the FoxIO TLS-client `a_b_c` format; GREASE values are excluded and no high-cardinality Prometheus labels are emitted for fingerprints.
+
 ### `ZeroAllData`
 | Field | Type | Description |
 | --- | --- | --- |
@@ -728,11 +869,24 @@ Note: the request contract is defined, but the corresponding route currently ret
 | `uptime_seconds` | `f64` | Process uptime. |
 | `connections_total` | `u64` | Total accepted connections. |
 | `connections_bad_total` | `u64` | Failed/invalid connections. |
+| `connections_bad_by_class` | `ClassCount[]` | Failed/invalid connections grouped by class. |
+| `handshake_failures_by_class` | `ClassCount[]` | Handshake failures grouped by class. |
 | `handshake_timeouts_total` | `u64` | Handshake timeouts. |
+| `accept_permit_timeout_total` | `u64` | Listener admission permit acquisition timeouts. |
 | `configured_users` | `usize` | Configured user count. |
 | `telemetry_core_enabled` | `bool` | Core telemetry toggle. |
 | `telemetry_user_enabled` | `bool` | User telemetry toggle. |
 | `telemetry_me_level` | `string` | ME telemetry level (`off|normal|verbose`). |
+| `conntrack_control_enabled` | `bool` | Whether conntrack control is enabled by policy. |
+| `conntrack_control_available` | `bool` | Whether conntrack control backend is currently available. |
+| `conntrack_pressure_active` | `bool` | Current conntrack pressure flag. |
+| `conntrack_event_queue_depth` | `u64` | Current conntrack close-event queue depth. |
+| `conntrack_rule_apply_ok` | `bool` | Last conntrack rule application state. |
+| `conntrack_delete_attempt_total` | `u64` | Conntrack delete attempts. |
+| `conntrack_delete_success_total` | `u64` | Successful conntrack deletes. |
+| `conntrack_delete_not_found_total` | `u64` | Conntrack delete misses. |
+| `conntrack_delete_error_total` | `u64` | Conntrack delete errors. |
+| `conntrack_close_event_drop_total` | `u64` | Dropped conntrack close events. |

 #### `ZeroUpstreamData`
 | Field | Type | Description |
@@ -819,6 +973,24 @@ Note: the request contract is defined, but the corresponding route currently ret
 | `route_drop_queue_full_total` | `u64` | Route drops due to full queue (total). |
 | `route_drop_queue_full_base_total` | `u64` | Route drops in base queue mode. |
 | `route_drop_queue_full_high_total` | `u64` | Route drops in high queue mode. |
+| `d2c_batches_total` | `u64` | ME D->C batch flushes. |
+| `d2c_batch_frames_total` | `u64` | ME D->C frames included in batches. |
+| `d2c_batch_bytes_total` | `u64` | ME D->C payload bytes included in batches. |
+| `d2c_flush_reason_queue_drain_total` | `u64` | Flushes caused by queue drain. |
+| `d2c_flush_reason_batch_frames_total` | `u64` | Flushes caused by frame-count batch limit. |
+| `d2c_flush_reason_batch_bytes_total` | `u64` | Flushes caused by byte-count batch limit. |
+| `d2c_flush_reason_max_delay_total` | `u64` | Flushes caused by max-delay budget. |
+| `d2c_flush_reason_ack_immediate_total` | `u64` | Flushes caused by immediate ACK policy. |
+| `d2c_flush_reason_close_total` | `u64` | Flushes caused by close path. |
+| `d2c_data_frames_total` | `u64` | ME D->C data frames. |
+| `d2c_ack_frames_total` | `u64` | ME D->C ACK frames. |
+| `d2c_payload_bytes_total` | `u64` | ME D->C payload bytes. |
+| `d2c_write_mode_coalesced_total` | `u64` | Coalesced D->C writes. |
+| `d2c_write_mode_split_total` | `u64` | Split D->C writes. |
+| `d2c_quota_reject_pre_write_total` | `u64` | D->C quota rejects before write. |
+| `d2c_quota_reject_post_write_total` | `u64` | D->C quota rejects after write. |
+| `d2c_frame_buf_shrink_total` | `u64` | D->C frame-buffer shrink operations. |
+| `d2c_frame_buf_shrink_bytes_total` | `u64` | Bytes released by D->C frame-buffer shrink operations. |
 | `socks_kdf_strict_reject_total` | `u64` | SOCKS KDF strict rejects. |
 | `socks_kdf_compat_fallback_total` | `u64` | SOCKS KDF compat fallbacks. |
 | `endpoint_quarantine_total` | `u64` | Endpoint quarantine activations. |
@@ -978,6 +1150,8 @@ Note: the request contract is defined, but the corresponding route currently ret
 | `required_writers` | `usize` | Required writers based on current floor policy. |
 | `alive_writers` | `usize` | Writers currently alive. |
 | `coverage_pct` | `f64` | `alive_writers / required_writers * 100`. |
+| `fresh_alive_writers` | `usize` | Alive writers that match freshness requirements. |
+| `fresh_coverage_pct` | `f64` | `fresh_alive_writers / required_writers * 100`. |

 #### `MeWriterStatus`
 | Field | Type | Description |
@@ -992,6 +1166,12 @@ Note: the request contract is defined, but the corresponding route currently ret
 | `bound_clients` | `usize` | Number of currently bound clients. |
 | `idle_for_secs` | `u64?` | Idle age in seconds if idle. |
 | `rtt_ema_ms` | `f64?` | RTT exponential moving average. |
+| `matches_active_generation` | `bool` | Whether this writer belongs to the active pool generation. |
+| `in_desired_map` | `bool` | Whether this writer's endpoint remains in desired topology. |
+| `allow_drain_fallback` | `bool` | Whether drain fallback is allowed for this writer. |
+| `drain_started_at_epoch_secs` | `u64?` | Unix timestamp when drain started. |
+| `drain_deadline_epoch_secs` | `u64?` | Unix timestamp of drain deadline. |
+| `drain_over_ttl` | `bool` | Whether drain has exceeded its TTL. |

 ### `DcStatusData`
 | Field | Type | Description |
@@ -1016,6 +1196,8 @@ Note: the request contract is defined, but the corresponding route currently ret
 | `floor_capped` | `bool` | `true` when computed floor target was capped by active limits. |
 | `alive_writers` | `usize` | Alive writers in this DC. |
 | `coverage_pct` | `f64` | `alive_writers / required_writers * 100`. |
+| `fresh_alive_writers` | `usize` | Fresh alive writers in this DC. |
+| `fresh_coverage_pct` | `f64` | `fresh_alive_writers / required_writers * 100`. |
 | `rtt_ms` | `f64?` | Aggregated RTT for DC. |
 | `load` | `usize` | Active client sessions bound to this DC. |

@@ -1029,10 +1211,14 @@ Note: the request contract is defined, but the corresponding route currently ret
 | Field | Type | Description |
 | --- | --- | --- |
 | `username` | `string` | Username. |
+| `enabled` | `bool` | Effective user enable flag. Missing config entry is reported as `true`. |
+| `in_runtime` | `bool` | Whether current runtime config already contains this user. |
 | `user_ad_tag` | `string?` | Optional ad tag (32 hex chars). |
 | `max_tcp_conns` | `usize?` | Optional max concurrent TCP limit. |
 | `expiration_rfc3339` | `string?` | Optional expiration timestamp. |
 | `data_quota_bytes` | `u64?` | Optional data quota. |
+| `rate_limit_up_bps` | `u64?` | Optional upload rate limit in bytes per second. |
+| `rate_limit_down_bps` | `u64?` | Optional download rate limit in bytes per second. |
 | `max_unique_ips` | `usize?` | Optional unique IP limit. |
 | `current_connections` | `u64` | Current live connections. |
 | `active_unique_ips` | `usize` | Current active unique source IPs. |
@@ -1042,12 +1228,25 @@ Note: the request contract is defined, but the corresponding route currently ret
 | `total_octets` | `u64` | Total traffic octets for this user. |
 | `links` | `UserLinks` | Active connection links derived from current config. |

+### `UserActiveIps`
+| Field | Type | Description |
+| --- | --- | --- |
+| `username` | `string` | Username with at least one active tracked source IP. |
+| `active_ips` | `ip[]` | Active source IPs for this user. |
+
 #### `UserLinks`
 | Field | Type | Description |
 | --- | --- | --- |
 | `classic` | `string[]` | Active `tg://proxy` links for classic mode. |
 | `secure` | `string[]` | Active `tg://proxy` links for secure/DD mode. |
 | `tls` | `string[]` | Active `tg://proxy` links for EE-TLS mode (for each host+TLS domain). |
+| `tls_domains` | `TlsDomainLink[]` | Extra TLS-domain links as explicit domain/link pairs for `censorship.tls_domains`. |
+
+#### `TlsDomainLink`
+| Field | Type | Description |
+| --- | --- | --- |
+| `domain` | `string` | TLS domain represented by the link. |
+| `link` | `string` | `tg://proxy` link for this domain. |

 Link generation uses active config and enabled modes:
 - Link port is `general.links.public_port` when configured; otherwise `server.port`.
@@ -1067,13 +1266,29 @@ Link generation uses active config and enabled modes:
 | `user` | `UserInfo` | Created or updated user view. |
 | `secret` | `string` | Effective user secret. |

+### `DeleteUserResponse`
+| Field | Type | Description |
+| --- | --- | --- |
+| `username` | `string` | Deleted username. |
+| `in_runtime` | `bool` | `true` when runtime config still contains the user and hot-reload has not applied deletion yet. |
+
+### `ResetUserQuotaResponse`
+| Field | Type | Description |
+| --- | --- | --- |
+| `username` | `string` | User whose runtime quota counter was reset. |
+| `used_bytes` | `u64` | Current used bytes after reset; always `0` on success. |
+| `last_reset_epoch_secs` | `u64` | Unix timestamp of the reset operation. |
+
 ## Mutation Semantics

 | Endpoint | Notes |
 | --- | --- |
 | `POST /v1/users` | Creates user, validates config, then atomically updates only affected `access.*` TOML tables (`access.users` always, plus optional per-user tables present in request). |
-| `PATCH /v1/users/{username}` | Partial update of provided fields only. Missing fields remain unchanged. Current implementation persists full config document on success. |
-| `POST /v1/users/{username}/rotate-secret` | Currently returns `404` in runtime route matcher; request schema is reserved for intended behavior. |
+| `PATCH /v1/users/{username}` | Partial update of provided fields only. Missing fields remain unchanged; explicit `null` removes optional per-user entries. The write path updates only affected `access.*` TOML tables. |
+| `POST /v1/users/{username}/rotate-secret` | Replaces the user's secret with a provided valid 32-hex value or a generated value, then returns the effective secret in `CreateUserResponse`. |
+| `POST /v1/users/{username}/enable` | Enables the user idempotently by removing the `access.user_enabled[username]` override and updating the runtime admission state immediately. |
+| `POST /v1/users/{username}/disable` | Disables the user idempotently by writing `access.user_enabled[username] = false`, updating runtime admission immediately, and cancelling active sessions for that username. |
+| `POST /v1/users/{username}/reset-quota` | Resets the runtime quota counter for the route username, persists quota state to `general.quota_state_path`, and does not modify user config. |
 | `DELETE /v1/users/{username}` | Deletes only specified user, removes this user from related optional `access.user_*` maps, blocks last-user deletion, and atomically updates only related `access.*` TOML tables. |

 All mutating endpoints:
@@ -1082,6 +1297,12 @@ All mutating endpoints:
 - Return new `revision` after successful write.
 - Use process-local mutation lock + atomic write (`tmp + rename`) for config persistence.

+Docker deployment note:
+- Mutating endpoints require `config.toml` to live inside a writable mounted directory.
+- Do not mount `config.toml` as a single bind-mounted file when API mutations are enabled; atomic `tmp + rename` writes can fail with `Device or resource busy`.
+- Mount the config directory instead, for example `./config:/etc/telemt:rw`, and start Telemt with `/etc/telemt/config.toml`.
+- A read-only single-file mount remains valid only for read-only deployments or when `[server.api].read_only=true`.
+
 Delete path cleanup guarantees:
 - Config cleanup removes only the requested username keys.
 - Runtime unique-IP cleanup removes only this user's limiter and tracked IP state.
@@ -1110,16 +1331,17 @@ Additional runtime endpoint behavior:
 | `/v1/runtime/me-selftest` | No | ME pool unavailable => `enabled=false`, `reason=source_unavailable` | `enabled=true`, full payload |
 | `/v1/runtime/connections/summary` | `runtime_edge_enabled=false` => `enabled=false`, `reason=feature_disabled` | Recompute lock contention with no cache entry => `enabled=true`, `reason=source_unavailable` | `enabled=true`, full payload |
 | `/v1/runtime/events/recent` | `runtime_edge_enabled=false` => `enabled=false`, `reason=feature_disabled` | Not used in current implementation | `enabled=true`, full payload |
+| `/v1/runtime/tls-fingerprints` | `runtime_edge_enabled=false` => `enabled=false`, `reason=feature_disabled` | Not used in current implementation | `enabled=true`, full payload |

 ## ME Fallback Behavior Exposed Via API

 When `general.use_middle_proxy=true` and `general.me2dc_fallback=true`:
- Startup does not block on full ME pool readiness; initialization can continue in background.
+- Startup opens Direct-DC routing first, then initializes ME in background and switches new sessions to Middle mode after ME readiness is observed.
 - Runtime initialization payload can expose ME stage `background_init` until pool becomes ready.
 - Admission/routing decision uses two readiness grace windows for "ME not ready" periods:
-  `80s` before first-ever readiness is observed (startup grace),
+  direct startup fallback before first-ever readiness is observed,
  `6s` after readiness has been observed at least once (runtime failover timeout).
- While in fallback window breach, new sessions are routed via Direct-DC; when ME becomes ready, routing returns to Middle mode for new sessions.
+- While fallback is active, new sessions are routed via Direct-DC; when ME becomes ready, routing returns to Middle mode. Direct sessions affected by the cutover are closed with the existing staggered delay so clients reconnect through the current route.

 ## Serialization Rules

@@ -1148,5 +1370,4 @@ When `general.use_middle_proxy=true` and `general.me2dc_fallback=true`:

 ## Known Limitations (Current Release)

- `POST /v1/users/{username}/rotate-secret` is currently unreachable in route matcher and returns `404`.
 - API runtime controls under `server.api` are documented as restart-required; hot-reload behavior for these fields is not strictly uniform in all change combinations.
@@ -0,0 +1,507 @@
+# JA3 и JA4 анализ в Telemt
+
+Этот документ описывает, как использовать JA3/JA4 telemetry в Telemt для диагностики блокировок, которые происходят на основе TLS ClientHello, особенно JA4 TLS client fingerprint.
+
+Цель документа практическая: помочь оператору понять, какой клиентский TLS-отпечаток реально доходит до Telemt, как он распределён по IP/CIDR/пользователям, и как отделить JA4-based фильтрацию от блокировки по IP, SNI, домену, server flight или активному сканированию.
+
+## Коротко
+
+JA3 и JA4 описывают форму TLS ClientHello. ClientHello отправляет клиент, поэтому JA3/JA4 в этом контексте являются fingerprint'ами клиентской TLS-реализации, а не Telemt как сервера.
+
+Telemt собирает JA3/JA4 только из уже прочитанного полного ClientHello:
+
+- без packet capture;
+- без MITM;
+- без расшифровки TLS;
+- без дополнительных сетевых чтений;
+- без Prometheus labels с высокой кардинальностью;
+- с ограниченным in-memory TTL/cap collector.
+
+Собранные данные доступны:
+
+- через API: `GET /v1/runtime/tls-fingerprints`;
+- через `/beobachten`, если `general.beobachten=true`.
+
+Основная польза:
+
+- увидеть, какие JA4 реально используют клиенты;
+- понять, один ли fingerprint страдает у всех пользователей;
+- отделить проблему клиента от проблемы IP/ASN/домена;
+- увидеть, доходят ли проблемные соединения до Telemt вообще;
+- сравнить successful TLS-auth и bad/probe поток для одного fingerprint;
+- собрать evidence для последующего изменения клиента, маршрута или deployment-профиля.
+
+## Что такое JA3
+
+JA3 - старый и широко совместимый способ получить hash от TLS ClientHello.
+
+JA3 строится из ClientHello fields:
+
+```text
+SSLVersion,Cipher,SSLExtension,EllipticCurve,EllipticCurvePointFormat
+```
+
+Значения внутри полей записываются в порядке, в котором они пришли в ClientHello. GREASE values исключаются. Итоговая строка хэшируется MD5, поэтому в API есть два поля:
+
+- `ja3` - MD5 hash;
+- `ja3_raw` - исходная строка, из которой получен hash.
+
+Практическое значение JA3 в 2026 году ограничено тем, что современные TLS-клиенты и браузерные стеки могут менять порядок extensions. Поэтому JA3 полезен как совместимый исторический сигнал, но для диагностики современных блокировок обычно важнее JA4.
+
+## Что такое JA4
+
+JA4 TLS client fingerprint - более структурированный fingerprint ClientHello.
+
+JA4 в Telemt считается для TLS-over-TCP ClientHello и имеет форму:
+
+```text
+t<version><sni_marker><cipher_count><extension_count><alpn_marker>_<cipher_hash>_<extension_hash>
+```
+
+Пример:
+
+```text
+t13d1516h2_8daaf6152771_e5627efa2ab1
+```
+
+Части JA4:
+
+| Часть | Смысл |
+| --- | --- |
+| `t` | TLS over TCP. Telemt сейчас не считает JA4 для QUIC/DTLS. |
+| `13`, `12`, `11`, `10` | TLS version, предпочтительно из `supported_versions`. |
+| `d` / `i` | Есть SNI domain (`d`) или SNI отсутствует (`i`). |
+| `15` | Количество cipher suites без GREASE, capped до `99`. |
+| `16` | Количество extensions без GREASE, capped до `99`. |
+| `h2`, `h1`, `00` | ALPN marker: первый и последний символ первого ALPN value или `00`. |
+| `cipher_hash` | SHA256 от отсортированного списка ciphers, первые 12 hex chars. |
+| `extension_hash` | SHA256 от отсортированных extensions плюс signature algorithms, первые 12 hex chars. |
+
+Важное отличие JA4 от JA3: JA4 нормализует часть полей, поэтому он устойчивее к простому изменению порядка extensions. Это делает JA4 удобным для фильтров и одновременно полезным для диагностики таких фильтров.
+
+## Где Telemt видит ClientHello
+
+В TLS/FakeTLS режиме Telemt получает первые bytes соединения и определяет, похоже ли оно на TLS handshake. Если record является полным ClientHello и проходит bounds checks, Telemt один раз парсит его для JA3/JA4.
+
+Дальше возможны три исхода:
+
+1. **Успешный MTProxy/FakeTLS клиент**
+   - Telemt принимает TLS-auth;
+   - fingerprint записывается в global/IP/CIDR scopes;
+   - после успешной TLS-auth Telemt добавляет user scope.
+
+2. **Bad client или probe**
+   - ClientHello полный, но auth не проходит;
+   - fingerprint записывается в global/IP/CIDR scopes;
+   - user scope не записывается;
+   - `bad_or_probe` увеличивается.
+
+3. **Неполный или обрезанный ClientHello**
+   - fingerprint не считается;
+   - такие случаи остаются в существующих bad-class counters.
+
+Если фильтр режет трафик до того, как TCP connection или ClientHello дошли до процесса Telemt, Telemt не увидит этот fingerprint. Это важнейшее диагностическое отличие: отсутствие fingerprint'а во время жалобы пользователя часто означает блокировку до приложения, а не проблему внутри Telemt.
+
+## Включение сбора
+
+Collector включается, когда включён хотя бы один потребитель:
+
+```toml
+[general]
+beobachten = true
+beobachten_minutes = 10
+```
+
+или:
+
+```toml
+[server.api]
+runtime_edge_enabled = true
+runtime_edge_top_n = 50
+```
+
+Практически:
+
+- для файлового/metrics endpoint анализа достаточно `general.beobachten=true`;
+- для API snapshot нужен `server.api.runtime_edge_enabled=true`;
+- `general.beobachten_minutes` задаёт retention window для fingerprint buckets;
+- `server.api.runtime_edge_top_n` задаёт default Top-N размер API snapshot.
+
+## API snapshot
+
+Endpoint:
+
+```bash
+curl -s http://127.0.0.1:9091/v1/runtime/tls-fingerprints
+```
+
+С явным лимитом:
+
+```bash
+curl -s 'http://127.0.0.1:9091/v1/runtime/tls-fingerprints?limit=100'
+```
+
+Если API защищён header'ом:
+
+```bash
+curl -s \
+  -H 'Authorization: Bearer YOUR_TOKEN' \
+  'http://127.0.0.1:9091/v1/runtime/tls-fingerprints?limit=100'
+```
+
+Если `runtime_edge_enabled=false`, endpoint возвращает payload с:
+
+```json
+{
+  "enabled": false,
+  "reason": "feature_disabled"
+}
+```
+
+### Структура payload
+
+Основные поля:
+
+| Поле | Смысл |
+| --- | --- |
+| `retention_secs` | Текущее TTL окно collector'а. |
+| `capacity` | Максимум retained buckets. |
+| `dropped_total` | Сколько новых buckets отброшено из-за cap. |
+| `parse_error_total` | Сколько полных ClientHello не удалось распарсить. |
+| `by_fingerprint` | Top fingerprints глобально. |
+| `by_ip` | Top fingerprints по exact source IP. |
+| `by_cidr` | Top fingerprints по source prefix: IPv4 `/24`, IPv6 `/56`. |
+| `by_user` | Top fingerprints по authenticated user. |
+
+Строка snapshot:
+
+| Поле | Смысл |
+| --- | --- |
+| `scope` | IP, CIDR или username. В `by_fingerprint` отсутствует. |
+| `ja3` | JA3 hash. |
+| `ja3_raw` | Raw JA3 string. |
+| `ja4` | JA4 TLS client fingerprint. |
+| `ja4_raw` | Raw JA4 material. |
+| `total` | Сколько полных ClientHello попало в этот bucket. |
+| `auth_success` | Сколько из них успешно прошли TLS-auth. |
+| `bad_or_probe` | Сколько были bad/probe после полного ClientHello. |
+| `first_seen_epoch_secs` | Первый timestamp bucket'а. |
+| `last_seen_epoch_secs` | Последний timestamp bucket'а. |
+
+### Быстрый просмотр через jq
+
+Top JA4 глобально:
+
+```bash
+curl -s http://127.0.0.1:9091/v1/runtime/tls-fingerprints \
+  | jq -r '.data.data.by_fingerprint[] | [.ja4, .total, .auth_success, .bad_or_probe] | @tsv'
+```
+
+Top JA4 по пользователям:
+
+```bash
+curl -s http://127.0.0.1:9091/v1/runtime/tls-fingerprints?limit=100 \
+  | jq -r '.data.data.by_user[] | [.scope, .ja4, .total, .auth_success] | @tsv'
+```
+
+Top JA4 по CIDR:
+
+```bash
+curl -s http://127.0.0.1:9091/v1/runtime/tls-fingerprints?limit=100 \
+  | jq -r '.data.data.by_cidr[] | [.scope, .ja4, .total, .auth_success, .bad_or_probe] | @tsv'
+```
+
+Ошибки парсинга и drops:
+
+```bash
+curl -s http://127.0.0.1:9091/v1/runtime/tls-fingerprints \
+  | jq '.data.data | {retention_secs, capacity, dropped_total, parse_error_total}'
+```
+
+## Beobachten output
+
+Если включён endpoint metrics, `/beobachten` содержит обычные forensic buckets и, когда есть данные, append-only секцию TLS fingerprints:
+
+```bash
+curl -s http://127.0.0.1:9090/beobachten
+```
+
+Фрагмент:
+
+```text
+[tls_fingerprints]
+retention_secs=600 capacity=65536 dropped_total=0 parse_error_total=0
+[tls_fingerprints.by_fingerprint]
+ja4=t13d1516h2_8daaf6152771_e5627efa2ab1 ja3=... total=42 auth_success=41 bad_or_probe=1 first_seen=... last_seen=...
+[tls_fingerprints.by_cidr]
+scope=203.0.113.0/24 ja4=t13d1516h2_8daaf6152771_e5627efa2ab1 ja3=... total=10 auth_success=10 bad_or_probe=0 first_seen=... last_seen=...
+```
+
+`/beobachten` удобен для быстрой операторской диагностики без API client. API удобнее для автоматической корреляции.
+
+## Как анализировать JA4-based блокировку
+
+### 1. Зафиксировать симптом
+
+Перед анализом нужно записать:
+
+- какие пользователи жалуются;
+- какая версия Telegram client используется;
+- какая платформа: Desktop, Android, iOS;
+- какой источник сети: mobile ISP, home ISP, corporate network, country/region;
+- работает ли тот же пользователь через другой network path;
+- работает ли другой пользователь с того же IP/CIDR;
+- видит ли Telemt новые ClientHello от проблемного пользователя в момент попытки.
+
+JA4 без контекста почти всегда недостаточен. Фильтры часто используют сочетание:
+
+- JA4;
+- destination IP;
+- SNI;
+- порт;
+- ASN/source network;
+- rate или connection pattern;
+- reputation домена/IP;
+- active probing result.
+
+### 2. Проверить, доходит ли ClientHello до Telemt
+
+Во время попытки подключения проблемного пользователя смотрите:
+
+```bash
+curl -s 'http://127.0.0.1:9091/v1/runtime/tls-fingerprints?limit=200' \
+  | jq '.data.data.by_user, .data.data.by_ip, .data.data.by_cidr'
+```
+
+Интерпретация:
+
+| Наблюдение | Вероятный вывод |
+| --- | --- |
+| Нет новых rows для IP/CIDR пользователя | Блокировка до Telemt: routing, firewall, ISP/DPI drop, IP block, SYN/TCP reset, UDP/TCP path issue. |
+| Есть `by_ip`/`by_cidr`, но нет `by_user` | ClientHello дошёл, но TLS-auth/MTProxy layer не дошёл до успешного пользователя. Возможны bad key, probe, wrong client, active scanner, обрыв после ClientHello. |
+| Есть `by_user.auth_success` | Клиентский JA4 дошёл и был принят Telemt. Если пользователь всё равно видит проблему, искать нужно дальше: relay path, Telegram upstream, quota, route mode, session cancellation, ME/direct routing. |
+| Резко растёт `bad_or_probe` для одного JA4 | Вероятны сканеры или неправильные клиенты с тем же fingerprint family. |
+
+### 3. Сравнить working и blocked случаи
+
+Снимите snapshot во время working case и blocked case:
+
+```bash
+curl -s 'http://127.0.0.1:9091/v1/runtime/tls-fingerprints?limit=500' > tls-fp-working.json
+curl -s 'http://127.0.0.1:9091/v1/runtime/tls-fingerprints?limit=500' > tls-fp-blocked.json
+```
+
+Сравните:
+
+- появился ли тот же `ja4` в blocked сети;
+- меняется ли `ja4` между версиями клиента;
+- меняется ли только IP/CIDR при том же `ja4`;
+- есть ли `auth_success` для того же `ja4` из других сетей;
+- отличается ли `bad_or_probe` между сетями.
+
+Ключевая матрица:
+
+| Working JA4 | Blocked JA4 | Вывод |
+| --- | --- | --- |
+| Same | Same, но blocked network не доходит до Telemt | Вероятна фильтрация по JA4 + destination/IP/SNI/network до приложения. |
+| Same | Same, доходит и `auth_success>0` | JA4 ClientHello не является точкой отказа; искать post-auth проблему. |
+| Different | Blocked только один JA4 | Вероятен client-version/platform-specific fingerprint block. |
+| Same | `bad_or_probe` растёт, `auth_success=0` | Возможно, доходит не тот клиент/secret или фильтр/прокси ломает поток после ClientHello. |
+
+### 4. Разделить client JA4 и server fingerprint
+
+JA4 ClientHello - это клиентская сторона. Настройки Telemt вроде TLS-front server flight, `mask_host`, ticket-tail или CCS replay не меняют ClientHello, который отправляет Telegram client.
+
+Если фильтр принимает решение строго после ClientHello, то серверные улучшения могут не помочь. В этом случае полезные действия:
+
+- проверить обновление Telegram client;
+- сравнить платформы и версии клиента;
+- проверить, меняется ли JA4 на другой версии;
+- проверить, блокируется ли тот же JA4 к другому destination;
+- проверить, блокируется ли другой JA4 к тому же Telemt IP/SNI;
+- собрать evidence для client-side fingerprint fix.
+
+Если ClientHello проходит, а блокировка возникает после server response, тогда уже важны:
+
+- форма FakeTLS server flight;
+- TLS front profile fidelity;
+- `mask_host` поведение для non-auth clients;
+- certificate/provenance fallback для сканеров;
+- TCP relay behavior;
+- upstream route к Telegram.
+
+### 5. Коррелировать с packet capture
+
+Telemt collector показывает только то, что процесс увидел. Для подтверждения фильтрации до Telemt нужен внешний capture.
+
+На сервере:
+
+```bash
+sudo tcpdump -i any -w telemt-clienthello.pcap host CLIENT_IP and port 443
+```
+
+Быстрый tshark вывод ClientHello fields:
+
+```bash
+tshark -r telemt-clienthello.pcap -Y "tls.handshake.type == 1" -T fields \
+  -e frame.time_epoch \
+  -e ip.src \
+  -e ip.dst \
+  -e tcp.srcport \
+  -e tcp.dstport \
+  -e tls.handshake.extensions_server_name \
+  -e tls.handshake.extensions_alpn_str
+```
+
+Если на клиентской стороне capture видит ClientHello, а серверный capture не видит, проблема в сети между клиентом и сервером. Если серверный capture видит ClientHello, но Telemt API не видит fingerprint, проверьте порт, listener, PROXY protocol, TLS record fragmentation и bounds/errors.
+
+## Практические сценарии
+
+### Сценарий A: один JA4 перестал работать у многих пользователей
+
+Признаки:
+
+- один `ja4` доминирует в жалобах;
+- у разных source CIDR нет `auth_success`;
+- working пользователи используют другой JA4;
+- обновление клиента меняет поведение.
+
+Вероятный вывод: фильтр на стороне сети научился распознавать конкретный ClientHello family.
+
+Действия:
+
+- сравнить Telegram client versions;
+- проверить, не используют ли пользователи старые клиенты;
+- собрать `ja4`, `ja4_raw`, platform/version, source network;
+- проверить тот же client через другую сеть;
+- проверить другой client version через ту же сеть.
+
+### Сценарий B: один CIDR не работает, JA4 обычный
+
+Признаки:
+
+- тот же `ja4` успешно работает из других сетей;
+- проблемный `/24` или `/56` не доходит до Telemt или не получает `auth_success`;
+- нет общей корреляции по версии клиента.
+
+Вероятный вывод: проблема не в JA4 alone, а в source network policy или destination reputation.
+
+Действия:
+
+- сменить route/VPS/IP;
+- проверить port;
+- проверить SNI/domain reputation;
+- сравнить с другим Telemt endpoint;
+- смотреть server-side packet capture.
+
+### Сценарий C: много `bad_or_probe` на одном JA4
+
+Признаки:
+
+- `bad_or_probe` высокий;
+- `by_user` пустой или слабый;
+- source IP/CIDR разнообразные;
+- попытки не соответствуют реальным пользователям.
+
+Вероятный вывод: активное сканирование или нерелевантный TLS traffic с похожим ClientHello.
+
+Действия:
+
+- смотреть `/beobachten` по IP classes;
+- проверить `unknown_tls_sni` и bad-client counters;
+- убедиться, что fallback `mask_host` отвечает правдоподобно;
+- не делать вывод о блокировке пользователей только по global `bad_or_probe`.
+
+### Сценарий D: `auth_success` есть, но пользователь жалуется
+
+Признаки:
+
+- fingerprint присутствует в `by_user`;
+- `auth_success` растёт;
+- соединение проходит TLS-auth.
+
+Вероятный вывод: JA4 ClientHello не является причиной отказа в этом случае.
+
+Действия:
+
+- проверить user enabled/disabled status;
+- проверить quota;
+- проверить direct/ME route;
+- проверить upstream health;
+- проверить runtime events;
+- смотреть relay/session logs.
+
+## Что нельзя вывести из JA3/JA4
+
+JA3/JA4 не говорят:
+
+- почему сеть приняла решение о блокировке;
+- какой именно vendor DPI используется;
+- был ли block только по JA4 или по связке JA4+IP+SNI;
+- что произошло с соединением после TLS-auth;
+- как выглядит server-side TLS fingerprint;
+- как ведёт себя HTTP layer после TLS.
+
+JA3/JA4 также не являются уникальной идентичностью человека. Это fingerprint клиентской TLS-реализации и её настроек. Один fingerprint может быть у большого числа пользователей.
+
+## Ограничения collector'а Telemt
+
+- Считается только TLS ClientHello, который полностью дошёл до Telemt.
+- QUIC/DTLS/HTTP JA4 variants не собираются.
+- Truncated ClientHello не fingerprint'ится.
+- User scope появляется только после успешной TLS-auth.
+- `by_ip` и `by_cidr` отражают source address после нормализации/PROXY protocol path, если он используется.
+- Collector bounded: при большом количестве уникальных buckets возможен рост `dropped_total`.
+- Retention зависит от `general.beobachten_minutes`.
+- Данные runtime in-memory; это snapshot для диагностики, а не долговременное хранилище.
+
+## Рекомендованный workflow расследования
+
+1. Включить `runtime_edge_enabled=true` и разумный `runtime_edge_top_n`, например `100`.
+2. Зафиксировать baseline в период нормальной работы.
+3. Во время жалобы снять API snapshot и `/beobachten`.
+4. Сравнить `by_user`, `by_ip`, `by_cidr`, `by_fingerprint`.
+5. Проверить, появляется ли problematic source в Telemt вообще.
+6. Если не появляется, снять packet capture на сервере и клиенте.
+7. Если появляется без `auth_success`, проверить secret/client/proxy link и bad/probe counters.
+8. Если появляется с `auth_success`, исключить JA4 ClientHello как primary cause и перейти к relay/upstream/runtime диагностике.
+9. Если один JA4 стабильно коррелирует с block, собрать client version/platform evidence.
+10. Проверить, меняет ли обновление клиента JA4 и результат подключения.
+
+## Минимальный incident report
+
+Для полезного отчёта по JA4-based блокировке соберите:
+
+```text
+time_window:
+telemt_version:
+server_ip:
+server_port:
+tls_domain:
+mask_host:
+client_platform:
+client_version:
+source_network:
+source_ip_or_cidr:
+ja4:
+ja4_raw:
+ja3:
+total:
+auth_success:
+bad_or_probe:
+seen_in_by_user: yes/no
+seen_in_by_ip: yes/no
+seen_in_by_cidr: yes/no
+server_tcpdump_seen_clienthello: yes/no
+client_tcpdump_sent_clienthello: yes/no
+works_from_other_network: yes/no
+works_with_other_client_version: yes/no
+```
+
+Этот набор обычно достаточен, чтобы отличить client fingerprint block от IP/SNI/reputation block и от post-auth проблем Telemt.
+
+## Источники форматов
+
+- JA3 reference: https://github.com/salesforce/ja3
+- JA4 technical details: https://github.com/FoxIO-LLC/ja4/blob/main/technical_details/JA4.md
+
@@ -10,6 +10,8 @@ This document lists all configuration keys accepted by `config.toml`.
 >
 > The configuration parameters detailed in this document are intended for advanced users and fine-tuning purposes. Modifying these settings without a clear understanding of their function may lead to application instability or other unexpected behavior. Please proceed with caution and at your own risk.

+> `Hot-Reload` marks whether a changed value is applied by the config watcher without restarting the process; `✘` means restart is required for runtime effect.
+
 # Table of contents
 - [Top-level keys](#top-level-keys)
 - [general](#general)
@@ -29,12 +31,16 @@ This document lists all configuration keys accepted by `config.toml`.

 # Top-level keys

-| Key | Type | Default |
-| --- | ---- | ------- |
-| [`include`](#include) | `String` (special directive) | — |
-| [`show_link`](#show_link) | `"*"` or `String[]` | `[]` (`ShowLink::None`) |
-| [`dc_overrides`](#dc_overrides) | `Map<String, String or String[]>` | `{}` |
-| [`default_dc`](#default_dc) | `u8` | — (effective fallback: `2` in ME routing) |
+| Key | Type | Default | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`include`](#include) | `String` (special directive) | — | `✔` |
+| [`show_link`](#show_link) | `"*"` or `String[]` | `[]` (`ShowLink::None`) | `✘` |
+| [`dc_overrides`](#dc_overrides) | `Map<String, String or String[]>` | `{}` | `✘` |
+| [`default_dc`](#default_dc) | `u8` | — (effective fallback: `2` in ME routing) | `✘` |
+| [`beobachten`](#beobachten) | `bool` | `true` | `✘` |
+| [`beobachten_minutes`](#beobachten_minutes) | `u64` | `10` | `✘` |
+| [`beobachten_flush_secs`](#beobachten_flush_secs) | `u64` | `15` | `✘` |
+| [`beobachten_file`](#beobachten_file) | `String` | `"cache/beobachten.txt"` | `✘` |

 ## include
  - **Constraints / validation**: Must be a single-line directive in the form `include = "path/to/file.toml"`. Includes are expanded before TOML parsing. Maximum include depth is 10.
@@ -79,145 +85,152 @@ This document lists all configuration keys accepted by `config.toml`.

 # [general]

-| Key | Type | Default |
-| --- | ---- | ------- |
-| [`data_path`](#data_path) | `String` | — |
-| [`prefer_ipv6`](#prefer_ipv6) | `bool` | `false` |
-| [`fast_mode`](#fast_mode) | `bool` | `true` |
-| [`use_middle_proxy`](#use_middle_proxy) | `bool` | `true` |
-| [`proxy_secret_path`](#proxy_secret_path) | `String` | `"proxy-secret"` |
-| [`proxy_config_v4_cache_path`](#proxy_config_v4_cache_path) | `String` | `"cache/proxy-config-v4.txt"` |
-| [`proxy_config_v6_cache_path`](#proxy_config_v6_cache_path) | `String` | `"cache/proxy-config-v6.txt"` |
-| [`ad_tag`](#ad_tag) | `String` | — |
-| [`middle_proxy_nat_ip`](#middle_proxy_nat_ip) | `IpAddr` | — |
-| [`middle_proxy_nat_probe`](#middle_proxy_nat_probe) | `bool` | `true` |
-| [`middle_proxy_nat_stun`](#middle_proxy_nat_stun) | `String` | — |
-| [`middle_proxy_nat_stun_servers`](#middle_proxy_nat_stun_servers) | `String[]` | `[]` |
-| [`stun_nat_probe_concurrency`](#stun_nat_probe_concurrency) | `usize` | `8` |
-| [`middle_proxy_pool_size`](#middle_proxy_pool_size) | `usize` | `8` |
-| [`middle_proxy_warm_standby`](#middle_proxy_warm_standby) | `usize` | `16` |
-| [`me_init_retry_attempts`](#me_init_retry_attempts) | `u32` | `0` |
-| [`me2dc_fallback`](#me2dc_fallback) | `bool` | `true` |
-| [`me2dc_fast`](#me2dc_fast) | `bool` | `false` |
-| [`me_keepalive_enabled`](#me_keepalive_enabled) | `bool` | `true` |
-| [`me_keepalive_interval_secs`](#me_keepalive_interval_secs) | `u64` | `8` |
-| [`me_keepalive_jitter_secs`](#me_keepalive_jitter_secs) | `u64` | `2` |
-| [`me_keepalive_payload_random`](#me_keepalive_payload_random) | `bool` | `true` |
-| [`rpc_proxy_req_every`](#rpc_proxy_req_every) | `u64` | `0` |
-| [`me_writer_cmd_channel_capacity`](#me_writer_cmd_channel_capacity) | `usize` | `4096` |
-| [`me_route_channel_capacity`](#me_route_channel_capacity) | `usize` | `768` |
-| [`me_c2me_channel_capacity`](#me_c2me_channel_capacity) | `usize` | `1024` |
-| [`me_c2me_send_timeout_ms`](#me_c2me_send_timeout_ms) | `u64` | `4000` |
-| [`me_reader_route_data_wait_ms`](#me_reader_route_data_wait_ms) | `u64` | `2` |
-| [`me_d2c_flush_batch_max_frames`](#me_d2c_flush_batch_max_frames) | `usize` | `32` |
-| [`me_d2c_flush_batch_max_bytes`](#me_d2c_flush_batch_max_bytes) | `usize` | `131072` |
-| [`me_d2c_flush_batch_max_delay_us`](#me_d2c_flush_batch_max_delay_us) | `u64` | `500` |
-| [`me_d2c_ack_flush_immediate`](#me_d2c_ack_flush_immediate) | `bool` | `true` |
-| [`me_quota_soft_overshoot_bytes`](#me_quota_soft_overshoot_bytes) | `u64` | `65536` |
-| [`me_d2c_frame_buf_shrink_threshold_bytes`](#me_d2c_frame_buf_shrink_threshold_bytes) | `usize` | `262144` |
-| [`direct_relay_copy_buf_c2s_bytes`](#direct_relay_copy_buf_c2s_bytes) | `usize` | `65536` |
-| [`direct_relay_copy_buf_s2c_bytes`](#direct_relay_copy_buf_s2c_bytes) | `usize` | `262144` |
-| [`crypto_pending_buffer`](#crypto_pending_buffer) | `usize` | `262144` |
-| [`max_client_frame`](#max_client_frame) | `usize` | `16777216` |
-| [`desync_all_full`](#desync_all_full) | `bool` | `false` |
-| [`beobachten`](#beobachten) | `bool` | `true` |
-| [`beobachten_minutes`](#beobachten_minutes) | `u64` | `10` |
-| [`beobachten_flush_secs`](#beobachten_flush_secs) | `u64` | `15` |
-| [`beobachten_file`](#beobachten_file) | `String` | `"cache/beobachten.txt"` |
-| [`hardswap`](#hardswap) | `bool` | `true` |
-| [`me_warmup_stagger_enabled`](#me_warmup_stagger_enabled) | `bool` | `true` |
-| [`me_warmup_step_delay_ms`](#me_warmup_step_delay_ms) | `u64` | `500` |
-| [`me_warmup_step_jitter_ms`](#me_warmup_step_jitter_ms) | `u64` | `300` |
-| [`me_reconnect_max_concurrent_per_dc`](#me_reconnect_max_concurrent_per_dc) | `u32` | `8` |
-| [`me_reconnect_backoff_base_ms`](#me_reconnect_backoff_base_ms) | `u64` | `500` |
-| [`me_reconnect_backoff_cap_ms`](#me_reconnect_backoff_cap_ms) | `u64` | `30000` |
-| [`me_reconnect_fast_retry_count`](#me_reconnect_fast_retry_count) | `u32` | `16` |
-| [`me_single_endpoint_shadow_writers`](#me_single_endpoint_shadow_writers) | `u8` | `2` |
-| [`me_single_endpoint_outage_mode_enabled`](#me_single_endpoint_outage_mode_enabled) | `bool` | `true` |
-| [`me_single_endpoint_outage_disable_quarantine`](#me_single_endpoint_outage_disable_quarantine) | `bool` | `true` |
-| [`me_single_endpoint_outage_backoff_min_ms`](#me_single_endpoint_outage_backoff_min_ms) | `u64` | `250` |
-| [`me_single_endpoint_outage_backoff_max_ms`](#me_single_endpoint_outage_backoff_max_ms) | `u64` | `3000` |
-| [`me_single_endpoint_shadow_rotate_every_secs`](#me_single_endpoint_shadow_rotate_every_secs) | `u64` | `900` |
-| [`me_floor_mode`](#me_floor_mode) | `"static"` or `"adaptive"` | `"adaptive"` |
-| [`me_adaptive_floor_idle_secs`](#me_adaptive_floor_idle_secs) | `u64` | `90` |
-| [`me_adaptive_floor_min_writers_single_endpoint`](#me_adaptive_floor_min_writers_single_endpoint) | `u8` | `1` |
-| [`me_adaptive_floor_min_writers_multi_endpoint`](#me_adaptive_floor_min_writers_multi_endpoint) | `u8` | `1` |
-| [`me_adaptive_floor_recover_grace_secs`](#me_adaptive_floor_recover_grace_secs) | `u64` | `180` |
-| [`me_adaptive_floor_writers_per_core_total`](#me_adaptive_floor_writers_per_core_total) | `u16` | `48` |
-| [`me_adaptive_floor_cpu_cores_override`](#me_adaptive_floor_cpu_cores_override) | `u16` | `0` |
-| [`me_adaptive_floor_max_extra_writers_single_per_core`](#me_adaptive_floor_max_extra_writers_single_per_core) | `u16` | `1` |
-| [`me_adaptive_floor_max_extra_writers_multi_per_core`](#me_adaptive_floor_max_extra_writers_multi_per_core) | `u16` | `2` |
-| [`me_adaptive_floor_max_active_writers_per_core`](#me_adaptive_floor_max_active_writers_per_core) | `u16` | `64` |
-| [`me_adaptive_floor_max_warm_writers_per_core`](#me_adaptive_floor_max_warm_writers_per_core) | `u16` | `64` |
-| [`me_adaptive_floor_max_active_writers_global`](#me_adaptive_floor_max_active_writers_global) | `u32` | `256` |
-| [`me_adaptive_floor_max_warm_writers_global`](#me_adaptive_floor_max_warm_writers_global) | `u32` | `256` |
-| [`upstream_connect_retry_attempts`](#upstream_connect_retry_attempts) | `u32` | `2` |
-| [`upstream_connect_retry_backoff_ms`](#upstream_connect_retry_backoff_ms) | `u64` | `100` |
-| [`upstream_connect_budget_ms`](#upstream_connect_budget_ms) | `u64` | `3000` |
-| [`upstream_unhealthy_fail_threshold`](#upstream_unhealthy_fail_threshold) | `u32` | `5` |
-| [`upstream_connect_failfast_hard_errors`](#upstream_connect_failfast_hard_errors) | `bool` | `false` |
-| [`stun_iface_mismatch_ignore`](#stun_iface_mismatch_ignore) | `bool` | `false` |
-| [`unknown_dc_log_path`](#unknown_dc_log_path) | `String` | `"unknown-dc.txt"` |
-| [`unknown_dc_file_log_enabled`](#unknown_dc_file_log_enabled) | `bool` | `false` |
-| [`log_level`](#log_level) | `"debug"`, `"verbose"`, `"normal"`, or `"silent"` | `"normal"` |
-| [`disable_colors`](#disable_colors) | `bool` | `false` |
-| [`me_socks_kdf_policy`](#me_socks_kdf_policy) | `"strict"` or `"compat"` | `"strict"` |
-| [`me_route_backpressure_enabled`](#me_route_backpressure_enabled) | `bool` | `false` |
-| [`me_route_fairshare_enabled`](#me_route_fairshare_enabled) | `bool` | `false` |
-| [`me_route_backpressure_base_timeout_ms`](#me_route_backpressure_base_timeout_ms) | `u64` | `25` |
-| [`me_route_backpressure_high_timeout_ms`](#me_route_backpressure_high_timeout_ms) | `u64` | `120` |
-| [`me_route_backpressure_high_watermark_pct`](#me_route_backpressure_high_watermark_pct) | `u8` | `80` |
-| [`me_health_interval_ms_unhealthy`](#me_health_interval_ms_unhealthy) | `u64` | `1000` |
-| [`me_health_interval_ms_healthy`](#me_health_interval_ms_healthy) | `u64` | `3000` |
-| [`me_admission_poll_ms`](#me_admission_poll_ms) | `u64` | `1000` |
-| [`me_warn_rate_limit_ms`](#me_warn_rate_limit_ms) | `u64` | `5000` |
-| [`me_route_no_writer_mode`](#me_route_no_writer_mode) | `"async_recovery_failfast"`, `"inline_recovery_legacy"`, or `"hybrid_async_persistent"` | `"hybrid_async_persistent"` |
-| [`me_route_no_writer_wait_ms`](#me_route_no_writer_wait_ms) | `u64` | `250` |
-| [`me_route_hybrid_max_wait_ms`](#me_route_hybrid_max_wait_ms) | `u64` | `3000` |
-| [`me_route_blocking_send_timeout_ms`](#me_route_blocking_send_timeout_ms) | `u64` | `250` |
-| [`me_route_inline_recovery_attempts`](#me_route_inline_recovery_attempts) | `u32` | `3` |
-| [`me_route_inline_recovery_wait_ms`](#me_route_inline_recovery_wait_ms) | `u64` | `3000` |
-| [`fast_mode_min_tls_record`](#fast_mode_min_tls_record) | `usize` | `0` |
-| [`update_every`](#update_every) | `u64` | `300` |
-| [`me_reinit_every_secs`](#me_reinit_every_secs) | `u64` | `900` |
-| [`me_hardswap_warmup_delay_min_ms`](#me_hardswap_warmup_delay_min_ms) | `u64` | `1000` |
-| [`me_hardswap_warmup_delay_max_ms`](#me_hardswap_warmup_delay_max_ms) | `u64` | `2000` |
-| [`me_hardswap_warmup_extra_passes`](#me_hardswap_warmup_extra_passes) | `u8` | `3` |
-| [`me_hardswap_warmup_pass_backoff_base_ms`](#me_hardswap_warmup_pass_backoff_base_ms) | `u64` | `500` |
-| [`me_config_stable_snapshots`](#me_config_stable_snapshots) | `u8` | `2` |
-| [`me_config_apply_cooldown_secs`](#me_config_apply_cooldown_secs) | `u64` | `300` |
-| [`me_snapshot_require_http_2xx`](#me_snapshot_require_http_2xx) | `bool` | `true` |
-| [`me_snapshot_reject_empty_map`](#me_snapshot_reject_empty_map) | `bool` | `true` |
-| [`me_snapshot_min_proxy_for_lines`](#me_snapshot_min_proxy_for_lines) | `u32` | `1` |
-| [`proxy_secret_stable_snapshots`](#proxy_secret_stable_snapshots) | `u8` | `2` |
-| [`proxy_secret_rotate_runtime`](#proxy_secret_rotate_runtime) | `bool` | `true` |
-| [`me_secret_atomic_snapshot`](#me_secret_atomic_snapshot) | `bool` | `true` |
-| [`proxy_secret_len_max`](#proxy_secret_len_max) | `usize` | `256` |
-| [`me_pool_drain_ttl_secs`](#me_pool_drain_ttl_secs) | `u64` | `90` |
-| [`me_instadrain`](#me_instadrain) | `bool` | `false` |
-| [`me_pool_drain_threshold`](#me_pool_drain_threshold) | `u64` | `32` |
-| [`me_pool_drain_soft_evict_enabled`](#me_pool_drain_soft_evict_enabled) | `bool` | `true` |
-| [`me_pool_drain_soft_evict_grace_secs`](#me_pool_drain_soft_evict_grace_secs) | `u64` | `10` |
-| [`me_pool_drain_soft_evict_per_writer`](#me_pool_drain_soft_evict_per_writer) | `u8` | `2` |
-| [`me_pool_drain_soft_evict_budget_per_core`](#me_pool_drain_soft_evict_budget_per_core) | `u16` | `16` |
-| [`me_pool_drain_soft_evict_cooldown_ms`](#me_pool_drain_soft_evict_cooldown_ms) | `u64` | `1000` |
-| [`me_bind_stale_mode`](#me_bind_stale_mode) | `"never"`, `"ttl"`, or `"always"` | `"ttl"` |
-| [`me_bind_stale_ttl_secs`](#me_bind_stale_ttl_secs) | `u64` | `90` |
-| [`me_pool_min_fresh_ratio`](#me_pool_min_fresh_ratio) | `f32` | `0.8` |
-| [`me_reinit_drain_timeout_secs`](#me_reinit_drain_timeout_secs) | `u64` | `90` |
-| [`proxy_secret_auto_reload_secs`](#proxy_secret_auto_reload_secs) | `u64` | `3600` |
-| [`proxy_config_auto_reload_secs`](#proxy_config_auto_reload_secs) | `u64` | `3600` |
-| [`me_reinit_singleflight`](#me_reinit_singleflight) | `bool` | `true` |
-| [`me_reinit_trigger_channel`](#me_reinit_trigger_channel) | `usize` | `64` |
-| [`me_reinit_coalesce_window_ms`](#me_reinit_coalesce_window_ms) | `u64` | `200` |
-| [`me_deterministic_writer_sort`](#me_deterministic_writer_sort) | `bool` | `true` |
-| [`me_writer_pick_mode`](#me_writer_pick_mode) | `"sorted_rr"` or `"p2c"` | `"p2c"` |
-| [`me_writer_pick_sample_size`](#me_writer_pick_sample_size) | `u8` | `3` |
-| [`ntp_check`](#ntp_check) | `bool` | `true` |
-| [`ntp_servers`](#ntp_servers) | `String[]` | `["pool.ntp.org"]` |
-| [`auto_degradation_enabled`](#auto_degradation_enabled) | `bool` | `true` |
-| [`degradation_min_unavailable_dc_groups`](#degradation_min_unavailable_dc_groups) | `u8` | `2` |
-| [`rst_on_close`](#rst_on_close) | `"off"`, `"errors"`, or `"always"` | `"off"` |
+
+| Key | Type | Default | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`data_path`](#data_path) | `String` | — | `✘` |
+| [`quota_state_path`](#quota_state_path) | `Path` | `"telemt.limit.json"` | `✘` |
+| [`config_strict`](#config_strict) | `bool` | `false` | `✘` |
+| [`prefer_ipv6`](#prefer_ipv6) | `bool` | `false` | `✘` |
+| [`fast_mode`](#fast_mode) | `bool` | `true` | `✘` |
+| [`use_middle_proxy`](#use_middle_proxy) | `bool` | `true` | `✘` |
+| [`proxy_secret_path`](#proxy_secret_path) | `String` | `"proxy-secret"` | `✘` |
+| [`proxy_secret_url`](#proxy_secret_url) | `String` | `"https://core.telegram.org/getProxySecret"` | `✘` |
+| [`proxy_config_v4_cache_path`](#proxy_config_v4_cache_path) | `String` | `"cache/proxy-config-v4.txt"` | `✘` |
+| [`proxy_config_v4_url`](#proxy_config_v4_url) | `String` | `"https://core.telegram.org/getProxyConfig"` | `✘` |
+| [`proxy_config_v6_cache_path`](#proxy_config_v6_cache_path) | `String` | `"cache/proxy-config-v6.txt"` | `✘` |
+| [`proxy_config_v6_url`](#proxy_config_v6_url) | `String` | `"https://core.telegram.org/getProxyConfigV6"` | `✘` |
+| [`ad_tag`](#ad_tag) | `String` | — | `✔` |
+| [`middle_proxy_nat_ip`](#middle_proxy_nat_ip) | `IpAddr` | — | `✘` |
+| [`middle_proxy_nat_probe`](#middle_proxy_nat_probe) | `bool` | `true` | `✘` |
+| [`middle_proxy_nat_stun`](#middle_proxy_nat_stun) | `String` | — | `✘` |
+| [`middle_proxy_nat_stun_servers`](#middle_proxy_nat_stun_servers) | `String[]` | `[]` | `✘` |
+| [`stun_nat_probe_concurrency`](#stun_nat_probe_concurrency) | `usize` | `8` | `✘` |
+| [`middle_proxy_pool_size`](#middle_proxy_pool_size) | `usize` | `8` | `✘` |
+| [`middle_proxy_warm_standby`](#middle_proxy_warm_standby) | `usize` | `16` | `✘` |
+| [`me_init_retry_attempts`](#me_init_retry_attempts) | `u32` | `0` | `✘` |
+| [`me2dc_fallback`](#me2dc_fallback) | `bool` | `true` | `✘` |
+| [`me2dc_fast`](#me2dc_fast) | `bool` | `false` | `✘` |
+| [`me_keepalive_enabled`](#me_keepalive_enabled) | `bool` | `true` | `✘` |
+| [`me_keepalive_interval_secs`](#me_keepalive_interval_secs) | `u64` | `8` | `✘` |
+| [`me_keepalive_jitter_secs`](#me_keepalive_jitter_secs) | `u64` | `2` | `✘` |
+| [`me_keepalive_payload_random`](#me_keepalive_payload_random) | `bool` | `true` | `✘` |
+| [`rpc_proxy_req_every`](#rpc_proxy_req_every) | `u64` | `0` | `✘` |
+| [`me_writer_cmd_channel_capacity`](#me_writer_cmd_channel_capacity) | `usize` | `4096` | `✘` |
+| [`me_route_channel_capacity`](#me_route_channel_capacity) | `usize` | `768` | `✘` |
+| [`me_c2me_channel_capacity`](#me_c2me_channel_capacity) | `usize` | `1024` | `✘` |
+| [`me_c2me_send_timeout_ms`](#me_c2me_send_timeout_ms) | `u64` | `4000` | `✘` |
+| [`me_reader_route_data_wait_ms`](#me_reader_route_data_wait_ms) | `u64` | `2` | `✔` |
+| [`me_d2c_flush_batch_max_frames`](#me_d2c_flush_batch_max_frames) | `usize` | `32` | `✔` |
+| [`me_d2c_flush_batch_max_bytes`](#me_d2c_flush_batch_max_bytes) | `usize` | `131072` | `✔` |
+| [`me_d2c_flush_batch_max_delay_us`](#me_d2c_flush_batch_max_delay_us) | `u64` | `500` | `✔` |
+| [`me_d2c_ack_flush_immediate`](#me_d2c_ack_flush_immediate) | `bool` | `true` | `✔` |
+| [`me_quota_soft_overshoot_bytes`](#me_quota_soft_overshoot_bytes) | `u64` | `65536` | `✔` |
+| [`me_d2c_frame_buf_shrink_threshold_bytes`](#me_d2c_frame_buf_shrink_threshold_bytes) | `usize` | `262144` | `✔` |
+| [`direct_relay_copy_buf_c2s_bytes`](#direct_relay_copy_buf_c2s_bytes) | `usize` | `65536` | `✔` |
+| [`direct_relay_copy_buf_s2c_bytes`](#direct_relay_copy_buf_s2c_bytes) | `usize` | `262144` | `✔` |
+| [`crypto_pending_buffer`](#crypto_pending_buffer) | `usize` | `262144` | `✘` |
+| [`max_client_frame`](#max_client_frame) | `usize` | `16777216` | `✘` |
+| [`desync_all_full`](#desync_all_full) | `bool` | `false` | `✔` |
+| [`beobachten`](#beobachten) | `bool` | `true` | `✘` |
+| [`beobachten_minutes`](#beobachten_minutes) | `u64` | `10` | `✘` |
+| [`beobachten_flush_secs`](#beobachten_flush_secs) | `u64` | `15` | `✘` |
+| [`beobachten_file`](#beobachten_file) | `String` | `"cache/beobachten.txt"` | `✘` |
+| [`hardswap`](#hardswap) | `bool` | `true` | `✔` |
+| [`me_warmup_stagger_enabled`](#me_warmup_stagger_enabled) | `bool` | `true` | `✘` |
+| [`me_warmup_step_delay_ms`](#me_warmup_step_delay_ms) | `u64` | `500` | `✘` |
+| [`me_warmup_step_jitter_ms`](#me_warmup_step_jitter_ms) | `u64` | `300` | `✘` |
+| [`me_reconnect_max_concurrent_per_dc`](#me_reconnect_max_concurrent_per_dc) | `u32` | `8` | `✘` |
+| [`me_reconnect_backoff_base_ms`](#me_reconnect_backoff_base_ms) | `u64` | `500` | `✘` |
+| [`me_reconnect_backoff_cap_ms`](#me_reconnect_backoff_cap_ms) | `u64` | `30000` | `✘` |
+| [`me_reconnect_fast_retry_count`](#me_reconnect_fast_retry_count) | `u32` | `16` | `✘` |
+| [`me_single_endpoint_shadow_writers`](#me_single_endpoint_shadow_writers) | `u8` | `2` | `✔` |
+| [`me_single_endpoint_outage_mode_enabled`](#me_single_endpoint_outage_mode_enabled) | `bool` | `true` | `✔` |
+| [`me_single_endpoint_outage_disable_quarantine`](#me_single_endpoint_outage_disable_quarantine) | `bool` | `true` | `✔` |
+| [`me_single_endpoint_outage_backoff_min_ms`](#me_single_endpoint_outage_backoff_min_ms) | `u64` | `250` | `✔` |
+| [`me_single_endpoint_outage_backoff_max_ms`](#me_single_endpoint_outage_backoff_max_ms) | `u64` | `3000` | `✔` |
+| [`me_single_endpoint_shadow_rotate_every_secs`](#me_single_endpoint_shadow_rotate_every_secs) | `u64` | `900` | `✔` |
+| [`me_floor_mode`](#me_floor_mode) | `"static"` or `"adaptive"` | `"adaptive"` | `✔` |
+| [`me_adaptive_floor_idle_secs`](#me_adaptive_floor_idle_secs) | `u64` | `90` | `✔` |
+| [`me_adaptive_floor_min_writers_single_endpoint`](#me_adaptive_floor_min_writers_single_endpoint) | `u8` | `1` | `✔` |
+| [`me_adaptive_floor_min_writers_multi_endpoint`](#me_adaptive_floor_min_writers_multi_endpoint) | `u8` | `1` | `✔` |
+| [`me_adaptive_floor_recover_grace_secs`](#me_adaptive_floor_recover_grace_secs) | `u64` | `180` | `✔` |
+| [`me_adaptive_floor_writers_per_core_total`](#me_adaptive_floor_writers_per_core_total) | `u16` | `48` | `✔` |
+| [`me_adaptive_floor_cpu_cores_override`](#me_adaptive_floor_cpu_cores_override) | `u16` | `0` | `✔` |
+| [`me_adaptive_floor_max_extra_writers_single_per_core`](#me_adaptive_floor_max_extra_writers_single_per_core) | `u16` | `1` | `✔` |
+| [`me_adaptive_floor_max_extra_writers_multi_per_core`](#me_adaptive_floor_max_extra_writers_multi_per_core) | `u16` | `2` | `✔` |
+| [`me_adaptive_floor_max_active_writers_per_core`](#me_adaptive_floor_max_active_writers_per_core) | `u16` | `64` | `✔` |
+| [`me_adaptive_floor_max_warm_writers_per_core`](#me_adaptive_floor_max_warm_writers_per_core) | `u16` | `64` | `✔` |
+| [`me_adaptive_floor_max_active_writers_global`](#me_adaptive_floor_max_active_writers_global) | `u32` | `256` | `✔` |
+| [`me_adaptive_floor_max_warm_writers_global`](#me_adaptive_floor_max_warm_writers_global) | `u32` | `256` | `✔` |
+| [`upstream_connect_retry_attempts`](#upstream_connect_retry_attempts) | `u32` | `2` | `✘` |
+| [`upstream_connect_retry_backoff_ms`](#upstream_connect_retry_backoff_ms) | `u64` | `100` | `✘` |
+| [`upstream_connect_budget_ms`](#upstream_connect_budget_ms) | `u64` | `3000` | `✘` |
+| [`tg_connect`](#tg_connect) | `u64` | `10` | `✘` |
+| [`upstream_unhealthy_fail_threshold`](#upstream_unhealthy_fail_threshold) | `u32` | `5` | `✘` |
+| [`upstream_connect_failfast_hard_errors`](#upstream_connect_failfast_hard_errors) | `bool` | `false` | `✘` |
+| [`stun_iface_mismatch_ignore`](#stun_iface_mismatch_ignore) | `bool` | `false` | `✘` |
+| [`unknown_dc_log_path`](#unknown_dc_log_path) | `String` | `"unknown-dc.txt"` | `✘` |
+| [`unknown_dc_file_log_enabled`](#unknown_dc_file_log_enabled) | `bool` | `false` | `✘` |
+| [`log_level`](#log_level) | `"debug"`, `"verbose"`, `"normal"`, or `"silent"` | `"normal"` | `✔` |
+| [`disable_colors`](#disable_colors) | `bool` | `false` | `✘` |
+| [`me_socks_kdf_policy`](#me_socks_kdf_policy) | `"strict"` or `"compat"` | `"strict"` | `✔` |
+| [`me_route_backpressure_enabled`](#me_route_backpressure_enabled) | `bool` | `false` | `✔` |
+| [`me_route_fairshare_enabled`](#me_route_fairshare_enabled) | `bool` | `false` | `✔` |
+| [`me_route_backpressure_base_timeout_ms`](#me_route_backpressure_base_timeout_ms) | `u64` | `25` | `✔` |
+| [`me_route_backpressure_high_timeout_ms`](#me_route_backpressure_high_timeout_ms) | `u64` | `120` | `✔` |
+| [`me_route_backpressure_high_watermark_pct`](#me_route_backpressure_high_watermark_pct) | `u8` | `80` | `✔` |
+| [`me_health_interval_ms_unhealthy`](#me_health_interval_ms_unhealthy) | `u64` | `1000` | `✔` |
+| [`me_health_interval_ms_healthy`](#me_health_interval_ms_healthy) | `u64` | `3000` | `✔` |
+| [`me_admission_poll_ms`](#me_admission_poll_ms) | `u64` | `1000` | `✔` |
+| [`me_warn_rate_limit_ms`](#me_warn_rate_limit_ms) | `u64` | `5000` | `✔` |
+| [`me_route_no_writer_mode`](#me_route_no_writer_mode) | `"async_recovery_failfast"`, `"inline_recovery_legacy"`, or `"hybrid_async_persistent"` | `"hybrid_async_persistent"` | `✘` |
+| [`me_route_no_writer_wait_ms`](#me_route_no_writer_wait_ms) | `u64` | `250` | `✘` |
+| [`me_route_hybrid_max_wait_ms`](#me_route_hybrid_max_wait_ms) | `u64` | `3000` | `✘` |
+| [`me_route_blocking_send_timeout_ms`](#me_route_blocking_send_timeout_ms) | `u64` | `250` | `✘` |
+| [`me_route_inline_recovery_attempts`](#me_route_inline_recovery_attempts) | `u32` | `3` | `✘` |
+| [`me_route_inline_recovery_wait_ms`](#me_route_inline_recovery_wait_ms) | `u64` | `3000` | `✘` |
+| [`fast_mode_min_tls_record`](#fast_mode_min_tls_record) | `usize` | `0` | `✘` |
+| [`update_every`](#update_every) | `u64` | `300` | `✔` |
+| [`me_reinit_every_secs`](#me_reinit_every_secs) | `u64` | `900` | `✔` |
+| [`me_hardswap_warmup_delay_min_ms`](#me_hardswap_warmup_delay_min_ms) | `u64` | `1000` | `✔` |
+| [`me_hardswap_warmup_delay_max_ms`](#me_hardswap_warmup_delay_max_ms) | `u64` | `2000` | `✔` |
+| [`me_hardswap_warmup_extra_passes`](#me_hardswap_warmup_extra_passes) | `u8` | `3` | `✔` |
+| [`me_hardswap_warmup_pass_backoff_base_ms`](#me_hardswap_warmup_pass_backoff_base_ms) | `u64` | `500` | `✔` |
+| [`me_config_stable_snapshots`](#me_config_stable_snapshots) | `u8` | `2` | `✔` |
+| [`me_config_apply_cooldown_secs`](#me_config_apply_cooldown_secs) | `u64` | `300` | `✔` |
+| [`me_snapshot_require_http_2xx`](#me_snapshot_require_http_2xx) | `bool` | `true` | `✔` |
+| [`me_snapshot_reject_empty_map`](#me_snapshot_reject_empty_map) | `bool` | `true` | `✔` |
+| [`me_snapshot_min_proxy_for_lines`](#me_snapshot_min_proxy_for_lines) | `u32` | `1` | `✔` |
+| [`proxy_secret_stable_snapshots`](#proxy_secret_stable_snapshots) | `u8` | `2` | `✔` |
+| [`proxy_secret_rotate_runtime`](#proxy_secret_rotate_runtime) | `bool` | `true` | `✔` |
+| [`me_secret_atomic_snapshot`](#me_secret_atomic_snapshot) | `bool` | `true` | `✔` |
+| [`proxy_secret_len_max`](#proxy_secret_len_max) | `usize` | `256` | `✔` |
+| [`me_pool_drain_ttl_secs`](#me_pool_drain_ttl_secs) | `u64` | `90` | `✔` |
+| [`me_instadrain`](#me_instadrain) | `bool` | `false` | `✔` |
+| [`me_pool_drain_threshold`](#me_pool_drain_threshold) | `u64` | `32` | `✔` |
+| [`me_pool_drain_soft_evict_enabled`](#me_pool_drain_soft_evict_enabled) | `bool` | `true` | `✘` |
+| [`me_pool_drain_soft_evict_grace_secs`](#me_pool_drain_soft_evict_grace_secs) | `u64` | `10` | `✘` |
+| [`me_pool_drain_soft_evict_per_writer`](#me_pool_drain_soft_evict_per_writer) | `u8` | `2` | `✘` |
+| [`me_pool_drain_soft_evict_budget_per_core`](#me_pool_drain_soft_evict_budget_per_core) | `u16` | `16` | `✘` |
+| [`me_pool_drain_soft_evict_cooldown_ms`](#me_pool_drain_soft_evict_cooldown_ms) | `u64` | `1000` | `✘` |
+| [`me_bind_stale_mode`](#me_bind_stale_mode) | `"never"`, `"ttl"`, or `"always"` | `"ttl"` | `✔` |
+| [`me_bind_stale_ttl_secs`](#me_bind_stale_ttl_secs) | `u64` | `90` | `✔` |
+| [`me_pool_min_fresh_ratio`](#me_pool_min_fresh_ratio) | `f32` | `0.8` | `✔` |
+| [`me_reinit_drain_timeout_secs`](#me_reinit_drain_timeout_secs) | `u64` | `90` | `✔` |
+| [`proxy_secret_auto_reload_secs`](#proxy_secret_auto_reload_secs) | `u64` | `3600` | `✔` |
+| [`proxy_config_auto_reload_secs`](#proxy_config_auto_reload_secs) | `u64` | `3600` | `✔` |
+| [`me_reinit_singleflight`](#me_reinit_singleflight) | `bool` | `true` | `✔` |
+| [`me_reinit_trigger_channel`](#me_reinit_trigger_channel) | `usize` | `64` | `✘` |
+| [`me_reinit_coalesce_window_ms`](#me_reinit_coalesce_window_ms) | `u64` | `200` | `✔` |
+| [`me_deterministic_writer_sort`](#me_deterministic_writer_sort) | `bool` | `true` | `✔` |
+| [`me_writer_pick_mode`](#me_writer_pick_mode) | `"sorted_rr"` or `"p2c"` | `"p2c"` | `✔` |
+| [`me_writer_pick_sample_size`](#me_writer_pick_sample_size) | `u8` | `3` | `✔` |
+| [`ntp_check`](#ntp_check) | `bool` | `true` | `✘` |
+| [`ntp_servers`](#ntp_servers) | `String[]` | `["pool.ntp.org"]` | `✘` |
+| [`auto_degradation_enabled`](#auto_degradation_enabled) | `bool` | `true` | `✘` |
+| [`degradation_min_unavailable_dc_groups`](#degradation_min_unavailable_dc_groups) | `u8` | `2` | `✘` |
+| [`rst_on_close`](#rst_on_close) | `"off"`, `"errors"`, or `"always"` | `"off"` | `✘` |

 ## data_path
  - **Constraints / validation**: `String` (optional).
@@ -228,6 +241,24 @@ This document lists all configuration keys accepted by `config.toml`.
    [general]
    data_path = "/var/lib/telemt"
    ```
+## quota_state_path
+  - **Constraints / validation**: `Path`. Relative paths are resolved from the process working directory.
+  - **Description**: JSON state file used to persist runtime per-user quota consumption.
+  - **Example**:
+
+    ```toml
+    [general]
+    quota_state_path = "telemt.limit.json"
+    ```
+## config_strict
+  - **Constraints / validation**: `bool`.
+  - **Description**: Rejects unknown TOML keys during config load. Startup fails fast; hot-reload rejects the new snapshot and keeps the current config.
+  - **Example**:
+
+    ```toml
+    [general]
+    config_strict = true
+    ```
 ## prefer_ipv6
  - **Constraints / validation**: Deprecated. Use `network.prefer`.
  - **Description**: Deprecated legacy IPv6 preference flag migrated to `network.prefer`.
@@ -392,7 +423,7 @@ This document lists all configuration keys accepted by `config.toml`.
    ```
 ## me2dc_fallback
  - **Constraints / validation**: `bool`.
-  - **Description**: Allows fallback from ME mode to direct DC when ME startup fails.
+  - **Description**: Allows Direct-DC fallback when ME is unavailable. With `use_middle_proxy = true`, startup opens Direct-DC routing first and moves new sessions to ME after ME readiness is observed.
  - **Example**:

    ```toml
@@ -401,14 +432,14 @@ This document lists all configuration keys accepted by `config.toml`.
    ```
 ## me2dc_fast
  - **Constraints / validation**: `bool`. Active only when `use_middle_proxy = true` and `me2dc_fallback = true`.
-  - **Description**: Fast ME->Direct fallback mode for new sessions.
+  - **Description**: Fast ME->Direct fallback mode for new sessions after ME was ready at least once. Initial direct-first startup fallback is controlled by `me2dc_fallback`.
  - **Example**:

    ```toml
    [general]
    use_middle_proxy = true
    me2dc_fallback = true
-    me2dc_fast = false
+    me2dc_fast = true
    ```
 ## me_keepalive_enabled
  - **Constraints / validation**: `bool`.
@@ -601,7 +632,7 @@ This document lists all configuration keys accepted by `config.toml`.
    ```
 ## beobachten
  - **Constraints / validation**: `bool`.
-  - **Description**: Enables per-IP forensic observation buckets.
+  - **Description**: Enables per-IP forensic observation buckets and appends TLS JA3/JA4 fingerprint snapshots to Beobachten output when available.
  - **Example**:

    ```toml
@@ -610,7 +641,7 @@ This document lists all configuration keys accepted by `config.toml`.
    ```
 ## beobachten_minutes
  - **Constraints / validation**: Must be `> 0` (minutes).
-  - **Description**: Retention window (minutes) for per-IP observation buckets.
+  - **Description**: Retention window (minutes) for per-IP observation buckets and in-memory TLS fingerprint buckets.
  - **Example**:

    ```toml
@@ -905,6 +936,15 @@ This document lists all configuration keys accepted by `config.toml`.
    [general]
    upstream_connect_budget_ms = 3000
    ```
+## tg_connect
+  - **Constraints / validation**: Must be `> 0` (seconds).
+  - **Description**: Upstream Telegram connect timeout.
+  - **Example**:
+
+    ```toml
+    [general]
+    tg_connect = 10
+    ```
 ## upstream_unhealthy_fail_threshold
  - **Constraints / validation**: Must be `> 0`.
  - **Description**: Consecutive failed requests before upstream is marked unhealthy.
@@ -1520,11 +1560,11 @@ This document lists all configuration keys accepted by `config.toml`.
 # [general.modes]


-| Key | Type | Default |
-| --- | ---- | ------- |
-| [`classic`](#classic) | `bool` | `false` |
-| [`secure`](#secure) | `bool` | `false` |
-| [`tls`](#tls) | `bool` | `true` |
+| Key | Type | Default | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`classic`](#classic) | `bool` | `false` | `✘` |
+| [`secure`](#secure) | `bool` | `false` | `✘` |
+| [`tls`](#tls) | `bool` | `true` | `✘` |

 ## classic
  - **Constraints / validation**: `bool`.
@@ -1558,11 +1598,11 @@ This document lists all configuration keys accepted by `config.toml`.
 # [general.links]


-| Key | Type | Default |
-| --- | ---- | ------- |
-| [`show`](#show) | `"*"` or `String[]` | `"*"` |
-| [`public_host`](#public_host) | `String` | — |
-| [`public_port`](#public_port) | `u16` | — |
+| Key | Type | Default | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`show`](#show) | `"*"` or `String[]` | `"*"` | `✘` |
+| [`public_host`](#public_host) | `String` | — | `✘` |
+| [`public_port`](#public_port) | `u16` | — | `✘` |

 ## show
  - **Constraints / validation**: `"*"` or `String[]`. An empty array means "show none".
@@ -1598,11 +1638,11 @@ This document lists all configuration keys accepted by `config.toml`.
 # [general.telemetry]


-| Key | Type | Default |
-| --- | ---- | ------- |
-| [`core_enabled`](#core_enabled) | `bool` | `true` |
-| [`user_enabled`](#user_enabled) | `bool` | `true` |
-| [`me_level`](#me_level) | `"silent"`, `"normal"`, or `"debug"` | `"normal"` |
+| Key | Type | Default | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`core_enabled`](#core_enabled) | `bool` | `true` | `✔` |
+| [`user_enabled`](#user_enabled) | `bool` | `true` | `✔` |
+| [`me_level`](#me_level) | `"silent"`, `"normal"`, or `"debug"` | `"normal"` | `✔` |

 ## core_enabled
  - **Constraints / validation**: `bool`.
@@ -1636,18 +1676,18 @@ This document lists all configuration keys accepted by `config.toml`.
 # [network]


-| Key | Type | Default |
-| --- | ---- | ------- |
-| [`ipv4`](#ipv4) | `bool` | `true` |
-| [`ipv6`](#ipv6) | `bool` | `false` |
-| [`prefer`](#prefer) | `u8` | `4` |
-| [`multipath`](#multipath) | `bool` | `false` |
-| [`stun_use`](#stun_use) | `bool` | `true` |
-| [`stun_servers`](#stun_servers) | `String[]` | Built-in STUN list (13 hosts) |
-| [`stun_tcp_fallback`](#stun_tcp_fallback) | `bool` | `true` |
-| [`http_ip_detect_urls`](#http_ip_detect_urls) | `String[]` | `["https://ifconfig.me/ip", "https://api.ipify.org"]` |
-| [`cache_public_ip_path`](#cache_public_ip_path) | `String` | `"cache/public_ip.txt"` |
-| [`dns_overrides`](#dns_overrides) | `String[]` | `[]` |
+| Key | Type | Default | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`ipv4`](#ipv4) | `bool` | `true` | `✘` |
+| [`ipv6`](#ipv6) | `bool` | `false` | `✘` |
+| [`prefer`](#prefer) | `u8` | `4` | `✘` |
+| [`multipath`](#multipath) | `bool` | `false` | `✘` |
+| [`stun_use`](#stun_use) | `bool` | `true` | `✘` |
+| [`stun_servers`](#stun_servers) | `String[]` | Built-in STUN list (13 hosts) | `✘` |
+| [`stun_tcp_fallback`](#stun_tcp_fallback) | `bool` | `true` | `✘` |
+| [`http_ip_detect_urls`](#http_ip_detect_urls) | `String[]` | `["https://ifconfig.me/ip", "https://api.ipify.org"]` | `✘` |
+| [`cache_public_ip_path`](#cache_public_ip_path) | `String` | `"cache/public_ip.txt"` | `✘` |
+| [`dns_overrides`](#dns_overrides) | `String[]` | `[]` | `✔` |

 ## ipv4
  - **Constraints / validation**: `bool`.
@@ -1757,23 +1797,28 @@ This document lists all configuration keys accepted by `config.toml`.
 # [server]


-| Key | Type | Default |
-| --- | ---- | ------- |
-| [`port`](#port) | `u16` | `443` |
-| [`listen_addr_ipv4`](#listen_addr_ipv4) | `String` | `"0.0.0.0"` |
-| [`listen_addr_ipv6`](#listen_addr_ipv6) | `String` | `"::"` |
-| [`listen_unix_sock`](#listen_unix_sock) | `String` | — |
-| [`listen_unix_sock_perm`](#listen_unix_sock_perm) | `String` | — |
-| [`listen_tcp`](#listen_tcp) | `bool` | — (auto) |
-| [`proxy_protocol`](#proxy_protocol) | `bool` | `false` |
-| [`proxy_protocol_header_timeout_ms`](#proxy_protocol_header_timeout_ms) | `u64` | `500` |
-| [`proxy_protocol_trusted_cidrs`](#proxy_protocol_trusted_cidrs) | `IpNetwork[]` | `[]` |
-| [`metrics_port`](#metrics_port) | `u16` | — |
-| [`metrics_listen`](#metrics_listen) | `String` | — |
-| [`metrics_whitelist`](#metrics_whitelist) | `IpNetwork[]` | `["127.0.0.1/32", "::1/128"]` |
-| [`max_connections`](#max_connections) | `u32` | `10000` |
-| [`accept_permit_timeout_ms`](#accept_permit_timeout_ms) | `u64` | `250` |
-| [`listen_backlog`](#listen_backlog) | `u32` | `1024` |
+| Key | Type | Default | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`port`](#port) | `u16` | `443` | `✘` |
+| [`listen_addr_ipv4`](#listen_addr_ipv4) | `String` | `"0.0.0.0"` | `✘` |
+| [`listen_addr_ipv6`](#listen_addr_ipv6) | `String` | `"::"` | `✘` |
+| [`listen_unix_sock`](#listen_unix_sock) | `String` | — | `✘` |
+| [`listen_unix_sock_perm`](#listen_unix_sock_perm) | `String` | — | `✘` |
+| [`listen_tcp`](#listen_tcp) | `bool` | — (auto) | `✘` |
+| [`client_mss`](#client_mss) | `String` | `""` | `✘` |
+| [`proxy_protocol`](#proxy_protocol) | `bool` | `false` | `✘` |
+| [`proxy_protocol_header_timeout_ms`](#proxy_protocol_header_timeout_ms) | `u64` | `500` | `✘` |
+| [`proxy_protocol_trusted_cidrs`](#proxy_protocol_trusted_cidrs) | `IpNetwork[]` | `[]` | `✘` |
+| [`metrics_port`](#metrics_port) | `u16` | — | `✘` |
+| [`metrics_listen`](#metrics_listen) | `String` | — | `✘` |
+| [`metrics_whitelist`](#metrics_whitelist) | `IpNetwork[]` | `["127.0.0.1/32", "::1/128"]` | `✘` |
+| [`api`](#serverapi) | `Table` | built-in defaults | `✘` |
+| [`admin_api`](#serverapi) | `Table` | alias for `api` | `✘` |
+| [`listeners`](#serverlisteners) | `Table[]` | derived from legacy listener fields | `✘` |
+| [`max_connections`](#max_connections) | `u32` | `10000` | `✘` |
+| [`accept_permit_timeout_ms`](#accept_permit_timeout_ms) | `u64` | `250` | `✘` |
+| [`listen_backlog`](#listen_backlog) | `u32` | `1024` | `✘` |
+| [`conntrack_control`](#serverconntrack_control) | `Table` | built-in defaults | `✘` |

 ## port
  - **Constraints / validation**: `u16`.
@@ -1843,6 +1888,16 @@ This document lists all configuration keys accepted by `config.toml`.
    listen_unix_sock = "/run/telemt.sock"
    listen_tcp = true
    ```
+## client_mss
+  - **Constraints / validation**: `String`. Empty or omitted means do not change kernel MSS. Presets: `"extreme-low"` = `88`, `"tspu"` = `92`, `"2in8"` = `256`. Custom decimal strings must be within `88..=4096`.
+  - **Description**: Client-facing TCP MSS applied to TCP listener sockets before `listen(2)`, so Linux can announce it in SYN/ACK. This affects only proxy client TCP listeners, not API, metrics, Unix sockets, Telegram upstreams, ME sockets, or mask backend connections. Changes require listener restart/rebind.
+  - **Performance note**: Low MSS increases packet count predictably. Approximate segment multiplier is `ceil(1460 / client_mss)`.
+  - **Example**:
+
+    ```toml
+    [server]
+    client_mss = "tspu"
+    ```
 ## proxy_protocol
  - **Constraints / validation**: `bool`.
  - **Description**: Enables HAProxy PROXY protocol parsing on incoming connections (PROXY v1/v2). When enabled, client source address is taken from the PROXY header.
@@ -1930,16 +1985,16 @@ Note: When `server.proxy_protocol` is enabled, incoming PROXY protocol headers a
 Note: The conntrack-control worker runs **only on Linux**. On other operating systems it is not started; if `inline_conntrack_control` is `true`, a warning is logged. Effective operation also requires **CAP_NET_ADMIN** and a usable backend (`nft` or `iptables` / `ip6tables` on `PATH`). The `conntrack` utility is used for optional table entry deletes under pressure.


-| Key | Type | Default |
-| --- | ---- | ------- |
-| [`inline_conntrack_control`](#inline_conntrack_control) | `bool` | `true` |
-| [`mode`](#mode) | `String` | `"tracked"` |
-| [`backend`](#backend) | `String` | `"auto"` |
-| [`profile`](#profile) | `String` | `"balanced"` |
-| [`hybrid_listener_ips`](#hybrid_listener_ips) | `IpAddr[]` | `[]` |
-| [`pressure_high_watermark_pct`](#pressure_high_watermark_pct) | `u8` | `85` |
-| [`pressure_low_watermark_pct`](#pressure_low_watermark_pct) | `u8` | `70` |
-| [`delete_budget_per_sec`](#delete_budget_per_sec) | `u64` | `4096` |
+| Key | Type | Default | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`inline_conntrack_control`](#inline_conntrack_control) | `bool` | `true` | `✘` |
+| [`mode`](#mode) | `String` | `"tracked"` | `✘` |
+| [`backend`](#backend) | `String` | `"auto"` | `✘` |
+| [`profile`](#profile) | `String` | `"balanced"` | `✘` |
+| [`hybrid_listener_ips`](#hybrid_listener_ips) | `IpAddr[]` | `[]` | `✘` |
+| [`pressure_high_watermark_pct`](#pressure_high_watermark_pct) | `u8` | `85` | `✘` |
+| [`pressure_low_watermark_pct`](#pressure_low_watermark_pct) | `u8` | `70` | `✘` |
+| [`delete_budget_per_sec`](#delete_budget_per_sec) | `u64` | `4096` | `✘` |

 ## inline_conntrack_control
  - **Constraints / validation**: `bool`.
@@ -2021,21 +2076,21 @@ Note: The conntrack-control worker runs **only on Linux**. On other operating sy
 Note: This section also accepts the legacy alias `[server.admin_api]` (same schema as `[server.api]`).


-| Key | Type | Default |
-| --- | ---- | ------- |
-| [`enabled`](#enabled) | `bool` | `true` |
-| [`listen`](#listen) | `String` | `"0.0.0.0:9091"` |
-| [`whitelist`](#whitelist) | `IpNetwork[]` | `["127.0.0.0/8"]` |
-| [`auth_header`](#auth_header) | `String` | `""` |
-| [`request_body_limit_bytes`](#request_body_limit_bytes) | `usize` | `65536` |
-| [`minimal_runtime_enabled`](#minimal_runtime_enabled) | `bool` | `true` |
-| [`minimal_runtime_cache_ttl_ms`](#minimal_runtime_cache_ttl_ms) | `u64` | `1000` |
-| [`runtime_edge_enabled`](#runtime_edge_enabled) | `bool` | `false` |
-| [`runtime_edge_cache_ttl_ms`](#runtime_edge_cache_ttl_ms) | `u64` | `1000` |
-| [`runtime_edge_top_n`](#runtime_edge_top_n) | `usize` | `10` |
-| [`runtime_edge_events_capacity`](#runtime_edge_events_capacity) | `usize` | `256` |
-| [`read_only`](#read_only) | `bool` | `false` |
-| [`gray_action`](#gray_action) | `"drop"`, `"api"`, or `"200"` | `"drop"` |
+| Key | Type | Default | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`enabled`](#enabled) | `bool` | `true` | `✘` |
+| [`listen`](#listen) | `String` | `"0.0.0.0:9091"` | `✘` |
+| [`whitelist`](#whitelist) | `IpNetwork[]` | `["127.0.0.0/8"]` | `✘` |
+| [`auth_header`](#auth_header) | `String` | `""` | `✘` |
+| [`request_body_limit_bytes`](#request_body_limit_bytes) | `usize` | `65536` | `✘` |
+| [`minimal_runtime_enabled`](#minimal_runtime_enabled) | `bool` | `true` | `✘` |
+| [`minimal_runtime_cache_ttl_ms`](#minimal_runtime_cache_ttl_ms) | `u64` | `1000` | `✘` |
+| [`runtime_edge_enabled`](#runtime_edge_enabled) | `bool` | `false` | `✘` |
+| [`runtime_edge_cache_ttl_ms`](#runtime_edge_cache_ttl_ms) | `u64` | `1000` | `✘` |
+| [`runtime_edge_top_n`](#runtime_edge_top_n) | `usize` | `10` | `✘` |
+| [`runtime_edge_events_capacity`](#runtime_edge_events_capacity) | `usize` | `256` | `✘` |
+| [`read_only`](#read_only) | `bool` | `false` | `✘` |
+| [`gray_action`](#gray_action) | `"drop"`, `"api"`, or `"200"` | `"drop"` | `✘` |

 ## enabled
  - **Constraints / validation**: `bool`.
@@ -2129,7 +2184,7 @@ Note: This section also accepts the legacy alias `[server.admin_api]` (same sche
    ```
 ## runtime_edge_top_n
  - **Constraints / validation**: `1..=1000`.
-  - **Description**: Top-N size for edge connection leaderboard.
+  - **Description**: Top-N size for edge connection and TLS fingerprint leaderboard snapshots.
  - **Example**:

    ```toml
@@ -2159,13 +2214,15 @@ Note: This section also accepts the legacy alias `[server.admin_api]` (same sche
 # [[server.listeners]]


-| Key | Type | Default |
-| --- | ---- | ------- |
-| [`ip`](#ip) | `IpAddr` | — |
-| [`announce`](#announce) | `String` | — |
-| [`announce_ip`](#announce_ip) | `IpAddr` | — |
-| [`proxy_protocol`](#proxy_protocol) | `bool` | — |
-| [`reuse_allow`](#reuse_allow) | `bool` | `false` |
+| Key | Type | Default | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`ip`](#ip) | `IpAddr` | — | `✘` |
+| [`port`](#port-serverlisteners) | `u16` | `server.port` | `✘` |
+| [`client_mss`](#client_mss-serverlisteners) | `String` | `[server].client_mss` | `✘` |
+| [`announce`](#announce) | `String` | — | `✘` |
+| [`announce_ip`](#announce_ip) | `IpAddr` | — | `✘` |
+| [`proxy_protocol`](#proxy_protocol) | `bool` | — | `✘` |
+| [`reuse_allow`](#reuse_allow) | `bool` | `false` | `✘` |

 ## ip
  - **Constraints / validation**: Required field. Must be an `IpAddr`.
@@ -2176,6 +2233,27 @@ Note: This section also accepts the legacy alias `[server.admin_api]` (same sche
    [[server.listeners]]
    ip = "0.0.0.0"
    ```
+## port (server.listeners)
+  - **Constraints / validation**: `u16` (optional). When omitted, falls back to `server.port`.
+  - **Description**: Per-listener TCP port.
+  - **Example**:
+
+    ```toml
+    [[server.listeners]]
+    ip = "0.0.0.0"
+    port = 443
+    ```
+## client_mss (server.listeners)
+  - **Constraints / validation**: `String` (optional). Same values as `[server].client_mss`.
+  - **Description**: Per-listener MSS override. When omitted, inherits `[server].client_mss`; when set to an empty string, disables MSS shaping for this listener even if the global value is set. Changes require listener restart/rebind.
+  - **Example**:
+
+    ```toml
+    [[server.listeners]]
+    ip = "0.0.0.0"
+    port = 443
+    client_mss = "256"
+    ```
 ## announce
  - **Constraints / validation**: `String` (optional). Must not be empty when set.
  - **Description**: Public IP/domain announced in proxy links for this listener. Takes precedence over `announce_ip`.
@@ -2209,8 +2287,7 @@ Note: This section also accepts the legacy alias `[server.admin_api]` (same sche
    ip = "0.0.0.0"
    proxy_protocol = true
    ```
-## reuse_allow"
- `reuse_allow`
+## reuse_allow
  - **Constraints / validation**: `bool`.
  - **Description**: Enables `SO_REUSEPORT` for multi-instance bind sharing (allows multiple telemt instances to listen on the same `ip:port`).
  - **Example**:
@@ -2225,18 +2302,18 @@ Note: This section also accepts the legacy alias `[server.admin_api]` (same sche
 # [timeouts]


-| Key | Type | Default |
-| --- | ---- | ------- |
-| [`client_handshake`](#client_handshake) | `u64` | `30` |
-| [`relay_idle_policy_v2_enabled`](#relay_idle_policy_v2_enabled) | `bool` | `true` |
-| [`relay_client_idle_soft_secs`](#relay_client_idle_soft_secs) | `u64` | `120` |
-| [`relay_client_idle_hard_secs`](#relay_client_idle_hard_secs) | `u64` | `360` |
-| [`relay_idle_grace_after_downstream_activity_secs`](#relay_idle_grace_after_downstream_activity_secs) | `u64` | `30` |
-| [`tg_connect`](#tg_connect) | `u64` | `10` |
-| [`client_keepalive`](#client_keepalive) | `u64` | `15` |
-| [`client_ack`](#client_ack) | `u64` | `90` |
-| [`me_one_retry`](#me_one_retry) | `u8` | `12` |
-| [`me_one_timeout_ms`](#me_one_timeout_ms) | `u64` | `1200` |
+| Key | Type | Default | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`client_first_byte_idle_secs`](#client_first_byte_idle_secs) | `u64` | `300` | `✘` |
+| [`client_handshake`](#client_handshake) | `u64` | `30` | `✘` |
+| [`relay_idle_policy_v2_enabled`](#relay_idle_policy_v2_enabled) | `bool` | `true` | `✘` |
+| [`relay_client_idle_soft_secs`](#relay_client_idle_soft_secs) | `u64` | `120` | `✘` |
+| [`relay_client_idle_hard_secs`](#relay_client_idle_hard_secs) | `u64` | `360` | `✘` |
+| [`relay_idle_grace_after_downstream_activity_secs`](#relay_idle_grace_after_downstream_activity_secs) | `u64` | `30` | `✘` |
+| [`client_keepalive`](#client_keepalive) | `u64` | `15` | `✘` |
+| [`client_ack`](#client_ack) | `u64` | `90` | `✘` |
+| [`me_one_retry`](#me_one_retry) | `u8` | `12` | `✘` |
+| [`me_one_timeout_ms`](#me_one_timeout_ms) | `u64` | `1200` | `✘` |

 ## client_handshake
  - **Constraints / validation**: Must be `> 0`. Value is in seconds. Also used as an upper bound for some TLS emulation delays (see `censorship.server_hello_delay_max_ms`).
@@ -2292,15 +2369,6 @@ Note: This section also accepts the legacy alias `[server.admin_api]` (same sche
    [timeouts]
    relay_idle_grace_after_downstream_activity_secs = 30
    ```
-## tg_connect
-  - **Constraints / validation**: `u64`. Value is in seconds.
-  - **Description**: Upstream Telegram connect timeout (seconds).
-  - **Example**:
-
-    ```toml
-    [timeouts]
-    tg_connect = 10
-    ```
 ## client_keepalive
  - **Constraints / validation**: `u64`. Value is in seconds.
  - **Description**: Client keepalive timeout (seconds).
@@ -2342,40 +2410,40 @@ Note: This section also accepts the legacy alias `[server.admin_api]` (same sche
 # [censorship]


-| Key | Type | Default |
-| --- | ---- | ------- |
-| [`tls_domain`](#tls_domain) | `String` | `"petrovich.ru"` |
-| [`tls_domains`](#tls_domains) | `String[]` | `[]` |
-| [`unknown_sni_action`](#unknown_sni_action) | `"drop"`, `"mask"`, `"accept"`, `"reject_handshake"` | `"drop"` |
-| [`tls_fetch_scope`](#tls_fetch_scope) | `String` | `""` |
-| [`tls_fetch`](#tls_fetch) | `Table` | built-in defaults |
-| [`mask`](#mask) | `bool` | `true` |
-| [`mask_host`](#mask_host) | `String` | — |
-| [`mask_port`](#mask_port) | `u16` | `443` |
-| [`mask_unix_sock`](#mask_unix_sock) | `String` | — |
-| [`fake_cert_len`](#fake_cert_len) | `usize` | `2048` |
-| [`tls_emulation`](#tls_emulation) | `bool` | `true` |
-| [`tls_front_dir`](#tls_front_dir) | `String` | `"tlsfront"` |
-| [`server_hello_delay_min_ms`](#server_hello_delay_min_ms) | `u64` | `0` |
-| [`server_hello_delay_max_ms`](#server_hello_delay_max_ms) | `u64` | `0` |
-| [`tls_new_session_tickets`](#tls_new_session_tickets) | `u8` | `0` |
-| [`tls_full_cert_ttl_secs`](#tls_full_cert_ttl_secs) | `u64` | `90` |
-| [`serverhello_compact`](#serverhello_compact) | `bool` | `false` |
-| [`alpn_enforce`](#alpn_enforce) | `bool` | `true` |
-| [`mask_proxy_protocol`](#mask_proxy_protocol) | `u8` | `0` |
-| [`mask_shape_hardening`](#mask_shape_hardening) | `bool` | `true` |
-| [`mask_shape_hardening_aggressive_mode`](#mask_shape_hardening_aggressive_mode) | `bool` | `false` |
-| [`mask_shape_bucket_floor_bytes`](#mask_shape_bucket_floor_bytes) | `usize` | `512` |
-| [`mask_shape_bucket_cap_bytes`](#mask_shape_bucket_cap_bytes) | `usize` | `4096` |
-| [`mask_shape_above_cap_blur`](#mask_shape_above_cap_blur) | `bool` | `false` |
-| [`mask_shape_above_cap_blur_max_bytes`](#mask_shape_above_cap_blur_max_bytes) | `usize` | `512` |
-| [`mask_relay_max_bytes`](#mask_relay_max_bytes) | `usize` | `5242880` |
-| [`mask_relay_timeout_ms`](#mask_relay_timeout_ms) | `u64` | `60_000` |
-| [`mask_relay_idle_timeout_ms`](#mask_relay_idle_timeout_ms) | `u64` | `5_000` |
-| [`mask_classifier_prefetch_timeout_ms`](#mask_classifier_prefetch_timeout_ms) | `u64` | `5` |
-| [`mask_timing_normalization_enabled`](#mask_timing_normalization_enabled) | `bool` | `false` |
-| [`mask_timing_normalization_floor_ms`](#mask_timing_normalization_floor_ms) | `u64` | `0` |
-| [`mask_timing_normalization_ceiling_ms`](#mask_timing_normalization_ceiling_ms) | `u64` | `0` |
+| Key | Type | Default | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`tls_domain`](#tls_domain) | `String` | `"petrovich.ru"` | `✘` |
+| [`tls_domains`](#tls_domains) | `String[]` | `[]` | `✘` |
+| [`unknown_sni_action`](#unknown_sni_action) | `"drop"`, `"mask"`, `"accept"`, `"reject_handshake"` | `"drop"` | `✘` |
+| [`tls_fetch_scope`](#tls_fetch_scope) | `String` | `""` | `✘` |
+| [`tls_fetch`](#tls_fetch) | `Table` | built-in defaults | `✘` |
+| [`mask`](#mask) | `bool` | `true` | `✘` |
+| [`mask_host`](#mask_host) | `String` | — | `✘` |
+| [`mask_port`](#mask_port) | `u16` | `443` | `✘` |
+| [`mask_unix_sock`](#mask_unix_sock) | `String` | — | `✘` |
+| [`fake_cert_len`](#fake_cert_len) | `usize` | `2048` | `✘` |
+| [`tls_emulation`](#tls_emulation) | `bool` | `true` | `✘` |
+| [`tls_front_dir`](#tls_front_dir) | `String` | `"tlsfront"` | `✘` |
+| [`server_hello_delay_min_ms`](#server_hello_delay_min_ms) | `u64` | `0` | `✘` |
+| [`server_hello_delay_max_ms`](#server_hello_delay_max_ms) | `u64` | `0` | `✘` |
+| [`tls_new_session_tickets`](#tls_new_session_tickets) | `u8` | `0` | `✘` |
+| [`tls_full_cert_ttl_secs`](#tls_full_cert_ttl_secs) | `u64` | `90` | `✘` |
+| [`serverhello_compact`](#serverhello_compact) | `bool` | `false` | `✘` |
+| [`alpn_enforce`](#alpn_enforce) | `bool` | `true` | `✘` |
+| [`mask_proxy_protocol`](#mask_proxy_protocol) | `u8` | `0` | `✘` |
+| [`mask_shape_hardening`](#mask_shape_hardening) | `bool` | `true` | `✘` |
+| [`mask_shape_hardening_aggressive_mode`](#mask_shape_hardening_aggressive_mode) | `bool` | `false` | `✘` |
+| [`mask_shape_bucket_floor_bytes`](#mask_shape_bucket_floor_bytes) | `usize` | `512` | `✘` |
+| [`mask_shape_bucket_cap_bytes`](#mask_shape_bucket_cap_bytes) | `usize` | `4096` | `✘` |
+| [`mask_shape_above_cap_blur`](#mask_shape_above_cap_blur) | `bool` | `false` | `✘` |
+| [`mask_shape_above_cap_blur_max_bytes`](#mask_shape_above_cap_blur_max_bytes) | `usize` | `512` | `✘` |
+| [`mask_relay_max_bytes`](#mask_relay_max_bytes) | `usize` | `5242880` | `✘` |
+| [`mask_relay_timeout_ms`](#mask_relay_timeout_ms) | `u64` | `60_000` | `✘` |
+| [`mask_relay_idle_timeout_ms`](#mask_relay_idle_timeout_ms) | `u64` | `5_000` | `✘` |
+| [`mask_classifier_prefetch_timeout_ms`](#mask_classifier_prefetch_timeout_ms) | `u64` | `5` | `✘` |
+| [`mask_timing_normalization_enabled`](#mask_timing_normalization_enabled) | `bool` | `false` | `✘` |
+| [`mask_timing_normalization_floor_ms`](#mask_timing_normalization_floor_ms) | `u64` | `0` | `✘` |
+| [`mask_timing_normalization_ceiling_ms`](#mask_timing_normalization_ceiling_ms) | `u64` | `0` | `✘` |

 ## tls_domain
  - **Constraints / validation**: Must be a non-empty domain name. Must not contain spaces or `/`.
@@ -2459,6 +2527,18 @@ Note: This section also accepts the legacy alias `[server.admin_api]` (same sche
    [censorship]
    mask_port = 443
    ```
+## exclusive_mask
+  - **Constraints / validation**: TOML map. Keys must be SNI domain names. Values must be `host:port` with `port > 0`; IPv6 literals must be bracketed.
+  - **Description**: Per-SNI TCP mask targets for fallback traffic. When a TLS ClientHello SNI matches a key, Telemt relays that unauthenticated connection to the mapped target. Other fallback traffic keeps using the existing `mask_host`/`mask_port` or SNI-aware default masking behavior.
+  - **Example**:
+
+    ```toml
+    [censorship]
+    tls_domains = ["petrovich.ru", "bsi.bund.de", "telekom.com"]
+
+    [censorship.exclusive_mask]
+    "bsi.bund.de" = "127.0.0.1:443"
+    ```
 ## mask_unix_sock
  - **Constraints / validation**: `String` (optional).
    - Must not be empty when set.
@@ -2797,15 +2877,15 @@ If your backend or network is very bandwidth-constrained, reduce cap first. If p
 # [censorship.tls_fetch]


-| Key | Type | Default |
-| --- | ---- | ------- |
-| [`profiles`](#profiles) | `String[]` | `["modern_chrome_like", "modern_firefox_like", "compat_tls12", "legacy_minimal"]` |
-| [`strict_route`](#strict_route) | `bool` | `true` |
-| [`attempt_timeout_ms`](#attempt_timeout_ms) | `u64` | `5000` |
-| [`total_budget_ms`](#total_budget_ms) | `u64` | `15000` |
-| [`grease_enabled`](#grease_enabled) | `bool` | `false` |
-| [`deterministic`](#deterministic) | `bool` | `false` |
-| [`profile_cache_ttl_secs`](#profile_cache_ttl_secs) | `u64` | `600` |
+| Key | Type | Default | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`profiles`](#profiles) | `String[]` | `["modern_chrome_like", "modern_firefox_like", "compat_tls12", "legacy_minimal"]` | `✘` |
+| [`strict_route`](#strict_route) | `bool` | `true` | `✘` |
+| [`attempt_timeout_ms`](#attempt_timeout_ms) | `u64` | `5000` | `✘` |
+| [`total_budget_ms`](#total_budget_ms) | `u64` | `15000` | `✘` |
+| [`grease_enabled`](#grease_enabled) | `bool` | `false` | `✘` |
+| [`deterministic`](#deterministic) | `bool` | `false` | `✘` |
+| [`profile_cache_ttl_secs`](#profile_cache_ttl_secs) | `u64` | `600` | `✘` |

 ## profiles
  - **Constraints / validation**: `String[]`. Empty list falls back to defaults; values are deduplicated preserving order.
@@ -2874,24 +2954,25 @@ If your backend or network is very bandwidth-constrained, reduce cap first. If p
 # [access]


-| Key | Type | Default |
-| --- | ---- | ------- |
-| [`users`](#users) | `Map<String, String>` | `{"default": "000…000"}` |
-| [`user_ad_tags`](#user_ad_tags) | `Map<String, String>` | `{}` |
-| [`user_max_tcp_conns`](#user_max_tcp_conns) | `Map<String, usize>` | `{}` |
-| [`user_max_tcp_conns_global_each`](#user_max_tcp_conns_global_each) | `usize` | `0` |
-| [`user_expirations`](#user_expirations) | `Map<String, DateTime<Utc>>` | `{}` |
-| [`user_data_quota`](#user_data_quota) | `Map<String, u64>` | `{}` |
-| [`user_max_unique_ips`](#user_max_unique_ips) | `Map<String, usize>` | `{}` |
-| [`user_max_unique_ips_global_each`](#user_max_unique_ips_global_each) | `usize` | `0` |
-| [`user_max_unique_ips_mode`](#user_max_unique_ips_mode) | `"active_window"`, `"time_window"`, or `"combined"` | `"active_window"` |
-| [`user_max_unique_ips_window_secs`](#user_max_unique_ips_window_secs) | `u64` | `30` |
-| [`user_source_deny`](#user_source_deny) | `Map<String, IpNetwork[]>` | `{}` |
-| [`replay_check_len`](#replay_check_len) | `usize` | `65536` |
-| [`replay_window_secs`](#replay_window_secs) | `u64` | `120` |
-| [`ignore_time_skew`](#ignore_time_skew) | `bool` | `false` |
-| [`user_rate_limits`](#user_rate_limits) | `Map<String, RateLimitBps>` | `{}` |
-| [`cidr_rate_limits`](#cidr_rate_limits) | `Map<IpNetwork, RateLimitBps>` | `{}` |
+| Key | Type | Default | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`users`](#users) | `Map<String, String>` | `{"default": "000…000"}` | `✔` |
+| [`user_enabled`](#user_enabled-1) | `Map<String, bool>` | `{}` | `✔` |
+| [`user_ad_tags`](#user_ad_tags) | `Map<String, String>` | `{}` | `✔` |
+| [`user_max_tcp_conns`](#user_max_tcp_conns) | `Map<String, usize>` | `{}` | `✔` |
+| [`user_max_tcp_conns_global_each`](#user_max_tcp_conns_global_each) | `usize` | `0` | `✔` |
+| [`user_expirations`](#user_expirations) | `Map<String, DateTime<Utc>>` | `{}` | `✔` |
+| [`user_data_quota`](#user_data_quota) | `Map<String, u64>` | `{}` | `✔` |
+| [`user_max_unique_ips`](#user_max_unique_ips) | `Map<String, usize>` | `{}` | `✔` |
+| [`user_max_unique_ips_global_each`](#user_max_unique_ips_global_each) | `usize` | `0` | `✔` |
+| [`user_max_unique_ips_mode`](#user_max_unique_ips_mode) | `"active_window"`, `"time_window"`, or `"combined"` | `"active_window"` | `✔` |
+| [`user_max_unique_ips_window_secs`](#user_max_unique_ips_window_secs) | `u64` | `30` | `✔` |
+| [`user_source_deny`](#user_source_deny) | `Map<String, IpNetwork[]>` | `{}` | `✘` |
+| [`replay_check_len`](#replay_check_len) | `usize` | `65536` | `✘` |
+| [`replay_window_secs`](#replay_window_secs) | `u64` | `120` | `✘` |
+| [`ignore_time_skew`](#ignore_time_skew) | `bool` | `false` | `✘` |
+| [`user_rate_limits`](#user_rate_limits) | `Map<String, RateLimitBps>` | `{}` | `✔` |
+| [`cidr_rate_limits`](#cidr_rate_limits) | `Map<IpNetwork, RateLimitBps>` | `{}` | `✔` |

 ## users
  - **Constraints / validation**: Must not be empty (at least one user must exist). Each value must be **exactly 32 hex characters**.
@@ -2903,6 +2984,16 @@ If your backend or network is very bandwidth-constrained, reduce cap first. If p
    alice = "00112233445566778899aabbccddeeff"
    bob   = "0123456789abcdef0123456789abcdef"
    ```
+## user_enabled
+  - **Constraints / validation**: `Map<String, bool>`.
+  - **Description**: Optional per-user enable overrides. Missing users are enabled by default. A value of `false` disables new sessions for that user; setting the value to `true` is accepted but equivalent to removing the override. API enable operations remove the override, while disable operations write `false`.
+  - **Runtime behavior**: Hot reload applies this map immediately. Users disabled through API or config reload are rejected after successful authentication and active runtime sessions for that username are cancelled.
+  - **Example**:
+
+    ```toml
+    [access.user_enabled]
+    alice = false
+    ```
 ## user_ad_tags
  - **Constraints / validation**: Each value must be **exactly 32 hex characters** (same format as `general.ad_tag`). An all-zero tag is allowed but logs a warning.
  - **Description**: Per-user sponsored-channel ad tag override. When a user has an entry here, it takes precedence over `general.ad_tag`.
@@ -3055,19 +3146,24 @@ If your backend or network is very bandwidth-constrained, reduce cap first. If p
 # [[upstreams]]


-| Key | Type | Default |
-| --- | ---- | ------- |
-| [`type`](#type) | `"direct"`, `"socks4"`, `"socks5"`, or `"shadowsocks"` | — |
-| [`weight`](#weight) | `u16` | `1` |
-| [`enabled`](#enabled) | `bool` | `true` |
-| [`scopes`](#scopes) | `String` | `""` |
-| [`interface`](#interface) | `String` | — |
-| [`bind_addresses`](#bind_addresses) | `String[]` | — |
-| [`url`](#url) | `String` | — |
-| [`address`](#address) | `String` | — |
-| [`user_id`](#user_id) | `String` | — |
-| [`username`](#username) | `String` | — |
-| [`password`](#password) | `String` | — |
+| Key | Type | Default | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`type`](#type) | `"direct"`, `"socks4"`, `"socks5"`, or `"shadowsocks"` | — | `✘` |
+| [`weight`](#weight) | `u16` | `1` | `✘` |
+| [`enabled`](#enabled) | `bool` | `true` | `✘` |
+| [`scopes`](#scopes) | `String` | `""` | `✘` |
+| [`ipv4`](#ipv4-upstreams) | `bool` | — (auto) | `✘` |
+| [`ipv6`](#ipv6-upstreams) | `bool` | — (auto) | `✘` |
+| [`prefer`](#prefer-upstreams) | `4` or `6` | effective `[network].prefer` | `✘` |
+| [`interface`](#interface) | `String` | — | `✘` |
+| [`bind_addresses`](#bind_addresses) | `String[]` | — | `✘` |
+| [`bindtodevice`](#bindtodevice) | `String` | — | `✘` |
+| [`force_bind`](#force_bind) | `String` | — | `✘` |
+| [`url`](#url) | `String` | — | `✘` |
+| [`address`](#address) | `String` | — | `✘` |
+| [`user_id`](#user_id) | `String` | — | `✘` |
+| [`username`](#username) | `String` | — | `✘` |
+| [`password`](#password) | `String` | — | `✘` |

 ## type
  - **Constraints / validation**: Required field. Must be one of: `"direct"`, `"socks4"`, `"socks5"`, `"shadowsocks"`.
@@ -3118,6 +3214,38 @@ If your backend or network is very bandwidth-constrained, reduce cap first. If p
    address = "10.0.0.10:1080"
    scopes = "me, fetch, dc2"
    ```
+## ipv4 (upstreams)
+  - **Constraints / validation**: `bool` (optional).
+  - **Description**: Allows IPv4 DC targets for this upstream. When omitted, Telemt auto-detects support from runtime connectivity state.
+  - **Example**:
+
+    ```toml
+    [[upstreams]]
+    type = "direct"
+    ipv4 = true
+    ```
+## ipv6 (upstreams)
+  - **Constraints / validation**: `bool` (optional).
+  - **Description**: Allows IPv6 DC targets for this upstream. When omitted, Telemt auto-detects support from runtime connectivity state. Set this to `true` when the upstream proxy is reachable from the local host over IPv4 but the proxy itself can connect to Telegram DCs over IPv6.
+  - **Example**:
+
+    ```toml
+    [[upstreams]]
+    type = "direct"
+    ipv6 = false
+    ```
+## prefer (upstreams)
+  - **Constraints / validation**: Optional integer. Must be `4` or `6`.
+  - **Description**: Overrides the IP family preference for Telegram DC targets selected through this upstream. When omitted, the upstream inherits the effective global `[network].prefer` decision. Use `prefer = 6` together with `ipv6 = true` for a SOCKS or Shadowsocks upstream that can egress over IPv6 even when the local Telemt host is IPv4-only.
+  - **Example**:
+
+    ```toml
+    [[upstreams]]
+    type = "socks5"
+    address = "192.0.2.10:1080"
+    ipv6 = true
+    prefer = 6
+    ```
 ## interface
  - **Constraints / validation**: `String` (optional).
    - For `"direct"`: may be an IP address (used as explicit local bind) or an OS interface name (resolved to an IP at runtime; Unix only).
@@ -3148,6 +3276,26 @@ If your backend or network is very bandwidth-constrained, reduce cap first. If p
    type = "direct"
    bind_addresses = ["192.0.2.10", "192.0.2.11"]
    ```
+## bindtodevice
+  - **Constraints / validation**: `String` (optional). Applies only to `type = "direct"` and is Linux-only.
+  - **Description**: Hard interface pinning via `SO_BINDTODEVICE` for outgoing direct TCP connects.
+  - **Example**:
+
+    ```toml
+    [[upstreams]]
+    type = "direct"
+    bindtodevice = "eth0"
+    ```
+## force_bind
+  - **Constraints / validation**: `String` (optional). Alias for `bindtodevice`.
+  - **Description**: Backward-compatible alias for Linux `SO_BINDTODEVICE` hard interface pinning.
+  - **Example**:
+
+    ```toml
+    [[upstreams]]
+    type = "direct"
+    force_bind = "eth0"
+    ```
 ## url
  - **Constraints / validation**: Applies only to `type = "shadowsocks"`.
    - Must be a valid Shadowsocks URL accepted by the `shadowsocks` crate.
@@ -10,6 +10,8 @@
 >
 > Параметры конфигурации, подробно описанные в этом документе, предназначены для опытных пользователей и для целей тонкой настройки. Изменение этих параметров без четкого понимания их функции может привести к нестабильности приложения или другому неожиданному поведению. Пожалуйста, действуйте осторожно и на свой страх и риск.

+> `Hot-Reload` показывает, применяет ли config watcher изменение без перезапуска процесса; `✘` означает, что для runtime-эффекта нужен перезапуск.
+
 # Содержание
 - [Ключи верхнего уровня](#top-level-keys)
 - [general](#general)
@@ -29,12 +31,16 @@

 # Ключи верхнего уровня

-| Ключ | Тип | По умолчанию |
-| --- | ---- | ------- |
-| [`include`](#include) | `String` (специальная директива) | — |
-| [`show_link`](#show_link) | `"*"` or `String[]` | `[]` (`ShowLink::None`) |
-| [`dc_overrides`](#dc_overrides) | `Map<String, String or String[]>` | `{}` |
-| [`default_dc`](#default_dc) | `u8` | — (эффективный резервный вариант: `2` в ME маршрутизации) |
+| Ключ | Тип | По умолчанию | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`include`](#include) | `String` (специальная директива) | — | `✔` |
+| [`show_link`](#show_link) | `"*"` or `String[]` | `[]` (`ShowLink::None`) | `✘` |
+| [`dc_overrides`](#dc_overrides) | `Map<String, String or String[]>` | `{}` | `✘` |
+| [`default_dc`](#default_dc) | `u8` | — (эффективный резервный вариант: `2` в ME маршрутизации) | `✘` |
+| [`beobachten`](#beobachten) | `bool` | `true` | `✘` |
+| [`beobachten_minutes`](#beobachten_minutes) | `u64` | `10` | `✘` |
+| [`beobachten_flush_secs`](#beobachten_flush_secs) | `u64` | `15` | `✘` |
+| [`beobachten_file`](#beobachten_file) | `String` | `"cache/beobachten.txt"` | `✘` |

 ## include
  - **Ограничения / валидация**: значение должно быть одной строкой в виде `include = "path/to/file.toml"`. Значения параметра обрабатываются перед анализом TOML. Максимальное количество - 10.
@@ -79,145 +85,152 @@

 # [general]

-| Ключ | Тип | По умолчанию |
-| --- | ---- | ------- |
-| [`data_path`](#data_path) | `String` | — |
-| [`prefer_ipv6`](#prefer_ipv6) | `bool` | `false` |
-| [`fast_mode`](#fast_mode) | `bool` | `true` |
-| [`use_middle_proxy`](#use_middle_proxy) | `bool` | `true` |
-| [`proxy_secret_path`](#proxy_secret_path) | `String` | `"proxy-secret"` |
-| [`proxy_config_v4_cache_path`](#proxy_config_v4_cache_path) | `String` | `"cache/proxy-config-v4.txt"` |
-| [`proxy_config_v6_cache_path`](#proxy_config_v6_cache_path) | `String` | `"cache/proxy-config-v6.txt"` |
-| [`ad_tag`](#ad_tag) | `String` | — |
-| [`middle_proxy_nat_ip`](#middle_proxy_nat_ip) | `IpAddr` | — |
-| [`middle_proxy_nat_probe`](#middle_proxy_nat_probe) | `bool` | `true` |
-| [`middle_proxy_nat_stun`](#middle_proxy_nat_stun) | `String` | — |
-| [`middle_proxy_nat_stun_servers`](#middle_proxy_nat_stun_servers) | `String[]` | `[]` |
-| [`stun_nat_probe_concurrency`](#stun_nat_probe_concurrency) | `usize` | `8` |
-| [`middle_proxy_pool_size`](#middle_proxy_pool_size) | `usize` | `8` |
-| [`middle_proxy_warm_standby`](#middle_proxy_warm_standby) | `usize` | `16` |
-| [`me_init_retry_attempts`](#me_init_retry_attempts) | `u32` | `0` |
-| [`me2dc_fallback`](#me2dc_fallback) | `bool` | `true` |
-| [`me2dc_fast`](#me2dc_fast) | `bool` | `false` |
-| [`me_keepalive_enabled`](#me_keepalive_enabled) | `bool` | `true` |
-| [`me_keepalive_interval_secs`](#me_keepalive_interval_secs) | `u64` | `8` |
-| [`me_keepalive_jitter_secs`](#me_keepalive_jitter_secs) | `u64` | `2` |
-| [`me_keepalive_payload_random`](#me_keepalive_payload_random) | `bool` | `true` |
-| [`rpc_proxy_req_every`](#rpc_proxy_req_every) | `u64` | `0` |
-| [`me_writer_cmd_channel_capacity`](#me_writer_cmd_channel_capacity) | `usize` | `4096` |
-| [`me_route_channel_capacity`](#me_route_channel_capacity) | `usize` | `768` |
-| [`me_c2me_channel_capacity`](#me_c2me_channel_capacity) | `usize` | `1024` |
-| [`me_c2me_send_timeout_ms`](#me_c2me_send_timeout_ms) | `u64` | `4000` |
-| [`me_reader_route_data_wait_ms`](#me_reader_route_data_wait_ms) | `u64` | `2` |
-| [`me_d2c_flush_batch_max_frames`](#me_d2c_flush_batch_max_frames) | `usize` | `32` |
-| [`me_d2c_flush_batch_max_bytes`](#me_d2c_flush_batch_max_bytes) | `usize` | `131072` |
-| [`me_d2c_flush_batch_max_delay_us`](#me_d2c_flush_batch_max_delay_us) | `u64` | `500` |
-| [`me_d2c_ack_flush_immediate`](#me_d2c_ack_flush_immediate) | `bool` | `true` |
-| [`me_quota_soft_overshoot_bytes`](#me_quota_soft_overshoot_bytes) | `u64` | `65536` |
-| [`me_d2c_frame_buf_shrink_threshold_bytes`](#me_d2c_frame_buf_shrink_threshold_bytes) | `usize` | `262144` |
-| [`direct_relay_copy_buf_c2s_bytes`](#direct_relay_copy_buf_c2s_bytes) | `usize` | `65536` |
-| [`direct_relay_copy_buf_s2c_bytes`](#direct_relay_copy_buf_s2c_bytes) | `usize` | `262144` |
-| [`crypto_pending_buffer`](#crypto_pending_buffer) | `usize` | `262144` |
-| [`max_client_frame`](#max_client_frame) | `usize` | `16777216` |
-| [`desync_all_full`](#desync_all_full) | `bool` | `false` |
-| [`beobachten`](#beobachten) | `bool` | `true` |
-| [`beobachten_minutes`](#beobachten_minutes) | `u64` | `10` |
-| [`beobachten_flush_secs`](#beobachten_flush_secs) | `u64` | `15` |
-| [`beobachten_file`](#beobachten_file) | `String` | `"cache/beobachten.txt"` |
-| [`hardswap`](#hardswap) | `bool` | `true` |
-| [`me_warmup_stagger_enabled`](#me_warmup_stagger_enabled) | `bool` | `true` |
-| [`me_warmup_step_delay_ms`](#me_warmup_step_delay_ms) | `u64` | `500` |
-| [`me_warmup_step_jitter_ms`](#me_warmup_step_jitter_ms) | `u64` | `300` |
-| [`me_reconnect_max_concurrent_per_dc`](#me_reconnect_max_concurrent_per_dc) | `u32` | `8` |
-| [`me_reconnect_backoff_base_ms`](#me_reconnect_backoff_base_ms) | `u64` | `500` |
-| [`me_reconnect_backoff_cap_ms`](#me_reconnect_backoff_cap_ms) | `u64` | `30000` |
-| [`me_reconnect_fast_retry_count`](#me_reconnect_fast_retry_count) | `u32` | `16` |
-| [`me_single_endpoint_shadow_writers`](#me_single_endpoint_shadow_writers) | `u8` | `2` |
-| [`me_single_endpoint_outage_mode_enabled`](#me_single_endpoint_outage_mode_enabled) | `bool` | `true` |
-| [`me_single_endpoint_outage_disable_quarantine`](#me_single_endpoint_outage_disable_quarantine) | `bool` | `true` |
-| [`me_single_endpoint_outage_backoff_min_ms`](#me_single_endpoint_outage_backoff_min_ms) | `u64` | `250` |
-| [`me_single_endpoint_outage_backoff_max_ms`](#me_single_endpoint_outage_backoff_max_ms) | `u64` | `3000` |
-| [`me_single_endpoint_shadow_rotate_every_secs`](#me_single_endpoint_shadow_rotate_every_secs) | `u64` | `900` |
-| [`me_floor_mode`](#me_floor_mode) | `"static"` or `"adaptive"` | `"adaptive"` |
-| [`me_adaptive_floor_idle_secs`](#me_adaptive_floor_idle_secs) | `u64` | `90` |
-| [`me_adaptive_floor_min_writers_single_endpoint`](#me_adaptive_floor_min_writers_single_endpoint) | `u8` | `1` |
-| [`me_adaptive_floor_min_writers_multi_endpoint`](#me_adaptive_floor_min_writers_multi_endpoint) | `u8` | `1` |
-| [`me_adaptive_floor_recover_grace_secs`](#me_adaptive_floor_recover_grace_secs) | `u64` | `180` |
-| [`me_adaptive_floor_writers_per_core_total`](#me_adaptive_floor_writers_per_core_total) | `u16` | `48` |
-| [`me_adaptive_floor_cpu_cores_override`](#me_adaptive_floor_cpu_cores_override) | `u16` | `0` |
-| [`me_adaptive_floor_max_extra_writers_single_per_core`](#me_adaptive_floor_max_extra_writers_single_per_core) | `u16` | `1` |
-| [`me_adaptive_floor_max_extra_writers_multi_per_core`](#me_adaptive_floor_max_extra_writers_multi_per_core) | `u16` | `2` |
-| [`me_adaptive_floor_max_active_writers_per_core`](#me_adaptive_floor_max_active_writers_per_core) | `u16` | `64` |
-| [`me_adaptive_floor_max_warm_writers_per_core`](#me_adaptive_floor_max_warm_writers_per_core) | `u16` | `64` |
-| [`me_adaptive_floor_max_active_writers_global`](#me_adaptive_floor_max_active_writers_global) | `u32` | `256` |
-| [`me_adaptive_floor_max_warm_writers_global`](#me_adaptive_floor_max_warm_writers_global) | `u32` | `256` |
-| [`upstream_connect_retry_attempts`](#upstream_connect_retry_attempts) | `u32` | `2` |
-| [`upstream_connect_retry_backoff_ms`](#upstream_connect_retry_backoff_ms) | `u64` | `100` |
-| [`upstream_connect_budget_ms`](#upstream_connect_budget_ms) | `u64` | `3000` |
-| [`upstream_unhealthy_fail_threshold`](#upstream_unhealthy_fail_threshold) | `u32` | `5` |
-| [`upstream_connect_failfast_hard_errors`](#upstream_connect_failfast_hard_errors) | `bool` | `false` |
-| [`stun_iface_mismatch_ignore`](#stun_iface_mismatch_ignore) | `bool` | `false` |
-| [`unknown_dc_log_path`](#unknown_dc_log_path) | `String` | `"unknown-dc.txt"` |
-| [`unknown_dc_file_log_enabled`](#unknown_dc_file_log_enabled) | `bool` | `false` |
-| [`log_level`](#log_level) | `"debug"`, `"verbose"`, `"normal"`, or `"silent"` | `"normal"` |
-| [`disable_colors`](#disable_colors) | `bool` | `false` |
-| [`me_socks_kdf_policy`](#me_socks_kdf_policy) | `"strict"` or `"compat"` | `"strict"` |
-| [`me_route_backpressure_enabled`](#me_route_backpressure_enabled) | `bool` | `false` |
-| [`me_route_fairshare_enabled`](#me_route_fairshare_enabled) | `bool` | `false` |
-| [`me_route_backpressure_base_timeout_ms`](#me_route_backpressure_base_timeout_ms) | `u64` | `25` |
-| [`me_route_backpressure_high_timeout_ms`](#me_route_backpressure_high_timeout_ms) | `u64` | `120` |
-| [`me_route_backpressure_high_watermark_pct`](#me_route_backpressure_high_watermark_pct) | `u8` | `80` |
-| [`me_health_interval_ms_unhealthy`](#me_health_interval_ms_unhealthy) | `u64` | `1000` |
-| [`me_health_interval_ms_healthy`](#me_health_interval_ms_healthy) | `u64` | `3000` |
-| [`me_admission_poll_ms`](#me_admission_poll_ms) | `u64` | `1000` |
-| [`me_warn_rate_limit_ms`](#me_warn_rate_limit_ms) | `u64` | `5000` |
-| [`me_route_no_writer_mode`](#me_route_no_writer_mode) | `"async_recovery_failfast"`, `"inline_recovery_legacy"`, or `"hybrid_async_persistent"` | `"hybrid_async_persistent"` |
-| [`me_route_no_writer_wait_ms`](#me_route_no_writer_wait_ms) | `u64` | `250` |
-| [`me_route_hybrid_max_wait_ms`](#me_route_hybrid_max_wait_ms) | `u64` | `3000` |
-| [`me_route_blocking_send_timeout_ms`](#me_route_blocking_send_timeout_ms) | `u64` | `250` |
-| [`me_route_inline_recovery_attempts`](#me_route_inline_recovery_attempts) | `u32` | `3` |
-| [`me_route_inline_recovery_wait_ms`](#me_route_inline_recovery_wait_ms) | `u64` | `3000` |
-| [`fast_mode_min_tls_record`](#fast_mode_min_tls_record) | `usize` | `0` |
-| [`update_every`](#update_every) | `u64` | `300` |
-| [`me_reinit_every_secs`](#me_reinit_every_secs) | `u64` | `900` |
-| [`me_hardswap_warmup_delay_min_ms`](#me_hardswap_warmup_delay_min_ms) | `u64` | `1000` |
-| [`me_hardswap_warmup_delay_max_ms`](#me_hardswap_warmup_delay_max_ms) | `u64` | `2000` |
-| [`me_hardswap_warmup_extra_passes`](#me_hardswap_warmup_extra_passes) | `u8` | `3` |
-| [`me_hardswap_warmup_pass_backoff_base_ms`](#me_hardswap_warmup_pass_backoff_base_ms) | `u64` | `500` |
-| [`me_config_stable_snapshots`](#me_config_stable_snapshots) | `u8` | `2` |
-| [`me_config_apply_cooldown_secs`](#me_config_apply_cooldown_secs) | `u64` | `300` |
-| [`me_snapshot_require_http_2xx`](#me_snapshot_require_http_2xx) | `bool` | `true` |
-| [`me_snapshot_reject_empty_map`](#me_snapshot_reject_empty_map) | `bool` | `true` |
-| [`me_snapshot_min_proxy_for_lines`](#me_snapshot_min_proxy_for_lines) | `u32` | `1` |
-| [`proxy_secret_stable_snapshots`](#proxy_secret_stable_snapshots) | `u8` | `2` |
-| [`proxy_secret_rotate_runtime`](#proxy_secret_rotate_runtime) | `bool` | `true` |
-| [`me_secret_atomic_snapshot`](#me_secret_atomic_snapshot) | `bool` | `true` |
-| [`proxy_secret_len_max`](#proxy_secret_len_max) | `usize` | `256` |
-| [`me_pool_drain_ttl_secs`](#me_pool_drain_ttl_secs) | `u64` | `90` |
-| [`me_instadrain`](#me_instadrain) | `bool` | `false` |
-| [`me_pool_drain_threshold`](#me_pool_drain_threshold) | `u64` | `32` |
-| [`me_pool_drain_soft_evict_enabled`](#me_pool_drain_soft_evict_enabled) | `bool` | `true` |
-| [`me_pool_drain_soft_evict_grace_secs`](#me_pool_drain_soft_evict_grace_secs) | `u64` | `10` |
-| [`me_pool_drain_soft_evict_per_writer`](#me_pool_drain_soft_evict_per_writer) | `u8` | `2` |
-| [`me_pool_drain_soft_evict_budget_per_core`](#me_pool_drain_soft_evict_budget_per_core) | `u16` | `16` |
-| [`me_pool_drain_soft_evict_cooldown_ms`](#me_pool_drain_soft_evict_cooldown_ms) | `u64` | `1000` |
-| [`me_bind_stale_mode`](#me_bind_stale_mode) | `"never"`, `"ttl"`, or `"always"` | `"ttl"` |
-| [`me_bind_stale_ttl_secs`](#me_bind_stale_ttl_secs) | `u64` | `90` |
-| [`me_pool_min_fresh_ratio`](#me_pool_min_fresh_ratio) | `f32` | `0.8` |
-| [`me_reinit_drain_timeout_secs`](#me_reinit_drain_timeout_secs) | `u64` | `90` |
-| [`proxy_secret_auto_reload_secs`](#proxy_secret_auto_reload_secs) | `u64` | `3600` |
-| [`proxy_config_auto_reload_secs`](#proxy_config_auto_reload_secs) | `u64` | `3600` |
-| [`me_reinit_singleflight`](#me_reinit_singleflight) | `bool` | `true` |
-| [`me_reinit_trigger_channel`](#me_reinit_trigger_channel) | `usize` | `64` |
-| [`me_reinit_coalesce_window_ms`](#me_reinit_coalesce_window_ms) | `u64` | `200` |
-| [`me_deterministic_writer_sort`](#me_deterministic_writer_sort) | `bool` | `true` |
-| [`me_writer_pick_mode`](#me_writer_pick_mode) | `"sorted_rr"` or `"p2c"` | `"p2c"` |
-| [`me_writer_pick_sample_size`](#me_writer_pick_sample_size) | `u8` | `3` |
-| [`ntp_check`](#ntp_check) | `bool` | `true` |
-| [`ntp_servers`](#ntp_servers) | `String[]` | `["pool.ntp.org"]` |
-| [`auto_degradation_enabled`](#auto_degradation_enabled) | `bool` | `true` |
-| [`degradation_min_unavailable_dc_groups`](#degradation_min_unavailable_dc_groups) | `u8` | `2` |
-| [`rst_on_close`](#rst_on_close) | `"off"`, `"errors"` или `"always"` | `"off"` |
+
+| Ключ | Тип | По умолчанию | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`data_path`](#data_path) | `String` | — | `✘` |
+| [`quota_state_path`](#quota_state_path) | `Path` | `"telemt.limit.json"` | `✘` |
+| [`config_strict`](#config_strict) | `bool` | `false` | `✘` |
+| [`prefer_ipv6`](#prefer_ipv6) | `bool` | `false` | `✘` |
+| [`fast_mode`](#fast_mode) | `bool` | `true` | `✘` |
+| [`use_middle_proxy`](#use_middle_proxy) | `bool` | `true` | `✘` |
+| [`proxy_secret_path`](#proxy_secret_path) | `String` | `"proxy-secret"` | `✘` |
+| [`proxy_secret_url`](#proxy_secret_url) | `String` | `"https://core.telegram.org/getProxySecret"` | `✘` |
+| [`proxy_config_v4_cache_path`](#proxy_config_v4_cache_path) | `String` | `"cache/proxy-config-v4.txt"` | `✘` |
+| [`proxy_config_v4_url`](#proxy_config_v4_url) | `String` | `"https://core.telegram.org/getProxyConfig"` | `✘` |
+| [`proxy_config_v6_cache_path`](#proxy_config_v6_cache_path) | `String` | `"cache/proxy-config-v6.txt"` | `✘` |
+| [`proxy_config_v6_url`](#proxy_config_v6_url) | `String` | `"https://core.telegram.org/getProxyConfigV6"` | `✘` |
+| [`ad_tag`](#ad_tag) | `String` | — | `✔` |
+| [`middle_proxy_nat_ip`](#middle_proxy_nat_ip) | `IpAddr` | — | `✘` |
+| [`middle_proxy_nat_probe`](#middle_proxy_nat_probe) | `bool` | `true` | `✘` |
+| [`middle_proxy_nat_stun`](#middle_proxy_nat_stun) | `String` | — | `✘` |
+| [`middle_proxy_nat_stun_servers`](#middle_proxy_nat_stun_servers) | `String[]` | `[]` | `✘` |
+| [`stun_nat_probe_concurrency`](#stun_nat_probe_concurrency) | `usize` | `8` | `✘` |
+| [`middle_proxy_pool_size`](#middle_proxy_pool_size) | `usize` | `8` | `✘` |
+| [`middle_proxy_warm_standby`](#middle_proxy_warm_standby) | `usize` | `16` | `✘` |
+| [`me_init_retry_attempts`](#me_init_retry_attempts) | `u32` | `0` | `✘` |
+| [`me2dc_fallback`](#me2dc_fallback) | `bool` | `true` | `✘` |
+| [`me2dc_fast`](#me2dc_fast) | `bool` | `false` | `✘` |
+| [`me_keepalive_enabled`](#me_keepalive_enabled) | `bool` | `true` | `✘` |
+| [`me_keepalive_interval_secs`](#me_keepalive_interval_secs) | `u64` | `8` | `✘` |
+| [`me_keepalive_jitter_secs`](#me_keepalive_jitter_secs) | `u64` | `2` | `✘` |
+| [`me_keepalive_payload_random`](#me_keepalive_payload_random) | `bool` | `true` | `✘` |
+| [`rpc_proxy_req_every`](#rpc_proxy_req_every) | `u64` | `0` | `✘` |
+| [`me_writer_cmd_channel_capacity`](#me_writer_cmd_channel_capacity) | `usize` | `4096` | `✘` |
+| [`me_route_channel_capacity`](#me_route_channel_capacity) | `usize` | `768` | `✘` |
+| [`me_c2me_channel_capacity`](#me_c2me_channel_capacity) | `usize` | `1024` | `✘` |
+| [`me_c2me_send_timeout_ms`](#me_c2me_send_timeout_ms) | `u64` | `4000` | `✘` |
+| [`me_reader_route_data_wait_ms`](#me_reader_route_data_wait_ms) | `u64` | `2` | `✔` |
+| [`me_d2c_flush_batch_max_frames`](#me_d2c_flush_batch_max_frames) | `usize` | `32` | `✔` |
+| [`me_d2c_flush_batch_max_bytes`](#me_d2c_flush_batch_max_bytes) | `usize` | `131072` | `✔` |
+| [`me_d2c_flush_batch_max_delay_us`](#me_d2c_flush_batch_max_delay_us) | `u64` | `500` | `✔` |
+| [`me_d2c_ack_flush_immediate`](#me_d2c_ack_flush_immediate) | `bool` | `true` | `✔` |
+| [`me_quota_soft_overshoot_bytes`](#me_quota_soft_overshoot_bytes) | `u64` | `65536` | `✔` |
+| [`me_d2c_frame_buf_shrink_threshold_bytes`](#me_d2c_frame_buf_shrink_threshold_bytes) | `usize` | `262144` | `✔` |
+| [`direct_relay_copy_buf_c2s_bytes`](#direct_relay_copy_buf_c2s_bytes) | `usize` | `65536` | `✔` |
+| [`direct_relay_copy_buf_s2c_bytes`](#direct_relay_copy_buf_s2c_bytes) | `usize` | `262144` | `✔` |
+| [`crypto_pending_buffer`](#crypto_pending_buffer) | `usize` | `262144` | `✘` |
+| [`max_client_frame`](#max_client_frame) | `usize` | `16777216` | `✘` |
+| [`desync_all_full`](#desync_all_full) | `bool` | `false` | `✔` |
+| [`beobachten`](#beobachten) | `bool` | `true` | `✘` |
+| [`beobachten_minutes`](#beobachten_minutes) | `u64` | `10` | `✘` |
+| [`beobachten_flush_secs`](#beobachten_flush_secs) | `u64` | `15` | `✘` |
+| [`beobachten_file`](#beobachten_file) | `String` | `"cache/beobachten.txt"` | `✘` |
+| [`hardswap`](#hardswap) | `bool` | `true` | `✔` |
+| [`me_warmup_stagger_enabled`](#me_warmup_stagger_enabled) | `bool` | `true` | `✘` |
+| [`me_warmup_step_delay_ms`](#me_warmup_step_delay_ms) | `u64` | `500` | `✘` |
+| [`me_warmup_step_jitter_ms`](#me_warmup_step_jitter_ms) | `u64` | `300` | `✘` |
+| [`me_reconnect_max_concurrent_per_dc`](#me_reconnect_max_concurrent_per_dc) | `u32` | `8` | `✘` |
+| [`me_reconnect_backoff_base_ms`](#me_reconnect_backoff_base_ms) | `u64` | `500` | `✘` |
+| [`me_reconnect_backoff_cap_ms`](#me_reconnect_backoff_cap_ms) | `u64` | `30000` | `✘` |
+| [`me_reconnect_fast_retry_count`](#me_reconnect_fast_retry_count) | `u32` | `16` | `✘` |
+| [`me_single_endpoint_shadow_writers`](#me_single_endpoint_shadow_writers) | `u8` | `2` | `✔` |
+| [`me_single_endpoint_outage_mode_enabled`](#me_single_endpoint_outage_mode_enabled) | `bool` | `true` | `✔` |
+| [`me_single_endpoint_outage_disable_quarantine`](#me_single_endpoint_outage_disable_quarantine) | `bool` | `true` | `✔` |
+| [`me_single_endpoint_outage_backoff_min_ms`](#me_single_endpoint_outage_backoff_min_ms) | `u64` | `250` | `✔` |
+| [`me_single_endpoint_outage_backoff_max_ms`](#me_single_endpoint_outage_backoff_max_ms) | `u64` | `3000` | `✔` |
+| [`me_single_endpoint_shadow_rotate_every_secs`](#me_single_endpoint_shadow_rotate_every_secs) | `u64` | `900` | `✔` |
+| [`me_floor_mode`](#me_floor_mode) | `"static"` or `"adaptive"` | `"adaptive"` | `✔` |
+| [`me_adaptive_floor_idle_secs`](#me_adaptive_floor_idle_secs) | `u64` | `90` | `✔` |
+| [`me_adaptive_floor_min_writers_single_endpoint`](#me_adaptive_floor_min_writers_single_endpoint) | `u8` | `1` | `✔` |
+| [`me_adaptive_floor_min_writers_multi_endpoint`](#me_adaptive_floor_min_writers_multi_endpoint) | `u8` | `1` | `✔` |
+| [`me_adaptive_floor_recover_grace_secs`](#me_adaptive_floor_recover_grace_secs) | `u64` | `180` | `✔` |
+| [`me_adaptive_floor_writers_per_core_total`](#me_adaptive_floor_writers_per_core_total) | `u16` | `48` | `✔` |
+| [`me_adaptive_floor_cpu_cores_override`](#me_adaptive_floor_cpu_cores_override) | `u16` | `0` | `✔` |
+| [`me_adaptive_floor_max_extra_writers_single_per_core`](#me_adaptive_floor_max_extra_writers_single_per_core) | `u16` | `1` | `✔` |
+| [`me_adaptive_floor_max_extra_writers_multi_per_core`](#me_adaptive_floor_max_extra_writers_multi_per_core) | `u16` | `2` | `✔` |
+| [`me_adaptive_floor_max_active_writers_per_core`](#me_adaptive_floor_max_active_writers_per_core) | `u16` | `64` | `✔` |
+| [`me_adaptive_floor_max_warm_writers_per_core`](#me_adaptive_floor_max_warm_writers_per_core) | `u16` | `64` | `✔` |
+| [`me_adaptive_floor_max_active_writers_global`](#me_adaptive_floor_max_active_writers_global) | `u32` | `256` | `✔` |
+| [`me_adaptive_floor_max_warm_writers_global`](#me_adaptive_floor_max_warm_writers_global) | `u32` | `256` | `✔` |
+| [`upstream_connect_retry_attempts`](#upstream_connect_retry_attempts) | `u32` | `2` | `✘` |
+| [`upstream_connect_retry_backoff_ms`](#upstream_connect_retry_backoff_ms) | `u64` | `100` | `✘` |
+| [`upstream_connect_budget_ms`](#upstream_connect_budget_ms) | `u64` | `3000` | `✘` |
+| [`tg_connect`](#tg_connect) | `u64` | `10` | `✘` |
+| [`upstream_unhealthy_fail_threshold`](#upstream_unhealthy_fail_threshold) | `u32` | `5` | `✘` |
+| [`upstream_connect_failfast_hard_errors`](#upstream_connect_failfast_hard_errors) | `bool` | `false` | `✘` |
+| [`stun_iface_mismatch_ignore`](#stun_iface_mismatch_ignore) | `bool` | `false` | `✘` |
+| [`unknown_dc_log_path`](#unknown_dc_log_path) | `String` | `"unknown-dc.txt"` | `✘` |
+| [`unknown_dc_file_log_enabled`](#unknown_dc_file_log_enabled) | `bool` | `false` | `✘` |
+| [`log_level`](#log_level) | `"debug"`, `"verbose"`, `"normal"`, or `"silent"` | `"normal"` | `✔` |
+| [`disable_colors`](#disable_colors) | `bool` | `false` | `✘` |
+| [`me_socks_kdf_policy`](#me_socks_kdf_policy) | `"strict"` or `"compat"` | `"strict"` | `✔` |
+| [`me_route_backpressure_enabled`](#me_route_backpressure_enabled) | `bool` | `false` | `✔` |
+| [`me_route_fairshare_enabled`](#me_route_fairshare_enabled) | `bool` | `false` | `✔` |
+| [`me_route_backpressure_base_timeout_ms`](#me_route_backpressure_base_timeout_ms) | `u64` | `25` | `✔` |
+| [`me_route_backpressure_high_timeout_ms`](#me_route_backpressure_high_timeout_ms) | `u64` | `120` | `✔` |
+| [`me_route_backpressure_high_watermark_pct`](#me_route_backpressure_high_watermark_pct) | `u8` | `80` | `✔` |
+| [`me_health_interval_ms_unhealthy`](#me_health_interval_ms_unhealthy) | `u64` | `1000` | `✔` |
+| [`me_health_interval_ms_healthy`](#me_health_interval_ms_healthy) | `u64` | `3000` | `✔` |
+| [`me_admission_poll_ms`](#me_admission_poll_ms) | `u64` | `1000` | `✔` |
+| [`me_warn_rate_limit_ms`](#me_warn_rate_limit_ms) | `u64` | `5000` | `✔` |
+| [`me_route_no_writer_mode`](#me_route_no_writer_mode) | `"async_recovery_failfast"`, `"inline_recovery_legacy"`, or `"hybrid_async_persistent"` | `"hybrid_async_persistent"` | `✘` |
+| [`me_route_no_writer_wait_ms`](#me_route_no_writer_wait_ms) | `u64` | `250` | `✘` |
+| [`me_route_hybrid_max_wait_ms`](#me_route_hybrid_max_wait_ms) | `u64` | `3000` | `✘` |
+| [`me_route_blocking_send_timeout_ms`](#me_route_blocking_send_timeout_ms) | `u64` | `250` | `✘` |
+| [`me_route_inline_recovery_attempts`](#me_route_inline_recovery_attempts) | `u32` | `3` | `✘` |
+| [`me_route_inline_recovery_wait_ms`](#me_route_inline_recovery_wait_ms) | `u64` | `3000` | `✘` |
+| [`fast_mode_min_tls_record`](#fast_mode_min_tls_record) | `usize` | `0` | `✘` |
+| [`update_every`](#update_every) | `u64` | `300` | `✔` |
+| [`me_reinit_every_secs`](#me_reinit_every_secs) | `u64` | `900` | `✔` |
+| [`me_hardswap_warmup_delay_min_ms`](#me_hardswap_warmup_delay_min_ms) | `u64` | `1000` | `✔` |
+| [`me_hardswap_warmup_delay_max_ms`](#me_hardswap_warmup_delay_max_ms) | `u64` | `2000` | `✔` |
+| [`me_hardswap_warmup_extra_passes`](#me_hardswap_warmup_extra_passes) | `u8` | `3` | `✔` |
+| [`me_hardswap_warmup_pass_backoff_base_ms`](#me_hardswap_warmup_pass_backoff_base_ms) | `u64` | `500` | `✔` |
+| [`me_config_stable_snapshots`](#me_config_stable_snapshots) | `u8` | `2` | `✔` |
+| [`me_config_apply_cooldown_secs`](#me_config_apply_cooldown_secs) | `u64` | `300` | `✔` |
+| [`me_snapshot_require_http_2xx`](#me_snapshot_require_http_2xx) | `bool` | `true` | `✔` |
+| [`me_snapshot_reject_empty_map`](#me_snapshot_reject_empty_map) | `bool` | `true` | `✔` |
+| [`me_snapshot_min_proxy_for_lines`](#me_snapshot_min_proxy_for_lines) | `u32` | `1` | `✔` |
+| [`proxy_secret_stable_snapshots`](#proxy_secret_stable_snapshots) | `u8` | `2` | `✔` |
+| [`proxy_secret_rotate_runtime`](#proxy_secret_rotate_runtime) | `bool` | `true` | `✔` |
+| [`me_secret_atomic_snapshot`](#me_secret_atomic_snapshot) | `bool` | `true` | `✔` |
+| [`proxy_secret_len_max`](#proxy_secret_len_max) | `usize` | `256` | `✔` |
+| [`me_pool_drain_ttl_secs`](#me_pool_drain_ttl_secs) | `u64` | `90` | `✔` |
+| [`me_instadrain`](#me_instadrain) | `bool` | `false` | `✔` |
+| [`me_pool_drain_threshold`](#me_pool_drain_threshold) | `u64` | `32` | `✔` |
+| [`me_pool_drain_soft_evict_enabled`](#me_pool_drain_soft_evict_enabled) | `bool` | `true` | `✘` |
+| [`me_pool_drain_soft_evict_grace_secs`](#me_pool_drain_soft_evict_grace_secs) | `u64` | `10` | `✘` |
+| [`me_pool_drain_soft_evict_per_writer`](#me_pool_drain_soft_evict_per_writer) | `u8` | `2` | `✘` |
+| [`me_pool_drain_soft_evict_budget_per_core`](#me_pool_drain_soft_evict_budget_per_core) | `u16` | `16` | `✘` |
+| [`me_pool_drain_soft_evict_cooldown_ms`](#me_pool_drain_soft_evict_cooldown_ms) | `u64` | `1000` | `✘` |
+| [`me_bind_stale_mode`](#me_bind_stale_mode) | `"never"`, `"ttl"`, or `"always"` | `"ttl"` | `✔` |
+| [`me_bind_stale_ttl_secs`](#me_bind_stale_ttl_secs) | `u64` | `90` | `✔` |
+| [`me_pool_min_fresh_ratio`](#me_pool_min_fresh_ratio) | `f32` | `0.8` | `✔` |
+| [`me_reinit_drain_timeout_secs`](#me_reinit_drain_timeout_secs) | `u64` | `90` | `✔` |
+| [`proxy_secret_auto_reload_secs`](#proxy_secret_auto_reload_secs) | `u64` | `3600` | `✔` |
+| [`proxy_config_auto_reload_secs`](#proxy_config_auto_reload_secs) | `u64` | `3600` | `✔` |
+| [`me_reinit_singleflight`](#me_reinit_singleflight) | `bool` | `true` | `✔` |
+| [`me_reinit_trigger_channel`](#me_reinit_trigger_channel) | `usize` | `64` | `✘` |
+| [`me_reinit_coalesce_window_ms`](#me_reinit_coalesce_window_ms) | `u64` | `200` | `✔` |
+| [`me_deterministic_writer_sort`](#me_deterministic_writer_sort) | `bool` | `true` | `✔` |
+| [`me_writer_pick_mode`](#me_writer_pick_mode) | `"sorted_rr"` or `"p2c"` | `"p2c"` | `✔` |
+| [`me_writer_pick_sample_size`](#me_writer_pick_sample_size) | `u8` | `3` | `✔` |
+| [`ntp_check`](#ntp_check) | `bool` | `true` | `✘` |
+| [`ntp_servers`](#ntp_servers) | `String[]` | `["pool.ntp.org"]` | `✘` |
+| [`auto_degradation_enabled`](#auto_degradation_enabled) | `bool` | `true` | `✘` |
+| [`degradation_min_unavailable_dc_groups`](#degradation_min_unavailable_dc_groups) | `u8` | `2` | `✘` |
+| [`rst_on_close`](#rst_on_close) | `"off"`, `"errors"` или `"always"` | `"off"` | `✘` |

 ## data_path
  - **Ограничения / валидация**: `String` (необязательный параметр).
@@ -228,6 +241,24 @@
    [general]
    data_path = "/var/lib/telemt"
    ```
+## quota_state_path
+  - **Ограничения / валидация**: `Path`. Относительные пути разрешаются от рабочего каталога процесса.
+  - **Описание**: JSON-файл состояния для сохранения runtime-расхода квот по пользователям.
+  - **Пример**:
+
+    ```toml
+    [general]
+    quota_state_path = "telemt.limit.json"
+    ```
+## config_strict
+  - **Ограничения / валидация**: `bool`.
+  - **Описание**: Отклоняет неизвестные TOML-ключи во время загрузки конфигурации. При запуске процесс завершается с ошибкой; при hot-reload новый снимок отклоняется, а текущая конфигурация сохраняется.
+  - **Пример**:
+
+    ```toml
+    [general]
+    config_strict = true
+    ```
 ## prefer_ipv6
  - **Ограничения / валидация**: Устарело. Используйте `network.prefer`.
  - **Описание**: Устаревший флаг предпочтения IPv6 перенесен в `network.prefer`.
@@ -392,7 +423,7 @@
    ```
 ## me2dc_fallback
  - **Ограничения / валидация**: `bool`.
-  - **Описание**: Перейти из режима ME в режим прямого соединения (DC) в случае сбоя запуска ME.
+  - **Описание**: Разрешает fallback на прямой DC, когда ME недоступен. При `use_middle_proxy = true` запуск сначала открывает маршрутизацию через Direct-DC, а новые сеансы переводятся на ME после подтверждения готовности ME.
  - **Пример**:

    ```toml
@@ -401,14 +432,14 @@
    ```
 ## me2dc_fast
  - **Ограничения / валидация**: `bool`. Используется только, когда `use_middle_proxy = true` и `me2dc_fallback = true`.
-  - **Описание**: Режим для быстрого перехода между режимами ME->DC для новых сеансов.
+  - **Описание**: Быстрый fallback ME->Direct для новых сеансов после того, как ME уже был готов хотя бы один раз. Начальный direct-first fallback управляется `me2dc_fallback`.
  - **Пример**:

    ```toml
    [general]
    use_middle_proxy = true
    me2dc_fallback = true
-    me2dc_fast = false
+    me2dc_fast = true
    ```
 ## me_keepalive_enabled
  - **Ограничения / валидация**: `bool`.
@@ -601,7 +632,7 @@
    ```
 ## beobachten
  - **Ограничения / валидация**: `bool`.
-  - **Описание**: Включает "криминалистическое" наблюдения для каждого IP-адреса. Анализирует поведение всех подключений и записывает возможные типы клиентов, которые посылают active-probing запросы.
+  - **Описание**: Включает "криминалистическое" наблюдения для каждого IP-адреса. Анализирует поведение всех подключений, записывает возможные типы клиентов, которые посылают active-probing запросы, и добавляет snapshot’ы TLS JA3/JA4 fingerprint’ов в Beobachten output, когда есть данные.
  - **Пример**:

    ```toml
@@ -610,7 +641,7 @@
    ```
 ## beobachten_minutes
  - **Ограничения / валидация**: Должно быть `> 0` (минут).
-  - **Описание**: Время хранения (минуты) для сегментов наблюдения по каждому IP-адресу.
+  - **Описание**: Время хранения (минуты) для сегментов наблюдения по каждому IP-адресу и in-memory bucket’ов TLS fingerprint’ов.
  - **Пример**:

    ```toml
@@ -905,6 +936,15 @@
    [general]
    upstream_connect_budget_ms = 3000
    ```
+## tg_connect
+  - **Ограничения / валидация**: Должно быть `> 0` (секунды).
+  - **Описание**: Таймаут подключения к upstream-серверам Telegram.
+  - **Пример**:
+
+    ```toml
+    [general]
+    tg_connect = 10
+    ```
 ## upstream_unhealthy_fail_threshold
  - **Ограничения / валидация**: Должно быть `> 0`.
  - **Описание**: Количество неудачных запросов подряд, после которого upstream помечается, как неработоспособный.
@@ -1522,11 +1562,11 @@
 # [general.modes]


-| Ключ | Тип | По умолчанию |
-| --- | ---- | ------- |
-| [`classic`](#classic) | `bool` | `false` |
-| [`secure`](#secure) | `bool` | `false` |
-| [`tls`](#tls) | `bool` | `true` |
+| Ключ | Тип | По умолчанию | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`classic`](#classic) | `bool` | `false` | `✘` |
+| [`secure`](#secure) | `bool` | `false` | `✘` |
+| [`tls`](#tls) | `bool` | `true` | `✘` |

 ## classic
  - **Ограничения / валидация**: `bool`.
@@ -1560,11 +1600,11 @@
 # [general.links]


-| Ключ | Тип | По умолчанию |
-| --- | ---- | ------- |
-| [`show`](#show) | `"*"` or `String[]` | `"*"` |
-| [`public_host`](#public_host) | `String` | — |
-| [`public_port`](#public_port) | `u16` | — |
+| Ключ | Тип | По умолчанию | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`show`](#show) | `"*"` or `String[]` | `"*"` | `✘` |
+| [`public_host`](#public_host) | `String` | — | `✘` |
+| [`public_port`](#public_port) | `u16` | — | `✘` |

 ## show
  - **Ограничения / валидация**: `"*"` или `String[]`. Пустое значение означает, что нельзя показывать никому.
@@ -1600,11 +1640,11 @@
 # [general.telemetry]


-| Ключ | Тип | По умолчанию |
-| --- | ---- | ------- |
-| [`core_enabled`](#core_enabled) | `bool` | `true` |
-| [`user_enabled`](#user_enabled) | `bool` | `true` |
-| [`me_level`](#me_level) | `"silent"`, `"normal"`, or `"debug"` | `"normal"` |
+| Ключ | Тип | По умолчанию | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`core_enabled`](#core_enabled) | `bool` | `true` | `✔` |
+| [`user_enabled`](#user_enabled) | `bool` | `true` | `✔` |
+| [`me_level`](#me_level) | `"silent"`, `"normal"`, or `"debug"` | `"normal"` | `✔` |

 ## core_enabled
  - **Ограничения / валидация**: `bool`.
@@ -1638,18 +1678,18 @@
 # [network]


-| Ключ | Тип | По умолчанию |
-| --- | ---- | ------- |
-| [`ipv4`](#ipv4) | `bool` | `true` |
-| [`ipv6`](#ipv6) | `bool` | `false` |
-| [`prefer`](#prefer) | `u8` | `4` |
-| [`multipath`](#multipath) | `bool` | `false` |
-| [`stun_use`](#stun_use) | `bool` | `true` |
-| [`stun_servers`](#stun_servers) | `String[]` | Встроенный STUN-лист (13 записей) |
-| [`stun_tcp_fallback`](#stun_tcp_fallback) | `bool` | `true` |
-| [`http_ip_detect_urls`](#http_ip_detect_urls) | `String[]` | `["https://ifconfig.me/ip", "https://api.ipify.org"]` |
-| [`cache_public_ip_path`](#cache_public_ip_path) | `String` | `"cache/public_ip.txt"` |
-| [`dns_overrides`](#dns_overrides) | `String[]` | `[]` |
+| Ключ | Тип | По умолчанию | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`ipv4`](#ipv4) | `bool` | `true` | `✘` |
+| [`ipv6`](#ipv6) | `bool` | `false` | `✘` |
+| [`prefer`](#prefer) | `u8` | `4` | `✘` |
+| [`multipath`](#multipath) | `bool` | `false` | `✘` |
+| [`stun_use`](#stun_use) | `bool` | `true` | `✘` |
+| [`stun_servers`](#stun_servers) | `String[]` | Встроенный STUN-лист (13 записей) | `✘` |
+| [`stun_tcp_fallback`](#stun_tcp_fallback) | `bool` | `true` | `✘` |
+| [`http_ip_detect_urls`](#http_ip_detect_urls) | `String[]` | `["https://ifconfig.me/ip", "https://api.ipify.org"]` | `✘` |
+| [`cache_public_ip_path`](#cache_public_ip_path) | `String` | `"cache/public_ip.txt"` | `✘` |
+| [`dns_overrides`](#dns_overrides) | `String[]` | `[]` | `✔` |

 ## ipv4
  - **Ограничения / валидация**: `bool`.
@@ -1759,23 +1799,28 @@
 # [server]


-| Ключ | Тип | По умолчанию |
-| --- | ---- | ------- |
-| [`port`](#port) | `u16` | `443` |
-| [`listen_addr_ipv4`](#listen_addr_ipv4) | `String` | `"0.0.0.0"` |
-| [`listen_addr_ipv6`](#listen_addr_ipv6) | `String` | `"::"` |
-| [`listen_unix_sock`](#listen_unix_sock) | `String` | — |
-| [`listen_unix_sock_perm`](#listen_unix_sock_perm) | `String` | — |
-| [`listen_tcp`](#listen_tcp) | `bool` | — (auto) |
-| [`proxy_protocol`](#proxy_protocol) | `bool` | `false` |
-| [`proxy_protocol_header_timeout_ms`](#proxy_protocol_header_timeout_ms) | `u64` | `500` |
-| [`proxy_protocol_trusted_cidrs`](#proxy_protocol_trusted_cidrs) | `IpNetwork[]` | `[]` |
-| [`metrics_port`](#metrics_port) | `u16` | — |
-| [`metrics_listen`](#metrics_listen) | `String` | — |
-| [`metrics_whitelist`](#metrics_whitelist) | `IpNetwork[]` | `["127.0.0.1/32", "::1/128"]` |
-| [`max_connections`](#max_connections) | `u32` | `10000` |
-| [`accept_permit_timeout_ms`](#accept_permit_timeout_ms) | `u64` | `250` |
-| [`listen_backlog`](#listen_backlog) | `u32` | `1024` |
+| Ключ | Тип | По умолчанию | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`port`](#port) | `u16` | `443` | `✘` |
+| [`listen_addr_ipv4`](#listen_addr_ipv4) | `String` | `"0.0.0.0"` | `✘` |
+| [`listen_addr_ipv6`](#listen_addr_ipv6) | `String` | `"::"` | `✘` |
+| [`listen_unix_sock`](#listen_unix_sock) | `String` | — | `✘` |
+| [`listen_unix_sock_perm`](#listen_unix_sock_perm) | `String` | — | `✘` |
+| [`listen_tcp`](#listen_tcp) | `bool` | — (auto) | `✘` |
+| [`client_mss`](#client_mss) | `String` | `""` | `✘` |
+| [`proxy_protocol`](#proxy_protocol) | `bool` | `false` | `✘` |
+| [`proxy_protocol_header_timeout_ms`](#proxy_protocol_header_timeout_ms) | `u64` | `500` | `✘` |
+| [`proxy_protocol_trusted_cidrs`](#proxy_protocol_trusted_cidrs) | `IpNetwork[]` | `[]` | `✘` |
+| [`metrics_port`](#metrics_port) | `u16` | — | `✘` |
+| [`metrics_listen`](#metrics_listen) | `String` | — | `✘` |
+| [`metrics_whitelist`](#metrics_whitelist) | `IpNetwork[]` | `["127.0.0.1/32", "::1/128"]` | `✘` |
+| [`api`](#serverapi) | `Table` | встроенные значения | `✘` |
+| [`admin_api`](#serverapi) | `Table` | алиас для `api` | `✘` |
+| [`listeners`](#serverlisteners) | `Table[]` | выводится из legacy listener-полей | `✘` |
+| [`max_connections`](#max_connections) | `u32` | `10000` | `✘` |
+| [`accept_permit_timeout_ms`](#accept_permit_timeout_ms) | `u64` | `250` | `✘` |
+| [`listen_backlog`](#listen_backlog) | `u32` | `1024` | `✘` |
+| [`conntrack_control`](#serverconntrack_control) | `Table` | встроенные значения | `✘` |

 ## port
  - **Ограничения / валидация**: `u16`.
@@ -1845,6 +1890,16 @@
    listen_unix_sock = "/run/telemt.sock"
    listen_tcp = true
    ```
+## client_mss
+  - **Ограничения / валидация**: `String`. Пустое значение или отсутствие параметра означает, что Telemt не изменяет MSS, выбранный ядром. Поддерживаемые presets: `"extreme-low"` = `88`, `"tspu"` = `92`, `"2in8"` = `256`. Пользовательское десятичное значение должно быть строкой в диапазоне `88..=4096`.
+  - **Описание**: MSS для входящих TCP-соединений клиентов. Значение применяется к TCP listener-сокетам до `listen(2)`, чтобы Linux мог объявить его в SYN/ACK. Параметр влияет только на proxy client TCP listeners и не применяется к API, metrics, Unix sockets, Telegram upstreams, ME sockets или mask backend connections. Изменение требует restart/rebind listener’ов.
+  - **Performance note**: Низкий MSS предсказуемо увеличивает количество TCP-сегментов. Приблизительный multiplier: `ceil(1460 / client_mss)`.
+  - **Пример**:
+
+    ```toml
+    [server]
+    client_mss = "tspu"
+    ```
 ## proxy_protocol
  - **Ограничения / валидация**: `bool`.
  - **Описание**: Включает поддержку разбора PROXY protocol от HAProxy (v1/v2) на входящих соединениях. При включении исходный IP клиента берётся из PROXY-заголовка.
@@ -1931,16 +1986,16 @@
 Примечание. Рабочий процесс `conntrack-control` работает **только в Linux**. В других операционных системах не запускается; если inline_conntrack_control имеет значение `true`, в логи записывается предупреждение. Для эффективной работы также требуется **CAP_NET_ADMIN** и пригодный к использованию бэкенд (nft или iptables/ip6tables в PATH). Утилита `conntrack` используется для удаления необязательных записей таблицы под нагрузкой.


-| Ключ | Тип | По умолчанию |
-| --- | ---- | ------- |
-| [`inline_conntrack_control`](#inline_conntrack_control) | `bool` | `true` |
-| [`mode`](#mode) | `String` | `"tracked"` |
-| [`backend`](#backend) | `String` | `"auto"` |
-| [`profile`](#profile) | `String` | `"balanced"` |
-| [`hybrid_listener_ips`](#hybrid_listener_ips) | `IpAddr[]` | `[]` |
-| [`pressure_high_watermark_pct`](#pressure_high_watermark_pct) | `u8` | `85` |
-| [`pressure_low_watermark_pct`](#pressure_low_watermark_pct) | `u8` | `70` |
-| [`delete_budget_per_sec`](#delete_budget_per_sec) | `u64` | `4096` |
+| Ключ | Тип | По умолчанию | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`inline_conntrack_control`](#inline_conntrack_control) | `bool` | `true` | `✘` |
+| [`mode`](#mode) | `String` | `"tracked"` | `✘` |
+| [`backend`](#backend) | `String` | `"auto"` | `✘` |
+| [`profile`](#profile) | `String` | `"balanced"` | `✘` |
+| [`hybrid_listener_ips`](#hybrid_listener_ips) | `IpAddr[]` | `[]` | `✘` |
+| [`pressure_high_watermark_pct`](#pressure_high_watermark_pct) | `u8` | `85` | `✘` |
+| [`pressure_low_watermark_pct`](#pressure_low_watermark_pct) | `u8` | `70` | `✘` |
+| [`delete_budget_per_sec`](#delete_budget_per_sec) | `u64` | `4096` | `✘` |

 ## inline_conntrack_control
  - **Ограничения / валидация**: `bool`.
@@ -2027,21 +2082,21 @@
 Примечание: В этом разделе также задается устаревший параметр `[server.admin_api]` (аналогично `[server.api]`).


-| Ключ | Тип | По умолчанию |
-| --- | ---- | ------- |
-| [`enabled`](#enabled) | `bool` | `true` |
-| [`listen`](#listen) | `String` | `"0.0.0.0:9091"` |
-| [`whitelist`](#whitelist) | `IpNetwork[]` | `["127.0.0.0/8"]` |
-| [`auth_header`](#auth_header) | `String` | `""` |
-| [`request_body_limit_bytes`](#request_body_limit_bytes) | `usize` | `65536` |
-| [`minimal_runtime_enabled`](#minimal_runtime_enabled) | `bool` | `true` |
-| [`minimal_runtime_cache_ttl_ms`](#minimal_runtime_cache_ttl_ms) | `u64` | `1000` |
-| [`runtime_edge_enabled`](#runtime_edge_enabled) | `bool` | `false` |
-| [`runtime_edge_cache_ttl_ms`](#runtime_edge_cache_ttl_ms) | `u64` | `1000` |
-| [`runtime_edge_top_n`](#runtime_edge_top_n) | `usize` | `10` |
-| [`runtime_edge_events_capacity`](#runtime_edge_events_capacity) | `usize` | `256` |
-| [`read_only`](#read_only) | `bool` | `false` |
-| [`gray_action`](#gray_action) | `"drop"`, `"api"`, or `"200"` | `"drop"` |
+| Ключ | Тип | По умолчанию | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`enabled`](#enabled) | `bool` | `true` | `✘` |
+| [`listen`](#listen) | `String` | `"0.0.0.0:9091"` | `✘` |
+| [`whitelist`](#whitelist) | `IpNetwork[]` | `["127.0.0.0/8"]` | `✘` |
+| [`auth_header`](#auth_header) | `String` | `""` | `✘` |
+| [`request_body_limit_bytes`](#request_body_limit_bytes) | `usize` | `65536` | `✘` |
+| [`minimal_runtime_enabled`](#minimal_runtime_enabled) | `bool` | `true` | `✘` |
+| [`minimal_runtime_cache_ttl_ms`](#minimal_runtime_cache_ttl_ms) | `u64` | `1000` | `✘` |
+| [`runtime_edge_enabled`](#runtime_edge_enabled) | `bool` | `false` | `✘` |
+| [`runtime_edge_cache_ttl_ms`](#runtime_edge_cache_ttl_ms) | `u64` | `1000` | `✘` |
+| [`runtime_edge_top_n`](#runtime_edge_top_n) | `usize` | `10` | `✘` |
+| [`runtime_edge_events_capacity`](#runtime_edge_events_capacity) | `usize` | `256` | `✘` |
+| [`read_only`](#read_only) | `bool` | `false` | `✘` |
+| [`gray_action`](#gray_action) | `"drop"`, `"api"`, or `"200"` | `"drop"` | `✘` |

 ## enabled
  - **Ограничения / валидация**: `bool`.
@@ -2135,7 +2190,7 @@
    ```
 ## runtime_edge_top_n
  - **Ограничения / валидация**: `1..=1000`.
-  - **Описание**: Размер выборки Top-N для рейтинга (leaderboard) edge-соединений.
+  - **Описание**: Размер выборки Top-N для snapshot’ов рейтинга edge-соединений и TLS fingerprint’ов.
  - **Пример**:

    ```toml
@@ -2165,13 +2220,15 @@
 # [[server.listeners]]


-| Ключ | Тип | По умолчанию |
-| --- | ---- | ------- |
-| [`ip`](#ip) | `IpAddr` | — |
-| [`announce`](#announce) | `String` | — |
-| [`announce_ip`](#announce_ip) | `IpAddr` | — |
-| [`proxy_protocol`](#proxy_protocol) | `bool` | — |
-| [`reuse_allow`](#reuse_allow) | `bool` | `false` |
+| Ключ | Тип | По умолчанию | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`ip`](#ip) | `IpAddr` | — | `✘` |
+| [`port`](#port-serverlisteners) | `u16` | `server.port` | `✘` |
+| [`client_mss`](#client_mss-serverlisteners) | `String` | `[server].client_mss` | `✘` |
+| [`announce`](#announce) | `String` | — | `✘` |
+| [`announce_ip`](#announce_ip) | `IpAddr` | — | `✘` |
+| [`proxy_protocol`](#proxy_protocol) | `bool` | — | `✘` |
+| [`reuse_allow`](#reuse_allow) | `bool` | `false` | `✘` |

 ## ip
  - **Ограничения / валидация**: Обязательный параметр. Значение должно содержать IP-адрес в формате строки.
@@ -2182,6 +2239,27 @@
    [[server.listeners]]
    ip = "0.0.0.0"
    ```
+## port (server.listeners)
+  - **Ограничения / валидация**: `u16` (необязательный параметр). Если не задан, используется `server.port`.
+  - **Описание**: TCP-порт для конкретного listener’а.
+  - **Пример**:
+
+    ```toml
+    [[server.listeners]]
+    ip = "0.0.0.0"
+    port = 443
+    ```
+## client_mss (server.listeners)
+  - **Ограничения / валидация**: `String` (необязательный параметр). Допустимые значения совпадают с `[server].client_mss`.
+  - **Описание**: Per-listener override для MSS. Если параметр не задан, listener наследует `[server].client_mss`; если задана пустая строка, MSS shaping отключается только для этого listener’а, даже когда глобальный параметр задан. Изменение требует restart/rebind listener’а.
+  - **Пример**:
+
+    ```toml
+    [[server.listeners]]
+    ip = "0.0.0.0"
+    port = 443
+    client_mss = "256"
+    ```
 ## announce
  - **Ограничения / валидация**: `String` (необязательный параметр). Не должен быть пустым, если задан.
  - **Описание**: Публичный IP-адрес или домен, объявляемый в proxy-ссылках для данного listener’а. Имеет приоритет над `announce_ip`.
@@ -2215,8 +2293,7 @@
    ip = "0.0.0.0"
    proxy_protocol = true
    ```
-## reuse_allow"
- `reuse_allow`
+## reuse_allow
  - **Ограничения / валидация**: `bool`.
  - **Описание**: Включает `SO_REUSEPORT` для совместного использования привязки нескольких экземпляров (позволяет нескольким экземплярам telemt прослушивать один и тот же `ip:port`).
  - **Пример**:
@@ -2231,18 +2308,18 @@
 # [timeouts]


-| Ключ | Тип | По умолчанию |
-| --- | ---- | ------- |
-| [`client_handshake`](#client_handshake) | `u64` | `30` |
-| [`relay_idle_policy_v2_enabled`](#relay_idle_policy_v2_enabled) | `bool` | `true` |
-| [`relay_client_idle_soft_secs`](#relay_client_idle_soft_secs) | `u64` | `120` |
-| [`relay_client_idle_hard_secs`](#relay_client_idle_hard_secs) | `u64` | `360` |
-| [`relay_idle_grace_after_downstream_activity_secs`](#relay_idle_grace_after_downstream_activity_secs) | `u64` | `30` |
-| [`tg_connect`](#tg_connect) | `u64` | `10` |
-| [`client_keepalive`](#client_keepalive) | `u64` | `15` |
-| [`client_ack`](#client_ack) | `u64` | `90` |
-| [`me_one_retry`](#me_one_retry) | `u8` | `12` |
-| [`me_one_timeout_ms`](#me_one_timeout_ms) | `u64` | `1200` |
+| Ключ | Тип | По умолчанию | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`client_first_byte_idle_secs`](#client_first_byte_idle_secs) | `u64` | `300` | `✘` |
+| [`client_handshake`](#client_handshake) | `u64` | `30` | `✘` |
+| [`relay_idle_policy_v2_enabled`](#relay_idle_policy_v2_enabled) | `bool` | `true` | `✘` |
+| [`relay_client_idle_soft_secs`](#relay_client_idle_soft_secs) | `u64` | `120` | `✘` |
+| [`relay_client_idle_hard_secs`](#relay_client_idle_hard_secs) | `u64` | `360` | `✘` |
+| [`relay_idle_grace_after_downstream_activity_secs`](#relay_idle_grace_after_downstream_activity_secs) | `u64` | `30` | `✘` |
+| [`client_keepalive`](#client_keepalive) | `u64` | `15` | `✘` |
+| [`client_ack`](#client_ack) | `u64` | `90` | `✘` |
+| [`me_one_retry`](#me_one_retry) | `u8` | `12` | `✘` |
+| [`me_one_timeout_ms`](#me_one_timeout_ms) | `u64` | `1200` | `✘` |

 ## client_handshake
  - **Ограничения / валидация**: Должно быть `> 0`. Значение указано в секундах. Также используется в качестве верхней границы некоторых задержек эмуляции TLS (см. `censorship.server_hello_delay_max_ms`).
@@ -2298,15 +2375,6 @@
    [timeouts]
    relay_idle_grace_after_downstream_activity_secs = 30
    ```
-## tg_connect
-  - **Ограничения / валидация**: `u64` (секунд).
-  - **Описание**: Таймаут подключения к upstream-серверу Telegram (в секундах).
-  - **Пример**:
-
-    ```toml
-    [timeouts]
-    tg_connect = 10
-    ```
 ## client_keepalive
  - **Ограничения / валидация**: `u64` (секунд).
  - **Описание**: Таймаут keepalive для клиента..
@@ -2348,40 +2416,40 @@
 # [censorship]


-| Ключ | Тип | По умолчанию |
-| --- | ---- | ------- |
-| [`tls_domain`](#tls_domain) | `String` | `"petrovich.ru"` |
-| [`tls_domains`](#tls_domains) | `String[]` | `[]` |
-| [`unknown_sni_action`](#unknown_sni_action) | `"drop"`, `"mask"`, `"accept"`, `"reject_handshake"` | `"drop"` |
-| [`tls_fetch_scope`](#tls_fetch_scope) | `String` | `""` |
-| [`tls_fetch`](#tls_fetch) | `Table` | built-in defaults |
-| [`mask`](#mask) | `bool` | `true` |
-| [`mask_host`](#mask_host) | `String` | — |
-| [`mask_port`](#mask_port) | `u16` | `443` |
-| [`mask_unix_sock`](#mask_unix_sock) | `String` | — |
-| [`fake_cert_len`](#fake_cert_len) | `usize` | `2048` |
-| [`tls_emulation`](#tls_emulation) | `bool` | `true` |
-| [`tls_front_dir`](#tls_front_dir) | `String` | `"tlsfront"` |
-| [`server_hello_delay_min_ms`](#server_hello_delay_min_ms) | `u64` | `0` |
-| [`server_hello_delay_max_ms`](#server_hello_delay_max_ms) | `u64` | `0` |
-| [`tls_new_session_tickets`](#tls_new_session_tickets) | `u8` | `0` |
-| [`tls_full_cert_ttl_secs`](#tls_full_cert_ttl_secs) | `u64` | `90` |
-| [`serverhello_compact`](#serverhello_compact) | `bool` | `false` |
-| [`alpn_enforce`](#alpn_enforce) | `bool` | `true` |
-| [`mask_proxy_protocol`](#mask_proxy_protocol) | `u8` | `0` |
-| [`mask_shape_hardening`](#mask_shape_hardening) | `bool` | `true` |
-| [`mask_shape_hardening_aggressive_mode`](#mask_shape_hardening_aggressive_mode) | `bool` | `false` |
-| [`mask_shape_bucket_floor_bytes`](#mask_shape_bucket_floor_bytes) | `usize` | `512` |
-| [`mask_shape_bucket_cap_bytes`](#mask_shape_bucket_cap_bytes) | `usize` | `4096` |
-| [`mask_shape_above_cap_blur`](#mask_shape_above_cap_blur) | `bool` | `false` |
-| [`mask_shape_above_cap_blur_max_bytes`](#mask_shape_above_cap_blur_max_bytes) | `usize` | `512` |
-| [`mask_relay_max_bytes`](#mask_relay_max_bytes) | `usize` | `5242880` |
-| [`mask_relay_timeout_ms`](mask_relay_timeout_ms) | `u64` | `60_000` |
-| [`mask_relay_idle_timeout_ms`](mask_relay_idle_timeout_ms) | `u64` | `5_000` |
-| [`mask_classifier_prefetch_timeout_ms`](#mask_classifier_prefetch_timeout_ms) | `u64` | `5` |
-| [`mask_timing_normalization_enabled`](#mask_timing_normalization_enabled) | `bool` | `false` |
-| [`mask_timing_normalization_floor_ms`](#mask_timing_normalization_floor_ms) | `u64` | `0` |
-| [`mask_timing_normalization_ceiling_ms`](#mask_timing_normalization_ceiling_ms) | `u64` | `0` |
+| Ключ | Тип | По умолчанию | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`tls_domain`](#tls_domain) | `String` | `"petrovich.ru"` | `✘` |
+| [`tls_domains`](#tls_domains) | `String[]` | `[]` | `✘` |
+| [`unknown_sni_action`](#unknown_sni_action) | `"drop"`, `"mask"`, `"accept"`, `"reject_handshake"` | `"drop"` | `✘` |
+| [`tls_fetch_scope`](#tls_fetch_scope) | `String` | `""` | `✘` |
+| [`tls_fetch`](#tls_fetch) | `Table` | built-in defaults | `✘` |
+| [`mask`](#mask) | `bool` | `true` | `✘` |
+| [`mask_host`](#mask_host) | `String` | — | `✘` |
+| [`mask_port`](#mask_port) | `u16` | `443` | `✘` |
+| [`mask_unix_sock`](#mask_unix_sock) | `String` | — | `✘` |
+| [`fake_cert_len`](#fake_cert_len) | `usize` | `2048` | `✘` |
+| [`tls_emulation`](#tls_emulation) | `bool` | `true` | `✘` |
+| [`tls_front_dir`](#tls_front_dir) | `String` | `"tlsfront"` | `✘` |
+| [`server_hello_delay_min_ms`](#server_hello_delay_min_ms) | `u64` | `0` | `✘` |
+| [`server_hello_delay_max_ms`](#server_hello_delay_max_ms) | `u64` | `0` | `✘` |
+| [`tls_new_session_tickets`](#tls_new_session_tickets) | `u8` | `0` | `✘` |
+| [`tls_full_cert_ttl_secs`](#tls_full_cert_ttl_secs) | `u64` | `90` | `✘` |
+| [`serverhello_compact`](#serverhello_compact) | `bool` | `false` | `✘` |
+| [`alpn_enforce`](#alpn_enforce) | `bool` | `true` | `✘` |
+| [`mask_proxy_protocol`](#mask_proxy_protocol) | `u8` | `0` | `✘` |
+| [`mask_shape_hardening`](#mask_shape_hardening) | `bool` | `true` | `✘` |
+| [`mask_shape_hardening_aggressive_mode`](#mask_shape_hardening_aggressive_mode) | `bool` | `false` | `✘` |
+| [`mask_shape_bucket_floor_bytes`](#mask_shape_bucket_floor_bytes) | `usize` | `512` | `✘` |
+| [`mask_shape_bucket_cap_bytes`](#mask_shape_bucket_cap_bytes) | `usize` | `4096` | `✘` |
+| [`mask_shape_above_cap_blur`](#mask_shape_above_cap_blur) | `bool` | `false` | `✘` |
+| [`mask_shape_above_cap_blur_max_bytes`](#mask_shape_above_cap_blur_max_bytes) | `usize` | `512` | `✘` |
+| [`mask_relay_max_bytes`](#mask_relay_max_bytes) | `usize` | `5242880` | `✘` |
+| [`mask_relay_timeout_ms`](mask_relay_timeout_ms) | `u64` | `60_000` | `✘` |
+| [`mask_relay_idle_timeout_ms`](mask_relay_idle_timeout_ms) | `u64` | `5_000` | `✘` |
+| [`mask_classifier_prefetch_timeout_ms`](#mask_classifier_prefetch_timeout_ms) | `u64` | `5` | `✘` |
+| [`mask_timing_normalization_enabled`](#mask_timing_normalization_enabled) | `bool` | `false` | `✘` |
+| [`mask_timing_normalization_floor_ms`](#mask_timing_normalization_floor_ms) | `u64` | `0` | `✘` |
+| [`mask_timing_normalization_ceiling_ms`](#mask_timing_normalization_ceiling_ms) | `u64` | `0` | `✘` |

 ## tls_domain
  - **Ограничения / валидация**: Не должно быть пустым. Не должно содержать пробелы или `/`.
@@ -2464,6 +2532,18 @@
    [censorship]
    mask_port = 443
    ```
+## exclusive_mask
+  - **Ограничения / валидация**: TOML map. Ключи должны быть доменами SNI. Значения должны иметь формат `host:port`, где `port > 0`; IPv6 literals должны быть в квадратных скобках.
+  - **Описание**: Per-SNI TCP targets для fallback-трафика. Если SNI в TLS ClientHello совпадает с ключом, Telemt проксирует это неаутентифицированное соединение на указанный target. Остальной fallback-трафик продолжает использовать существующий `mask_host`/`mask_port` или SNI-aware default masking behavior.
+  - **Пример**:
+
+    ```toml
+    [censorship]
+    tls_domains = ["petrovich.ru", "bsi.bund.de", "telekom.com"]
+
+    [censorship.exclusive_mask]
+    "bsi.bund.de" = "127.0.0.1:443"
+    ```
 ## mask_unix_sock
  - **Ограничения / валидация**: `String` (optional).
    - Значение не должно быть пустым, если задан.
@@ -2804,15 +2884,15 @@
 # [censorship.tls_fetch]


-| Ключ | Тип | По умолчанию |
-| --- | ---- | ------- |
-| [`profiles`](#profiles) | `String[]` | `["modern_chrome_like", "modern_firefox_like", "compat_tls12", "legacy_minimal"]` |
-| [`strict_route`](#strict_route) | `bool` | `true` |
-| [`attempt_timeout_ms`](#attempt_timeout_ms) | `u64` | `5000` |
-| [`total_budget_ms`](#total_budget_ms) | `u64` | `15000` |
-| [`grease_enabled`](#grease_enabled) | `bool` | `false` |
-| [`deterministic`](#deterministic) | `bool` | `false` |
-| [`profile_cache_ttl_secs`](#profile_cache_ttl_secs) | `u64` | `600` |
+| Ключ | Тип | По умолчанию | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`profiles`](#profiles) | `String[]` | `["modern_chrome_like", "modern_firefox_like", "compat_tls12", "legacy_minimal"]` | `✘` |
+| [`strict_route`](#strict_route) | `bool` | `true` | `✘` |
+| [`attempt_timeout_ms`](#attempt_timeout_ms) | `u64` | `5000` | `✘` |
+| [`total_budget_ms`](#total_budget_ms) | `u64` | `15000` | `✘` |
+| [`grease_enabled`](#grease_enabled) | `bool` | `false` | `✘` |
+| [`deterministic`](#deterministic) | `bool` | `false` | `✘` |
+| [`profile_cache_ttl_secs`](#profile_cache_ttl_secs) | `u64` | `600` | `✘` |

 ## profiles
  - **Ограничения / валидация**: `String[]`. Пустой список возвращает значения по умолчанию; дубликаты удаляются с сохранением порядка.
@@ -2881,23 +2961,24 @@
 # [access]


-| Ключ | Тип | По умолчанию |
-| --- | ---- | ------- |
-| [`users`](#users) | `Map<String, String>` | `{"default": "000…000"}` |
-| [`user_ad_tags`](#user_ad_tags) | `Map<String, String>` | `{}` |
-| [`user_max_tcp_conns`](#user_max_tcp_conns) | `Map<String, usize>` | `{}` |
-| [`user_max_tcp_conns_global_each`](#user_max_tcp_conns_global_each) | `usize` | `0` |
-| [`user_expirations`](#user_expirations) | `Map<String, DateTime<Utc>>` | `{}` |
-| [`user_data_quota`](#user_data_quota) | `Map<String, u64>` | `{}` |
-| [`user_max_unique_ips`](#user_max_unique_ips) | `Map<String, usize>` | `{}` |
-| [`user_max_unique_ips_global_each`](#user_max_unique_ips_global_each) | `usize` | `0` |
-| [`user_max_unique_ips_mode`](#user_max_unique_ips_mode) | `"active_window"`, `"time_window"`, or `"combined"` | `"active_window"` |
-| [`user_max_unique_ips_window_secs`](#user_max_unique_ips_window_secs) | `u64` | `30` |
-| [`replay_check_len`](#replay_check_len) | `usize` | `65536` |
-| [`replay_window_secs`](#replay_window_secs) | `u64` | `120` |
-| [`ignore_time_skew`](#ignore_time_skew) | `bool` | `false` |
-| [`user_rate_limits`](#user_rate_limits) | `Map<String, RateLimitBps>` | `{}` |
-| [`cidr_rate_limits`](#cidr_rate_limits) | `Map<IpNetwork, RateLimitBps>` | `{}` |
+| Ключ | Тип | По умолчанию | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`users`](#users) | `Map<String, String>` | `{"default": "000…000"}` | `✔` |
+| [`user_ad_tags`](#user_ad_tags) | `Map<String, String>` | `{}` | `✔` |
+| [`user_max_tcp_conns`](#user_max_tcp_conns) | `Map<String, usize>` | `{}` | `✔` |
+| [`user_max_tcp_conns_global_each`](#user_max_tcp_conns_global_each) | `usize` | `0` | `✔` |
+| [`user_expirations`](#user_expirations) | `Map<String, DateTime<Utc>>` | `{}` | `✔` |
+| [`user_data_quota`](#user_data_quota) | `Map<String, u64>` | `{}` | `✔` |
+| [`user_max_unique_ips`](#user_max_unique_ips) | `Map<String, usize>` | `{}` | `✔` |
+| [`user_max_unique_ips_global_each`](#user_max_unique_ips_global_each) | `usize` | `0` | `✔` |
+| [`user_max_unique_ips_mode`](#user_max_unique_ips_mode) | `"active_window"`, `"time_window"`, or `"combined"` | `"active_window"` | `✔` |
+| [`user_max_unique_ips_window_secs`](#user_max_unique_ips_window_secs) | `u64` | `30` | `✔` |
+| [`user_source_deny`](#user_source_deny) | `Map<String, IpNetwork[]>` | `{}` | `✘` |
+| [`replay_check_len`](#replay_check_len) | `usize` | `65536` | `✘` |
+| [`replay_window_secs`](#replay_window_secs) | `u64` | `120` | `✘` |
+| [`ignore_time_skew`](#ignore_time_skew) | `bool` | `false` | `✘` |
+| [`user_rate_limits`](#user_rate_limits) | `Map<String, RateLimitBps>` | `{}` | `✔` |
+| [`cidr_rate_limits`](#cidr_rate_limits) | `Map<IpNetwork, RateLimitBps>` | `{}` | `✔` |

 ## users
  - **Ограничения / валидация**: Не должно быть пустым (должен существовать хотя бы один пользователь). Каждое значение должно состоять **ровно из 32 шестнадцатеричных символов**.
@@ -2997,6 +3078,20 @@
    [access]
    user_max_unique_ips_window_secs = 30
    ```
+## user_source_deny
+  - **Ограничения / валидация**: Таблица `username -> IpNetwork[]`. Каждая сеть должна разбираться как CIDR, например `203.0.113.0/24` или `2001:db8::/32`.
+  - **Описание**: Deny-list исходных IP/CIDR для конкретного пользователя, применяемый **после успешной аутентификации** в TLS- и MTProto-handshake путях. Совпавший source IP отклоняется тем же fail-closed путём, что и невалидная аутентификация.
+  - **Пример**:
+
+    ```toml
+    [access.user_source_deny]
+    alice = ["203.0.113.0/24", "2001:db8:abcd::/48"]
+    bob = ["198.51.100.42/32"]
+    ```
+
+  - **Краткая проверка**:
+    - соединение пользователя `alice` с source `203.0.113.55` отклоняется, потому что совпадает с `203.0.113.0/24`;
+    - соединение пользователя `alice` с source `198.51.100.10` допускается этим набором правил, потому что совпадений нет.
 ## replay_check_len
  - **Ограничения / валидация**: `usize`.
  - **Описание**: Количество последних сообщений/запросов, которое система запоминает, чтобы не допустить их повторной отправки (replay).
@@ -3047,19 +3142,24 @@
 # [[upstreams]]


-| Ключ | Тип | По умолчанию |
-| --- | ---- | ------- |
-| [`type`](#type) | `"direct"`, `"socks4"`, `"socks5"`, or `"shadowsocks"` | — |
-| [`weight`](#weight) | `u16` | `1` |
-| [`enabled`](#enabled) | `bool` | `true` |
-| [`scopes`](#scopes) | `String` | `""` |
-| [`interface`](#interface) | `String` | — |
-| [`bind_addresses`](#bind_addresses) | `String[]` | — |
-| [`url`](#url) | `String` | — |
-| [`address`](#address) | `String` | — |
-| [`user_id`](#user_id) | `String` | — |
-| [`username`](#username) | `String` | — |
-| [`password`](#password) | `String` | — |
+| Ключ | Тип | По умолчанию | Hot-Reload |
+| --- | ---- | ------- | ---------- |
+| [`type`](#type) | `"direct"`, `"socks4"`, `"socks5"`, or `"shadowsocks"` | — | `✘` |
+| [`weight`](#weight) | `u16` | `1` | `✘` |
+| [`enabled`](#enabled) | `bool` | `true` | `✘` |
+| [`scopes`](#scopes) | `String` | `""` | `✘` |
+| [`ipv4`](#ipv4-upstreams) | `bool` | — (auto) | `✘` |
+| [`ipv6`](#ipv6-upstreams) | `bool` | — (auto) | `✘` |
+| [`prefer`](#prefer-upstreams) | `4` или `6` | эффективный `[network].prefer` | `✘` |
+| [`interface`](#interface) | `String` | — | `✘` |
+| [`bind_addresses`](#bind_addresses) | `String[]` | — | `✘` |
+| [`bindtodevice`](#bindtodevice) | `String` | — | `✘` |
+| [`force_bind`](#force_bind) | `String` | — | `✘` |
+| [`url`](#url) | `String` | — | `✘` |
+| [`address`](#address) | `String` | — | `✘` |
+| [`user_id`](#user_id) | `String` | — | `✘` |
+| [`username`](#username) | `String` | — | `✘` |
+| [`password`](#password) | `String` | — | `✘` |

 ## type
  - **Ограничения / валидация**: Обязательный параметр.`"direct"`, `"socks4"`, `"socks5"`, `"shadowsocks"`.
@@ -3110,6 +3210,38 @@
    address = "10.0.0.10:1080"
    scopes = "me, fetch, dc2"
    ```
+## ipv4 (upstreams)
+  - **Ограничения / валидация**: `bool` (необязательный параметр).
+  - **Описание**: Разрешает IPv4 DC-targets для этого upstream. Если не задан, Telemt определяет поддержку автоматически по runtime-состоянию connectivity.
+  - **Пример**:
+
+    ```toml
+    [[upstreams]]
+    type = "direct"
+    ipv4 = true
+    ```
+## ipv6 (upstreams)
+  - **Ограничения / валидация**: `bool` (необязательный параметр).
+  - **Описание**: Разрешает IPv6 DC-targets для этого upstream. Если не задан, Telemt определяет поддержку автоматически по runtime-состоянию connectivity. Установите `true`, если upstream proxy доступен с локального хоста по IPv4, но сам proxy умеет подключаться к Telegram DC по IPv6.
+  - **Пример**:
+
+    ```toml
+    [[upstreams]]
+    type = "direct"
+    ipv6 = false
+    ```
+## prefer (upstreams)
+  - **Ограничения / валидация**: Необязательное число. Должно быть `4` или `6`.
+  - **Описание**: Переопределяет предпочтительное IP-семейство для Telegram DC-targets, выбранных через этот upstream. Если параметр не задан, upstream наследует эффективное глобальное решение `[network].prefer`. Используйте `prefer = 6` вместе с `ipv6 = true` для SOCKS или Shadowsocks upstream, который умеет выходить в IPv6, даже если локальный хост с Telemt работает только по IPv4.
+  - **Пример**:
+
+    ```toml
+    [[upstreams]]
+    type = "socks5"
+    address = "192.0.2.10:1080"
+    ipv6 = true
+    prefer = 6
+    ```
 ## interface
  - **Ограничения / валидация**: `String` (необязательный параметр).
    - для `"direct"`: может быть IP-адресом (используется как явный local bind) или именем сетевого интерфейса ОС (резолвится в IP во время выполнения; только Unix).
@@ -3140,6 +3272,26 @@
    type = "direct"
    bind_addresses = ["192.0.2.10", "192.0.2.11"]
    ```
+## bindtodevice
+  - **Ограничения / валидация**: `String` (необязательный параметр). Применяется только для `type = "direct"` и только в Linux.
+  - **Описание**: Жёсткая привязка исходящих direct TCP-connect к интерфейсу через `SO_BINDTODEVICE`.
+  - **Пример**:
+
+    ```toml
+    [[upstreams]]
+    type = "direct"
+    bindtodevice = "eth0"
+    ```
+## force_bind
+  - **Ограничения / валидация**: `String` (необязательный параметр). Алиас для `bindtodevice`.
+  - **Описание**: Обратно-совместимый алиас для жёсткой Linux-привязки к интерфейсу через `SO_BINDTODEVICE`.
+  - **Пример**:
+
+    ```toml
+    [[upstreams]]
+    type = "direct"
+    force_bind = "eth0"
+    ```
 ## url
  - **Ограничения / валидация**: Применяется в случае, если `type = "shadowsocks"`.
    - Должен быть действительный URL-адрес Shadowsocks, принятый `shadowsocks` контейнером.
@@ -172,7 +172,7 @@ Those cross-DC requests are normal and happen constantly.
 > If your home DC is DC2 and DC2 goes down, you **cannot** reach DC5 even though DC5 itself is perfectly healthy.  
 > The client has no valid session to route the request through.  

-This is also why an MTProxy only needs to reach Telegram's DC infrastructure as a whole.  
+This is also why it is required for MTProxy to reach Telegram's DC infrastructure as a whole.  
 The proxy itself doesn't care which DC your account lives on. The client negotiates the correct DC through the proxy after connecting.

 ### How many people can use one link
@@ -40,6 +40,8 @@ hello2 = "ad_tag2"
 > Проблема с TLS отпечатком исправлена в последних версиях клиентов Telegram для Desktop / Android / iOS.  
 > Обновите свой клиент для корректной работы с MTProxy Fake-TLS!

+- Для расследования блокировок на базе JA4 ClientHello используйте отдельную инструкцию: [`JA3 и JA4 анализ в Telemt`](Architecture/Fronting-splitting/TLS_JA3_JA4_ANALYSIS.ru.md).
+
 - Мы считаем это прорывом, которому на сегодняшний день нет стабильных аналогов;
 - Исходя из этого: если `telemt` настроен правильно, **режим TLS полностью идентичен реальному «рукопожатию» + обмену данными** с указанным хостом;
 - Вот наши доказательства:
@@ -157,7 +159,7 @@ https://github.com/telemt/telemt/discussions/167

 ## Как клиенты взаимодействуют с дата-центрами Telegram
 При регистрации аккаунта Telegram он навсегда привязывается к одному из дата-центров (DC).  
-Telegram заранее определяет к какому DC привязать аккаунт исходя из региона, к которому относиться номер телефона.  
+Telegram заранее определяет к какому DC привязать аккаунт исходя из региона, к которому относится номер телефона.  
 Этот DC становится вашим **домашним**: именно там хранится весь контент, который вы загружаете (фото, видео, файлы, сообщения).  
 И именно на нем клиент авторизуется при каждом подключении.  

@@ -170,7 +172,7 @@ Telegram заранее определяет к какому DC привязат
 > Если ваш домашний DC — DC2, и DC2 лежит, вы **не сможете** достучаться  и до DC5, даже если сам DC5 полностью исправен.  
 > У клиента просто нет валидной сессии, через которую можно было бы направить запрос.  

-По той же причине MTProxy достаточно иметь доступ к инфраструктуре Telegram в целом.  
+По той же причине MTProxy необходимо иметь доступ к инфраструктуре Telegram целиком, а не частично.  
 Cамому MTProxy всё равно, на каком DC живёт ваш аккаунт. Клиент cам договаривается о нужном DC через прокси уже после подключения.  

 ## Что такое dd и ee в контексте MTProxy?
@@ -254,6 +254,19 @@ docker compose down
 > - `docker-compose.yml` maps `./config.toml` to `/app/config.toml` (read-only)
 > - By default it publishes `443:443` and runs with dropped capabilities (only `NET_BIND_SERVICE` is added)
 > - If you really need host networking (usually only for some IPv6 setups) uncomment `network_mode: host`
+> - If you enable mutating Control API endpoints, mount a writable config directory instead of a single `config.toml` file. Telemt persists config changes with atomic `tmp + rename` writes, and a single bind-mounted file can fail with `Device or resource busy`.
+
+Example writable config mount for Control API mutations:
+```yaml
+services:
+  telemt:
+    working_dir: /run/telemt
+    volumes:
+      - ./config:/etc/telemt:rw
+    tmpfs:
+      - /run/telemt:rw,mode=1777,size=4m
+    command: /usr/local/bin/telemt /etc/telemt/config.toml
+```

 **Run without Compose**
 ```bash
@@ -235,7 +235,10 @@ curl -s http://127.0.0.1:9091/v1/users | jq -r '.data[] | "[\(.username)]", (.li

 # Telemt через Docker Compose

-**1. Отредактируйте `config.toml` в корневом каталоге репозитория (как минимум: порт, пользовательские секреты, tls_domain)**  
+**1. Создайте директорию `config/` и поместите в неё отрдеактированный `config.toml` (указав как минимум: порт, пользовательские секреты, tls_domain):**
+```bash
+mkdir config && mv config.toml config/
+```
 **2. Запустите контейнер:**
 ```bash
 docker compose up -d --build
@@ -249,7 +252,7 @@ docker compose logs -f telemt
 docker compose down
 ```
 > [!NOTE]
-> - В `docker-compose.yml` файл `./config.toml` монтируется в `/app/config.toml` (доступно только для чтения)  
+> - Директория `./config/` монтируется в `/etc/telemt/` (read-write), что позволяет API атомарно обновлять config.toml
 > - По умолчанию публикуются порты 443:443, а контейнер запускается со сброшенными привилегиями (добавлена только `NET_BIND_SERVICE`)  
 > - Если вам действительно нужна сеть хоста (обычно это требуется только для некоторых конфигураций IPv6), раскомментируйте `network_mode: host`

@@ -84,27 +84,29 @@ set_language() {
            L_INFO_KEEP_CONF="Примечание: Конфигурация сохранена. Используйте 'purge' для очистки."
            L_INFO_I_START="Начинается установка"
            L_I_STAGE_1=">>> Этап 1: Проверка окружения и зависимостей"
-            L_I_STAGE_1_5=">>> Этап 1.5: Интерактивная настройка"
+            L_I_STAGE_2=">>> Этап 2: Интерактивная настройка"
            L_I_PROMPT_DOM="\nПожалуйста, укажите домен TLS\nНажмите Enter, чтобы оставить по умолчанию [%s]: "
+            L_I_PROMPT_PORT="\nПожалуйста, укажите порт сервера\nНажмите Enter, чтобы оставить по умолчанию [%s]: "
            L_WARN_NO_TTY="Интерактивный режим недоступен (нет TTY). Используется:"
-            L_I_STAGE_2=">>> Этап 2: Загрузка архива"
+            L_I_STAGE_3=">>> Этап 3: Загрузка архива"
            L_ERR_TMP_DIR="Не удалось создать временную директорию"
            L_ERR_TMP_INV="Временная директория недействительна"
            L_INFO_FALLBACK="Сборка x86_64-v3 не найдена, откат к стандартной x86_64..."
            L_ERR_DL_FAIL="Ошибка загрузки архива"
-            L_I_STAGE_3=">>> Этап 3: Распаковка архива"
+            L_I_STAGE_4=">>> Этап 4: Распаковка архива"
            L_ERR_EXTRACT="Ошибка распаковки архива."
            L_ERR_BIN_NOT_FOUND="Бинарный файл не найден в архиве"
-            L_I_STAGE_4=">>> Этап 4: Настройка окружения (Юзер, Группа, Папки)"
-            L_I_STAGE_5=">>> Этап 5: Установка бинарного файла"
-            L_I_STAGE_6=">>> Этап 6: Генерация/Обновление конфигурации"
-            L_I_STAGE_7=">>> Этап 7: Установка и запуск службы"
+            L_I_STAGE_5=">>> Этап 5: Настройка окружения (Юзер, Группа, Папки)"
+            L_I_STAGE_6=">>> Этап 6: Установка бинарного файла"
+            L_I_STAGE_7=">>> Этап 7: Генерация/Обновление конфигурации"
+            L_I_STAGE_8=">>> Этап 8: Установка и запуск службы"
            L_OUT_WARN_H="УСТАНОВКА ЗАВЕРШЕНА С ПРЕДУПРЕЖДЕНИЯМИ"
            L_OUT_WARN_D="Служба установлена, но не запустилась.\nПожалуйста, проверьте логи.\n"
            L_OUT_SUCC_H="УСТАНОВКА УСПЕШНО ЗАВЕРШЕНА"
            L_OUT_UNINST_H="УДАЛЕНИЕ ЗАВЕРШЕНО"
            L_OUT_LINK="Ваша ссылка для подключения к Telegram Proxy:\n"
            L_ERR_INCORR_ROOT_LOGIN="Используйте 'su -' или 'sudo -i' для входа под пользователем root"
+            L_OUT_LOGS="Чтобы посмотреть логи (в случае проблем), используйте команду:"
            ;;
        *)
            L_ERR_DOMAIN_REQ="requires a domain argument."
@@ -159,27 +161,29 @@ set_language() {
            L_INFO_KEEP_CONF="Note: Configuration kept. Run with 'purge' to remove completely."
            L_INFO_I_START="Starting installation of"
            L_I_STAGE_1=">>> Stage 1: Verifying environment and dependencies"
-            L_I_STAGE_1_5=">>> Stage 1.5: Interactive Setup"
+            L_I_STAGE_2=">>> Stage 2: Interactive Setup"
            L_I_PROMPT_DOM="\nPlease specify the TLS Domain\nPress Enter to keep default [%s]: "
+            L_I_PROMPT_PORT="\nPlease specify the Server Port\nPress Enter to keep default [%s]: "
            L_WARN_NO_TTY="Interactive mode unavailable (no TTY). Using:"
-            L_I_STAGE_2=">>> Stage 2: Downloading archive"
+            L_I_STAGE_3=">>> Stage 3: Downloading archive"
            L_ERR_TMP_DIR="Temp directory creation failed"
            L_ERR_TMP_INV="Temp directory is invalid or was not created"
            L_INFO_FALLBACK="x86_64-v3 build not found, falling back to standard x86_64..."
            L_ERR_DL_FAIL="Download failed"
-            L_I_STAGE_3=">>> Stage 3: Extracting archive"
+            L_I_STAGE_4=">>> Stage 4: Extracting archive"
            L_ERR_EXTRACT="Extraction failed."
            L_ERR_BIN_NOT_FOUND="Binary not found in archive"
-            L_I_STAGE_4=">>> Stage 4: Setting up environment (User, Group, Directories)"
-            L_I_STAGE_5=">>> Stage 5: Installing binary"
-            L_I_STAGE_6=">>> Stage 6: Generating/Updating configuration"
-            L_I_STAGE_7=">>> Stage 7: Installing and starting service"
+            L_I_STAGE_5=">>> Stage 5: Setting up environment (User, Group, Directories)"
+            L_I_STAGE_6=">>> Stage 6: Installing binary"
+            L_I_STAGE_7=">>> Stage 7: Generating/Updating configuration"
+            L_I_STAGE_8=">>> Stage 8: Installing and starting service"
            L_OUT_WARN_H="INSTALLATION COMPLETED WITH WARNINGS"
            L_OUT_WARN_D="The service was installed but failed to start.\nPlease check the logs to determine the issue.\n"
            L_OUT_SUCC_H="INSTALLATION SUCCESS"
            L_OUT_UNINST_H="UNINSTALLATION COMPLETE"
            L_OUT_LINK="Your Telegram Proxy connection link:\n"
            L_ERR_INCORR_ROOT_LOGIN="Use 'su -' or 'sudo -i' to login under root"
+            L_OUT_LOGS="To view logs (in case of issues), use the following command:"
            ;;
    esac
 }
@@ -267,7 +271,10 @@ say() {
    if [ "$#" -eq 0 ] || [ -z "${1:-}" ]; then
        printf '\n'
    else
-        printf '[INFO] %s\n' "$*"
+        case "$*" in
+            \[*\]*) printf '%s\n' "$*" ;;
+            *) printf '[INFO] %s\n' "$*" ;;
+        esac
    fi
 }
 die() { printf '[ERROR] %s\n' "$*" >&2; exit 1; }
@@ -392,7 +399,7 @@ verify_common() {

    if [ "$(id -u)" -eq 0 ]; then
        SUDO=""
-        if [ "$(id -u)" -ne 0 ]; then
+        if [ "${USER:-}" != "root" ] && [ "${LOGNAME:-}" != "root" ]; then
            die "$L_ERR_INCORR_ROOT_LOGIN"
        fi
    else
@@ -525,9 +532,9 @@ setup_dirs() {

 stop_service() {
    svc="$(get_svc_mgr)"
-    if [ "$svc" = "systemd" ] && systemctl is-active --quiet "$SERVICE_NAME" 2>/dev/null; then
+    if [ "$svc" = "systemd" ] && $SUDO systemctl is-active --quiet "$SERVICE_NAME" 2>/dev/null; then
        $SUDO systemctl stop "$SERVICE_NAME" 2>/dev/null || true
-    elif [ "$svc" = "openrc" ] && rc-service "$SERVICE_NAME" status >/dev/null 2>&1; then
+    elif [ "$svc" = "openrc" ] && $SUDO rc-service "$SERVICE_NAME" status >/dev/null 2>&1; then
        $SUDO rc-service "$SERVICE_NAME" stop 2>/dev/null || true
    fi
 }
@@ -830,10 +837,36 @@ case "$ACTION" in
            fi
        fi

-        check_port_availability
+        if [ "$PORT_PROVIDED" -eq 0 ] || [ "$DOMAIN_PROVIDED" -eq 0 ]; then
+            say "$L_I_STAGE_2"
+        fi
+
+        if [ "$PORT_PROVIDED" -eq 0 ]; then
+            if [ -t 0 ] || [ -c /dev/tty ]; then
+                while true; do
+                    printf "$L_I_PROMPT_PORT" "$SERVER_PORT"
+                    read -r input_port </dev/tty || input_port=""
+                    if [ -z "$input_port" ]; then
+                        break
+                    fi
+                    case "$input_port" in
+                        *[!0-9]*) printf '[ERROR] %s\n' "$L_ERR_PORT_NUM" >&2; continue ;;
+                    esac
+                    port_num="$(printf '%s\n' "$input_port" | sed 's/^0*//')"
+                    [ -z "$port_num" ] && port_num="0"
+                    if [ "${#port_num}" -gt 5 ] || [ "$port_num" -lt 1 ] || [ "$port_num" -gt 65535 ]; then
+                        printf '[ERROR] %s\n' "$L_ERR_PORT_RANGE" >&2; continue
+                    fi
+                    SERVER_PORT="$port_num"
+                    break
+                done
+            else
+                say "[WARNING] $L_WARN_NO_TTY $SERVER_PORT"
+            fi
+            PORT_PROVIDED=1
+        fi

        if [ "$DOMAIN_PROVIDED" -eq 0 ]; then
-            say "$L_I_STAGE_1_5"
            if [ -t 0 ] || [ -c /dev/tty ]; then
                printf "$L_I_PROMPT_DOM" "$TLS_DOMAIN"
                read -r input_domain </dev/tty || input_domain=""
@@ -846,6 +879,8 @@ case "$ACTION" in
            DOMAIN_PROVIDED=1
        fi

+        check_port_availability
+
        if [ "$TARGET_VERSION" != "latest" ]; then
            TARGET_VERSION="${TARGET_VERSION#v}"
        fi
@@ -859,7 +894,7 @@ case "$ACTION" in
            DL_URL="https://github.com/${REPO}/releases/download/${TARGET_VERSION}/${FILE_NAME}"
        fi

-        say "$L_I_STAGE_2"
+        say "$L_I_STAGE_3"
        TEMP_DIR="$(mktemp -d)" || die "$L_ERR_TMP_DIR"
        if [ -z "$TEMP_DIR" ] || [ ! -d "$TEMP_DIR" ]; then
            die "$L_ERR_TMP_INV"
@@ -881,7 +916,7 @@ case "$ACTION" in
            fi
        fi

-        say "$L_I_STAGE_3"
+        say "$L_I_STAGE_4"
        if ! gzip -dc "${TEMP_DIR}/${FILE_NAME}" | tar -xf - -C "$TEMP_DIR" 2>/dev/null; then
            die "$L_ERR_EXTRACT"
        fi
@@ -889,16 +924,16 @@ case "$ACTION" in
        EXTRACTED_BIN="$(find "$TEMP_DIR" -type f -name "$BIN_NAME" -print 2>/dev/null | head -n 1 || true)"
        [ -n "$EXTRACTED_BIN" ] || die "$L_ERR_BIN_NOT_FOUND"

-        say "$L_I_STAGE_4"
+        say "$L_I_STAGE_5"
        ensure_user_group; setup_dirs; stop_service

-        say "$L_I_STAGE_5"
+        say "$L_I_STAGE_6"
        install_binary "$EXTRACTED_BIN" "${INSTALL_DIR}/${BIN_NAME}"

-        say "$L_I_STAGE_6"
+        say "$L_I_STAGE_7"
        install_config

-        say "$L_I_STAGE_7"
+        say "$L_I_STAGE_8"
        install_service

        if [ "${SERVICE_START_FAILED:-0}" -eq 1 ]; then
@@ -927,6 +962,15 @@ case "$ACTION" in
        printf '%b\n' "$L_OUT_LINK"
        printf '  tg://proxy?server=%s&port=%s&secret=%s\n\n' "$SERVER_IP" "$SERVER_PORT" "$CLIENT_SECRET"

+        svc="$(get_svc_mgr)"
+        if [ "$svc" = "systemd" ]; then
+            printf '%s\n' "$L_OUT_LOGS"
+            printf '  sudo journalctl -u %s -f\n\n' "$SERVICE_NAME"
+        elif [ "$svc" = "openrc" ]; then
+            printf '%s\n' "$L_OUT_LOGS"
+            printf '  sudo tail -f /var/log/messages /var/log/syslog 2>/dev/null | grep -i %s\n\n' "$SERVICE_NAME"
+        fi
+
        printf '====================================================================\n'
        ;;
 esac
@@ -7,17 +7,19 @@ use hyper::header::IF_MATCH;
 use serde::Serialize;
 use sha2::{Digest, Sha256};

-use crate::config::ProxyConfig;
+use crate::config::{ProxyConfig, RateLimitBps};

 use super::model::ApiFailure;

 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub(super) enum AccessSection {
    Users,
+    UserEnabled,
    UserAdTags,
    UserMaxTcpConns,
    UserExpirations,
    UserDataQuota,
+    UserRateLimits,
    UserMaxUniqueIps,
 }

@@ -25,10 +27,12 @@ impl AccessSection {
    fn table_name(self) -> &'static str {
        match self {
            Self::Users => "access.users",
+            Self::UserEnabled => "access.user_enabled",
            Self::UserAdTags => "access.user_ad_tags",
            Self::UserMaxTcpConns => "access.user_max_tcp_conns",
            Self::UserExpirations => "access.user_expirations",
            Self::UserDataQuota => "access.user_data_quota",
+            Self::UserRateLimits => "access.user_rate_limits",
            Self::UserMaxUniqueIps => "access.user_max_unique_ips",
        }
    }
@@ -133,6 +137,15 @@ fn render_access_section(cfg: &ProxyConfig, section: AccessSection) -> Result<St
                .collect();
            serialize_table_body(&rows)?
        }
+        AccessSection::UserEnabled => {
+            let rows: BTreeMap<String, bool> = cfg
+                .access
+                .user_enabled
+                .iter()
+                .map(|(key, value)| (key.clone(), *value))
+                .collect();
+            serialize_table_body(&rows)?
+        }
        AccessSection::UserAdTags => {
            let rows: BTreeMap<String, String> = cfg
                .access
@@ -169,6 +182,15 @@ fn render_access_section(cfg: &ProxyConfig, section: AccessSection) -> Result<St
                .collect();
            serialize_table_body(&rows)?
        }
+        AccessSection::UserRateLimits => {
+            let rows: BTreeMap<String, RateLimitBps> = cfg
+                .access
+                .user_rate_limits
+                .iter()
+                .map(|(key, value)| (key.clone(), *value))
+                .collect();
+            serialize_rate_limit_body(&rows)?
+        }
        AccessSection::UserMaxUniqueIps => {
            let rows: BTreeMap<String, usize> = cfg
                .access
@@ -193,10 +215,12 @@ fn render_access_section(cfg: &ProxyConfig, section: AccessSection) -> Result<St
 fn access_section_is_empty(cfg: &ProxyConfig, section: AccessSection) -> bool {
    match section {
        AccessSection::Users => cfg.access.users.is_empty(),
+        AccessSection::UserEnabled => cfg.access.user_enabled.is_empty(),
        AccessSection::UserAdTags => cfg.access.user_ad_tags.is_empty(),
        AccessSection::UserMaxTcpConns => cfg.access.user_max_tcp_conns.is_empty(),
        AccessSection::UserExpirations => cfg.access.user_expirations.is_empty(),
        AccessSection::UserDataQuota => cfg.access.user_data_quota.is_empty(),
+        AccessSection::UserRateLimits => cfg.access.user_rate_limits.is_empty(),
        AccessSection::UserMaxUniqueIps => cfg.access.user_max_unique_ips.is_empty(),
    }
 }
@@ -206,6 +230,28 @@ fn serialize_table_body<T: Serialize>(value: &T) -> Result<String, ApiFailure> {
        .map_err(|e| ApiFailure::internal(format!("failed to serialize access section: {}", e)))
 }

+fn serialize_rate_limit_body(rows: &BTreeMap<String, RateLimitBps>) -> Result<String, ApiFailure> {
+    let mut out = String::new();
+    for (key, value) in rows {
+        let key = serialize_toml_key(key)?;
+        out.push_str(&format!(
+            "{key} = {{ up_bps = {}, down_bps = {} }}\n",
+            value.up_bps, value.down_bps
+        ));
+    }
+    Ok(out)
+}
+
+fn serialize_toml_key(key: &str) -> Result<String, ApiFailure> {
+    let mut row = BTreeMap::new();
+    row.insert(key.to_string(), 0_u8);
+    let rendered = serialize_table_body(&row)?;
+    rendered
+        .split_once(" = ")
+        .map(|(key, _)| key.to_string())
+        .ok_or_else(|| ApiFailure::internal("failed to serialize TOML key"))
+}
+
 fn upsert_toml_table(source: &str, table_name: &str, replacement: &str) -> String {
    if let Some((start, end)) = find_toml_table_bounds(source, table_name) {
        let mut out = String::with_capacity(source.len() + replacement.len());
@@ -285,3 +331,26 @@ fn write_atomic_sync(path: &Path, contents: &str) -> std::io::Result<()> {
    }
    write_result
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn render_user_rate_limits_section() {
+        let mut cfg = ProxyConfig::default();
+        cfg.access.user_rate_limits.insert(
+            "alice".to_string(),
+            RateLimitBps {
+                up_bps: 1024,
+                down_bps: 2048,
+            },
+        );
+
+        let rendered = render_access_section(&cfg, AccessSection::UserRateLimits)
+            .expect("section must render");
+
+        assert!(rendered.starts_with("[access.user_rate_limits]\n"));
+        assert!(rendered.contains("alice = { up_bps = 1024, down_bps = 2048 }"));
+    }
+}
@@ -1,6 +1,7 @@
 use http_body_util::{BodyExt, Full};
 use hyper::StatusCode;
 use hyper::body::{Bytes, Incoming};
+use hyper::header::ALLOW;
 use serde::Serialize;
 use serde::de::DeserializeOwned;

@@ -25,6 +26,8 @@ pub(super) fn success_response<T: Serialize>(
 }

 pub(super) fn error_response(request_id: u64, failure: ApiFailure) -> hyper::Response<Full<Bytes>> {
+    let status = failure.status;
+    let allow = failure.allow;
    let payload = ErrorResponse {
        ok: false,
        error: ErrorBody {
@@ -40,11 +43,13 @@ pub(super) fn error_response(request_id: u64, failure: ApiFailure) -> hyper::Res
        )
        .into_bytes()
    });
-    hyper::Response::builder()
-        .status(failure.status)
-        .header("content-type", "application/json; charset=utf-8")
-        .body(Full::new(Bytes::from(body)))
-        .unwrap()
+    let mut builder = hyper::Response::builder()
+        .status(status)
+        .header("content-type", "application/json; charset=utf-8");
+    if let Some(allow) = allow {
+        builder = builder.header(ALLOW, allow);
+    }
+    builder.body(Full::new(Bytes::from(body))).unwrap()
 }

 pub(super) async fn read_json<T: DeserializeOwned>(
@@ -22,6 +22,7 @@ use tracing::{debug, info, warn};
 use crate::config::{ApiGrayAction, ProxyConfig};
 use crate::ip_tracker::UserIpTracker;
 use crate::proxy::route_mode::RouteRuntimeController;
+use crate::proxy::shared_state::ProxySharedState;
 use crate::startup::StartupTracker;
 use crate::stats::Stats;
 use crate::transport::UpstreamManager;
@@ -41,7 +42,9 @@ mod runtime_watch;
 mod runtime_zero;
 mod users;

-use config_store::{current_revision, load_config_from_disk, parse_if_match};
+use config_store::{
+    current_revision, ensure_expected_revision, load_config_from_disk, parse_if_match,
+};
 use events::ApiEventStore;
 use http_utils::{error_response, read_json, read_optional_json, success_response};
 use model::{
@@ -49,9 +52,10 @@ use model::{
    PatchUserRequest, ResetUserQuotaResponse, RotateSecretRequest, SummaryData, UserActiveIps,
    is_valid_username,
 };
+use patch::Patch;
 use runtime_edge::{
    EdgeConnectionsCacheEntry, build_runtime_connections_summary_data,
-    build_runtime_events_recent_data,
+    build_runtime_events_recent_data, build_runtime_tls_fingerprints_data,
 };
 use runtime_init::build_runtime_initialization_data;
 use runtime_min::{
@@ -68,11 +72,18 @@ use runtime_zero::{
    build_limits_effective_data, build_runtime_gates_data, build_security_posture_data,
    build_system_info_data,
 };
-use users::{create_user, delete_user, patch_user, rotate_secret, users_from_config};
+use users::{
+    build_user_quota_list, create_user, delete_user, patch_user, rotate_secret, set_user_enabled,
+    users_from_config,
+};

 const API_MAX_CONTROL_CONNECTIONS: usize = 1024;
 const API_HTTP_CONNECTION_TIMEOUT: Duration = Duration::from_secs(15);
 const ROUTE_USERNAME_ERROR: &str = "username must match [A-Za-z0-9_.-] and be 1..64 chars";
+const ALLOW_GET: &str = "GET";
+const ALLOW_POST: &str = "POST";
+const ALLOW_GET_POST: &str = "GET, POST";
+const ALLOW_GET_PATCH_DELETE: &str = "GET, PATCH, DELETE";

 pub(super) struct ApiRuntimeState {
    pub(super) process_started_at_epoch_secs: u64,
@@ -99,6 +110,7 @@ pub(super) struct ApiShared {
    pub(super) runtime_state: Arc<ApiRuntimeState>,
    pub(super) startup_tracker: Arc<StartupTracker>,
    pub(super) route_runtime: Arc<RouteRuntimeController>,
+    pub(super) proxy_shared: Arc<ProxySharedState>,
 }

 impl ApiShared {
@@ -123,12 +135,67 @@ fn parse_route_username(user: &str) -> Result<&str, ApiFailure> {
    }
 }

+fn user_action_route_matches(path: &str, suffix: &str) -> bool {
+    path.strip_prefix("/v1/users/")
+        .and_then(|path| path.strip_suffix(suffix))
+        .map(|user| !user.is_empty() && !user.contains('/'))
+        .unwrap_or(false)
+}
+
+fn allowed_methods_for_path(path: &str) -> Option<&'static str> {
+    match path {
+        "/v1/health"
+        | "/v1/health/ready"
+        | "/v1/system/info"
+        | "/v1/runtime/gates"
+        | "/v1/runtime/initialization"
+        | "/v1/limits/effective"
+        | "/v1/security/posture"
+        | "/v1/security/whitelist"
+        | "/v1/stats/summary"
+        | "/v1/stats/zero/all"
+        | "/v1/stats/upstreams"
+        | "/v1/stats/minimal/all"
+        | "/v1/stats/me-writers"
+        | "/v1/stats/dcs"
+        | "/v1/runtime/me-pool-state"
+        | "/v1/runtime/me_pool_state"
+        | "/v1/runtime/me-quality"
+        | "/v1/runtime/me_quality"
+        | "/v1/runtime/upstream-quality"
+        | "/v1/runtime/upstream_quality"
+        | "/v1/runtime/nat-stun"
+        | "/v1/runtime/nat_stun"
+        | "/v1/runtime/me-selftest"
+        | "/v1/runtime/connections/summary"
+        | "/v1/runtime/events/recent"
+        | "/v1/runtime/tls-fingerprints"
+        | "/v1/stats/users/active-ips"
+        | "/v1/stats/users/quota"
+        | "/v1/stats/users" => Some(ALLOW_GET),
+        "/v1/users" => Some(ALLOW_GET_POST),
+        _ if user_action_route_matches(path, "/reset-quota") => Some(ALLOW_POST),
+        _ if user_action_route_matches(path, "/rotate-secret") => Some(ALLOW_POST),
+        _ if user_action_route_matches(path, "/enable") => Some(ALLOW_POST),
+        _ if user_action_route_matches(path, "/disable") => Some(ALLOW_POST),
+        _ if path
+            .strip_prefix("/v1/users/")
+            .map(|user| !user.is_empty() && !user.contains('/'))
+            .unwrap_or(false) =>
+        {
+            Some(ALLOW_GET_PATCH_DELETE)
+        }
+        _ => None,
+    }
+}
+
 pub async fn serve(
    listen: SocketAddr,
    stats: Arc<Stats>,
    ip_tracker: Arc<UserIpTracker>,
    me_pool: Arc<RwLock<Option<Arc<MePool>>>>,
    route_runtime: Arc<RouteRuntimeController>,
+    proxy_shared: Arc<ProxySharedState>,
    upstream_manager: Arc<UpstreamManager>,
    config_rx: watch::Receiver<Arc<ProxyConfig>>,
    admission_rx: watch::Receiver<bool>,
@@ -178,6 +245,7 @@ pub async fn serve(
        runtime_state: runtime_state.clone(),
        startup_tracker,
        route_runtime,
+        proxy_shared,
    });

    spawn_runtime_watchers(
@@ -433,22 +501,22 @@ async fn handle(
                let data = build_dcs_data(shared.as_ref(), api_cfg).await;
                Ok(success_response(StatusCode::OK, data, revision))
            }
-            ("GET", "/v1/runtime/me_pool_state") => {
+            ("GET", "/v1/runtime/me-pool-state") | ("GET", "/v1/runtime/me_pool_state") => {
                let revision = current_revision(&shared.config_path).await?;
                let data = build_runtime_me_pool_state_data(shared.as_ref()).await;
                Ok(success_response(StatusCode::OK, data, revision))
            }
-            ("GET", "/v1/runtime/me_quality") => {
+            ("GET", "/v1/runtime/me-quality") | ("GET", "/v1/runtime/me_quality") => {
                let revision = current_revision(&shared.config_path).await?;
                let data = build_runtime_me_quality_data(shared.as_ref()).await;
                Ok(success_response(StatusCode::OK, data, revision))
            }
-            ("GET", "/v1/runtime/upstream_quality") => {
+            ("GET", "/v1/runtime/upstream-quality") | ("GET", "/v1/runtime/upstream_quality") => {
                let revision = current_revision(&shared.config_path).await?;
                let data = build_runtime_upstream_quality_data(shared.as_ref()).await;
                Ok(success_response(StatusCode::OK, data, revision))
            }
-            ("GET", "/v1/runtime/nat_stun") => {
+            ("GET", "/v1/runtime/nat-stun") | ("GET", "/v1/runtime/nat_stun") => {
                let revision = current_revision(&shared.config_path).await?;
                let data = build_runtime_nat_stun_data(shared.as_ref()).await;
                Ok(success_response(StatusCode::OK, data, revision))
@@ -473,6 +541,15 @@ async fn handle(
                );
                Ok(success_response(StatusCode::OK, data, revision))
            }
+            ("GET", "/v1/runtime/tls-fingerprints") => {
+                let revision = current_revision(&shared.config_path).await?;
+                let data = build_runtime_tls_fingerprints_data(
+                    shared.as_ref(),
+                    cfg.as_ref(),
+                    query.as_deref(),
+                );
+                Ok(success_response(StatusCode::OK, data, revision))
+            }
            ("GET", "/v1/stats/users/active-ips") => {
                let revision = current_revision(&shared.config_path).await?;
                let usernames: Vec<_> = cfg.access.users.keys().cloned().collect();
@@ -504,6 +581,12 @@ async fn handle(
                .await;
                Ok(success_response(StatusCode::OK, users, revision))
            }
+            ("GET", "/v1/stats/users/quota") => {
+                let revision = current_revision(&shared.config_path).await?;
+                let disk_cfg = load_config_from_disk(&shared.config_path).await?;
+                let data = build_user_quota_list(&disk_cfg, shared.stats.as_ref());
+                Ok(success_response(StatusCode::OK, data, revision))
+            }
            ("POST", "/v1/users") => {
                if api_cfg.read_only {
                    return Ok(error_response(
@@ -517,6 +600,7 @@ async fn handle(
                }
                let expected_revision = parse_if_match(req.headers());
                let body = read_json::<CreateUserRequest>(req.into_body(), body_limit).await?;
+                let requested_enabled = body.enabled;
                let result = create_user(body, expected_revision, &shared).await;
                let (mut data, revision) = match result {
                    Ok(ok) => ok,
@@ -529,6 +613,25 @@ async fn handle(
                };
                let runtime_cfg = config_rx.borrow().clone();
                data.user.in_runtime = runtime_cfg.access.users.contains_key(&data.user.username);
+                if let Some(enabled) = requested_enabled {
+                    shared
+                        .proxy_shared
+                        .set_user_enabled(&data.user.username, enabled);
+                    if !enabled {
+                        let cancelled = shared
+                            .proxy_shared
+                            .cancel_user_sessions(&data.user.username);
+                        if cancelled > 0 {
+                            shared.runtime_events.record(
+                                "api.user.disable.runtime",
+                                format!(
+                                    "username={} cancelled_sessions={}",
+                                    data.user.username, cancelled
+                                ),
+                            );
+                        }
+                    }
+                }
                shared.runtime_events.record(
                    "api.user.create.ok",
                    format!("username={}", data.user.username),
@@ -541,6 +644,99 @@ async fn handle(
                Ok(success_response(status, data, revision))
            }
            _ => {
+                if method == Method::POST
+                    && let Some(base_user) = normalized_path
+                        .strip_prefix("/v1/users/")
+                        .and_then(|path| path.strip_suffix("/enable"))
+                    && !base_user.is_empty()
+                    && !base_user.contains('/')
+                {
+                    let base_user = parse_route_username(base_user)?;
+                    if api_cfg.read_only {
+                        return Ok(error_response(
+                            request_id,
+                            ApiFailure::new(
+                                StatusCode::FORBIDDEN,
+                                "read_only",
+                                "API runs in read-only mode",
+                            ),
+                        ));
+                    }
+                    let expected_revision = parse_if_match(req.headers());
+                    let result =
+                        set_user_enabled(base_user, true, expected_revision, &shared).await;
+                    let (mut data, revision) = match result {
+                        Ok(ok) => ok,
+                        Err(error) => {
+                            shared.runtime_events.record(
+                                "api.user.enable.failed",
+                                format!("username={} code={}", base_user, error.code),
+                            );
+                            return Err(error);
+                        }
+                    };
+                    let runtime_cfg = config_rx.borrow().clone();
+                    data.in_runtime = runtime_cfg.access.users.contains_key(&data.username);
+                    shared.proxy_shared.set_user_enabled(base_user, true);
+                    shared
+                        .runtime_events
+                        .record("api.user.enable.ok", format!("username={}", base_user));
+                    let status = if data.in_runtime {
+                        StatusCode::OK
+                    } else {
+                        StatusCode::ACCEPTED
+                    };
+                    return Ok(success_response(status, data, revision));
+                }
+                if method == Method::POST
+                    && let Some(base_user) = normalized_path
+                        .strip_prefix("/v1/users/")
+                        .and_then(|path| path.strip_suffix("/disable"))
+                    && !base_user.is_empty()
+                    && !base_user.contains('/')
+                {
+                    let base_user = parse_route_username(base_user)?;
+                    if api_cfg.read_only {
+                        return Ok(error_response(
+                            request_id,
+                            ApiFailure::new(
+                                StatusCode::FORBIDDEN,
+                                "read_only",
+                                "API runs in read-only mode",
+                            ),
+                        ));
+                    }
+                    let expected_revision = parse_if_match(req.headers());
+                    let result =
+                        set_user_enabled(base_user, false, expected_revision, &shared).await;
+                    let (mut data, revision) = match result {
+                        Ok(ok) => ok,
+                        Err(error) => {
+                            shared.runtime_events.record(
+                                "api.user.disable.failed",
+                                format!("username={} code={}", base_user, error.code),
+                            );
+                            return Err(error);
+                        }
+                    };
+                    let runtime_cfg = config_rx.borrow().clone();
+                    data.in_runtime = runtime_cfg.access.users.contains_key(&data.username);
+                    let newly_disabled = shared.proxy_shared.set_user_enabled(base_user, false);
+                    let cancelled = shared.proxy_shared.cancel_user_sessions(base_user);
+                    shared.runtime_events.record(
+                        "api.user.disable.ok",
+                        format!(
+                            "username={} newly_disabled={} cancelled_sessions={}",
+                            base_user, newly_disabled, cancelled
+                        ),
+                    );
+                    let status = if data.in_runtime {
+                        StatusCode::OK
+                    } else {
+                        StatusCode::ACCEPTED
+                    };
+                    return Ok(success_response(status, data, revision));
+                }
                if method == Method::POST
                    && let Some(user) = normalized_path
                        .strip_prefix("/v1/users/")
@@ -559,6 +755,16 @@ async fn handle(
                            ),
                        ));
                    }
+                    let expected_revision = parse_if_match(req.headers());
+                    let disk_cfg = load_config_from_disk(&shared.config_path).await?;
+                    ensure_expected_revision(&shared.config_path, expected_revision.as_deref())
+                        .await?;
+                    if !disk_cfg.access.users.contains_key(user) {
+                        return Ok(error_response(
+                            request_id,
+                            ApiFailure::new(StatusCode::NOT_FOUND, "not_found", "User not found"),
+                        ));
+                    }
                    let snapshot = match crate::quota_state::reset_user_quota(
                        &shared.quota_state_path,
                        shared.stats.as_ref(),
@@ -688,6 +894,11 @@ async fn handle(
                        let expected_revision = parse_if_match(req.headers());
                        let body =
                            read_json::<PatchUserRequest>(req.into_body(), body_limit).await?;
+                        let enabled_update = match &body.enabled {
+                            Patch::Unchanged => None,
+                            Patch::Remove => Some(true),
+                            Patch::Set(enabled) => Some(*enabled),
+                        };
                        let result = patch_user(user, body, expected_revision, &shared).await;
                        let (mut data, revision) = match result {
                            Ok(ok) => ok,
@@ -701,6 +912,22 @@ async fn handle(
                        };
                        let runtime_cfg = config_rx.borrow().clone();
                        data.in_runtime = runtime_cfg.access.users.contains_key(&data.username);
+                        if let Some(enabled) = enabled_update {
+                            shared
+                                .proxy_shared
+                                .set_user_enabled(&data.username, enabled);
+                            if !enabled {
+                                let cancelled =
+                                    shared.proxy_shared.cancel_user_sessions(&data.username);
+                                shared.runtime_events.record(
+                                    "api.user.disable.runtime",
+                                    format!(
+                                        "username={} cancelled_sessions={}",
+                                        data.username, cancelled
+                                    ),
+                                );
+                            }
+                        }
                        shared
                            .runtime_events
                            .record("api.user.patch.ok", format!("username={}", data.username));
@@ -734,9 +961,12 @@ async fn handle(
                                return Err(error);
                            }
                        };
-                        shared
-                            .runtime_events
-                            .record("api.user.delete.ok", format!("username={}", deleted_user));
+                        shared.proxy_shared.set_user_enabled(&deleted_user, true);
+                        let cancelled = shared.proxy_shared.cancel_user_sessions(&deleted_user);
+                        shared.runtime_events.record(
+                            "api.user.delete.ok",
+                            format!("username={} cancelled_sessions={}", deleted_user, cancelled),
+                        );
                        let runtime_cfg = config_rx.borrow().clone();
                        let in_runtime = runtime_cfg.access.users.contains_key(&deleted_user);
                        let response = DeleteUserResponse {
@@ -753,16 +983,18 @@ async fn handle(
                    if method == Method::POST {
                        return Ok(error_response(
                            request_id,
-                            ApiFailure::new(StatusCode::NOT_FOUND, "not_found", "Route not found"),
+                            ApiFailure::method_not_allowed(ALLOW_GET_PATCH_DELETE),
                        ));
                    }
                    return Ok(error_response(
                        request_id,
-                        ApiFailure::new(
-                            StatusCode::METHOD_NOT_ALLOWED,
-                            "method_not_allowed",
-                            "Unsupported HTTP method for this route",
-                        ),
+                        ApiFailure::method_not_allowed(ALLOW_GET_PATCH_DELETE),
+                    ));
+                }
+                if let Some(allow) = allowed_methods_for_path(normalized_path) {
+                    return Ok(error_response(
+                        request_id,
+                        ApiFailure::method_not_allowed(allow),
                    ));
                }
                debug!(
@@ -15,6 +15,7 @@ pub(super) struct ApiFailure {
    pub(super) status: StatusCode,
    pub(super) code: &'static str,
    pub(super) message: String,
+    pub(super) allow: Option<&'static str>,
 }

 impl ApiFailure {
@@ -23,6 +24,7 @@ impl ApiFailure {
            status,
            code,
            message: message.into(),
+            allow: None,
        }
    }

@@ -33,6 +35,15 @@ impl ApiFailure {
    pub(super) fn bad_request(message: impl Into<String>) -> Self {
        Self::new(StatusCode::BAD_REQUEST, "bad_request", message)
    }
+
+    pub(super) fn method_not_allowed(allow: &'static str) -> Self {
+        Self {
+            status: StatusCode::METHOD_NOT_ALLOWED,
+            code: "method_not_allowed",
+            message: "Unsupported HTTP method for this route".to_string(),
+            allow: Some(allow),
+        }
+    }
 }

 #[derive(Serialize)]
@@ -468,11 +479,14 @@ pub(super) struct TlsDomainLink {
 #[derive(Serialize)]
 pub(super) struct UserInfo {
    pub(super) username: String,
+    pub(super) enabled: bool,
    pub(super) in_runtime: bool,
    pub(super) user_ad_tag: Option<String>,
    pub(super) max_tcp_conns: Option<usize>,
    pub(super) expiration_rfc3339: Option<String>,
    pub(super) data_quota_bytes: Option<u64>,
+    pub(super) rate_limit_up_bps: Option<u64>,
+    pub(super) rate_limit_down_bps: Option<u64>,
    pub(super) max_unique_ips: Option<usize>,
    pub(super) current_connections: u64,
    pub(super) active_unique_ips: usize,
@@ -508,6 +522,19 @@ pub(super) struct ResetUserQuotaResponse {
    pub(super) last_reset_epoch_secs: u64,
 }

+#[derive(Serialize)]
+pub(super) struct UserQuotaListData {
+    pub(super) users: Vec<UserQuotaEntry>,
+}
+
+#[derive(Serialize)]
+pub(super) struct UserQuotaEntry {
+    pub(super) username: String,
+    pub(super) data_quota_bytes: u64,
+    pub(super) used_bytes: u64,
+    pub(super) last_reset_epoch_secs: u64,
+}
+
 #[derive(Deserialize)]
 pub(super) struct CreateUserRequest {
    pub(super) username: String,
@@ -516,7 +543,10 @@ pub(super) struct CreateUserRequest {
    pub(super) max_tcp_conns: Option<usize>,
    pub(super) expiration_rfc3339: Option<String>,
    pub(super) data_quota_bytes: Option<u64>,
+    pub(super) rate_limit_up_bps: Option<u64>,
+    pub(super) rate_limit_down_bps: Option<u64>,
    pub(super) max_unique_ips: Option<usize>,
+    pub(super) enabled: Option<bool>,
 }

 #[derive(Deserialize)]
@@ -531,7 +561,13 @@ pub(super) struct PatchUserRequest {
    #[serde(default, deserialize_with = "patch_field")]
    pub(super) data_quota_bytes: Patch<u64>,
    #[serde(default, deserialize_with = "patch_field")]
+    pub(super) rate_limit_up_bps: Patch<u64>,
+    #[serde(default, deserialize_with = "patch_field")]
+    pub(super) rate_limit_down_bps: Patch<u64>,
+    #[serde(default, deserialize_with = "patch_field")]
    pub(super) max_unique_ips: Patch<usize>,
+    #[serde(default, deserialize_with = "patch_field")]
+    pub(super) enabled: Patch<bool>,
 }

 #[derive(Default, Deserialize)]
@@ -114,7 +114,9 @@ mod tests {
            "secret": "00112233445566778899aabbccddeeff",
            "max_tcp_conns": 0,
            "max_unique_ips": null,
-            "data_quota_bytes": 1024
+            "data_quota_bytes": 1024,
+            "rate_limit_up_bps": 4096,
+            "rate_limit_down_bps": null
        }"#;
        let req: PatchUserRequest = serde_json::from_str(raw).expect("valid json");
        assert_eq!(
@@ -124,6 +126,8 @@ mod tests {
        assert!(matches!(req.max_tcp_conns, Patch::Set(0)));
        assert!(matches!(req.max_unique_ips, Patch::Remove));
        assert!(matches!(req.data_quota_bytes, Patch::Set(1024)));
+        assert!(matches!(req.rate_limit_up_bps, Patch::Set(4096)));
+        assert!(matches!(req.rate_limit_down_bps, Patch::Remove));
        assert!(matches!(req.expiration_rfc3339, Patch::Unchanged));
        assert!(matches!(req.user_ad_tag, Patch::Unchanged));
    }
@@ -12,6 +12,8 @@ const FEATURE_DISABLED_REASON: &str = "feature_disabled";
 const SOURCE_UNAVAILABLE_REASON: &str = "source_unavailable";
 const EVENTS_DEFAULT_LIMIT: usize = 50;
 const EVENTS_MAX_LIMIT: usize = 1000;
+const TLS_FINGERPRINTS_MAX_LIMIT: usize = 1000;
+const RUNTIME_EDGE_RETENTION_MAX_MINUTES: u64 = 24 * 60;

 #[derive(Clone, Serialize)]
 pub(super) struct RuntimeEdgeConnectionUserData {
@@ -90,6 +92,44 @@ pub(super) struct RuntimeEdgeEventsData {
    pub(super) data: Option<RuntimeEdgeEventsPayload>,
 }

+#[derive(Serialize)]
+pub(super) struct RuntimeEdgeTlsFingerprintRow {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub(super) scope: Option<String>,
+    pub(super) ja3: String,
+    pub(super) ja3_raw: String,
+    pub(super) ja4: String,
+    pub(super) ja4_raw: String,
+    pub(super) total: u64,
+    pub(super) auth_success: u64,
+    pub(super) bad_or_probe: u64,
+    pub(super) first_seen_epoch_secs: u64,
+    pub(super) last_seen_epoch_secs: u64,
+}
+
+#[derive(Serialize)]
+pub(super) struct RuntimeEdgeTlsFingerprintsPayload {
+    pub(super) limit: usize,
+    pub(super) retention_secs: u64,
+    pub(super) capacity: usize,
+    pub(super) dropped_total: u64,
+    pub(super) parse_error_total: u64,
+    pub(super) by_fingerprint: Vec<RuntimeEdgeTlsFingerprintRow>,
+    pub(super) by_ip: Vec<RuntimeEdgeTlsFingerprintRow>,
+    pub(super) by_cidr: Vec<RuntimeEdgeTlsFingerprintRow>,
+    pub(super) by_user: Vec<RuntimeEdgeTlsFingerprintRow>,
+}
+
+#[derive(Serialize)]
+pub(super) struct RuntimeEdgeTlsFingerprintsData {
+    pub(super) enabled: bool,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub(super) reason: Option<&'static str>,
+    pub(super) generated_at_epoch_secs: u64,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub(super) data: Option<RuntimeEdgeTlsFingerprintsPayload>,
+}
+
 pub(super) async fn build_runtime_connections_summary_data(
    shared: &ApiShared,
    cfg: &ProxyConfig,
@@ -162,6 +202,65 @@ pub(super) fn build_runtime_events_recent_data(
    }
 }

+pub(super) fn build_runtime_tls_fingerprints_data(
+    shared: &ApiShared,
+    cfg: &ProxyConfig,
+    query: Option<&str>,
+) -> RuntimeEdgeTlsFingerprintsData {
+    let now_epoch_secs = now_epoch_secs();
+    let api_cfg = &cfg.server.api;
+    if !api_cfg.runtime_edge_enabled {
+        return RuntimeEdgeTlsFingerprintsData {
+            enabled: false,
+            reason: Some(FEATURE_DISABLED_REASON),
+            generated_at_epoch_secs: now_epoch_secs,
+            data: None,
+        };
+    }
+
+    let limit = parse_recent_events_limit(
+        query,
+        api_cfg.runtime_edge_top_n.max(1),
+        TLS_FINGERPRINTS_MAX_LIMIT,
+    );
+    let snapshot = shared
+        .stats
+        .tls_fingerprint_snapshot(runtime_edge_retention(cfg), limit);
+
+    RuntimeEdgeTlsFingerprintsData {
+        enabled: true,
+        reason: None,
+        generated_at_epoch_secs: now_epoch_secs,
+        data: Some(RuntimeEdgeTlsFingerprintsPayload {
+            limit,
+            retention_secs: snapshot.retention_secs,
+            capacity: snapshot.capacity,
+            dropped_total: snapshot.dropped_total,
+            parse_error_total: snapshot.parse_error_total,
+            by_fingerprint: snapshot
+                .by_fingerprint
+                .into_iter()
+                .map(runtime_tls_fingerprint_row)
+                .collect(),
+            by_ip: snapshot
+                .by_ip
+                .into_iter()
+                .map(runtime_tls_fingerprint_row)
+                .collect(),
+            by_cidr: snapshot
+                .by_cidr
+                .into_iter()
+                .map(runtime_tls_fingerprint_row)
+                .collect(),
+            by_user: snapshot
+                .by_user
+                .into_iter()
+                .map(runtime_tls_fingerprint_row)
+                .collect(),
+        }),
+    }
+}
+
 async fn get_connections_payload_cached(
    shared: &ApiShared,
    cache_ttl_ms: u64,
@@ -286,6 +385,35 @@ fn parse_recent_events_limit(query: Option<&str>, default_limit: usize, max_limi
    default_limit
 }

+fn runtime_edge_retention(cfg: &ProxyConfig) -> Duration {
+    let minutes = cfg
+        .general
+        .beobachten_minutes
+        .clamp(1, RUNTIME_EDGE_RETENTION_MAX_MINUTES);
+    Duration::from_secs(minutes.saturating_mul(60))
+}
+
+fn runtime_tls_fingerprint_row(
+    row: crate::stats::TlsFingerprintSnapshotRow,
+) -> RuntimeEdgeTlsFingerprintRow {
+    RuntimeEdgeTlsFingerprintRow {
+        scope: if row.scope_key.is_empty() {
+            None
+        } else {
+            Some(row.scope_key)
+        },
+        ja3: row.ja3,
+        ja3_raw: row.ja3_raw,
+        ja4: row.ja4,
+        ja4_raw: row.ja4_raw,
+        total: row.total,
+        auth_success: row.auth_success,
+        bad_or_probe: row.bad_or_probe,
+        first_seen_epoch_secs: row.first_seen_epoch_secs,
+        last_seen_epoch_secs: row.last_seen_epoch_secs,
+    }
+}
+
 fn now_epoch_secs() -> u64 {
    SystemTime::now()
        .duration_since(UNIX_EPOCH)
@@ -178,6 +178,7 @@ pub(super) async fn build_runtime_gates_data(
    cfg: &ProxyConfig,
 ) -> RuntimeGatesData {
    let startup_summary = build_runtime_startup_summary(shared).await;
+    let startup_snapshot = shared.startup_tracker.snapshot().await;
    let route_state = shared.route_runtime.snapshot();
    let route_mode = route_state.mode.as_str();
    let fast_fallback_enabled =
@@ -191,7 +192,9 @@ pub(super) async fn build_runtime_gates_data(
        None
    };
    let reroute_reason = if reroute_active {
-        if fast_fallback_enabled {
+        if startup_snapshot.me.status.as_str() != "ready" {
+            Some("startup_direct_fallback")
+        } else if fast_fallback_enabled {
            Some("fast_not_ready_fallback")
        } else {
            Some("strict_grace_fallback")
@@ -3,6 +3,7 @@ use std::net::IpAddr;
 use hyper::StatusCode;

 use crate::config::ProxyConfig;
+use crate::config::RateLimitBps;
 use crate::ip_tracker::UserIpTracker;
 use crate::stats::Stats;

@@ -13,8 +14,9 @@ use super::config_store::{
 };
 use super::model::{
    ApiFailure, CreateUserRequest, CreateUserResponse, PatchUserRequest, RotateSecretRequest,
-    TlsDomainLink, UserInfo, UserLinks, is_valid_ad_tag, is_valid_user_secret, is_valid_username,
-    parse_optional_expiration, parse_patch_expiration, random_user_secret,
+    TlsDomainLink, UserInfo, UserLinks, UserQuotaEntry, UserQuotaListData, is_valid_ad_tag,
+    is_valid_user_secret, is_valid_username, parse_optional_expiration, parse_patch_expiration,
+    random_user_secret,
 };
 use super::patch::Patch;

@@ -27,7 +29,10 @@ pub(super) async fn create_user(
    let touches_user_max_tcp_conns = body.max_tcp_conns.is_some();
    let touches_user_expirations = body.expiration_rfc3339.is_some();
    let touches_user_data_quota = body.data_quota_bytes.is_some();
+    let touches_user_rate_limits =
+        body.rate_limit_up_bps.is_some() || body.rate_limit_down_bps.is_some();
    let touches_user_max_unique_ips = body.max_unique_ips.is_some();
+    let touches_user_enabled = matches!(body.enabled, Some(false));

    if !is_valid_username(&body.username) {
        return Err(ApiFailure::bad_request(
@@ -91,6 +96,15 @@ pub(super) async fn create_user(
            .user_data_quota
            .insert(body.username.clone(), quota);
    }
+    if touches_user_rate_limits {
+        cfg.access.user_rate_limits.insert(
+            body.username.clone(),
+            RateLimitBps {
+                up_bps: body.rate_limit_up_bps.unwrap_or(0),
+                down_bps: body.rate_limit_down_bps.unwrap_or(0),
+            },
+        );
+    }

    let updated_limit = body.max_unique_ips;
    if let Some(limit) = updated_limit {
@@ -98,6 +112,9 @@ pub(super) async fn create_user(
            .user_max_unique_ips
            .insert(body.username.clone(), limit);
    }
+    if matches!(body.enabled, Some(false)) {
+        cfg.access.user_enabled.insert(body.username.clone(), false);
+    }

    cfg.validate()
        .map_err(|e| ApiFailure::bad_request(format!("config validation failed: {}", e)))?;
@@ -115,9 +132,15 @@ pub(super) async fn create_user(
    if touches_user_data_quota {
        touched_sections.push(AccessSection::UserDataQuota);
    }
+    if touches_user_rate_limits {
+        touched_sections.push(AccessSection::UserRateLimits);
+    }
    if touches_user_max_unique_ips {
        touched_sections.push(AccessSection::UserMaxUniqueIps);
    }
+    if touches_user_enabled {
+        touched_sections.push(AccessSection::UserEnabled);
+    }

    let revision =
        save_access_sections_to_disk(&shared.config_path, &cfg, &touched_sections).await?;
@@ -145,6 +168,7 @@ pub(super) async fn create_user(
        .find(|entry| entry.username == body.username)
        .unwrap_or(UserInfo {
            username: body.username.clone(),
+            enabled: cfg.access.is_user_enabled(&body.username),
            in_runtime: false,
            user_ad_tag: None,
            max_tcp_conns: cfg
@@ -157,6 +181,8 @@ pub(super) async fn create_user(
                    .then_some(cfg.access.user_max_tcp_conns_global_each)),
            expiration_rfc3339: None,
            data_quota_bytes: None,
+            rate_limit_up_bps: body.rate_limit_up_bps.filter(|limit| *limit > 0),
+            rate_limit_down_bps: body.rate_limit_down_bps.filter(|limit| *limit > 0),
            max_unique_ips: updated_limit,
            current_connections: 0,
            active_unique_ips: 0,
@@ -181,7 +207,10 @@ pub(super) async fn patch_user(
    let touches_user_max_tcp_conns = !matches!(&body.max_tcp_conns, Patch::Unchanged);
    let touches_user_expirations = !matches!(&body.expiration_rfc3339, Patch::Unchanged);
    let touches_user_data_quota = !matches!(&body.data_quota_bytes, Patch::Unchanged);
+    let touches_user_rate_limits = !matches!(&body.rate_limit_up_bps, Patch::Unchanged)
+        || !matches!(&body.rate_limit_down_bps, Patch::Unchanged);
    let touches_user_max_unique_ips = !matches!(&body.max_unique_ips, Patch::Unchanged);
+    let touches_user_enabled = !matches!(&body.enabled, Patch::Unchanged);

    if let Some(secret) = body.secret.as_ref()
        && !is_valid_user_secret(secret)
@@ -253,6 +282,31 @@ pub(super) async fn patch_user(
            cfg.access.user_data_quota.insert(user.to_string(), quota);
        }
    }
+    if touches_user_rate_limits {
+        let mut rate_limit = cfg
+            .access
+            .user_rate_limits
+            .get(user)
+            .copied()
+            .unwrap_or_default();
+        match body.rate_limit_up_bps {
+            Patch::Unchanged => {}
+            Patch::Remove => rate_limit.up_bps = 0,
+            Patch::Set(limit) => rate_limit.up_bps = limit,
+        }
+        match body.rate_limit_down_bps {
+            Patch::Unchanged => {}
+            Patch::Remove => rate_limit.down_bps = 0,
+            Patch::Set(limit) => rate_limit.down_bps = limit,
+        }
+        if rate_limit.up_bps == 0 && rate_limit.down_bps == 0 {
+            cfg.access.user_rate_limits.remove(user);
+        } else {
+            cfg.access
+                .user_rate_limits
+                .insert(user.to_string(), rate_limit);
+        }
+    }
    // Capture how the per-user IP limit changed, so the in-memory ip_tracker
    // can be synced (set or removed) after the config is persisted.
    let max_unique_ips_change = match body.max_unique_ips {
@@ -268,6 +322,15 @@ pub(super) async fn patch_user(
            Some(Some(limit))
        }
    };
+    match body.enabled {
+        Patch::Unchanged => {}
+        Patch::Remove | Patch::Set(true) => {
+            cfg.access.user_enabled.remove(user);
+        }
+        Patch::Set(false) => {
+            cfg.access.user_enabled.insert(user.to_string(), false);
+        }
+    }

    cfg.validate()
        .map_err(|e| ApiFailure::bad_request(format!("config validation failed: {}", e)))?;
@@ -288,9 +351,15 @@ pub(super) async fn patch_user(
    if touches_user_data_quota {
        touched_sections.push(AccessSection::UserDataQuota);
    }
+    if touches_user_rate_limits {
+        touched_sections.push(AccessSection::UserRateLimits);
+    }
    if touches_user_max_unique_ips {
        touched_sections.push(AccessSection::UserMaxUniqueIps);
    }
+    if touches_user_enabled {
+        touched_sections.push(AccessSection::UserEnabled);
+    }

    let revision = if touched_sections.is_empty() {
        current_revision(&shared.config_path).await?
@@ -351,10 +420,12 @@ pub(super) async fn rotate_secret(
        .map_err(|e| ApiFailure::bad_request(format!("config validation failed: {}", e)))?;
    let touched_sections = [
        AccessSection::Users,
+        AccessSection::UserEnabled,
        AccessSection::UserAdTags,
        AccessSection::UserMaxTcpConns,
        AccessSection::UserExpirations,
        AccessSection::UserDataQuota,
+        AccessSection::UserRateLimits,
        AccessSection::UserMaxUniqueIps,
    ];
    let revision =
@@ -385,6 +456,55 @@ pub(super) async fn rotate_secret(
    ))
 }

+pub(super) async fn set_user_enabled(
+    user: &str,
+    enabled: bool,
+    expected_revision: Option<String>,
+    shared: &ApiShared,
+) -> Result<(UserInfo, String), ApiFailure> {
+    let _guard = shared.mutation_lock.lock().await;
+    let mut cfg = load_config_from_disk(&shared.config_path).await?;
+    ensure_expected_revision(&shared.config_path, expected_revision.as_deref()).await?;
+
+    if !cfg.access.users.contains_key(user) {
+        return Err(ApiFailure::new(
+            StatusCode::NOT_FOUND,
+            "not_found",
+            "User not found",
+        ));
+    }
+
+    if enabled {
+        cfg.access.user_enabled.remove(user);
+    } else {
+        cfg.access.user_enabled.insert(user.to_string(), false);
+    }
+
+    cfg.validate()
+        .map_err(|e| ApiFailure::bad_request(format!("config validation failed: {}", e)))?;
+    let revision =
+        save_access_sections_to_disk(&shared.config_path, &cfg, &[AccessSection::UserEnabled])
+            .await?;
+    drop(_guard);
+
+    let (detected_ip_v4, detected_ip_v6) = shared.detected_link_ips();
+    let users = users_from_config(
+        &cfg,
+        &shared.stats,
+        &shared.ip_tracker,
+        detected_ip_v4,
+        detected_ip_v6,
+        None,
+    )
+    .await;
+    let user_info = users
+        .into_iter()
+        .find(|entry| entry.username == user)
+        .ok_or_else(|| ApiFailure::internal("failed to build updated user view"))?;
+
+    Ok((user_info, revision))
+}
+
 pub(super) async fn delete_user(
    user: &str,
    expected_revision: Option<String>,
@@ -410,20 +530,24 @@ pub(super) async fn delete_user(
    }

    cfg.access.users.remove(user);
+    cfg.access.user_enabled.remove(user);
    cfg.access.user_ad_tags.remove(user);
    cfg.access.user_max_tcp_conns.remove(user);
    cfg.access.user_expirations.remove(user);
    cfg.access.user_data_quota.remove(user);
+    cfg.access.user_rate_limits.remove(user);
    cfg.access.user_max_unique_ips.remove(user);

    cfg.validate()
        .map_err(|e| ApiFailure::bad_request(format!("config validation failed: {}", e)))?;
    let touched_sections = [
        AccessSection::Users,
+        AccessSection::UserEnabled,
        AccessSection::UserAdTags,
        AccessSection::UserMaxTcpConns,
        AccessSection::UserExpirations,
        AccessSection::UserDataQuota,
+        AccessSection::UserRateLimits,
        AccessSection::UserMaxUniqueIps,
    ];
    let revision =
@@ -467,6 +591,7 @@ pub(super) async fn users_from_config(
            })
            .unwrap_or_else(empty_user_links);
        users.push(UserInfo {
+            enabled: cfg.access.is_user_enabled(&username),
            in_runtime: runtime_cfg
                .map(|runtime| runtime.access.users.contains_key(&username))
                .unwrap_or(false),
@@ -485,6 +610,18 @@ pub(super) async fn users_from_config(
                .get(&username)
                .map(chrono::DateTime::<chrono::Utc>::to_rfc3339),
            data_quota_bytes: cfg.access.user_data_quota.get(&username).copied(),
+            rate_limit_up_bps: cfg
+                .access
+                .user_rate_limits
+                .get(&username)
+                .map(|limit| limit.up_bps)
+                .filter(|limit| *limit > 0),
+            rate_limit_down_bps: cfg
+                .access
+                .user_rate_limits
+                .get(&username)
+                .map(|limit| limit.down_bps)
+                .filter(|limit| *limit > 0),
            max_unique_ips: cfg
                .access
                .user_max_unique_ips
@@ -506,6 +643,33 @@ pub(super) async fn users_from_config(
    users
 }

+pub(super) fn build_user_quota_list(cfg: &ProxyConfig, stats: &Stats) -> UserQuotaListData {
+    let mut names = cfg.access.users.keys().cloned().collect::<Vec<_>>();
+    names.sort();
+
+    let snapshot = stats.user_quota_snapshot();
+    let mut users = Vec::with_capacity(names.len());
+    for username in names {
+        let Some(&data_quota_bytes) = cfg.access.user_data_quota.get(&username) else {
+            continue;
+        };
+        if data_quota_bytes == 0 {
+            continue;
+        }
+        let (used_bytes, last_reset_epoch_secs) = snapshot
+            .get(&username)
+            .map(|entry| (entry.used_bytes, entry.last_reset_epoch_secs))
+            .unwrap_or((0, 0));
+        users.push(UserQuotaEntry {
+            username,
+            data_quota_bytes,
+            used_bytes,
+            last_reset_epoch_secs,
+        });
+    }
+    UserQuotaListData { users }
+}
+
 fn empty_user_links() -> UserLinks {
    UserLinks {
        classic: Vec::new(),
@@ -758,6 +922,71 @@ mod tests {
        assert_eq!(alice.max_tcp_conns, None);
    }

+    #[tokio::test]
+    async fn users_from_config_reports_user_rate_limits() {
+        let mut cfg = ProxyConfig::default();
+        cfg.access.users.insert(
+            "alice".to_string(),
+            "0123456789abcdef0123456789abcdef".to_string(),
+        );
+        cfg.access.user_rate_limits.insert(
+            "alice".to_string(),
+            RateLimitBps {
+                up_bps: 1024,
+                down_bps: 0,
+            },
+        );
+
+        let stats = Stats::new();
+        let tracker = UserIpTracker::new();
+
+        let users = users_from_config(&cfg, &stats, &tracker, None, None, None).await;
+        let alice = users
+            .iter()
+            .find(|entry| entry.username == "alice")
+            .expect("alice must be present");
+
+        assert_eq!(alice.rate_limit_up_bps, Some(1024));
+        assert_eq!(alice.rate_limit_down_bps, None);
+    }
+
+    #[tokio::test]
+    async fn users_from_config_reports_user_enabled_default_and_override() {
+        let mut cfg = ProxyConfig::default();
+        cfg.access.users.insert(
+            "alice".to_string(),
+            "0123456789abcdef0123456789abcdef".to_string(),
+        );
+        cfg.access.users.insert(
+            "bob".to_string(),
+            "fedcba9876543210fedcba9876543210".to_string(),
+        );
+        cfg.access.user_enabled.insert("bob".to_string(), false);
+
+        let stats = Stats::new();
+        let tracker = UserIpTracker::new();
+        let users = users_from_config(&cfg, &stats, &tracker, None, None, None).await;
+        let alice = users
+            .iter()
+            .find(|entry| entry.username == "alice")
+            .expect("alice must be present");
+        let bob = users
+            .iter()
+            .find(|entry| entry.username == "bob")
+            .expect("bob must be present");
+
+        assert!(alice.enabled);
+        assert!(!bob.enabled);
+
+        cfg.access.user_enabled.insert("bob".to_string(), true);
+        let users = users_from_config(&cfg, &stats, &tracker, None, None, None).await;
+        let bob = users
+            .iter()
+            .find(|entry| entry.username == "bob")
+            .expect("bob must be present");
+        assert!(bob.enabled);
+    }
+
    #[tokio::test]
    async fn users_from_config_marks_runtime_membership_when_snapshot_is_provided() {
        let mut disk_cfg = ProxyConfig::default();
@@ -869,4 +1098,68 @@ mod tests {
                .any(|entry| entry.domain == "front-a.example.com")
        );
    }
+
+    #[test]
+    fn build_user_quota_list_skips_users_without_positive_quota_and_sorts_by_username() {
+        let mut cfg = ProxyConfig::default();
+        cfg.access.users.insert(
+            "alice".to_string(),
+            "0123456789abcdef0123456789abcdef".to_string(),
+        );
+        cfg.access.users.insert(
+            "bob".to_string(),
+            "fedcba9876543210fedcba9876543210".to_string(),
+        );
+        cfg.access.users.insert(
+            "carol".to_string(),
+            "aaaabbbbccccddddeeeeffff00001111".to_string(),
+        );
+        // alice has a positive quota and should be listed.
+        cfg.access
+            .user_data_quota
+            .insert("alice".to_string(), 1 << 20);
+        // bob has no quota entry at all (None) — should be skipped.
+        // carol has an explicit zero quota — should be skipped.
+        cfg.access.user_data_quota.insert("carol".to_string(), 0);
+
+        let stats = Stats::new();
+        // Charge some traffic against alice; carol gets traffic too but should
+        // still be filtered out by the quota check.
+        let alice_stats = stats.get_or_create_user_stats_handle("alice");
+        stats.quota_charge_post_write(&alice_stats, 4096);
+        let carol_stats = stats.get_or_create_user_stats_handle("carol");
+        stats.quota_charge_post_write(&carol_stats, 99);
+
+        let data = build_user_quota_list(&cfg, &stats);
+
+        assert_eq!(data.users.len(), 1);
+        let entry = &data.users[0];
+        assert_eq!(entry.username, "alice");
+        assert_eq!(entry.data_quota_bytes, 1 << 20);
+        assert_eq!(entry.used_bytes, 4096);
+        assert_eq!(entry.last_reset_epoch_secs, 0);
+    }
+
+    #[test]
+    fn build_user_quota_list_orders_multiple_users_by_username_ascending() {
+        let mut cfg = ProxyConfig::default();
+        for name in ["charlie", "alice", "bob"] {
+            cfg.access.users.insert(
+                name.to_string(),
+                "0123456789abcdef0123456789abcdef".to_string(),
+            );
+            cfg.access.user_data_quota.insert(name.to_string(), 1 << 30);
+        }
+
+        let stats = Stats::new();
+        let data = build_user_quota_list(&cfg, &stats);
+
+        let names: Vec<&str> = data.users.iter().map(|e| e.username.as_str()).collect();
+        assert_eq!(names, vec!["alice", "bob", "charlie"]);
+        for entry in &data.users {
+            assert_eq!(entry.used_bytes, 0);
+            assert_eq!(entry.last_reset_epoch_secs, 0);
+            assert_eq!(entry.data_quota_bytes, 1 << 30);
+        }
+    }
 }
@@ -705,6 +705,9 @@ ignore_time_skew = false
 type = "direct"
 enabled = true
 weight = 10
+# Optional per-upstream DC family policy:
+# ipv6 = true
+# prefer = 6
 "#,
        username = username,
        secret = secret,
@@ -118,6 +118,7 @@ pub struct HotFields {
    pub me_admission_poll_ms: u64,
    pub me_warn_rate_limit_ms: u64,
    pub users: std::collections::HashMap<String, String>,
+    pub user_enabled: std::collections::HashMap<String, bool>,
    pub user_ad_tags: std::collections::HashMap<String, String>,
    pub user_max_tcp_conns: std::collections::HashMap<String, usize>,
    pub user_max_tcp_conns_global_each: usize,
@@ -247,6 +248,7 @@ impl HotFields {
            me_admission_poll_ms: cfg.general.me_admission_poll_ms,
            me_warn_rate_limit_ms: cfg.general.me_warn_rate_limit_ms,
            users: cfg.access.users.clone(),
+            user_enabled: cfg.access.user_enabled.clone(),
            user_ad_tags: cfg.access.user_ad_tags.clone(),
            user_max_tcp_conns: cfg.access.user_max_tcp_conns.clone(),
            user_max_tcp_conns_global_each: cfg.access.user_max_tcp_conns_global_each,
@@ -310,6 +312,7 @@ fn listeners_equal(
    lhs.iter().zip(rhs.iter()).all(|(a, b)| {
        a.ip == b.ip
            && a.port == b.port
+            && a.client_mss == b.client_mss
            && a.announce == b.announce
            && a.announce_ip == b.announce_ip
            && a.proxy_protocol == b.proxy_protocol
@@ -551,6 +554,7 @@ fn overlay_hot_fields(old: &ProxyConfig, new: &ProxyConfig) -> ProxyConfig {
    cfg.general.me_warn_rate_limit_ms = new.general.me_warn_rate_limit_ms;

    cfg.access.users = new.access.users.clone();
+    cfg.access.user_enabled = new.access.user_enabled.clone();
    cfg.access.user_ad_tags = new.access.user_ad_tags.clone();
    cfg.access.user_max_tcp_conns = new.access.user_max_tcp_conns.clone();
    cfg.access.user_max_tcp_conns_global_each = new.access.user_max_tcp_conns_global_each;
@@ -605,6 +609,7 @@ fn warn_non_hot_changes(old: &ProxyConfig, new: &ProxyConfig, non_hot_changed: b
        || old.server.listen_addr_ipv4 != new.server.listen_addr_ipv4
        || old.server.listen_addr_ipv6 != new.server.listen_addr_ipv6
        || old.server.listen_tcp != new.server.listen_tcp
+        || old.server.client_mss != new.server.client_mss
        || old.server.listen_unix_sock != new.server.listen_unix_sock
        || old.server.listen_unix_sock_perm != new.server.listen_unix_sock_perm
    {
@@ -617,6 +622,7 @@ fn warn_non_hot_changes(old: &ProxyConfig, new: &ProxyConfig, non_hot_changed: b
        || old.censorship.mask != new.censorship.mask
        || old.censorship.mask_host != new.censorship.mask_host
        || old.censorship.mask_port != new.censorship.mask_port
+        || old.censorship.exclusive_mask != new.censorship.exclusive_mask
        || old.censorship.mask_unix_sock != new.censorship.mask_unix_sock
        || old.censorship.fake_cert_len != new.censorship.fake_cert_len
        || old.censorship.tls_emulation != new.censorship.tls_emulation
@@ -1177,6 +1183,16 @@ fn log_changes(
        }
    }

+    if old_hot.user_enabled != new_hot.user_enabled {
+        info!(
+            "config reload: user_enabled updated ({} disabled overrides)",
+            new_hot
+                .user_enabled
+                .values()
+                .filter(|enabled| !**enabled)
+                .count()
+        );
+    }
    if old_hot.user_max_tcp_conns != new_hot.user_max_tcp_conns {
        info!(
            "config reload: user_max_tcp_conns updated ({} entries)",
@@ -31,6 +31,87 @@ fn is_valid_tls_domain_name(domain: &str) -> bool {
            .any(|ch| ch.is_whitespace() || matches!(ch, '/' | '\\'))
 }

+fn normalize_domain_to_ascii(domain: &str, field: &str) -> Result<String> {
+    let domain = domain.trim();
+    if !is_valid_tls_domain_name(domain) {
+        return Err(ProxyError::Config(format!(
+            "Invalid {field}: '{}'. Must be a valid domain name",
+            domain
+        )));
+    }
+
+    let parsed = url::Url::parse(&format!("https://{domain}/")).map_err(|error| {
+        ProxyError::Config(format!(
+            "Invalid {field}: '{}'. IDNA conversion failed: {error}",
+            domain
+        ))
+    })?;
+    let host = parsed.host_str().ok_or_else(|| {
+        ProxyError::Config(format!("Invalid {field}: '{}'. Host is empty", domain))
+    })?;
+    Ok(host.to_ascii_lowercase())
+}
+
+fn normalize_mask_host_to_ascii(host: &str, field: &str) -> Result<String> {
+    let host = host.trim();
+    if host.starts_with('[') && host.ends_with(']') {
+        let inner = &host[1..host.len() - 1];
+        let ip = inner.parse::<std::net::IpAddr>().map_err(|_| {
+            ProxyError::Config(format!(
+                "Invalid {field}: '{}'. IPv6 literal is invalid",
+                host
+            ))
+        })?;
+        return match ip {
+            std::net::IpAddr::V6(v6) => Ok(format!("[{v6}]")),
+            std::net::IpAddr::V4(v4) => Ok(v4.to_string()),
+        };
+    }
+    if let Ok(ip) = host.parse::<std::net::IpAddr>() {
+        return match ip {
+            std::net::IpAddr::V4(v4) => Ok(v4.to_string()),
+            std::net::IpAddr::V6(v6) => Ok(format!("[{v6}]")),
+        };
+    }
+
+    normalize_domain_to_ascii(host, field)
+}
+
+fn parse_exclusive_mask_target(target: &str) -> Option<(&str, u16)> {
+    let target = target.trim();
+    if target.is_empty() {
+        return None;
+    }
+
+    if target.starts_with('[') {
+        let end = target.find(']')?;
+        if target.get(end + 1..end + 2)? != ":" {
+            return None;
+        }
+        let host = &target[..=end];
+        let port = target[end + 2..].parse::<u16>().ok()?;
+        return (port > 0).then_some((host, port));
+    }
+
+    let (host, port) = target.rsplit_once(':')?;
+    if host.is_empty() || host.contains(':') {
+        return None;
+    }
+    let port = port.parse::<u16>().ok()?;
+    (port > 0).then_some((host, port))
+}
+
+fn normalize_exclusive_mask_target(target: &str, field: &str) -> Result<String> {
+    let (host, port) = parse_exclusive_mask_target(target).ok_or_else(|| {
+        ProxyError::Config(format!(
+            "Invalid {field}: '{}'. Expected host:port with port > 0",
+            target
+        ))
+    })?;
+    let host = normalize_mask_host_to_ascii(host, field)?;
+    Ok(format!("{host}:{port}"))
+}
+
 const TOP_LEVEL_CONFIG_KEYS: &[&str] = &[
    "general",
    "network",
@@ -218,6 +299,7 @@ const SERVER_CONFIG_KEYS: &[&str] = &[
    "listen_unix_sock",
    "listen_unix_sock_perm",
    "listen_tcp",
+    "client_mss",
    "proxy_protocol",
    "proxy_protocol_header_timeout_ms",
    "proxy_protocol_trusted_cidrs",
@@ -263,6 +345,7 @@ const CONNTRACK_CONTROL_CONFIG_KEYS: &[&str] = &[
 const LISTENER_CONFIG_KEYS: &[&str] = &[
    "ip",
    "port",
+    "client_mss",
    "announce",
    "announce_ip",
    "proxy_protocol",
@@ -291,6 +374,7 @@ const CENSORSHIP_CONFIG_KEYS: &[&str] = &[
    "mask",
    "mask_host",
    "mask_port",
+    "exclusive_mask",
    "mask_unix_sock",
    "fake_cert_len",
    "tls_emulation",
@@ -329,6 +413,7 @@ const TLS_FETCH_CONFIG_KEYS: &[&str] = &[

 const ACCESS_CONFIG_KEYS: &[&str] = &[
    "users",
+    "user_enabled",
    "user_ad_tags",
    "user_max_tcp_conns",
    "user_max_tcp_conns_global_each",
@@ -924,6 +1009,14 @@ fn validate_upstreams(config: &ProxyConfig) -> Result<()> {
                "upstream.ipv4 and upstream.ipv6 cannot both be false".to_string(),
            ));
        }
+        if let Some(prefer) = upstream.prefer
+            && prefer != 4
+            && prefer != 6
+        {
+            return Err(ProxyError::Config(
+                "upstream.prefer must be 4 or 6".to_string(),
+            ));
+        }

        if let UpstreamType::Shadowsocks { url, .. } = &upstream.upstream_type {
            let parsed = ShadowsocksServerConfig::from_url(url)
@@ -939,6 +1032,26 @@ fn validate_upstreams(config: &ProxyConfig) -> Result<()> {
    Ok(())
 }

+fn normalize_upstream_family_policy(config: &mut ProxyConfig) {
+    for (idx, upstream) in config.upstreams.iter_mut().enumerate() {
+        if matches!(upstream.ipv4, Some(false)) && upstream.prefer == Some(4) {
+            warn!(
+                upstream = idx,
+                "upstream.prefer=4 but upstream.ipv4=false; forcing prefer=6"
+            );
+            upstream.prefer = Some(6);
+        }
+
+        if matches!(upstream.ipv6, Some(false)) && upstream.prefer == Some(6) {
+            warn!(
+                upstream = idx,
+                "upstream.prefer=6 but upstream.ipv6=false; forcing prefer=4"
+            );
+            upstream.prefer = Some(4);
+        }
+    }
+}
+
 // ============= Main Config =============

 #[derive(Debug, Clone, Serialize, Deserialize, Default)]
@@ -1822,6 +1935,20 @@ impl ProxyConfig {
            ));
        }

+        config
+            .server
+            .client_mss_value()
+            .map_err(|error| ProxyError::Config(format!("server.client_mss {error}")))?;
+        for (idx, listener) in config.server.listeners.iter().enumerate() {
+            if listener.client_mss.is_some() {
+                listener
+                    .effective_client_mss(&config.server)
+                    .map_err(|error| {
+                        ProxyError::Config(format!("server.listeners[{idx}].client_mss {error}"))
+                    })?;
+            }
+        }
+
        if config.server.accept_permit_timeout_ms > 60_000 {
            return Err(ProxyError::Config(
                "server.accept_permit_timeout_ms must be within [0, 60000]".to_string(),
@@ -1887,10 +2014,8 @@ impl ProxyConfig {
            }
        }

-        // Validate tls_domain.
-        if config.censorship.tls_domain.is_empty() {
-            return Err(ProxyError::Config("tls_domain cannot be empty".to_string()));
-        }
+        config.censorship.tls_domain =
+            normalize_domain_to_ascii(&config.censorship.tls_domain, "censorship.tls_domain")?;

        // Validate mask_unix_sock.
        if let Some(ref sock_path) = config.censorship.mask_unix_sock {
@@ -1918,11 +2043,30 @@ impl ProxyConfig {
            }
        }

+        if let Some(mask_host) = config.censorship.mask_host.as_mut() {
+            *mask_host = normalize_mask_host_to_ascii(mask_host, "censorship.mask_host")?;
+        }
+
        // Default mask_host to tls_domain if not set and no unix socket configured.
        if config.censorship.mask_host.is_none() && config.censorship.mask_unix_sock.is_none() {
            config.censorship.mask_host = Some(config.censorship.tls_domain.clone());
        }

+        for (domain, target) in &config.censorship.exclusive_mask {
+            if !is_valid_tls_domain_name(domain) {
+                return Err(ProxyError::Config(format!(
+                    "Invalid censorship.exclusive_mask domain: '{}'. Must be a valid domain name",
+                    domain
+                )));
+            }
+            if parse_exclusive_mask_target(target).is_none() {
+                return Err(ProxyError::Config(format!(
+                    "Invalid censorship.exclusive_mask target for '{}': '{}'. Expected host:port with port > 0",
+                    domain, target
+                )));
+            }
+        }
+
        // Normalize optional TLS fetch scope: whitespace-only values disable scoped routing.
        config.censorship.tls_fetch_scope = config.censorship.tls_fetch_scope.trim().to_string();

@@ -1953,8 +2097,11 @@ impl ProxyConfig {
            let mut all = Vec::with_capacity(1 + config.censorship.tls_domains.len());
            all.push(config.censorship.tls_domain.clone());
            for d in std::mem::take(&mut config.censorship.tls_domains) {
-                if !d.is_empty() && !all.contains(&d) {
-                    all.push(d);
+                if !d.is_empty() {
+                    let domain = normalize_domain_to_ascii(&d, "censorship.tls_domains entry")?;
+                    if !all.contains(&domain) {
+                        all.push(domain);
+                    }
                }
            }
            // keep primary as tls_domain; store remaining back to tls_domains
@@ -1963,6 +2110,31 @@ impl ProxyConfig {
            }
        }

+        let mut exclusive_mask = HashMap::with_capacity(config.censorship.exclusive_mask.len());
+        let mut exclusive_mask_targets =
+            HashMap::with_capacity(config.censorship.exclusive_mask.len());
+        for (domain, target) in std::mem::take(&mut config.censorship.exclusive_mask) {
+            let domain = normalize_domain_to_ascii(&domain, "censorship.exclusive_mask domain")?;
+            let target =
+                normalize_exclusive_mask_target(&target, "censorship.exclusive_mask target")?;
+            let Some((host, port)) = parse_exclusive_mask_target(&target) else {
+                return Err(ProxyError::Config(format!(
+                    "Invalid censorship.exclusive_mask target for '{}': '{}'. Expected host:port with port > 0",
+                    domain, target
+                )));
+            };
+            exclusive_mask_targets.insert(
+                domain.clone(),
+                ExclusiveMaskTarget {
+                    host: host.to_string(),
+                    port,
+                },
+            );
+            exclusive_mask.insert(domain, target);
+        }
+        config.censorship.exclusive_mask = exclusive_mask;
+        config.censorship.exclusive_mask_targets = exclusive_mask_targets;
+
        // Migration: prefer_ipv6 -> network.prefer.
        if config.general.prefer_ipv6 {
            if config.network.prefer == 4 {
@@ -2017,6 +2189,7 @@ impl ProxyConfig {
                config.server.listeners.push(ListenerConfig {
                    ip: ipv4,
                    port: Some(config.server.port),
+                    client_mss: None,
                    announce: None,
                    announce_ip: None,
                    proxy_protocol: None,
@@ -2029,6 +2202,7 @@ impl ProxyConfig {
                config.server.listeners.push(ListenerConfig {
                    ip: ipv6,
                    port: Some(config.server.port),
+                    client_mss: None,
                    announce: None,
                    announce_ip: None,
                    proxy_protocol: None,
@@ -2072,8 +2246,10 @@ impl ProxyConfig {
                selected_scope: String::new(),
                ipv4: None,
                ipv6: None,
+                prefer: None,
            });
        }
+        normalize_upstream_family_policy(&mut config);

        // Ensure default DC203 override is present.
        config
@@ -2126,6 +2302,21 @@ impl ProxyConfig {
            }
        }

+        for (domain, target) in &self.censorship.exclusive_mask {
+            if !is_valid_tls_domain_name(domain) {
+                return Err(ProxyError::Config(format!(
+                    "Invalid censorship.exclusive_mask domain: '{}'. Must be a valid domain name",
+                    domain
+                )));
+            }
+            if parse_exclusive_mask_target(target).is_none() {
+                return Err(ProxyError::Config(format!(
+                    "Invalid censorship.exclusive_mask target for '{}': '{}'. Expected host:port with port > 0",
+                    domain, target
+                )));
+            }
+        }
+
        for (user, tag) in &self.access.user_ad_tags {
            let zeros = "00000000000000000000000000000000";
            if !is_valid_ad_tag(tag) {
@@ -2287,6 +2478,7 @@ mod tests {
        assert_eq!(cfg.general.update_every, default_update_every());
        assert_eq!(cfg.server.listen_addr_ipv4, default_listen_addr_ipv4());
        assert_eq!(cfg.server.listen_addr_ipv6, default_listen_addr_ipv6_opt());
+        assert_eq!(cfg.server.client_mss_value(), Ok(None));
        assert_eq!(
            cfg.server.proxy_protocol_trusted_cidrs,
            default_proxy_protocol_trusted_cidrs()
@@ -2667,6 +2859,44 @@ mod tests {
        );
    }

+    #[test]
+    fn exclusive_mask_parses_domain_target_map() {
+        let cfg = load_config_from_temp_toml(
+            r#"
+            [general]
+            [network]
+            [server]
+            [access]
+            [censorship]
+            tls_domain = "weißbiergärten.de"
+            tls_domains = ["bürgeramt.de"]
+            [censorship.exclusive_mask]
+            "bürgeramt.de" = "rindfleischetikettierungsüberwachungsaufgabenübertragungsgesetz.de:443"
+            "ipv6.example" = "[::1]:443"
+            "#,
+        );
+
+        assert!(cfg.censorship.tls_domain.is_ascii());
+        assert!(cfg.censorship.tls_domain.contains("xn--"));
+        assert_eq!(cfg.censorship.tls_domains.len(), 1);
+        let normalized_extra = &cfg.censorship.tls_domains[0];
+        assert!(normalized_extra.is_ascii());
+        assert!(normalized_extra.contains("xn--"));
+
+        let normalized_target = cfg
+            .censorship
+            .exclusive_mask
+            .get(normalized_extra)
+            .expect("exclusive_mask key must match normalized tls_domains entry");
+        assert!(normalized_target.is_ascii());
+        assert!(normalized_target.contains("xn--"));
+        assert!(normalized_target.ends_with(":443"));
+        assert_eq!(
+            cfg.censorship.exclusive_mask.get("ipv6.example"),
+            Some(&"[::1]:443".to_string())
+        );
+    }
+
    #[test]
    fn api_gray_action_parses_and_defaults_to_drop() {
        let cfg_default: ProxyConfig = toml::from_str(
@@ -3576,6 +3806,153 @@ mod tests {
        let _ = std::fs::remove_file(path);
    }

+    #[test]
+    fn client_mss_presets_and_listener_override_are_resolved() {
+        let toml = r#"
+            [server]
+            client_mss = "tspu"
+
+            [[server.listeners]]
+            ip = "127.0.0.1"
+            port = 1443
+
+            [[server.listeners]]
+            ip = "127.0.0.2"
+            port = 1444
+            client_mss = "2in8"
+
+            [[server.listeners]]
+            ip = "127.0.0.3"
+            port = 1445
+            client_mss = ""
+
+            [[server.listeners]]
+            ip = "127.0.0.4"
+            port = 1446
+            client_mss = "extreme-low"
+
+            [censorship]
+            tls_domain = "example.com"
+
+            [access.users]
+            user = "00000000000000000000000000000000"
+        "#;
+        let dir = std::env::temp_dir();
+        let path = dir.join("telemt_client_mss_valid_test.toml");
+        std::fs::write(&path, toml).unwrap();
+        let cfg = ProxyConfig::load(&path).unwrap();
+
+        assert_eq!(cfg.server.client_mss_value(), Ok(Some(92)));
+        assert_eq!(
+            cfg.server.listeners[0].effective_client_mss(&cfg.server),
+            Ok(Some(92))
+        );
+        assert_eq!(
+            cfg.server.listeners[1].effective_client_mss(&cfg.server),
+            Ok(Some(256))
+        );
+        assert_eq!(
+            cfg.server.listeners[2].effective_client_mss(&cfg.server),
+            Ok(None)
+        );
+        assert_eq!(
+            cfg.server.listeners[3].effective_client_mss(&cfg.server),
+            Ok(Some(88))
+        );
+        let _ = std::fs::remove_file(path);
+    }
+
+    #[test]
+    fn client_mss_custom_value_is_accepted() {
+        let toml = r#"
+            [server]
+            client_mss = "4096"
+
+            [censorship]
+            tls_domain = "example.com"
+
+            [access.users]
+            user = "00000000000000000000000000000000"
+        "#;
+        let dir = std::env::temp_dir();
+        let path = dir.join("telemt_client_mss_custom_valid_test.toml");
+        std::fs::write(&path, toml).unwrap();
+        let cfg = ProxyConfig::load(&path).unwrap();
+
+        assert_eq!(cfg.server.client_mss_value(), Ok(Some(4096)));
+        let _ = std::fs::remove_file(path);
+    }
+
+    #[test]
+    fn client_mss_out_of_range_is_rejected() {
+        for value in ["87", "4097"] {
+            let toml = format!(
+                r#"
+                [server]
+                client_mss = "{value}"
+
+                [censorship]
+                tls_domain = "example.com"
+
+                [access.users]
+                user = "00000000000000000000000000000000"
+            "#
+            );
+            let dir = std::env::temp_dir();
+            let path = dir.join(format!("telemt_client_mss_out_of_range_{value}_test.toml"));
+            std::fs::write(&path, toml).unwrap();
+            let err = ProxyConfig::load(&path).unwrap_err().to_string();
+
+            assert!(err.contains("server.client_mss custom value must be within [88, 4096]"));
+            let _ = std::fs::remove_file(path);
+        }
+    }
+
+    #[test]
+    fn client_mss_unquoted_number_is_rejected() {
+        let toml = r#"
+            [server]
+            client_mss = 256
+
+            [censorship]
+            tls_domain = "example.com"
+
+            [access.users]
+            user = "00000000000000000000000000000000"
+        "#;
+        let dir = std::env::temp_dir();
+        let path = dir.join("telemt_client_mss_unquoted_number_test.toml");
+        std::fs::write(&path, toml).unwrap();
+        let err = ProxyConfig::load(&path).unwrap_err().to_string();
+
+        assert!(err.contains("client_mss"));
+        let _ = std::fs::remove_file(path);
+    }
+
+    #[test]
+    fn listener_client_mss_invalid_preset_is_rejected() {
+        let toml = r#"
+            [[server.listeners]]
+            ip = "127.0.0.1"
+            port = 1443
+            client_mss = "tiny"
+
+            [censorship]
+            tls_domain = "example.com"
+
+            [access.users]
+            user = "00000000000000000000000000000000"
+        "#;
+        let dir = std::env::temp_dir();
+        let path = dir.join("telemt_listener_client_mss_invalid_test.toml");
+        std::fs::write(&path, toml).unwrap();
+        let err = ProxyConfig::load(&path).unwrap_err().to_string();
+
+        assert!(err.contains("server.listeners[0].client_mss"));
+        assert!(err.contains("must be \"\", extreme-low, tspu, 2in8"));
+        let _ = std::fs::remove_file(path);
+    }
+
    #[test]
    fn api_runtime_edge_cache_ttl_out_of_range_is_rejected() {
        let toml = r#"
@@ -1,14 +1,21 @@
 use super::*;
 use std::fs;
 use std::path::PathBuf;
+use std::sync::atomic::{AtomicU64, Ordering};
 use std::time::{SystemTime, UNIX_EPOCH};

+static TEMP_CONFIG_COUNTER: AtomicU64 = AtomicU64::new(0);
+
 fn write_temp_config(contents: &str) -> PathBuf {
    let nonce = SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .expect("system time must be after unix epoch")
        .as_nanos();
-    let path = std::env::temp_dir().join(format!("telemt-load-mask-shape-security-{nonce}.toml"));
+    let seq = TEMP_CONFIG_COUNTER.fetch_add(1, Ordering::Relaxed);
+    let pid = std::process::id();
+    let path = std::env::temp_dir().join(format!(
+        "telemt-load-mask-shape-security-{pid}-{seq}-{nonce}.toml"
+    ));
    fs::write(&path, contents).expect("temp config write must succeed");
    path
 }
@@ -21,8 +21,7 @@ pub enum LogLevel {
    #[default]
    Normal,
    /// Minimal output: only warnings and errors (warn + error).
-    /// Startup messages (config, DC connectivity, proxy links) are always shown
-    /// via info! before the filter is applied.
+    /// Proxy links may still be emitted through their dedicated target.
    Silent,
 }

@@ -1452,6 +1451,11 @@ pub struct ServerConfig {
    #[serde(default)]
    pub listen_tcp: Option<bool>,

+    /// Client-facing TCP MSS preset or custom value for all TCP listeners.
+    /// Empty string or omitted value keeps the kernel default.
+    #[serde(default)]
+    pub client_mss: Option<String>,
+
    /// Accept HAProxy PROXY protocol headers on incoming connections.
    /// When enabled, real client IPs are extracted from PROXY v1/v2 headers.
    #[serde(default)]
@@ -1518,6 +1522,7 @@ impl Default for ServerConfig {
            listen_unix_sock: None,
            listen_unix_sock_perm: None,
            listen_tcp: None,
+            client_mss: None,
            proxy_protocol: false,
            proxy_protocol_header_timeout_ms: default_proxy_protocol_header_timeout_ms(),
            proxy_protocol_trusted_cidrs: default_proxy_protocol_trusted_cidrs(),
@@ -1688,6 +1693,14 @@ impl Default for TlsFetchConfig {
    }
 }

+#[derive(Debug, Clone)]
+pub struct ExclusiveMaskTarget {
+    /// Target host after IDNA/IP normalization.
+    pub host: String,
+    /// TCP port for the selected target.
+    pub port: u16,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct AntiCensorshipConfig {
    #[serde(default = "default_tls_domain")]
@@ -1719,6 +1732,14 @@ pub struct AntiCensorshipConfig {
    #[serde(default = "default_mask_port")]
    pub mask_port: u16,

+    /// Per-SNI TCP mask targets. Keys are SNI domains, values are `host:port`.
+    #[serde(default)]
+    pub exclusive_mask: HashMap<String, String>,
+
+    /// Parsed runtime cache for per-SNI TCP mask targets.
+    #[serde(skip)]
+    pub exclusive_mask_targets: HashMap<String, ExclusiveMaskTarget>,
+
    #[serde(default)]
    pub mask_unix_sock: Option<String>,

@@ -1842,6 +1863,8 @@ impl Default for AntiCensorshipConfig {
            mask: default_true(),
            mask_host: None,
            mask_port: default_mask_port(),
+            exclusive_mask: HashMap::new(),
+            exclusive_mask_targets: HashMap::new(),
            mask_unix_sock: None,
            fake_cert_len: default_fake_cert_len(),
            tls_emulation: true,
@@ -1875,6 +1898,9 @@ pub struct AccessConfig {
    #[serde(default = "default_access_users")]
    pub users: HashMap<String, String>,

+    #[serde(default)]
+    pub user_enabled: HashMap<String, bool>,
+
    /// Per-user ad_tag (32 hex chars from @MTProxybot).
    #[serde(default)]
    pub user_ad_tags: HashMap<String, String>,
@@ -1946,6 +1972,7 @@ impl Default for AccessConfig {
    fn default() -> Self {
        Self {
            users: default_access_users(),
+            user_enabled: HashMap::new(),
            user_ad_tags: HashMap::new(),
            user_max_tcp_conns: HashMap::new(),
            user_max_tcp_conns_global_each: default_user_max_tcp_conns_global_each(),
@@ -1966,6 +1993,10 @@ impl Default for AccessConfig {
 }

 impl AccessConfig {
+    pub fn is_user_enabled(&self, username: &str) -> bool {
+        self.user_enabled.get(username).copied().unwrap_or(true)
+    }
+
    /// Returns true if `ip` is contained in any CIDR listed for `username` under `user_source_deny`.
    pub fn is_user_source_ip_denied(&self, username: &str, ip: IpAddr) -> bool {
        self.user_source_deny
@@ -2040,6 +2071,20 @@ pub struct UpstreamConfig {
    /// `None` means auto-detect from runtime connectivity state.
    #[serde(default)]
    pub ipv6: Option<bool>,
+    /// Per-upstream IP family preference for Telegram DC targets.
+    /// `None` inherits the effective global `[network].prefer` decision.
+    #[serde(default)]
+    pub prefer: Option<u8>,
+}
+
+impl UpstreamConfig {
+    pub fn prefer_ipv6(&self, default_prefer_ipv6: bool) -> bool {
+        match self.prefer {
+            Some(6) => true,
+            Some(4) => false,
+            _ => default_prefer_ipv6,
+        }
+    }
 }

 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -2048,6 +2093,10 @@ pub struct ListenerConfig {
    /// Per-listener TCP port. If omitted, falls back to legacy `server.port`.
    #[serde(default)]
    pub port: Option<u16>,
+    /// Per-listener client-facing TCP MSS preset or custom value.
+    /// Empty string disables MSS shaping for this listener.
+    #[serde(default)]
+    pub client_mss: Option<String>,
    /// IP address or hostname to announce in proxy links.
    /// Takes precedence over `announce_ip` if both are set.
    #[serde(default)]
@@ -2065,6 +2114,64 @@ pub struct ListenerConfig {
    pub reuse_allow: bool,
 }

+/// Client-facing TCP MSS preset for extreme-low fragmentation profiles.
+pub const CLIENT_MSS_EXTREME_LOW: u16 = 88;
+/// Client-facing TCP MSS preset matching TSPU-oriented deployments.
+pub const CLIENT_MSS_TSPU: u16 = 92;
+/// Client-facing TCP MSS preset for 2-in-8 segment shaping.
+pub const CLIENT_MSS_2IN8: u16 = 256;
+/// Minimum accepted custom client-facing TCP MSS value.
+pub const CLIENT_MSS_MIN: u16 = CLIENT_MSS_EXTREME_LOW;
+/// Maximum accepted custom client-facing TCP MSS value.
+pub const CLIENT_MSS_MAX: u16 = 4096;
+
+impl ServerConfig {
+    /// Resolves the global client-facing TCP MSS setting.
+    pub fn client_mss_value(&self) -> std::result::Result<Option<u16>, String> {
+        parse_client_mss(self.client_mss.as_deref())
+    }
+}
+
+impl ListenerConfig {
+    /// Resolves the listener MSS override, falling back to the global server value.
+    pub fn effective_client_mss(
+        &self,
+        server: &ServerConfig,
+    ) -> std::result::Result<Option<u16>, String> {
+        match self.client_mss.as_deref() {
+            Some(value) => parse_client_mss(Some(value)),
+            None => server.client_mss_value(),
+        }
+    }
+}
+
+fn parse_client_mss(raw: Option<&str>) -> std::result::Result<Option<u16>, String> {
+    let Some(raw) = raw else {
+        return Ok(None);
+    };
+    let value = raw.trim();
+    if value.is_empty() {
+        return Ok(None);
+    }
+
+    match value.to_ascii_lowercase().as_str() {
+        "extreme-low" => return Ok(Some(CLIENT_MSS_EXTREME_LOW)),
+        "tspu" => return Ok(Some(CLIENT_MSS_TSPU)),
+        "2in8" => return Ok(Some(CLIENT_MSS_2IN8)),
+        _ => {}
+    }
+
+    let parsed = value
+        .parse::<u16>()
+        .map_err(|_| "must be \"\", extreme-low, tspu, 2in8, or a decimal value".to_string())?;
+    if !(CLIENT_MSS_MIN..=CLIENT_MSS_MAX).contains(&parsed) {
+        return Err(format!(
+            "custom value must be within [{CLIENT_MSS_MIN}, {CLIENT_MSS_MAX}]"
+        ));
+    }
+    Ok(Some(parsed))
+}
+
 // ============= ShowLink =============

 /// Controls which users' proxy links are displayed at startup.
@@ -705,7 +705,7 @@ fn nofile_soft_limit() -> Option<u64> {
        if rc != 0 {
            return None;
        }
-        return Some(lim.rlim_cur);
+        return Some(lim.rlim_cur.into());
    }
    #[cfg(not(target_os = "linux"))]
    {
@@ -245,6 +245,9 @@ pub enum ProxyError {
    InvalidSecret { user: String, reason: String },

    // ============= User Errors =============
+    #[error("User {user} disabled")]
+    UserDisabled { user: String },
+
    #[error("User {user} expired")]
    UserExpired { user: String },

@@ -0,0 +1,173 @@
+use super::*;
+
+impl UserIpTracker {
+    pub async fn set_limit_policy(&self, mode: UserMaxUniqueIpsMode, window_secs: u64) {
+        self.limit_mode
+            .store(Self::mode_to_u8(mode), Ordering::Relaxed);
+        self.limit_window_secs
+            .store(window_secs.max(1), Ordering::Relaxed);
+    }
+
+    pub async fn set_user_limit(&self, username: &str, max_ips: usize) {
+        self.max_ips.insert(username.to_string(), max_ips);
+    }
+
+    pub async fn remove_user_limit(&self, username: &str) {
+        self.max_ips.remove(username);
+    }
+
+    pub async fn load_limits(&self, default_limit: usize, limits: &HashMap<String, usize>) {
+        self.default_max_ips.store(default_limit, Ordering::Relaxed);
+        self.max_ips.clear();
+        for (username, limit) in limits {
+            self.max_ips.insert(username.clone(), *limit);
+        }
+    }
+
+    pub(super) fn prune_recent(
+        user_recent: &mut HashMap<IpAddr, Instant>,
+        now: Instant,
+        window: Duration,
+    ) -> usize {
+        if user_recent.is_empty() {
+            return 0;
+        }
+        let before = user_recent.len();
+        user_recent.retain(|_, seen_at| now.duration_since(*seen_at) <= window);
+        before.saturating_sub(user_recent.len())
+    }
+
+    pub async fn check_and_add(&self, username: &str, ip: IpAddr) -> Result<(), String> {
+        self.drain_cleanup_for_user(username).await;
+        self.maybe_compact_empty_users().await;
+        let limit = self.user_limit(username);
+        let mode = Self::mode_from_u8(self.limit_mode.load(Ordering::Relaxed));
+        let window = self.limit_window();
+        let now = Instant::now();
+
+        let shard_idx = Self::shard_idx(username);
+        let mut shard = self.shards[shard_idx].write().await;
+        let user_active = shard.active_ips.entry(username.to_string()).or_default();
+        let active_contains_ip = user_active.contains_key(&ip);
+        let active_len = user_active.len();
+        let user_recent = shard.recent_ips.entry(username.to_string()).or_default();
+        let pruned_recent_entries = Self::prune_recent(user_recent, now, window);
+        Self::decrement_counter(&self.recent_entry_count, pruned_recent_entries);
+        let recent_contains_ip = user_recent.contains_key(&ip);
+        let recent_len = user_recent.len();
+
+        if active_contains_ip {
+            if !recent_contains_ip
+                && !Self::try_increment_counter(&self.recent_entry_count, MAX_RECENT_IP_ENTRIES)
+            {
+                self.recent_cap_rejects.fetch_add(1, Ordering::Relaxed);
+                return Err(format!(
+                    "IP tracker recent entry cap reached: entries={}/{}",
+                    self.recent_entry_count.load(Ordering::Relaxed),
+                    MAX_RECENT_IP_ENTRIES
+                ));
+            }
+            let Some(count) = shard
+                .active_ips
+                .get_mut(username)
+                .and_then(|user_active| user_active.get_mut(&ip))
+            else {
+                return Err(format!(
+                    "IP tracker active entry unavailable for user '{username}'"
+                ));
+            };
+            *count = count.saturating_add(1);
+            if let Some(user_recent) = shard.recent_ips.get_mut(username) {
+                user_recent.insert(ip, now);
+            }
+            return Ok(());
+        }
+
+        let is_new_ip = !recent_contains_ip;
+
+        if let Some(limit) = limit {
+            let active_limit_reached = active_len >= limit;
+            let recent_limit_reached = recent_len >= limit && is_new_ip;
+            let deny = match mode {
+                UserMaxUniqueIpsMode::ActiveWindow => active_limit_reached,
+                UserMaxUniqueIpsMode::TimeWindow => recent_limit_reached,
+                UserMaxUniqueIpsMode::Combined => active_limit_reached || recent_limit_reached,
+            };
+
+            if deny {
+                return Err(format!(
+                    "IP limit reached for user '{}': active={}/{} recent={}/{} mode={:?}",
+                    username, active_len, limit, recent_len, limit, mode
+                ));
+            }
+        }
+
+        if !Self::try_increment_counter(&self.active_entry_count, MAX_ACTIVE_IP_ENTRIES) {
+            self.active_cap_rejects.fetch_add(1, Ordering::Relaxed);
+            return Err(format!(
+                "IP tracker active entry cap reached: entries={}/{}",
+                self.active_entry_count.load(Ordering::Relaxed),
+                MAX_ACTIVE_IP_ENTRIES
+            ));
+        }
+        let mut reserved_recent = false;
+        if is_new_ip {
+            if !Self::try_increment_counter(&self.recent_entry_count, MAX_RECENT_IP_ENTRIES) {
+                Self::decrement_counter(&self.active_entry_count, 1);
+                self.recent_cap_rejects.fetch_add(1, Ordering::Relaxed);
+                return Err(format!(
+                    "IP tracker recent entry cap reached: entries={}/{}",
+                    self.recent_entry_count.load(Ordering::Relaxed),
+                    MAX_RECENT_IP_ENTRIES
+                ));
+            }
+            reserved_recent = true;
+        }
+
+        let Some(user_active) = shard.active_ips.get_mut(username) else {
+            Self::decrement_counter(&self.active_entry_count, 1);
+            if reserved_recent {
+                Self::decrement_counter(&self.recent_entry_count, 1);
+            }
+            return Err(format!(
+                "IP tracker active entry unavailable for user '{username}'"
+            ));
+        };
+        if user_active.insert(ip, 1).is_some() {
+            Self::decrement_counter(&self.active_entry_count, 1);
+        }
+        let Some(user_recent) = shard.recent_ips.get_mut(username) else {
+            Self::decrement_counter(&self.active_entry_count, 1);
+            if reserved_recent {
+                Self::decrement_counter(&self.recent_entry_count, 1);
+            }
+            return Err(format!(
+                "IP tracker recent entry unavailable for user '{username}'"
+            ));
+        };
+        if user_recent.insert(ip, now).is_some() && reserved_recent {
+            Self::decrement_counter(&self.recent_entry_count, 1);
+        }
+        Ok(())
+    }
+
+    pub async fn remove_ip(&self, username: &str, ip: IpAddr) {
+        self.maybe_compact_empty_users().await;
+        let shard_idx = Self::shard_idx(username);
+        let mut shard = self.shards[shard_idx].write().await;
+        let mut removed_active_entries = 0usize;
+        if let Some(user_ips) = shard.active_ips.get_mut(username) {
+            if let Some(count) = user_ips.get_mut(&ip) {
+                if *count > 1 {
+                    *count -= 1;
+                } else if user_ips.remove(&ip).is_some() {
+                    removed_active_entries = 1;
+                }
+            }
+            if user_ips.is_empty() {
+                shard.active_ips.remove(username);
+            }
+        }
+        Self::decrement_counter(&self.active_entry_count, removed_active_entries);
+    }
+}
@@ -0,0 +1,148 @@
+use super::*;
+
+impl UserIpTracker {
+    /// Queues a deferred active IP cleanup for a later async drain.
+    pub fn enqueue_cleanup(&self, user: String, ip: IpAddr) {
+        self.observe_cleanup_poison_for_tests();
+        let shard_idx = Self::shard_idx(&user);
+        let cleanup_shard = &self.cleanup_shards[shard_idx];
+        match cleanup_shard.queue.lock() {
+            Ok(mut queue) => {
+                let user_queue = queue.entry(user).or_default();
+                let count = user_queue.entry(ip).or_insert(0);
+                if *count == 0 {
+                    self.cleanup_queue_len.fetch_add(1, Ordering::Relaxed);
+                }
+                *count = count.saturating_add(1);
+                self.cleanup_deferred_releases
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            Err(poisoned) => {
+                let mut queue = poisoned.into_inner();
+                let user_queue = queue.entry(user.clone()).or_default();
+                let count = user_queue.entry(ip).or_insert(0);
+                if *count == 0 {
+                    self.cleanup_queue_len.fetch_add(1, Ordering::Relaxed);
+                }
+                *count = count.saturating_add(1);
+                self.cleanup_deferred_releases
+                    .fetch_add(1, Ordering::Relaxed);
+                cleanup_shard.queue.clear_poison();
+                tracing::warn!(
+                    "UserIpTracker cleanup_queue lock poisoned; recovered and enqueued IP cleanup for {} ({})",
+                    user,
+                    ip
+                );
+            }
+        }
+    }
+
+    #[cfg(test)]
+    pub(crate) fn cleanup_queue_len_for_tests(&self) -> usize {
+        self.cleanup_queue_len.load(Ordering::Relaxed) as usize
+    }
+
+    #[cfg(test)]
+    pub(crate) fn cleanup_queue_mutex_for_tests(
+        &self,
+    ) -> Arc<Mutex<HashMap<(String, IpAddr), usize>>> {
+        Arc::clone(&self.cleanup_queue_poison_probe)
+    }
+
+    pub(crate) async fn drain_cleanup_queue(&self) {
+        if self.cleanup_queue_len.load(Ordering::Relaxed) == 0 {
+            return;
+        }
+        for shard_idx in 0..USER_IP_TRACKER_SHARDS {
+            self.drain_cleanup_shard(shard_idx).await;
+        }
+    }
+
+    pub(super) async fn drain_cleanup_for_user(&self, user: &str) {
+        if self.cleanup_queue_len.load(Ordering::Relaxed) == 0 {
+            return;
+        }
+        let shard_idx = Self::shard_idx(user);
+        let cleanup_shard = &self.cleanup_shards[shard_idx];
+        let to_remove = match cleanup_shard.queue.lock() {
+            Ok(mut queue) => queue.remove(user).unwrap_or_default(),
+            Err(poisoned) => {
+                let mut queue = poisoned.into_inner();
+                let drained = queue.remove(user).unwrap_or_default();
+                cleanup_shard.queue.clear_poison();
+                drained
+            }
+        };
+        if to_remove.is_empty() {
+            return;
+        }
+        self.cleanup_queue_len
+            .fetch_sub(to_remove.len() as u64, Ordering::Relaxed);
+        let mut shard = self.shards[shard_idx].write().await;
+        let mut removed_active_entries = 0usize;
+        for (ip, pending_count) in to_remove {
+            removed_active_entries = removed_active_entries.saturating_add(
+                Self::apply_active_cleanup(&mut shard.active_ips, user, ip, pending_count),
+            );
+        }
+        Self::decrement_counter(&self.active_entry_count, removed_active_entries);
+    }
+
+    pub(super) async fn drain_cleanup_shard(&self, shard_idx: usize) {
+        let Ok(_drain_guard) = self.cleanup_drain_locks[shard_idx].try_lock() else {
+            return;
+        };
+
+        let cleanup_shard = &self.cleanup_shards[shard_idx];
+        let to_remove = {
+            match cleanup_shard.queue.lock() {
+                Ok(mut queue) => {
+                    if queue.is_empty() {
+                        return;
+                    }
+                    let mut drained =
+                        HashMap::with_capacity(queue.len().min(CLEANUP_DRAIN_BATCH_LIMIT));
+                    for _ in 0..CLEANUP_DRAIN_BATCH_LIMIT {
+                        let Some((user, ip, count)) = Self::pop_one_cleanup(&mut queue) else {
+                            break;
+                        };
+                        self.cleanup_queue_len.fetch_sub(1, Ordering::Relaxed);
+                        drained.insert((user, ip), count);
+                    }
+                    drained
+                }
+                Err(poisoned) => {
+                    let mut queue = poisoned.into_inner();
+                    if queue.is_empty() {
+                        cleanup_shard.queue.clear_poison();
+                        return;
+                    }
+                    let mut drained =
+                        HashMap::with_capacity(queue.len().min(CLEANUP_DRAIN_BATCH_LIMIT));
+                    for _ in 0..CLEANUP_DRAIN_BATCH_LIMIT {
+                        let Some((user, ip, count)) = Self::pop_one_cleanup(&mut queue) else {
+                            break;
+                        };
+                        self.cleanup_queue_len.fetch_sub(1, Ordering::Relaxed);
+                        drained.insert((user, ip), count);
+                    }
+                    cleanup_shard.queue.clear_poison();
+                    drained
+                }
+            }
+        };
+        drop(_drain_guard);
+        if to_remove.is_empty() {
+            return;
+        }
+
+        let mut shard = self.shards[shard_idx].write().await;
+        let mut removed_active_entries = 0usize;
+        for ((user, ip), pending_count) in to_remove {
+            removed_active_entries = removed_active_entries.saturating_add(
+                Self::apply_active_cleanup(&mut shard.active_ips, &user, ip, pending_count),
+            );
+        }
+        Self::decrement_counter(&self.active_entry_count, removed_active_entries);
+    }
+}
@@ -0,0 +1,309 @@
+use super::*;
+
+impl UserIpTracker {
+    pub(super) async fn maybe_compact_empty_users(&self) {
+        const COMPACT_INTERVAL_SECS: u64 = 60;
+        let now_epoch_secs = Self::now_epoch_secs();
+        let last_compact_epoch_secs = self.last_compact_epoch_secs.load(Ordering::Relaxed);
+        if now_epoch_secs.saturating_sub(last_compact_epoch_secs) < COMPACT_INTERVAL_SECS {
+            return;
+        }
+        if self
+            .last_compact_epoch_secs
+            .compare_exchange(
+                last_compact_epoch_secs,
+                now_epoch_secs,
+                Ordering::AcqRel,
+                Ordering::Relaxed,
+            )
+            .is_err()
+        {
+            return;
+        }
+
+        let window = self.limit_window();
+        let now = Instant::now();
+        for shard_lock in self.shards.iter() {
+            let mut shard = shard_lock.write().await;
+            let mut pruned_recent_entries = 0usize;
+            for user_recent in shard.recent_ips.values_mut() {
+                pruned_recent_entries = pruned_recent_entries.saturating_add(Self::prune_recent(
+                    user_recent,
+                    now,
+                    window,
+                ));
+            }
+            Self::decrement_counter(&self.recent_entry_count, pruned_recent_entries);
+
+            let mut users = Vec::<String>::with_capacity(
+                shard
+                    .active_ips
+                    .len()
+                    .saturating_add(shard.recent_ips.len()),
+            );
+            users.extend(shard.active_ips.keys().cloned());
+            for user in shard.recent_ips.keys() {
+                if !shard.active_ips.contains_key(user) {
+                    users.push(user.clone());
+                }
+            }
+
+            for user in users {
+                let active_empty = shard
+                    .active_ips
+                    .get(&user)
+                    .map(|ips| ips.is_empty())
+                    .unwrap_or(true);
+                let recent_empty = shard
+                    .recent_ips
+                    .get(&user)
+                    .map(|ips| ips.is_empty())
+                    .unwrap_or(true);
+                if active_empty && recent_empty {
+                    shard.active_ips.remove(&user);
+                    shard.recent_ips.remove(&user);
+                }
+            }
+        }
+    }
+
+    pub async fn run_periodic_maintenance(self: Arc<Self>) {
+        let mut interval = tokio::time::interval(Duration::from_secs(1));
+        loop {
+            interval.tick().await;
+            self.drain_cleanup_queue().await;
+            self.maybe_compact_empty_users().await;
+        }
+    }
+
+    pub async fn memory_stats(&self) -> UserIpTrackerMemoryStats {
+        let cleanup_queue_len = self.cleanup_queue_len.load(Ordering::Relaxed) as usize;
+        let mut active_users = 0usize;
+        let mut recent_users = 0usize;
+        let mut active_entries = 0usize;
+        let mut recent_entries = 0usize;
+        for shard_lock in self.shards.iter() {
+            let shard = shard_lock.read().await;
+            active_users = active_users.saturating_add(shard.active_ips.len());
+            recent_users = recent_users.saturating_add(shard.recent_ips.len());
+            active_entries =
+                active_entries.saturating_add(shard.active_ips.values().map(HashMap::len).sum());
+            recent_entries =
+                recent_entries.saturating_add(shard.recent_ips.values().map(HashMap::len).sum());
+        }
+
+        UserIpTrackerMemoryStats {
+            active_users,
+            recent_users,
+            active_entries,
+            recent_entries,
+            cleanup_queue_len,
+            active_cap_rejects: self.active_cap_rejects.load(Ordering::Relaxed),
+            recent_cap_rejects: self.recent_cap_rejects.load(Ordering::Relaxed),
+            cleanup_deferred_releases: self.cleanup_deferred_releases.load(Ordering::Relaxed),
+        }
+    }
+
+    pub async fn get_recent_counts_for_users(&self, users: &[String]) -> HashMap<String, usize> {
+        self.drain_cleanup_queue().await;
+        self.get_recent_counts_for_users_snapshot(users).await
+    }
+
+    pub(crate) async fn get_recent_counts_for_users_snapshot(
+        &self,
+        users: &[String],
+    ) -> HashMap<String, usize> {
+        let window = self.limit_window();
+        let now = Instant::now();
+
+        let mut counts = HashMap::with_capacity(users.len());
+        for user in users {
+            let shard_idx = Self::shard_idx(user);
+            let shard = self.shards[shard_idx].read().await;
+            let count = if let Some(user_recent) = shard.recent_ips.get(user) {
+                user_recent
+                    .values()
+                    .filter(|seen_at| now.duration_since(**seen_at) <= window)
+                    .count()
+            } else {
+                0
+            };
+            counts.insert(user.clone(), count);
+        }
+        counts
+    }
+
+    pub async fn get_active_ips_for_users(&self, users: &[String]) -> HashMap<String, Vec<IpAddr>> {
+        self.drain_cleanup_queue().await;
+        let mut out = HashMap::with_capacity(users.len());
+        for user in users {
+            let shard_idx = Self::shard_idx(user);
+            let shard = self.shards[shard_idx].read().await;
+            let mut ips = shard
+                .active_ips
+                .get(user)
+                .map(|per_ip| per_ip.keys().copied().collect::<Vec<_>>())
+                .unwrap_or_else(Vec::new);
+            ips.sort();
+            out.insert(user.clone(), ips);
+        }
+        out
+    }
+
+    pub async fn get_recent_ips_for_users(&self, users: &[String]) -> HashMap<String, Vec<IpAddr>> {
+        self.drain_cleanup_queue().await;
+        let window = self.limit_window();
+        let now = Instant::now();
+
+        let mut out = HashMap::with_capacity(users.len());
+        for user in users {
+            let shard_idx = Self::shard_idx(user);
+            let shard = self.shards[shard_idx].read().await;
+            let mut ips = if let Some(user_recent) = shard.recent_ips.get(user) {
+                user_recent
+                    .iter()
+                    .filter(|(_, seen_at)| now.duration_since(**seen_at) <= window)
+                    .map(|(ip, _)| *ip)
+                    .collect::<Vec<_>>()
+            } else {
+                Vec::new()
+            };
+            ips.sort();
+            out.insert(user.clone(), ips);
+        }
+        out
+    }
+
+    pub async fn get_active_ip_count(&self, username: &str) -> usize {
+        self.drain_cleanup_queue().await;
+        let shard_idx = Self::shard_idx(username);
+        let shard = self.shards[shard_idx].read().await;
+        shard
+            .active_ips
+            .get(username)
+            .map(|ips| ips.len())
+            .unwrap_or(0)
+    }
+
+    pub async fn get_active_ips(&self, username: &str) -> Vec<IpAddr> {
+        self.drain_cleanup_queue().await;
+        let shard_idx = Self::shard_idx(username);
+        let shard = self.shards[shard_idx].read().await;
+        shard
+            .active_ips
+            .get(username)
+            .map(|ips| ips.keys().copied().collect())
+            .unwrap_or_else(Vec::new)
+    }
+
+    pub async fn get_stats(&self) -> Vec<(String, usize, usize)> {
+        self.drain_cleanup_queue().await;
+        self.get_stats_snapshot().await
+    }
+
+    pub(crate) async fn get_stats_snapshot(&self) -> Vec<(String, usize, usize)> {
+        let mut active_counts = Vec::new();
+        for shard_lock in self.shards.iter() {
+            let shard = shard_lock.read().await;
+            active_counts.extend(
+                shard
+                    .active_ips
+                    .iter()
+                    .map(|(username, user_ips)| (username.clone(), user_ips.len())),
+            );
+        }
+
+        let mut stats = Vec::with_capacity(active_counts.len());
+        for (username, active_count) in active_counts {
+            let limit = self.user_limit(&username).unwrap_or(0);
+            stats.push((username, active_count, limit));
+        }
+
+        stats.sort_by(|a, b| a.0.cmp(&b.0));
+        stats
+    }
+
+    pub async fn clear_user_ips(&self, username: &str) {
+        let shard_idx = Self::shard_idx(username);
+        let mut shard = self.shards[shard_idx].write().await;
+        let removed_active_entries = shard
+            .active_ips
+            .remove(username)
+            .map(|ips| ips.len())
+            .unwrap_or(0);
+        Self::decrement_counter(&self.active_entry_count, removed_active_entries);
+
+        let removed_recent_entries = shard
+            .recent_ips
+            .remove(username)
+            .map(|ips| ips.len())
+            .unwrap_or(0);
+        Self::decrement_counter(&self.recent_entry_count, removed_recent_entries);
+    }
+
+    pub async fn clear_all(&self) {
+        for shard_lock in self.shards.iter() {
+            let mut shard = shard_lock.write().await;
+            shard.active_ips.clear();
+            shard.recent_ips.clear();
+        }
+        self.active_entry_count.store(0, Ordering::Relaxed);
+        self.recent_entry_count.store(0, Ordering::Relaxed);
+        for cleanup_shard in self.cleanup_shards.iter() {
+            match cleanup_shard.queue.lock() {
+                Ok(mut queue) => queue.clear(),
+                Err(poisoned) => {
+                    poisoned.into_inner().clear();
+                    cleanup_shard.queue.clear_poison();
+                }
+            }
+        }
+        self.cleanup_queue_len.store(0, Ordering::Relaxed);
+    }
+
+    pub async fn is_ip_active(&self, username: &str, ip: IpAddr) -> bool {
+        self.drain_cleanup_queue().await;
+        let shard_idx = Self::shard_idx(username);
+        let shard = self.shards[shard_idx].read().await;
+        shard
+            .active_ips
+            .get(username)
+            .map(|ips| ips.contains_key(&ip))
+            .unwrap_or(false)
+    }
+
+    pub async fn get_user_limit(&self, username: &str) -> Option<usize> {
+        self.user_limit(username)
+    }
+
+    pub async fn format_stats(&self) -> String {
+        let stats = self.get_stats().await;
+
+        if stats.is_empty() {
+            return String::from("No active users");
+        }
+
+        let mut output = String::from("User IP Statistics:\n");
+        output.push_str("==================\n");
+
+        for (username, active_count, limit) in stats {
+            output.push_str(&format!(
+                "User: {:<20} Active IPs: {}/{}\n",
+                username,
+                active_count,
+                if limit > 0 {
+                    limit.to_string()
+                } else {
+                    "unlimited".to_string()
+                }
+            ));
+
+            let ips = self.get_active_ips(&username).await;
+            for ip in ips {
+                output.push_str(&format!("  - {}\n", ip));
+            }
+        }
+
+        output
+    }
+}
@@ -0,0 +1,385 @@
+use super::*;
+use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+use std::sync::atomic::Ordering;
+
+fn test_ipv4(oct1: u8, oct2: u8, oct3: u8, oct4: u8) -> IpAddr {
+    IpAddr::V4(Ipv4Addr::new(oct1, oct2, oct3, oct4))
+}
+
+fn test_ipv6() -> IpAddr {
+    IpAddr::V6(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 1))
+}
+
+#[tokio::test]
+async fn test_basic_ip_limit() {
+    let tracker = UserIpTracker::new();
+    tracker.set_user_limit("test_user", 2).await;
+
+    let ip1 = test_ipv4(192, 168, 1, 1);
+    let ip2 = test_ipv4(192, 168, 1, 2);
+    let ip3 = test_ipv4(192, 168, 1, 3);
+
+    assert!(tracker.check_and_add("test_user", ip1).await.is_ok());
+    assert!(tracker.check_and_add("test_user", ip2).await.is_ok());
+    assert!(tracker.check_and_add("test_user", ip3).await.is_err());
+
+    assert_eq!(tracker.get_active_ip_count("test_user").await, 2);
+}
+
+#[tokio::test]
+async fn test_active_window_rejects_new_ip_and_keeps_existing_session() {
+    let tracker = UserIpTracker::new();
+    tracker.set_user_limit("test_user", 1).await;
+    tracker
+        .set_limit_policy(UserMaxUniqueIpsMode::ActiveWindow, 30)
+        .await;
+
+    let ip1 = test_ipv4(10, 10, 10, 1);
+    let ip2 = test_ipv4(10, 10, 10, 2);
+
+    assert!(tracker.check_and_add("test_user", ip1).await.is_ok());
+    assert!(tracker.is_ip_active("test_user", ip1).await);
+    assert!(tracker.check_and_add("test_user", ip2).await.is_err());
+
+    // Existing session remains active; only new unique IP is denied.
+    assert!(tracker.is_ip_active("test_user", ip1).await);
+    assert_eq!(tracker.get_active_ip_count("test_user").await, 1);
+}
+
+#[tokio::test]
+async fn test_reconnection_from_same_ip() {
+    let tracker = UserIpTracker::new();
+    tracker.set_user_limit("test_user", 2).await;
+
+    let ip1 = test_ipv4(192, 168, 1, 1);
+
+    assert!(tracker.check_and_add("test_user", ip1).await.is_ok());
+    assert!(tracker.check_and_add("test_user", ip1).await.is_ok());
+    assert_eq!(tracker.get_active_ip_count("test_user").await, 1);
+}
+
+#[tokio::test]
+async fn test_same_ip_disconnect_keeps_active_while_other_session_alive() {
+    let tracker = UserIpTracker::new();
+    tracker.set_user_limit("test_user", 2).await;
+
+    let ip1 = test_ipv4(192, 168, 1, 1);
+
+    assert!(tracker.check_and_add("test_user", ip1).await.is_ok());
+    assert!(tracker.check_and_add("test_user", ip1).await.is_ok());
+    assert_eq!(tracker.get_active_ip_count("test_user").await, 1);
+
+    tracker.remove_ip("test_user", ip1).await;
+    assert_eq!(tracker.get_active_ip_count("test_user").await, 1);
+
+    tracker.remove_ip("test_user", ip1).await;
+    assert_eq!(tracker.get_active_ip_count("test_user").await, 0);
+}
+
+#[tokio::test]
+async fn test_ip_removal() {
+    let tracker = UserIpTracker::new();
+    tracker.set_user_limit("test_user", 2).await;
+
+    let ip1 = test_ipv4(192, 168, 1, 1);
+    let ip2 = test_ipv4(192, 168, 1, 2);
+    let ip3 = test_ipv4(192, 168, 1, 3);
+
+    assert!(tracker.check_and_add("test_user", ip1).await.is_ok());
+    assert!(tracker.check_and_add("test_user", ip2).await.is_ok());
+    assert!(tracker.check_and_add("test_user", ip3).await.is_err());
+
+    tracker.remove_ip("test_user", ip1).await;
+
+    assert!(tracker.check_and_add("test_user", ip3).await.is_ok());
+    assert_eq!(tracker.get_active_ip_count("test_user").await, 2);
+}
+
+#[tokio::test]
+async fn test_no_limit() {
+    let tracker = UserIpTracker::new();
+
+    let ip1 = test_ipv4(192, 168, 1, 1);
+    let ip2 = test_ipv4(192, 168, 1, 2);
+    let ip3 = test_ipv4(192, 168, 1, 3);
+
+    assert!(tracker.check_and_add("test_user", ip1).await.is_ok());
+    assert!(tracker.check_and_add("test_user", ip2).await.is_ok());
+    assert!(tracker.check_and_add("test_user", ip3).await.is_ok());
+
+    assert_eq!(tracker.get_active_ip_count("test_user").await, 3);
+}
+
+#[tokio::test]
+async fn test_multiple_users() {
+    let tracker = UserIpTracker::new();
+    tracker.set_user_limit("user1", 2).await;
+    tracker.set_user_limit("user2", 1).await;
+
+    let ip1 = test_ipv4(192, 168, 1, 1);
+    let ip2 = test_ipv4(192, 168, 1, 2);
+
+    assert!(tracker.check_and_add("user1", ip1).await.is_ok());
+    assert!(tracker.check_and_add("user1", ip2).await.is_ok());
+
+    assert!(tracker.check_and_add("user2", ip1).await.is_ok());
+    assert!(tracker.check_and_add("user2", ip2).await.is_err());
+}
+
+#[tokio::test]
+async fn test_ipv6_support() {
+    let tracker = UserIpTracker::new();
+    tracker.set_user_limit("test_user", 2).await;
+
+    let ipv4 = test_ipv4(192, 168, 1, 1);
+    let ipv6 = test_ipv6();
+
+    assert!(tracker.check_and_add("test_user", ipv4).await.is_ok());
+    assert!(tracker.check_and_add("test_user", ipv6).await.is_ok());
+
+    assert_eq!(tracker.get_active_ip_count("test_user").await, 2);
+}
+
+#[tokio::test]
+async fn test_get_active_ips() {
+    let tracker = UserIpTracker::new();
+    tracker.set_user_limit("test_user", 3).await;
+
+    let ip1 = test_ipv4(192, 168, 1, 1);
+    let ip2 = test_ipv4(192, 168, 1, 2);
+
+    tracker.check_and_add("test_user", ip1).await.unwrap();
+    tracker.check_and_add("test_user", ip2).await.unwrap();
+
+    let active_ips = tracker.get_active_ips("test_user").await;
+    assert_eq!(active_ips.len(), 2);
+    assert!(active_ips.contains(&ip1));
+    assert!(active_ips.contains(&ip2));
+}
+
+#[tokio::test]
+async fn test_stats() {
+    let tracker = UserIpTracker::new();
+    tracker.set_user_limit("user1", 3).await;
+    tracker.set_user_limit("user2", 2).await;
+
+    let ip1 = test_ipv4(192, 168, 1, 1);
+    let ip2 = test_ipv4(192, 168, 1, 2);
+
+    tracker.check_and_add("user1", ip1).await.unwrap();
+    tracker.check_and_add("user2", ip2).await.unwrap();
+
+    let stats = tracker.get_stats().await;
+    assert_eq!(stats.len(), 2);
+
+    assert!(stats.iter().any(|(name, _, _)| name == "user1"));
+    assert!(stats.iter().any(|(name, _, _)| name == "user2"));
+}
+
+#[tokio::test]
+async fn test_clear_user_ips() {
+    let tracker = UserIpTracker::new();
+    let ip1 = test_ipv4(192, 168, 1, 1);
+
+    tracker.check_and_add("test_user", ip1).await.unwrap();
+    assert_eq!(tracker.get_active_ip_count("test_user").await, 1);
+
+    tracker.clear_user_ips("test_user").await;
+    assert_eq!(tracker.get_active_ip_count("test_user").await, 0);
+}
+
+#[tokio::test]
+async fn test_is_ip_active() {
+    let tracker = UserIpTracker::new();
+    let ip1 = test_ipv4(192, 168, 1, 1);
+    let ip2 = test_ipv4(192, 168, 1, 2);
+
+    tracker.check_and_add("test_user", ip1).await.unwrap();
+
+    assert!(tracker.is_ip_active("test_user", ip1).await);
+    assert!(!tracker.is_ip_active("test_user", ip2).await);
+}
+
+#[tokio::test]
+async fn test_load_limits_from_config() {
+    let tracker = UserIpTracker::new();
+
+    let mut config_limits = HashMap::new();
+    config_limits.insert("user1".to_string(), 5);
+    config_limits.insert("user2".to_string(), 3);
+
+    tracker.load_limits(0, &config_limits).await;
+
+    assert_eq!(tracker.get_user_limit("user1").await, Some(5));
+    assert_eq!(tracker.get_user_limit("user2").await, Some(3));
+    assert_eq!(tracker.get_user_limit("user3").await, None);
+}
+
+#[tokio::test]
+async fn test_load_limits_replaces_previous_map() {
+    let tracker = UserIpTracker::new();
+
+    let mut first = HashMap::new();
+    first.insert("user1".to_string(), 2);
+    first.insert("user2".to_string(), 3);
+    tracker.load_limits(0, &first).await;
+
+    let mut second = HashMap::new();
+    second.insert("user2".to_string(), 5);
+    tracker.load_limits(0, &second).await;
+
+    assert_eq!(tracker.get_user_limit("user1").await, None);
+    assert_eq!(tracker.get_user_limit("user2").await, Some(5));
+}
+
+#[tokio::test]
+async fn test_global_each_limit_applies_without_user_override() {
+    let tracker = UserIpTracker::new();
+    tracker.load_limits(2, &HashMap::new()).await;
+
+    let ip1 = test_ipv4(172, 16, 0, 1);
+    let ip2 = test_ipv4(172, 16, 0, 2);
+    let ip3 = test_ipv4(172, 16, 0, 3);
+
+    assert!(tracker.check_and_add("test_user", ip1).await.is_ok());
+    assert!(tracker.check_and_add("test_user", ip2).await.is_ok());
+    assert!(tracker.check_and_add("test_user", ip3).await.is_err());
+    assert_eq!(tracker.get_user_limit("test_user").await, Some(2));
+}
+
+#[tokio::test]
+async fn test_user_override_wins_over_global_each_limit() {
+    let tracker = UserIpTracker::new();
+    let mut limits = HashMap::new();
+    limits.insert("test_user".to_string(), 1);
+    tracker.load_limits(3, &limits).await;
+
+    let ip1 = test_ipv4(172, 17, 0, 1);
+    let ip2 = test_ipv4(172, 17, 0, 2);
+
+    assert!(tracker.check_and_add("test_user", ip1).await.is_ok());
+    assert!(tracker.check_and_add("test_user", ip2).await.is_err());
+    assert_eq!(tracker.get_user_limit("test_user").await, Some(1));
+}
+
+#[tokio::test]
+async fn test_time_window_mode_blocks_recent_ip_churn() {
+    let tracker = UserIpTracker::new();
+    tracker.set_user_limit("test_user", 1).await;
+    tracker
+        .set_limit_policy(UserMaxUniqueIpsMode::TimeWindow, 30)
+        .await;
+
+    let ip1 = test_ipv4(10, 0, 0, 1);
+    let ip2 = test_ipv4(10, 0, 0, 2);
+
+    assert!(tracker.check_and_add("test_user", ip1).await.is_ok());
+    tracker.remove_ip("test_user", ip1).await;
+    assert!(tracker.check_and_add("test_user", ip2).await.is_err());
+}
+
+#[tokio::test]
+async fn test_combined_mode_enforces_active_and_recent_limits() {
+    let tracker = UserIpTracker::new();
+    tracker.set_user_limit("test_user", 1).await;
+    tracker
+        .set_limit_policy(UserMaxUniqueIpsMode::Combined, 30)
+        .await;
+
+    let ip1 = test_ipv4(10, 0, 1, 1);
+    let ip2 = test_ipv4(10, 0, 1, 2);
+
+    assert!(tracker.check_and_add("test_user", ip1).await.is_ok());
+    assert!(tracker.check_and_add("test_user", ip2).await.is_err());
+
+    tracker.remove_ip("test_user", ip1).await;
+    assert!(tracker.check_and_add("test_user", ip2).await.is_err());
+}
+
+#[tokio::test]
+async fn test_time_window_expires() {
+    let tracker = UserIpTracker::new();
+    tracker.set_user_limit("test_user", 1).await;
+    tracker
+        .set_limit_policy(UserMaxUniqueIpsMode::TimeWindow, 1)
+        .await;
+
+    let ip1 = test_ipv4(10, 1, 0, 1);
+    let ip2 = test_ipv4(10, 1, 0, 2);
+
+    assert!(tracker.check_and_add("test_user", ip1).await.is_ok());
+    tracker.remove_ip("test_user", ip1).await;
+    assert!(tracker.check_and_add("test_user", ip2).await.is_err());
+
+    tokio::time::sleep(Duration::from_millis(1100)).await;
+    assert!(tracker.check_and_add("test_user", ip2).await.is_ok());
+}
+
+#[tokio::test]
+async fn test_memory_stats_reports_queue_and_entry_counts() {
+    let tracker = UserIpTracker::new();
+    tracker.set_user_limit("test_user", 4).await;
+    let ip1 = test_ipv4(10, 2, 0, 1);
+    let ip2 = test_ipv4(10, 2, 0, 2);
+
+    tracker.check_and_add("test_user", ip1).await.unwrap();
+    tracker.check_and_add("test_user", ip2).await.unwrap();
+    tracker.enqueue_cleanup("test_user".to_string(), ip1);
+
+    let snapshot = tracker.memory_stats().await;
+    assert_eq!(snapshot.active_users, 1);
+    assert_eq!(snapshot.recent_users, 1);
+    assert_eq!(snapshot.active_entries, 2);
+    assert_eq!(snapshot.recent_entries, 2);
+    assert_eq!(snapshot.cleanup_queue_len, 1);
+}
+
+#[tokio::test]
+async fn test_compact_prunes_stale_recent_entries() {
+    let tracker = UserIpTracker::new();
+    tracker
+        .set_limit_policy(UserMaxUniqueIpsMode::TimeWindow, 1)
+        .await;
+
+    let stale_user = "stale-user".to_string();
+    let stale_ip = test_ipv4(10, 3, 0, 1);
+    {
+        let shard_idx = UserIpTracker::shard_idx(&stale_user);
+        let mut shard = tracker.shards[shard_idx].write().await;
+        shard
+            .recent_ips
+            .entry(stale_user.clone())
+            .or_insert_with(HashMap::new)
+            .insert(stale_ip, Instant::now() - Duration::from_secs(5));
+    }
+
+    tracker.last_compact_epoch_secs.store(0, Ordering::Relaxed);
+    tracker
+        .check_and_add("trigger-user", test_ipv4(10, 3, 0, 2))
+        .await
+        .unwrap();
+
+    let shard_idx = UserIpTracker::shard_idx(&stale_user);
+    let shard = tracker.shards[shard_idx].read().await;
+    let stale_exists = shard
+        .recent_ips
+        .get(&stale_user)
+        .map(|ips| ips.contains_key(&stale_ip))
+        .unwrap_or(false);
+    assert!(!stale_exists);
+}
+
+#[tokio::test]
+async fn test_time_window_allows_same_ip_reconnect() {
+    let tracker = UserIpTracker::new();
+    tracker.set_user_limit("test_user", 1).await;
+    tracker
+        .set_limit_policy(UserMaxUniqueIpsMode::TimeWindow, 1)
+        .await;
+
+    let ip1 = test_ipv4(10, 4, 0, 1);
+
+    assert!(tracker.check_and_add("test_user", ip1).await.is_ok());
+    tracker.remove_ip("test_user", ip1).await;
+    assert!(tracker.check_and_add("test_user", ip1).await.is_ok());
+}
@@ -1,7 +1,7 @@
 use std::sync::Arc;
 use std::time::{Duration, Instant};

-use tokio::sync::watch;
+use tokio::sync::{RwLock, watch};
 use tracing::{info, warn};

 use crate::config::ProxyConfig;
@@ -14,24 +14,32 @@ const RUNTIME_FALLBACK_AFTER: Duration = Duration::from_secs(6);
 pub(crate) async fn configure_admission_gate(
    config: &Arc<ProxyConfig>,
    me_pool: Option<Arc<MePool>>,
+    me_pool_runtime: Arc<RwLock<Option<Arc<MePool>>>>,
    route_runtime: Arc<RouteRuntimeController>,
    admission_tx: &watch::Sender<bool>,
    config_rx: watch::Receiver<Arc<ProxyConfig>>,
    me_ready_rx: watch::Receiver<u64>,
 ) {
    if config.general.use_middle_proxy {
-        if let Some(pool) = me_pool.as_ref() {
-            let initial_ready = pool.admission_ready_conditional_cast().await;
+        if me_pool.is_some() || config.general.me2dc_fallback {
+            let initial_pool = match me_pool.as_ref() {
+                Some(pool) => Some(pool.clone()),
+                None => me_pool_runtime.read().await.clone(),
+            };
+            let initial_ready = match initial_pool.as_ref() {
+                Some(pool) => pool.admission_ready_conditional_cast().await,
+                None => false,
+            };
            let mut fallback_enabled = config.general.me2dc_fallback;
            let mut fast_fallback_enabled = fallback_enabled && config.general.me2dc_fast;
            let (initial_gate_open, initial_route_mode, initial_fallback_reason) = if initial_ready
            {
                (true, RelayRouteMode::Middle, None)
-            } else if fast_fallback_enabled {
+            } else if fallback_enabled {
                (
                    true,
                    RelayRouteMode::Direct,
-                    Some("fast_not_ready_fallback"),
+                    Some("startup_direct_fallback"),
                )
            } else {
                (false, RelayRouteMode::Middle, None)
@@ -49,7 +57,8 @@ pub(crate) async fn configure_admission_gate(
                warn!("Conditional-admission gate: closed / ME pool is NOT ready)");
            }

-            let pool_for_gate = pool.clone();
+            let mut pool_for_gate = initial_pool;
+            let pool_runtime_for_gate = me_pool_runtime.clone();
            let admission_tx_gate = admission_tx.clone();
            let route_runtime_gate = route_runtime.clone();
            let mut config_rx_gate = config_rx.clone();
@@ -83,12 +92,27 @@ pub(crate) async fn configure_admission_gate(
                        }
                        _ = tokio::time::sleep(Duration::from_millis(admission_poll_ms)) => {}
                    }
-                    let ready = pool_for_gate.admission_ready_conditional_cast().await;
+                    if pool_for_gate.is_none() {
+                        pool_for_gate = pool_runtime_for_gate.read().await.clone();
+                    }
+                    let ready = match pool_for_gate.as_ref() {
+                        Some(pool) => pool.admission_ready_conditional_cast().await,
+                        None => false,
+                    };
                    let now = Instant::now();
                    let (next_gate_open, next_route_mode, next_fallback_reason) = if ready {
                        ready_observed = true;
                        not_ready_since = None;
+                        if let Some(pool) = pool_for_gate.as_ref() {
+                            pool.set_runtime_ready(true);
+                        }
                        (true, RelayRouteMode::Middle, None)
+                    } else if fallback_enabled && !ready_observed {
+                        (
+                            true,
+                            RelayRouteMode::Direct,
+                            Some("startup_direct_fallback"),
+                        )
                    } else if fast_fallback_enabled {
                        (
                            true,
@@ -122,7 +146,14 @@ pub(crate) async fn configure_admission_gate(
                                );
                            } else {
                                let fallback_reason = next_fallback_reason.unwrap_or("unknown");
-                                if fallback_reason == "strict_grace_fallback" {
+                                if fallback_reason == "startup_direct_fallback" {
+                                    warn!(
+                                        target_mode = route_mode.as_str(),
+                                        cutover_generation = snapshot.generation,
+                                        fallback_reason,
+                                        "ME pool not-ready during startup; routing new sessions via Direct-DC"
+                                    );
+                                } else if fallback_reason == "strict_grace_fallback" {
                                    let fallback_after = if ready_observed {
                                        RUNTIME_FALLBACK_AFTER
                                    } else {
@@ -147,7 +147,7 @@ pub(crate) async fn run_startup_connectivity(
            .any(|r| r.rtt_ms.is_some());

        if upstream_result.both_available {
-            if prefer_ipv6 {
+            if upstream_result.prefer_ipv6 {
                info!("  IPv6 in use / IPv4 is fallback");
            } else {
                info!("  IPv4 in use / IPv6 is fallback");
@@ -1,6 +1,7 @@
 #![allow(clippy::items_after_test_module)]

 use std::path::{Path, PathBuf};
+use std::sync::atomic::{AtomicBool, Ordering};
 use std::time::Duration;

 use tokio::sync::watch;
@@ -15,6 +16,32 @@ use crate::transport::middle_proxy::{
    save_proxy_config_cache,
 };

+const MAESTRO_COLOR: &str = "\x1b[92m";
+const COLOR_RESET: &str = "\x1b[0m";
+
+static MAESTRO_COLORS_ENABLED: AtomicBool = AtomicBool::new(true);
+
+/// Enables or disables ANSI color in direct MAESTRO status lines.
+pub(crate) fn set_maestro_colors_enabled(enabled: bool) {
+    MAESTRO_COLORS_ENABLED.store(enabled, Ordering::Relaxed);
+}
+
+fn format_maestro_line(message: impl AsRef<str>, colors_enabled: bool) -> String {
+    if colors_enabled {
+        format!("{MAESTRO_COLOR}MAESTRO{COLOR_RESET}: {}", message.as_ref())
+    } else {
+        format!("MAESTRO: {}", message.as_ref())
+    }
+}
+
+/// Prints a direct MAESTRO status line outside the tracing subscriber.
+pub(crate) fn print_maestro_line(message: impl AsRef<str>) {
+    eprintln!(
+        "{}",
+        format_maestro_line(message, MAESTRO_COLORS_ENABLED.load(Ordering::Relaxed))
+    );
+}
+
 pub(crate) fn resolve_runtime_config_path(
    config_path_cli: &str,
    startup_cwd: &Path,
@@ -267,11 +294,24 @@ mod tests {
    use std::path::{Path, PathBuf};

    use super::{
-        expected_handshake_close_description, is_expected_handshake_eof, peer_close_description,
-        resolve_runtime_base_dir, resolve_runtime_config_path,
+        expected_handshake_close_description, format_maestro_line, is_expected_handshake_eof,
+        peer_close_description, resolve_runtime_base_dir, resolve_runtime_config_path,
    };
    use crate::error::{ProxyError, StreamError};

+    #[test]
+    fn maestro_line_formatter_respects_disabled_colors() {
+        let plain = format_maestro_line("boot", false);
+        assert_eq!(plain, "MAESTRO: boot");
+        assert!(!plain.contains('\x1b'));
+    }
+
+    #[test]
+    fn maestro_line_formatter_keeps_color_when_enabled() {
+        let colored = format_maestro_line("boot", true);
+        assert!(colored.contains("\x1b[92mMAESTRO\x1b[0m"));
+    }
+
    #[test]
    fn resolve_runtime_config_path_anchors_relative_to_startup_cwd() {
        let nonce = std::time::SystemTime::now()
@@ -501,7 +541,7 @@ mod tests {
 }

 pub(crate) fn print_proxy_links(host: &str, port: u16, config: &ProxyConfig) {
-    info!(target: "telemt::links", "--- Proxy Links ({}) ---", host);
+    print_maestro_line(format!("Proxy links ({host})"));
    for user_name in config
        .general
        .links
@@ -509,20 +549,16 @@ pub(crate) fn print_proxy_links(host: &str, port: u16, config: &ProxyConfig) {
        .resolve_users(&config.access.users)
    {
        if let Some(secret) = config.access.users.get(user_name) {
-            info!(target: "telemt::links", "User: {}", user_name);
+            print_maestro_line(format!("User: {user_name}"));
            if config.general.modes.classic {
-                info!(
-                    target: "telemt::links",
-                    "  Classic: tg://proxy?server={}&port={}&secret={}",
-                    host, port, secret
-                );
+                print_maestro_line(format!(
+                    "Classic: tg://proxy?server={host}&port={port}&secret={secret}"
+                ));
            }
            if config.general.modes.secure {
-                info!(
-                    target: "telemt::links",
-                    "  DD:      tg://proxy?server={}&port={}&secret=dd{}",
-                    host, port, secret
-                );
+                print_maestro_line(format!(
+                    "DD: tg://proxy?server={host}&port={port}&secret=dd{secret}"
+                ));
            }
            if config.general.modes.tls {
                let mut domains = Vec::with_capacity(1 + config.censorship.tls_domains.len());
@@ -535,18 +571,15 @@ pub(crate) fn print_proxy_links(host: &str, port: u16, config: &ProxyConfig) {

                for domain in domains {
                    let domain_hex = hex::encode(&domain);
-                    info!(
-                        target: "telemt::links",
-                        "  EE-TLS:  tg://proxy?server={}&port={}&secret=ee{}{}",
-                        host, port, secret, domain_hex
-                    );
+                    print_maestro_line(format!(
+                        "EE-TLS: tg://proxy?server={host}&port={port}&secret=ee{secret}{domain_hex}"
+                    ));
                }
            }
        } else {
            warn!(target: "telemt::links", "User '{}' in show_link not found", user_name);
        }
    }
-    info!(target: "telemt::links", "------------------------");
 }

 pub(crate) async fn write_beobachten_snapshot(path: &str, payload: &str) -> std::io::Result<()> {
@@ -6,7 +6,7 @@ use std::time::Duration;
 use tokio::net::TcpListener;
 #[cfg(unix)]
 use tokio::net::UnixListener;
-use tokio::sync::{Semaphore, watch};
+use tokio::sync::{RwLock, Semaphore, watch};
 use tracing::{debug, error, info, warn};

 use crate::config::{ProxyConfig, RstOnCloseMode};
@@ -47,6 +47,10 @@ fn default_link_port(config: &ProxyConfig) -> u16 {
        .unwrap_or(config.server.port)
 }

+fn mss_segment_multiplier(client_mss: u16) -> u16 {
+    1460u16.div_ceil(client_mss)
+}
+
 #[allow(clippy::too_many_arguments)]
 pub(crate) async fn bind_listeners(
    config: &Arc<ProxyConfig>,
@@ -63,6 +67,7 @@ pub(crate) async fn bind_listeners(
    buffer_pool: Arc<BufferPool>,
    rng: Arc<SecureRandom>,
    me_pool: Option<Arc<MePool>>,
+    me_pool_runtime: Arc<RwLock<Option<Arc<MePool>>>>,
    route_runtime: Arc<RouteRuntimeController>,
    tls_cache: Option<Arc<TlsFrontCache>>,
    ip_tracker: Arc<UserIpTracker>,
@@ -89,10 +94,22 @@ pub(crate) async fn bind_listeners(
            warn!(%addr, "Skipping IPv6 listener: IPv6 disabled by [network]");
            continue;
        }
+        let client_mss = match listener_conf.effective_client_mss(&config.server) {
+            Ok(value) => value,
+            Err(error) => {
+                warn!(
+                    %addr,
+                    error = %error,
+                    "Invalid listener client MSS after config validation; using kernel default"
+                );
+                None
+            }
+        };
        let options = ListenOptions {
            reuse_port: listener_conf.reuse_allow,
            ipv6_only: listener_conf.ip.is_ipv6(),
            backlog: config.server.listen_backlog,
+            client_mss,
            ..Default::default()
        };

@@ -100,6 +117,14 @@ pub(crate) async fn bind_listeners(
            Ok(socket) => {
                let listener = TcpListener::from_std(socket.into())?;
                info!("Listening on {}", addr);
+                if let Some(client_mss) = client_mss {
+                    info!(
+                        %addr,
+                        client_mss,
+                        segment_multiplier = mss_segment_multiplier(client_mss),
+                        "Client-facing TCP MSS configured"
+                    );
+                }
                let listener_proxy_protocol = listener_conf
                    .proxy_protocol
                    .unwrap_or(config.server.proxy_protocol);
@@ -236,6 +261,7 @@ pub(crate) async fn bind_listeners(
        let buffer_pool = buffer_pool.clone();
        let rng = rng.clone();
        let me_pool = me_pool.clone();
+        let me_pool_runtime = me_pool_runtime.clone();
        let route_runtime = route_runtime.clone();
        let tls_cache = tls_cache.clone();
        let ip_tracker = ip_tracker.clone();
@@ -298,6 +324,7 @@ pub(crate) async fn bind_listeners(
                        let buffer_pool = buffer_pool.clone();
                        let rng = rng.clone();
                        let me_pool = me_pool.clone();
+                        let me_pool_runtime = me_pool_runtime.clone();
                        let route_runtime = route_runtime.clone();
                        let tls_cache = tls_cache.clone();
                        let ip_tracker = ip_tracker.clone();
@@ -307,7 +334,8 @@ pub(crate) async fn bind_listeners(

                        tokio::spawn(async move {
                            let _permit = permit;
-                            if let Err(e) = crate::proxy::client::handle_client_stream_with_shared(
+                            if let Err(e) =
+                                crate::proxy::client::handle_client_stream_with_shared_and_pool_runtime(
                                stream,
                                fake_peer,
                                config,
@@ -317,6 +345,7 @@ pub(crate) async fn bind_listeners(
                                buffer_pool,
                                rng,
                                me_pool,
+                                Some(me_pool_runtime),
                                route_runtime,
                                tls_cache,
                                ip_tracker,
@@ -367,6 +396,7 @@ pub(crate) fn spawn_tcp_accept_loops(
    buffer_pool: Arc<BufferPool>,
    rng: Arc<SecureRandom>,
    me_pool: Option<Arc<MePool>>,
+    me_pool_runtime: Arc<RwLock<Option<Arc<MePool>>>>,
    route_runtime: Arc<RouteRuntimeController>,
    tls_cache: Option<Arc<TlsFrontCache>>,
    ip_tracker: Arc<UserIpTracker>,
@@ -383,6 +413,7 @@ pub(crate) fn spawn_tcp_accept_loops(
        let buffer_pool = buffer_pool.clone();
        let rng = rng.clone();
        let me_pool = me_pool.clone();
+        let me_pool_runtime = me_pool_runtime.clone();
        let route_runtime = route_runtime.clone();
        let tls_cache = tls_cache.clone();
        let ip_tracker = ip_tracker.clone();
@@ -449,6 +480,7 @@ pub(crate) fn spawn_tcp_accept_loops(
                        let buffer_pool = buffer_pool.clone();
                        let rng = rng.clone();
                        let me_pool = me_pool.clone();
+                        let me_pool_runtime = me_pool_runtime.clone();
                        let route_runtime = route_runtime.clone();
                        let tls_cache = tls_cache.clone();
                        let ip_tracker = ip_tracker.clone();
@@ -470,6 +502,7 @@ pub(crate) fn spawn_tcp_accept_loops(
                                buffer_pool,
                                rng,
                                me_pool,
+                                Some(me_pool_runtime),
                                route_runtime,
                                tls_cache,
                                ip_tracker,
@@ -36,10 +36,10 @@ use crate::network::probe::{decide_network_capabilities, log_probe_result, run_p
 use crate::proxy::route_mode::{RelayRouteMode, RouteRuntimeController};
 use crate::proxy::shared_state::ProxySharedState;
 use crate::startup::{
-    COMPONENT_API_BOOTSTRAP, COMPONENT_CONFIG_LOAD, COMPONENT_ME_POOL_CONSTRUCT,
-    COMPONENT_ME_POOL_INIT_STAGE1, COMPONENT_ME_PROXY_CONFIG_V4, COMPONENT_ME_PROXY_CONFIG_V6,
-    COMPONENT_ME_SECRET_FETCH, COMPONENT_NETWORK_PROBE, COMPONENT_TRACING_INIT, StartupMeStatus,
-    StartupTracker,
+    COMPONENT_API_BOOTSTRAP, COMPONENT_CONFIG_LOAD, COMPONENT_DC_CONNECTIVITY_PING,
+    COMPONENT_ME_CONNECTIVITY_PING, COMPONENT_ME_POOL_CONSTRUCT, COMPONENT_ME_POOL_INIT_STAGE1,
+    COMPONENT_ME_PROXY_CONFIG_V4, COMPONENT_ME_PROXY_CONFIG_V6, COMPONENT_ME_SECRET_FETCH,
+    COMPONENT_NETWORK_PROBE, COMPONENT_TRACING_INIT, StartupMeStatus, StartupTracker,
 };
 use crate::stats::beobachten::BeobachtenStore;
 use crate::stats::telemetry::TelemetryPolicy;
@@ -47,7 +47,10 @@ use crate::stats::{ReplayChecker, Stats};
 use crate::stream::BufferPool;
 use crate::transport::UpstreamManager;
 use crate::transport::middle_proxy::MePool;
-use helpers::{parse_cli, resolve_runtime_base_dir, resolve_runtime_config_path};
+use helpers::{
+    parse_cli, print_maestro_line, resolve_runtime_base_dir, resolve_runtime_config_path,
+    set_maestro_colors_enabled,
+};

 #[cfg(unix)]
 use crate::daemon::{DaemonOptions, PidFile, drop_privileges};
@@ -312,6 +315,7 @@ async fn run_telemt_core(
        eprintln!("[telemt] Invalid network.dns_overrides: {}", e);
        std::process::exit(1);
    }
+    set_maestro_colors_enabled(!config.general.disable_colors);
    startup_tracker
        .complete_component(COMPONENT_CONFIG_LOAD, Some("config is ready".to_string()))
        .await;
@@ -325,7 +329,9 @@ async fn run_telemt_core(
        config.general.log_level.clone()
    };

-    let (filter_layer, filter_handle) = reload::Layer::new(EnvFilter::new("info"));
+    let initial_filter_spec = runtime_tasks::log_filter_spec(has_rust_log, &effective_log_level);
+    let (filter_layer, filter_handle) =
+        reload::Layer::new(EnvFilter::new(initial_filter_spec.clone()));
    startup_tracker
        .start_component(
            COMPONENT_TRACING_INIT,
@@ -356,7 +362,7 @@ async fn run_telemt_core(
                destination: log_destination,
                disable_colors: true,
            };
-            let (_, guard) = crate::logging::init_logging(&logging_opts, "info");
+            let (_, guard) = crate::logging::init_logging(&logging_opts, &initial_filter_spec);
            _logging_guard = Some(guard);
        }
        crate::logging::LogDestination::File { .. } => {
@@ -365,7 +371,7 @@ async fn run_telemt_core(
                destination: log_destination,
                disable_colors: true,
            };
-            let (_, guard) = crate::logging::init_logging(&logging_opts, "info");
+            let (_, guard) = crate::logging::init_logging(&logging_opts, &initial_filter_spec);
            _logging_guard = Some(guard);
        }
    }
@@ -377,7 +383,7 @@ async fn run_telemt_core(
        )
        .await;

-    info!("Telemt MTProxy v{}", env!("CARGO_PKG_VERSION"));
+    print_maestro_line(format!("Telemt MTProxy v{}", env!("CARGO_PKG_VERSION")));
    info!("Log level: {}", effective_log_level);
    if config.general.disable_colors {
        info!("Colors: disabled");
@@ -458,15 +464,22 @@ async fn run_telemt_core(
            config.network.dns_overrides.len()
        );
    }
+    let shared_state = ProxySharedState::new();
+    shared_state.apply_user_enabled_config(&config.access.user_enabled);
+    shared_state.traffic_limiter.apply_policy(
+        config.access.user_rate_limits.clone(),
+        config.access.cidr_rate_limits.clone(),
+    );

    let (api_config_tx, api_config_rx) = watch::channel(Arc::new(config.clone()));
    let (detected_ips_tx, detected_ips_rx) = watch::channel((None::<IpAddr>, None::<IpAddr>));
-    let initial_admission_open = !config.general.use_middle_proxy;
+    let initial_direct_first = config.general.use_middle_proxy && config.general.me2dc_fallback;
+    let initial_admission_open = !config.general.use_middle_proxy || initial_direct_first;
    let (admission_tx, admission_rx) = watch::channel(initial_admission_open);
-    let initial_route_mode = if config.general.use_middle_proxy {
-        RelayRouteMode::Middle
-    } else {
+    let initial_route_mode = if !config.general.use_middle_proxy || initial_direct_first {
        RelayRouteMode::Direct
+    } else {
+        RelayRouteMode::Middle
    };
    let route_runtime = Arc::new(RouteRuntimeController::new(initial_route_mode));
    let api_me_pool = Arc::new(RwLock::new(None::<Arc<MePool>>));
@@ -495,6 +508,7 @@ async fn run_telemt_core(
            let me_pool_api = api_me_pool.clone();
            let upstream_manager_api = upstream_manager.clone();
            let route_runtime_api = route_runtime.clone();
+            let proxy_shared_api = shared_state.clone();
            let config_rx_api = api_config_rx.clone();
            let admission_rx_api = admission_rx.clone();
            let config_path_api = config_path.clone();
@@ -508,6 +522,7 @@ async fn run_telemt_core(
                    ip_tracker_api,
                    me_pool_api,
                    route_runtime_api,
+                    proxy_shared_api,
                    upstream_manager_api,
                    config_rx_api,
                    admission_rx_api,
@@ -602,8 +617,9 @@ async fn run_telemt_core(
    let me_init_retry_attempts = config.general.me_init_retry_attempts;
    if use_middle_proxy && !decision.ipv4_me && !decision.ipv6_me {
        if me2dc_fallback {
-            warn!("No usable IP family for Middle Proxy detected; falling back to direct DC");
-            use_middle_proxy = false;
+            warn!(
+                "No usable IP family for Middle Proxy detected; Direct-DC startup fallback is active while ME init retries continue"
+            );
        } else {
            warn!(
                "No usable IP family for Middle Proxy detected; me2dc_fallback=false, ME init retries stay active"
@@ -665,23 +681,34 @@ async fn run_telemt_core(
    }

    let (me_ready_tx, me_ready_rx) = watch::channel(0_u64);
+    let direct_first_startup = use_middle_proxy && me2dc_fallback;

-    let me_pool: Option<Arc<MePool>> = me_startup::initialize_me_pool(
-        use_middle_proxy,
-        &config,
-        &decision,
-        &probe,
-        &startup_tracker,
-        upstream_manager.clone(),
-        rng.clone(),
-        stats.clone(),
-        api_me_pool.clone(),
-        me_ready_tx.clone(),
-    )
-    .await;
+    let me_pool: Option<Arc<MePool>> = if direct_first_startup {
+        None
+    } else {
+        me_startup::initialize_me_pool(
+            use_middle_proxy,
+            &config,
+            &decision,
+            &probe,
+            &startup_tracker,
+            upstream_manager.clone(),
+            rng.clone(),
+            stats.clone(),
+            api_me_pool.clone(),
+            me_ready_tx.clone(),
+        )
+        .await
+    };

    // If ME failed to initialize, force direct-only mode.
-    if me_pool.is_some() {
+    if direct_first_startup {
+        startup_tracker.set_transport_mode("direct").await;
+        startup_tracker.set_degraded(true).await;
+        info!(
+            "Transport: Direct DC startup fallback active; Middle-End bootstrap continues in background"
+        );
+    } else if me_pool.is_some() {
        startup_tracker.set_transport_mode("middle_proxy").await;
        startup_tracker.set_degraded(false).await;
        info!("Transport: Middle-End Proxy - all DC-over-RPC");
@@ -713,24 +740,34 @@ async fn run_telemt_core(
    ));

    let buffer_pool = Arc::new(BufferPool::with_config(64 * 1024, 4096));
-    let shared_state = ProxySharedState::new();
-    shared_state.traffic_limiter.apply_policy(
-        config.access.user_rate_limits.clone(),
-        config.access.cidr_rate_limits.clone(),
-    );

-    connectivity::run_startup_connectivity(
-        &config,
-        &me_pool,
-        rng.clone(),
-        &startup_tracker,
-        upstream_manager.clone(),
-        prefer_ipv6,
-        &decision,
-        process_started_at,
-        api_me_pool.clone(),
-    )
-    .await;
+    if direct_first_startup {
+        startup_tracker
+            .skip_component(
+                COMPONENT_ME_CONNECTIVITY_PING,
+                Some("deferred by direct-first startup".to_string()),
+            )
+            .await;
+        startup_tracker
+            .skip_component(
+                COMPONENT_DC_CONNECTIVITY_PING,
+                Some("background health checks active".to_string()),
+            )
+            .await;
+    } else {
+        connectivity::run_startup_connectivity(
+            &config,
+            &me_pool,
+            rng.clone(),
+            &startup_tracker,
+            upstream_manager.clone(),
+            prefer_ipv6,
+            &decision,
+            process_started_at,
+            api_me_pool.clone(),
+        )
+        .await;
+    }

    let runtime_watches = runtime_tasks::spawn_runtime_tasks(
        &config,
@@ -758,9 +795,72 @@ async fn run_telemt_core(
    let detected_ip_v4 = runtime_watches.detected_ip_v4;
    let detected_ip_v6 = runtime_watches.detected_ip_v6;

+    if direct_first_startup {
+        let config_bg = config.clone();
+        let decision_bg = decision.clone();
+        let probe_bg = probe.clone();
+        let startup_tracker_bg = startup_tracker.clone();
+        let upstream_manager_bg = upstream_manager.clone();
+        let rng_bg = rng.clone();
+        let stats_bg = stats.clone();
+        let api_me_pool_bg = api_me_pool.clone();
+        let me_ready_tx_bg = me_ready_tx.clone();
+        let config_rx_bg = config_rx.clone();
+        tokio::spawn(async move {
+            let mut bootstrap_attempt: u32 = 0;
+            loop {
+                bootstrap_attempt = bootstrap_attempt.saturating_add(1);
+                let pool = me_startup::initialize_me_pool(
+                    true,
+                    config_bg.as_ref(),
+                    &decision_bg,
+                    &probe_bg,
+                    &startup_tracker_bg,
+                    upstream_manager_bg.clone(),
+                    rng_bg.clone(),
+                    stats_bg.clone(),
+                    api_me_pool_bg.clone(),
+                    me_ready_tx_bg.clone(),
+                )
+                .await;
+                if let Some(pool) = pool {
+                    runtime_tasks::spawn_middle_proxy_runtime_tasks(
+                        config_bg.as_ref(),
+                        config_rx_bg,
+                        pool,
+                        rng_bg,
+                        me_ready_tx_bg,
+                    );
+                    break;
+                }
+                if me_init_retry_attempts > 0 && bootstrap_attempt >= me_init_retry_attempts {
+                    break;
+                }
+                tokio::time::sleep(Duration::from_secs(2)).await;
+            }
+        });
+
+        let startup_tracker_ready = startup_tracker.clone();
+        let api_me_pool_ready = api_me_pool.clone();
+        let mut me_ready_rx_transport = me_ready_tx.subscribe();
+        tokio::spawn(async move {
+            if me_ready_rx_transport.changed().await.is_ok() {
+                if let Some(pool) = api_me_pool_ready.read().await.as_ref() {
+                    pool.set_runtime_ready(true);
+                }
+                startup_tracker_ready
+                    .set_transport_mode("middle_proxy")
+                    .await;
+                startup_tracker_ready.set_degraded(false).await;
+                info!("Transport: Middle-End Proxy restored for new sessions");
+            }
+        });
+    }
+
    admission::configure_admission_gate(
        &config,
        me_pool.clone(),
+        api_me_pool.clone(),
        route_runtime.clone(),
        &admission_tx,
        config_rx.clone(),
@@ -789,6 +889,7 @@ async fn run_telemt_core(
        buffer_pool.clone(),
        rng.clone(),
        me_pool.clone(),
+        api_me_pool.clone(),
        route_runtime.clone(),
        tls_cache.clone(),
        ip_tracker.clone(),
@@ -843,6 +944,7 @@ async fn run_telemt_core(
        buffer_pool.clone(),
        rng.clone(),
        me_pool.clone(),
+        api_me_pool.clone(),
        route_runtime.clone(),
        tls_cache.clone(),
        ip_tracker.clone(),
@@ -3,7 +3,7 @@ use std::path::Path;
 use std::sync::Arc;

 use tokio::sync::{mpsc, watch};
-use tracing::{debug, warn};
+use tracing::{debug, info, warn};
 use tracing_subscriber::EnvFilter;
 use tracing_subscriber::reload;

@@ -234,6 +234,27 @@ pub(crate) async fn spawn_runtime_tasks(
        }
    });

+    let shared_user_enabled = shared_state.clone();
+    let mut config_rx_user_enabled = config_rx.clone();
+    tokio::spawn(async move {
+        loop {
+            if config_rx_user_enabled.changed().await.is_err() {
+                break;
+            }
+            let cfg = config_rx_user_enabled.borrow_and_update().clone();
+            for user in shared_user_enabled.apply_user_enabled_config(&cfg.access.user_enabled) {
+                let cancelled = shared_user_enabled.cancel_user_sessions(&user);
+                if cancelled > 0 {
+                    info!(
+                        user = %user,
+                        cancelled,
+                        "Disabled user sessions cancelled after config reload"
+                    );
+                }
+            }
+        }
+    });
+
    let beobachten_writer = beobachten.clone();
    let config_rx_beobachten = config_rx.clone();
    tokio::spawn(async move {
@@ -257,45 +278,7 @@ pub(crate) async fn spawn_runtime_tasks(
    });

    if let Some(pool) = me_pool {
-        let reinit_trigger_capacity = config.general.me_reinit_trigger_channel.max(1);
-        let (reinit_tx, reinit_rx) = mpsc::channel::<MeReinitTrigger>(reinit_trigger_capacity);
-
-        let pool_clone_sched = pool.clone();
-        let rng_clone_sched = rng.clone();
-        let config_rx_clone_sched = config_rx.clone();
-        let me_ready_tx_sched = me_ready_tx.clone();
-        tokio::spawn(async move {
-            crate::transport::middle_proxy::me_reinit_scheduler(
-                pool_clone_sched,
-                rng_clone_sched,
-                config_rx_clone_sched,
-                reinit_rx,
-                me_ready_tx_sched,
-            )
-            .await;
-        });
-
-        let pool_clone = pool.clone();
-        let config_rx_clone = config_rx.clone();
-        let reinit_tx_updater = reinit_tx.clone();
-        tokio::spawn(async move {
-            crate::transport::middle_proxy::me_config_updater(
-                pool_clone,
-                config_rx_clone,
-                reinit_tx_updater,
-            )
-            .await;
-        });
-
-        let config_rx_clone_rot = config_rx.clone();
-        let reinit_tx_rotation = reinit_tx.clone();
-        tokio::spawn(async move {
-            crate::transport::middle_proxy::me_rotation_task(
-                config_rx_clone_rot,
-                reinit_tx_rotation,
-            )
-            .await;
-        });
+        spawn_middle_proxy_runtime_tasks(config, config_rx.clone(), pool, rng, me_ready_tx);
    }

    RuntimeWatches {
@@ -306,19 +289,58 @@ pub(crate) async fn spawn_runtime_tasks(
    }
 }

+pub(crate) fn spawn_middle_proxy_runtime_tasks(
+    config: &ProxyConfig,
+    config_rx: watch::Receiver<Arc<ProxyConfig>>,
+    pool: Arc<MePool>,
+    rng: Arc<SecureRandom>,
+    me_ready_tx: watch::Sender<u64>,
+) {
+    let reinit_trigger_capacity = config.general.me_reinit_trigger_channel.max(1);
+    let (reinit_tx, reinit_rx) = mpsc::channel::<MeReinitTrigger>(reinit_trigger_capacity);
+
+    let pool_clone_sched = pool.clone();
+    let rng_clone_sched = rng.clone();
+    let config_rx_clone_sched = config_rx.clone();
+    let me_ready_tx_sched = me_ready_tx.clone();
+    tokio::spawn(async move {
+        crate::transport::middle_proxy::me_reinit_scheduler(
+            pool_clone_sched,
+            rng_clone_sched,
+            config_rx_clone_sched,
+            reinit_rx,
+            me_ready_tx_sched,
+        )
+        .await;
+    });
+
+    let pool_clone = pool.clone();
+    let config_rx_clone = config_rx.clone();
+    let reinit_tx_updater = reinit_tx.clone();
+    tokio::spawn(async move {
+        crate::transport::middle_proxy::me_config_updater(
+            pool_clone,
+            config_rx_clone,
+            reinit_tx_updater,
+        )
+        .await;
+    });
+
+    let config_rx_clone_rot = config_rx.clone();
+    let reinit_tx_rotation = reinit_tx.clone();
+    tokio::spawn(async move {
+        crate::transport::middle_proxy::me_rotation_task(config_rx_clone_rot, reinit_tx_rotation)
+            .await;
+    });
+}
+
 pub(crate) async fn apply_runtime_log_filter(
    has_rust_log: bool,
    effective_log_level: &LogLevel,
    filter_handle: reload::Handle<EnvFilter, tracing_subscriber::Registry>,
    mut log_level_rx: watch::Receiver<LogLevel>,
 ) {
-    let runtime_filter = if has_rust_log {
-        EnvFilter::from_default_env()
-    } else if matches!(effective_log_level, LogLevel::Silent) {
-        EnvFilter::new("warn,telemt::links=info")
-    } else {
-        EnvFilter::new(effective_log_level.to_filter_str())
-    };
+    let runtime_filter = EnvFilter::new(log_filter_spec(has_rust_log, effective_log_level));
    filter_handle
        .reload(runtime_filter)
        .expect("Failed to switch log filter");
@@ -329,7 +351,7 @@ pub(crate) async fn apply_runtime_log_filter(
                break;
            }
            let level = log_level_rx.borrow_and_update().clone();
-            let new_filter = tracing_subscriber::EnvFilter::new(level.to_filter_str());
+            let new_filter = tracing_subscriber::EnvFilter::new(log_filter_spec(false, &level));
            if let Err(e) = filter_handle.reload(new_filter) {
                tracing::error!("config reload: failed to update log filter: {}", e);
            }
@@ -337,6 +359,17 @@ pub(crate) async fn apply_runtime_log_filter(
    });
 }

+pub(crate) fn log_filter_spec(has_rust_log: bool, effective_log_level: &LogLevel) -> String {
+    if has_rust_log {
+        std::env::var("RUST_LOG")
+            .unwrap_or_else(|_| effective_log_level.to_filter_str().to_string())
+    } else if matches!(effective_log_level, LogLevel::Silent) {
+        "warn,telemt::links=info".to_string()
+    } else {
+        effective_log_level.to_filter_str().to_string()
+    }
+}
+
 pub(crate) async fn spawn_metrics_if_configured(
    config: &Arc<ProxyConfig>,
    startup_tracker: &Arc<StartupTracker>,
@@ -55,8 +55,10 @@ pub async fn serve(
                return;
            }
        };
-        let is_ipv6 = addr.is_ipv6();
-        match bind_metrics_listener(addr, is_ipv6, listen_backlog) {
+        // Match `server.api.listen`: `[::]:port` is a dual-stack wildcard
+        // on Linux when `net.ipv6.bindv6only=0`.
+        let ipv6_only = addr.is_ipv6() && !addr.ip().is_unspecified();
+        match bind_metrics_listener(addr, ipv6_only, listen_backlog) {
            Ok(listener) => {
                info!("Metrics endpoint: http://{}/metrics and /beobachten", addr);
                serve_listener(
@@ -286,7 +288,7 @@ async fn handle<B>(
    }

    if req.uri().path() == "/beobachten" {
-        let body = render_beobachten(beobachten, config);
+        let body = render_beobachten(stats, beobachten, config);
        let resp = Response::builder()
            .status(StatusCode::OK)
            .header("content-type", "text/plain; charset=utf-8")
@@ -302,13 +304,22 @@ async fn handle<B>(
    Ok(resp)
 }

-fn render_beobachten(beobachten: &BeobachtenStore, config: &ProxyConfig) -> String {
+fn render_beobachten(stats: &Stats, beobachten: &BeobachtenStore, config: &ProxyConfig) -> String {
    if !config.general.beobachten {
        return "beobachten disabled\n".to_string();
    }

    let ttl = Duration::from_secs(config.general.beobachten_minutes.saturating_mul(60));
-    beobachten.snapshot_text(ttl)
+    let mut body = beobachten.snapshot_text(ttl);
+    let tls_text = stats.tls_fingerprint_snapshot_text(ttl, 20);
+    if !tls_text.is_empty() {
+        if !body.ends_with('\n') {
+            body.push('\n');
+        }
+        body.push('\n');
+        body.push_str(&tls_text);
+    }
+    body
 }

 fn tls_front_domains(config: &ProxyConfig) -> Vec<String> {
@@ -726,6 +737,37 @@ async fn render_metrics(
        }
    );

+    let _ = writeln!(
+        out,
+        "# HELP telemt_route_cutover_parked_current Sessions currently parked in route cutover stagger delay"
+    );
+    let _ = writeln!(out, "# TYPE telemt_route_cutover_parked_current gauge");
+    let _ = writeln!(
+        out,
+        "telemt_route_cutover_parked_current{{route=\"direct\"}} {}",
+        stats.get_route_cutover_parked_direct_current()
+    );
+    let _ = writeln!(
+        out,
+        "telemt_route_cutover_parked_current{{route=\"middle\"}} {}",
+        stats.get_route_cutover_parked_middle_current()
+    );
+    let _ = writeln!(
+        out,
+        "# HELP telemt_route_cutover_parked_total Sessions parked in route cutover stagger delay"
+    );
+    let _ = writeln!(out, "# TYPE telemt_route_cutover_parked_total counter");
+    let _ = writeln!(
+        out,
+        "telemt_route_cutover_parked_total{{route=\"direct\"}} {}",
+        stats.get_route_cutover_parked_direct_total()
+    );
+    let _ = writeln!(
+        out,
+        "telemt_route_cutover_parked_total{{route=\"middle\"}} {}",
+        stats.get_route_cutover_parked_middle_total()
+    );
+
    let _ = writeln!(
        out,
        "# HELP telemt_quota_refund_bytes_total Reserved quota bytes returned before commit"
@@ -4,6 +4,7 @@ pub mod constants;
 pub mod frame;
 pub mod obfuscation;
 pub mod tls;
+pub mod tls_fingerprint;

 #[allow(unused_imports)]
 pub use constants::*;
@@ -13,3 +14,5 @@ pub use frame::*;
 pub use obfuscation::*;
 #[allow(unused_imports)]
 pub use tls::*;
+#[allow(unused_imports)]
+pub use tls_fingerprint::*;
@@ -1385,6 +1385,7 @@ fn emulated_server_hello_never_places_alpn_in_server_hello_extensions() {
        false,
        true,
        ClientHelloTlsVersion::Tls13,
+        [0x13, 0x01],
        &rng,
        Some(b"h2".to_vec()),
        0,
@@ -1509,12 +1510,22 @@ fn test_validate_tls_handshake_format() {
 }

 fn build_client_hello_with_exts(exts: Vec<(u16, Vec<u8>)>, host: &str) -> Vec<u8> {
+    build_client_hello_with_ciphers_and_exts(&[[0x13, 0x01]], exts, host)
+}
+
+fn build_client_hello_with_ciphers_and_exts(
+    cipher_suites: &[[u8; 2]],
+    exts: Vec<(u16, Vec<u8>)>,
+    host: &str,
+) -> Vec<u8> {
    let mut body = Vec::new();
    body.extend_from_slice(&TLS_VERSION);
    body.extend_from_slice(&[0u8; 32]);
    body.push(0);
-    body.extend_from_slice(&2u16.to_be_bytes());
-    body.extend_from_slice(&[0x13, 0x01]);
+    body.extend_from_slice(&((cipher_suites.len() * 2) as u16).to_be_bytes());
+    for suite in cipher_suites {
+        body.extend_from_slice(suite);
+    }
    body.push(1);
    body.push(0);

@@ -1654,6 +1665,52 @@ fn detect_client_hello_tls_version_rejects_malformed_supported_versions() {
    assert!(detect_client_hello_tls_version(&ch).is_none());
 }

+#[test]
+fn select_server_hello_cipher_suite_keeps_profile_cipher_when_offered() {
+    let ch = build_client_hello_with_ciphers_and_exts(
+        &[[0x13, 0x01], [0x13, 0x03]],
+        Vec::new(),
+        "example.com",
+    );
+    assert_eq!(
+        select_server_hello_cipher_suite(&ch, [0x13, 0x03]),
+        [0x13, 0x03]
+    );
+}
+
+#[test]
+fn select_server_hello_cipher_suite_ignores_profile_tls12_cipher() {
+    let ch = build_client_hello_with_ciphers_and_exts(
+        &[[0xc0, 0x2f], [0x13, 0x03]],
+        Vec::new(),
+        "example.com",
+    );
+    assert_eq!(
+        select_server_hello_cipher_suite(&ch, [0xc0, 0x2f]),
+        [0x13, 0x03]
+    );
+}
+
+#[test]
+fn select_server_hello_cipher_suite_falls_back_to_offered_tls13_suite() {
+    let ch = build_client_hello_with_ciphers_and_exts(&[[0x13, 0x03]], Vec::new(), "example.com");
+    assert_eq!(
+        select_server_hello_cipher_suite(&ch, [0x13, 0x01]),
+        [0x13, 0x03]
+    );
+}
+
+#[test]
+fn select_server_hello_cipher_suite_keeps_preferred_for_malformed_clienthello() {
+    let mut ch =
+        build_client_hello_with_ciphers_and_exts(&[[0x13, 0x03]], Vec::new(), "example.com");
+    ch.truncate(12);
+    assert_eq!(
+        select_server_hello_cipher_suite(&ch, [0x13, 0x01]),
+        [0x13, 0x01]
+    );
+}
+
 #[test]
 fn extract_sni_rejects_zero_length_host_name() {
    let mut sni_ext = Vec::new();
@@ -2179,7 +2236,7 @@ fn light_fuzz_boot_time_timestamp_matrix_with_short_replay_window_obeys_boot_cap
 }

 #[test]
-fn server_hello_application_data_contains_alpn_marker_when_selected() {
+fn server_hello_application_data_omits_alpn_marker_when_selected() {
    let secret = b"alpn_marker_test";
    let client_digest = [0x55u8; TLS_DIGEST_LEN];
    let session_id = vec![0xAB; 32];
@@ -2206,8 +2263,8 @@ fn server_hello_application_data_contains_alpn_marker_when_selected() {
    assert!(
        app_payload
            .windows(expected.len())
-            .any(|window| window == expected),
-        "first application payload must carry ALPN marker for selected protocol"
+            .all(|window| window != expected),
+        "first application payload must not expose plaintext ALPN marker bytes"
    );
 }

@@ -2303,14 +2360,14 @@ fn server_hello_ignores_oversized_alpn_when_marker_would_not_fit() {
 }

 #[test]
-fn server_hello_embeds_full_alpn_marker_when_it_exactly_fits_fake_cert_len() {
+fn server_hello_omits_alpn_marker_even_when_it_would_fit_fake_cert_len() {
    let secret = b"alpn_exact_fit_test";
    let client_digest = [0x58u8; TLS_DIGEST_LEN];
    let session_id = vec![0xA5; 32];
    let rng = crate::crypto::SecureRandom::new();
    let proto = vec![b'z'; 57];

-    // marker_len = 4 + (2 + (1 + proto_len)) = 7 + proto_len = 64
+    // marker_len = 4 + (2 + (1 + proto_len)) = 7 + proto_len = 64.
    let response = build_server_hello(
        secret,
        &client_digest,
@@ -2336,7 +2393,7 @@ fn server_hello_embeds_full_alpn_marker_when_it_exactly_fits_fake_cert_len() {
    expected_marker.extend_from_slice(&proto);

    assert_eq!(app_payload.len(), expected_marker.len());
-    assert_eq!(app_payload, expected_marker.as_slice());
+    assert_ne!(app_payload, expected_marker.as_slice());
 }

 #[test]
@@ -105,6 +105,8 @@ mod extension_type {
 /// TLS Cipher Suites
 mod cipher_suite {
    pub const TLS_AES_128_GCM_SHA256: [u8; 2] = [0x13, 0x01];
+    pub const TLS_AES_256_GCM_SHA384: [u8; 2] = [0x13, 0x02];
+    pub const TLS_CHACHA20_POLY1305_SHA256: [u8; 2] = [0x13, 0x03];
 }

 /// TLS Named Curves
@@ -241,6 +243,13 @@ impl ServerHelloBuilder {
        self
    }

+    fn with_cipher_suite(mut self, cipher_suite: [u8; 2]) -> Self {
+        if cipher_suite != [0, 0] {
+            self.cipher_suite = cipher_suite;
+        }
+        self
+    }
+
    /// Build ServerHello message (without record header)
    fn build_message(&self) -> Vec<u8> {
        let Ok(session_id_len) = u8::try_from(self.session_id.len()) else {
@@ -520,6 +529,33 @@ pub fn build_server_hello(
    rng: &SecureRandom,
    alpn: Option<Vec<u8>>,
    new_session_tickets: u8,
+) -> Vec<u8> {
+    build_server_hello_with_cipher(
+        secret,
+        client_digest,
+        session_id,
+        fake_cert_len,
+        rng,
+        cipher_suite::TLS_AES_128_GCM_SHA256,
+        alpn,
+        new_session_tickets,
+    )
+}
+
+/// Build TLS ServerHello response with a caller-selected cipher suite.
+///
+/// The caller is responsible for selecting a suite that is compatible with the
+/// already-authenticated ClientHello. Keeping the selection outside this
+/// builder avoids extra ClientHello parsing in the response construction path.
+pub(crate) fn build_server_hello_with_cipher(
+    secret: &[u8],
+    client_digest: &[u8; TLS_DIGEST_LEN],
+    session_id: &[u8],
+    fake_cert_len: usize,
+    rng: &SecureRandom,
+    selected_cipher_suite: [u8; 2],
+    alpn: Option<Vec<u8>>,
+    new_session_tickets: u8,
 ) -> Vec<u8> {
    const MIN_APP_DATA: usize = 64;
    const MAX_APP_DATA: usize = MAX_TLS_CIPHERTEXT_SIZE;
@@ -528,6 +564,7 @@ pub fn build_server_hello(

    // Build ServerHello
    let server_hello = ServerHelloBuilder::new(session_id.to_vec())
+        .with_cipher_suite(selected_cipher_suite)
        .with_x25519_key(&x25519_key)
        .with_tls13_version()
        .build_record();
@@ -538,28 +575,14 @@ pub fn build_server_hello(
        TLS_VERSION[0],
        TLS_VERSION[1],
        0x00,
-        0x01, // length = 1
-        0x01, // CCS byte
+        0x01,
+        0x01,
    ];

    // Build first encrypted flight mimic as opaque ApplicationData bytes.
-    // Embed a compact EncryptedExtensions-like ALPN block when selected.
+    // ALPN belongs inside encrypted EncryptedExtensions in real TLS 1.3.
    let mut fake_cert = Vec::with_capacity(fake_cert_len);
-    if let Some(proto) = alpn
-        .as_ref()
-        .filter(|p| !p.is_empty() && p.len() <= u8::MAX as usize)
-    {
-        let proto_list_len = 1usize + proto.len();
-        let ext_data_len = 2usize + proto_list_len;
-        let marker_len = 4usize + ext_data_len;
-        if marker_len <= fake_cert_len {
-            fake_cert.extend_from_slice(&0x0010u16.to_be_bytes());
-            fake_cert.extend_from_slice(&(ext_data_len as u16).to_be_bytes());
-            fake_cert.extend_from_slice(&(proto_list_len as u16).to_be_bytes());
-            fake_cert.push(proto.len() as u8);
-            fake_cert.extend_from_slice(proto);
-        }
-    }
+    let _ = alpn;
    if fake_cert.len() < fake_cert_len {
        fake_cert.extend_from_slice(&rng.bytes(fake_cert_len - fake_cert.len()));
    } else if fake_cert.len() > fake_cert_len {
@@ -580,7 +603,7 @@ pub fn build_server_hello(
    let ticket_count = new_session_tickets.min(4);
    if ticket_count > 0 {
        for _ in 0..ticket_count {
-            let ticket_len: usize = rng.range(48) + 48; // 48-95 bytes
+            let ticket_len: usize = rng.range(48) + 48;
            let mut record = Vec::with_capacity(5 + ticket_len);
            record.push(TLS_RECORD_APPLICATION);
            record.extend_from_slice(&TLS_VERSION);
@@ -927,6 +950,112 @@ pub fn detect_client_hello_tls_version(handshake: &[u8]) -> Option<ClientHelloTl
    }
 }

+fn client_hello_cipher_suites_range(handshake: &[u8]) -> Option<(usize, usize)> {
+    if handshake.len() < 5 || handshake[0] != TLS_RECORD_HANDSHAKE {
+        return None;
+    }
+
+    let record_len = u16::from_be_bytes([handshake[3], handshake[4]]) as usize;
+    let record_end = 5usize.checked_add(record_len)?;
+    if record_end > handshake.len() {
+        return None;
+    }
+
+    let mut pos = 5;
+    if handshake.get(pos) != Some(&0x01) {
+        return None;
+    }
+    pos += 1;
+
+    if pos + 3 > record_end {
+        return None;
+    }
+    let handshake_len = ((handshake[pos] as usize) << 16)
+        | ((handshake[pos + 1] as usize) << 8)
+        | handshake[pos + 2] as usize;
+    pos += 3;
+    let handshake_end = pos.checked_add(handshake_len)?;
+    if handshake_end > record_end {
+        return None;
+    }
+
+    if pos + 2 + 32 > handshake_end {
+        return None;
+    }
+    pos += 2 + 32;
+
+    let session_id_len = *handshake.get(pos)? as usize;
+    pos = pos.checked_add(1)?.checked_add(session_id_len)?;
+    if pos + 2 > handshake_end {
+        return None;
+    }
+
+    let cipher_len = u16::from_be_bytes([handshake[pos], handshake[pos + 1]]) as usize;
+    if cipher_len == 0 || cipher_len % 2 != 0 {
+        return None;
+    }
+    pos += 2;
+    let cipher_end = pos.checked_add(cipher_len)?;
+    if cipher_end > handshake_end {
+        return None;
+    }
+
+    Some((pos, cipher_end))
+}
+
+fn client_hello_offers_cipher_suite(
+    handshake: &[u8],
+    range: (usize, usize),
+    suite: [u8; 2],
+) -> bool {
+    let mut pos = range.0;
+    while pos + 1 < range.1 {
+        if handshake[pos] == suite[0] && handshake[pos + 1] == suite[1] {
+            return true;
+        }
+        pos += 2;
+    }
+    false
+}
+
+fn is_tls13_cipher_suite(suite: [u8; 2]) -> bool {
+    suite == cipher_suite::TLS_AES_128_GCM_SHA256
+        || suite == cipher_suite::TLS_AES_256_GCM_SHA384
+        || suite == cipher_suite::TLS_CHACHA20_POLY1305_SHA256
+}
+
+/// Select the ServerHello cipher suite from the already-received ClientHello.
+///
+/// This is intentionally a borrowed, zero-allocation scan. It runs only for an
+/// authenticated success response and keeps malformed or unexpected ClientHello
+/// shapes on the previous fallback behavior.
+pub(crate) fn select_server_hello_cipher_suite(handshake: &[u8], preferred: [u8; 2]) -> [u8; 2] {
+    let preferred = if is_tls13_cipher_suite(preferred) {
+        preferred
+    } else {
+        cipher_suite::TLS_AES_128_GCM_SHA256
+    };
+    let Some(range) = client_hello_cipher_suites_range(handshake) else {
+        return preferred;
+    };
+
+    if client_hello_offers_cipher_suite(handshake, range, preferred) {
+        return preferred;
+    }
+
+    for fallback in [
+        cipher_suite::TLS_AES_128_GCM_SHA256,
+        cipher_suite::TLS_CHACHA20_POLY1305_SHA256,
+        cipher_suite::TLS_AES_256_GCM_SHA384,
+    ] {
+        if client_hello_offers_cipher_suite(handshake, range, fallback) {
+            return fallback;
+        }
+    }
+
+    preferred
+}
+
 /// Check if bytes look like a TLS ClientHello
 pub fn is_tls_handshake(first_bytes: &[u8]) -> bool {
    if first_bytes.len() < 3 {
@@ -0,0 +1,450 @@
+//! Passive JA3 / JA4 TLS ClientHello fingerprinting.
+
+use crate::crypto::hash::md5;
+use crate::crypto::sha256;
+use crate::protocol::constants::TLS_RECORD_HANDSHAKE;
+
+const EXT_SNI: u16 = 0x0000;
+const EXT_SUPPORTED_GROUPS: u16 = 0x000a;
+const EXT_EC_POINT_FORMATS: u16 = 0x000b;
+const EXT_SIGNATURE_ALGORITHMS: u16 = 0x000d;
+const EXT_ALPN: u16 = 0x0010;
+const EXT_SUPPORTED_VERSIONS: u16 = 0x002b;
+
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct TlsClientFingerprint {
+    pub ja3: String,
+    pub ja3_raw: String,
+    pub ja4: String,
+    pub ja4_raw: String,
+}
+
+#[derive(Default)]
+struct ParsedClientHello {
+    legacy_version: u16,
+    ciphers: Vec<u16>,
+    extensions: Vec<u16>,
+    supported_groups: Vec<u16>,
+    ec_point_formats: Vec<u8>,
+    signature_algorithms: Vec<u16>,
+    supported_versions: Vec<u16>,
+    alpn_first: Option<Vec<u8>>,
+    sni_present: bool,
+}
+
+pub fn fingerprint_client_hello(handshake: &[u8]) -> Option<TlsClientFingerprint> {
+    let parsed = parse_client_hello(handshake)?;
+    let ja3_raw = ja3_raw(&parsed);
+    let ja3 = hex::encode(md5(ja3_raw.as_bytes()));
+    let (ja4, ja4_raw) = ja4(&parsed);
+
+    Some(TlsClientFingerprint {
+        ja3,
+        ja3_raw,
+        ja4,
+        ja4_raw,
+    })
+}
+
+fn parse_client_hello(handshake: &[u8]) -> Option<ParsedClientHello> {
+    if handshake.len() < 5 || handshake[0] != TLS_RECORD_HANDSHAKE {
+        return None;
+    }
+
+    let record_len = read_u16_at(handshake, 3)? as usize;
+    let record_end = 5usize.checked_add(record_len)?;
+    if record_end > handshake.len() {
+        return None;
+    }
+
+    let mut pos = 5usize;
+    if *handshake.get(pos)? != 0x01 {
+        return None;
+    }
+    pos = pos.checked_add(1)?;
+
+    if pos + 3 > record_end {
+        return None;
+    }
+    let handshake_len = ((usize::from(handshake[pos])) << 16)
+        | ((usize::from(handshake[pos + 1])) << 8)
+        | usize::from(handshake[pos + 2]);
+    pos = pos.checked_add(3)?;
+    let handshake_end = pos.checked_add(handshake_len)?;
+    if handshake_end > record_end {
+        return None;
+    }
+
+    if pos + 2 + 32 > handshake_end {
+        return None;
+    }
+    let legacy_version = read_u16_at(handshake, pos)?;
+    pos = pos.checked_add(2 + 32)?;
+
+    let session_id_len = usize::from(*handshake.get(pos)?);
+    pos = pos.checked_add(1)?.checked_add(session_id_len)?;
+    if pos + 2 > handshake_end {
+        return None;
+    }
+
+    let cipher_len = read_u16_at(handshake, pos)? as usize;
+    pos = pos.checked_add(2)?;
+    let cipher_end = pos.checked_add(cipher_len)?;
+    if cipher_end > handshake_end || cipher_len % 2 != 0 {
+        return None;
+    }
+    let mut ciphers = Vec::with_capacity(cipher_len / 2);
+    while pos + 1 < cipher_end {
+        let value = read_u16_at(handshake, pos)?;
+        if !is_grease(value) {
+            ciphers.push(value);
+        }
+        pos = pos.checked_add(2)?;
+    }
+
+    let comp_len = usize::from(*handshake.get(pos)?);
+    pos = pos.checked_add(1)?.checked_add(comp_len)?;
+    if pos > handshake_end {
+        return None;
+    }
+
+    let mut parsed = ParsedClientHello {
+        legacy_version,
+        ciphers,
+        ..ParsedClientHello::default()
+    };
+
+    if pos == handshake_end {
+        return Some(parsed);
+    }
+    if pos + 2 > handshake_end {
+        return None;
+    }
+
+    let ext_len = read_u16_at(handshake, pos)? as usize;
+    pos = pos.checked_add(2)?;
+    let ext_end = pos.checked_add(ext_len)?;
+    if ext_end > handshake_end {
+        return None;
+    }
+
+    while pos + 4 <= ext_end {
+        let etype = read_u16_at(handshake, pos)?;
+        let elen = read_u16_at(handshake, pos + 2)? as usize;
+        pos = pos.checked_add(4)?;
+        let data_end = pos.checked_add(elen)?;
+        if data_end > ext_end {
+            return None;
+        }
+        let data = handshake.get(pos..data_end)?;
+
+        if !is_grease(etype) {
+            parsed.extensions.push(etype);
+            match etype {
+                EXT_SNI => parsed.sni_present = true,
+                EXT_SUPPORTED_GROUPS => {
+                    parsed.supported_groups = parse_u16_vector(data, 2)?;
+                }
+                EXT_EC_POINT_FORMATS => {
+                    parsed.ec_point_formats = parse_u8_vector(data)?;
+                }
+                EXT_SIGNATURE_ALGORITHMS => {
+                    parsed.signature_algorithms = parse_u16_vector(data, 2)?;
+                }
+                EXT_ALPN => {
+                    parsed.alpn_first = parse_alpn_first(data)?;
+                }
+                EXT_SUPPORTED_VERSIONS => {
+                    parsed.supported_versions = parse_u16_vector(data, 1)?;
+                }
+                _ => {}
+            }
+        }
+
+        pos = data_end;
+    }
+
+    if pos != ext_end {
+        return None;
+    }
+
+    Some(parsed)
+}
+
+fn parse_u16_vector(data: &[u8], len_prefix_len: usize) -> Option<Vec<u16>> {
+    let (list_len, mut pos) = match len_prefix_len {
+        1 => (usize::from(*data.first()?), 1usize),
+        2 => (read_u16_at(data, 0)? as usize, 2usize),
+        _ => return None,
+    };
+    let list_end = pos.checked_add(list_len)?;
+    if list_end > data.len() || list_len % 2 != 0 {
+        return None;
+    }
+
+    let mut out = Vec::with_capacity(list_len / 2);
+    while pos + 1 < list_end {
+        let value = read_u16_at(data, pos)?;
+        if !is_grease(value) {
+            out.push(value);
+        }
+        pos = pos.checked_add(2)?;
+    }
+    Some(out)
+}
+
+fn parse_u8_vector(data: &[u8]) -> Option<Vec<u8>> {
+    let list_len = usize::from(*data.first()?);
+    let list_start = 1usize;
+    let list_end = list_start.checked_add(list_len)?;
+    if list_end > data.len() {
+        return None;
+    }
+    Some(data.get(list_start..list_end)?.to_vec())
+}
+
+fn parse_alpn_first(data: &[u8]) -> Option<Option<Vec<u8>>> {
+    if data.len() < 2 {
+        return None;
+    }
+    let list_len = read_u16_at(data, 0)? as usize;
+    let mut pos = 2usize;
+    let list_end = pos.checked_add(list_len)?;
+    if list_end > data.len() {
+        return None;
+    }
+    if pos == list_end {
+        return Some(None);
+    }
+
+    let protocol_len = usize::from(*data.get(pos)?);
+    pos = pos.checked_add(1)?;
+    let protocol_end = pos.checked_add(protocol_len)?;
+    if protocol_end > list_end {
+        return None;
+    }
+    if protocol_len == 0 {
+        return Some(None);
+    }
+    Some(Some(data.get(pos..protocol_end)?.to_vec()))
+}
+
+fn ja3_raw(parsed: &ParsedClientHello) -> String {
+    format!(
+        "{},{},{},{},{}",
+        parsed.legacy_version,
+        join_decimal_u16(&parsed.ciphers),
+        join_decimal_u16(&parsed.extensions),
+        join_decimal_u16(&parsed.supported_groups),
+        join_decimal_u8(&parsed.ec_point_formats)
+    )
+}
+
+fn ja4(parsed: &ParsedClientHello) -> (String, String) {
+    let a = format!(
+        "t{}{}{:02}{:02}{}",
+        ja4_version_code(parsed),
+        if parsed.sni_present { "d" } else { "i" },
+        count_ja4(parsed.ciphers.len()),
+        count_ja4(parsed.extensions.len()),
+        ja4_alpn_marker(parsed.alpn_first.as_deref())
+    );
+
+    let mut ciphers = parsed.ciphers.clone();
+    ciphers.sort_unstable();
+    let cipher_raw = join_hex_u16(&ciphers);
+    let cipher_hash = if ciphers.is_empty() {
+        "000000000000".to_string()
+    } else {
+        sha256_truncated_12(&cipher_raw)
+    };
+
+    let mut extensions_for_hash = parsed
+        .extensions
+        .iter()
+        .copied()
+        .filter(|value| *value != EXT_SNI && *value != EXT_ALPN)
+        .collect::<Vec<_>>();
+    extensions_for_hash.sort_unstable();
+    let extension_raw = join_hex_u16(&extensions_for_hash);
+    let signature_raw = join_hex_u16(&parsed.signature_algorithms);
+    let extension_hash_input = if signature_raw.is_empty() {
+        extension_raw.clone()
+    } else {
+        format!("{extension_raw}_{signature_raw}")
+    };
+    let extension_hash = if extensions_for_hash.is_empty() {
+        "000000000000".to_string()
+    } else {
+        sha256_truncated_12(&extension_hash_input)
+    };
+
+    (
+        format!("{a}_{cipher_hash}_{extension_hash}"),
+        format!("{a}_{cipher_raw}_{extension_hash_input}"),
+    )
+}
+
+fn ja4_version_code(parsed: &ParsedClientHello) -> &'static str {
+    let version = parsed
+        .supported_versions
+        .iter()
+        .copied()
+        .max()
+        .unwrap_or(parsed.legacy_version);
+    match version {
+        0x0304 => "13",
+        0x0303 => "12",
+        0x0302 => "11",
+        0x0301 => "10",
+        0x0300 => "s3",
+        0x0002 => "s2",
+        0xfeff => "d1",
+        0xfefd => "d2",
+        0xfefc => "d3",
+        _ => "00",
+    }
+}
+
+fn ja4_alpn_marker(alpn_first: Option<&[u8]>) -> String {
+    let Some(value) = alpn_first else {
+        return "00".to_string();
+    };
+    let Some(first) = value.first().copied() else {
+        return "00".to_string();
+    };
+    let last = value.last().copied().unwrap_or(first);
+    if first.is_ascii_alphanumeric() && last.is_ascii_alphanumeric() {
+        return format!("{}{}", first as char, last as char);
+    }
+
+    let encoded = hex::encode(value);
+    if encoded.is_empty() {
+        return "00".to_string();
+    }
+    let first_hex = encoded.as_bytes()[0] as char;
+    let last_hex = encoded.as_bytes()[encoded.len().saturating_sub(1)] as char;
+    format!("{first_hex}{last_hex}")
+}
+
+fn count_ja4(count: usize) -> usize {
+    count.min(99)
+}
+
+fn sha256_truncated_12(input: &str) -> String {
+    let mut encoded = hex::encode(sha256(input.as_bytes()));
+    encoded.truncate(12);
+    encoded
+}
+
+fn join_decimal_u16(values: &[u16]) -> String {
+    values
+        .iter()
+        .map(u16::to_string)
+        .collect::<Vec<_>>()
+        .join("-")
+}
+
+fn join_decimal_u8(values: &[u8]) -> String {
+    values
+        .iter()
+        .map(u8::to_string)
+        .collect::<Vec<_>>()
+        .join("-")
+}
+
+fn join_hex_u16(values: &[u16]) -> String {
+    values
+        .iter()
+        .map(|value| format!("{value:04x}"))
+        .collect::<Vec<_>>()
+        .join(",")
+}
+
+fn read_u16_at(buf: &[u8], pos: usize) -> Option<u16> {
+    Some(u16::from_be_bytes([
+        *buf.get(pos)?,
+        *buf.get(pos.checked_add(1)?)?,
+    ]))
+}
+
+fn is_grease(value: u16) -> bool {
+    let high = (value >> 8) as u8;
+    let low = value as u8;
+    high == low && (high & 0x0f) == 0x0a
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn sample_client_hello() -> Vec<u8> {
+        let mut body = Vec::new();
+        body.extend_from_slice(&[0x03, 0x03]);
+        body.extend_from_slice(&[0x11; 32]);
+        body.push(0);
+        body.extend_from_slice(&10u16.to_be_bytes());
+        body.extend_from_slice(&[0x0a, 0x0a, 0x13, 0x01, 0x13, 0x02, 0xc0, 0x2f, 0x00, 0xff]);
+        body.push(1);
+        body.push(0);
+
+        let mut extensions = Vec::new();
+        append_ext(&mut extensions, EXT_SNI, &[0, 0]);
+        append_ext(&mut extensions, EXT_ALPN, &[0, 3, 2, b'h', b'2']);
+        append_ext(
+            &mut extensions,
+            EXT_SUPPORTED_GROUPS,
+            &[0, 6, 0x0a, 0x0a, 0x00, 0x17, 0x00, 0x1d],
+        );
+        append_ext(&mut extensions, EXT_EC_POINT_FORMATS, &[1, 0]);
+        append_ext(
+            &mut extensions,
+            EXT_SIGNATURE_ALGORITHMS,
+            &[0, 4, 0x04, 0x03, 0x08, 0x04],
+        );
+        append_ext(
+            &mut extensions,
+            EXT_SUPPORTED_VERSIONS,
+            &[4, 0x03, 0x04, 0x03, 0x03],
+        );
+        body.extend_from_slice(&(extensions.len() as u16).to_be_bytes());
+        body.extend_from_slice(&extensions);
+
+        let mut record = Vec::new();
+        record.push(TLS_RECORD_HANDSHAKE);
+        record.extend_from_slice(&[0x03, 0x01]);
+        record.extend_from_slice(&((body.len() + 4) as u16).to_be_bytes());
+        record.push(0x01);
+        record.extend_from_slice(&[
+            ((body.len() >> 16) & 0xff) as u8,
+            ((body.len() >> 8) & 0xff) as u8,
+            (body.len() & 0xff) as u8,
+        ]);
+        record.extend_from_slice(&body);
+        record
+    }
+
+    fn append_ext(out: &mut Vec<u8>, etype: u16, data: &[u8]) {
+        out.extend_from_slice(&etype.to_be_bytes());
+        out.extend_from_slice(&(data.len() as u16).to_be_bytes());
+        out.extend_from_slice(data);
+    }
+
+    #[test]
+    fn ja3_and_ja4_ignore_grease_and_remain_stable() {
+        let fp = fingerprint_client_hello(&sample_client_hello())
+            .expect("sample ClientHello must fingerprint");
+        assert_eq!(
+            fp.ja3_raw,
+            "771,4865-4866-49199-255,0-16-10-11-13-43,23-29,0"
+        );
+        assert!(fp.ja4.starts_with("t13d0406h2_"));
+    }
+
+    #[test]
+    fn malformed_client_hello_returns_none() {
+        let mut hello = sample_client_hello();
+        hello.truncate(12);
+        assert!(fingerprint_client_hello(&hello).is_none());
+    }
+}
@@ -11,6 +11,7 @@ use std::sync::atomic::{AtomicBool, Ordering};
 use std::time::Duration;
 use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite};
 use tokio::net::TcpStream;
+use tokio::sync::RwLock;
 use tokio::time::timeout;
 use tracing::{debug, warn};

@@ -97,6 +98,7 @@ use crate::error::{HandshakeResult, ProxyError, Result, StreamError};
 use crate::ip_tracker::UserIpTracker;
 use crate::protocol::constants::*;
 use crate::protocol::tls;
+use crate::protocol::tls_fingerprint::{self, TlsClientFingerprint};
 use crate::stats::beobachten::BeobachtenStore;
 use crate::stats::{ReplayChecker, Stats};
 use crate::stream::{BufferPool, CryptoReader, CryptoWriter};
@@ -349,6 +351,60 @@ fn record_beobachten_class(
    beobachten.record(class, peer_ip, beobachten_ttl(config));
 }

+fn tls_fingerprint_collection_enabled(config: &ProxyConfig) -> bool {
+    config.general.beobachten || config.server.api.runtime_edge_enabled
+}
+
+fn observe_tls_client_fingerprint(
+    stats: &Stats,
+    config: &ProxyConfig,
+    peer_ip: IpAddr,
+    handshake: &[u8],
+) -> Option<TlsClientFingerprint> {
+    if !tls_fingerprint_collection_enabled(config) {
+        return None;
+    }
+
+    match tls_fingerprint::fingerprint_client_hello(handshake) {
+        Some(fingerprint) => {
+            stats.record_tls_fingerprint_observed(&fingerprint, peer_ip, beobachten_ttl(config));
+            Some(fingerprint)
+        }
+        None => {
+            stats.increment_tls_fingerprint_parse_error();
+            None
+        }
+    }
+}
+
+fn record_tls_fingerprint_auth_success(
+    stats: &Stats,
+    config: &ProxyConfig,
+    peer_ip: IpAddr,
+    fingerprint: Option<&TlsClientFingerprint>,
+    user: &str,
+) {
+    if let Some(fingerprint) = fingerprint {
+        stats.record_tls_fingerprint_auth_success(
+            fingerprint,
+            peer_ip,
+            user,
+            beobachten_ttl(config),
+        );
+    }
+}
+
+fn record_tls_fingerprint_bad_or_probe(
+    stats: &Stats,
+    config: &ProxyConfig,
+    peer_ip: IpAddr,
+    fingerprint: Option<&TlsClientFingerprint>,
+) {
+    if let Some(fingerprint) = fingerprint {
+        stats.record_tls_fingerprint_bad_or_probe(fingerprint, peer_ip, beobachten_ttl(config));
+    }
+}
+
 fn classify_expected_64_got_0(kind: std::io::ErrorKind) -> Option<&'static str> {
    match kind {
        std::io::ErrorKind::UnexpectedEof => Some("expected_64_got_0_unexpected_eof"),
@@ -452,7 +508,50 @@ where
 }

 #[allow(clippy::too_many_arguments)]
+#[allow(dead_code)]
 pub async fn handle_client_stream_with_shared<S>(
+    stream: S,
+    peer: SocketAddr,
+    config: Arc<ProxyConfig>,
+    stats: Arc<Stats>,
+    upstream_manager: Arc<UpstreamManager>,
+    replay_checker: Arc<ReplayChecker>,
+    buffer_pool: Arc<BufferPool>,
+    rng: Arc<SecureRandom>,
+    me_pool: Option<Arc<MePool>>,
+    route_runtime: Arc<RouteRuntimeController>,
+    tls_cache: Option<Arc<TlsFrontCache>>,
+    ip_tracker: Arc<UserIpTracker>,
+    beobachten: Arc<BeobachtenStore>,
+    shared: Arc<ProxySharedState>,
+    proxy_protocol_enabled: bool,
+) -> Result<()>
+where
+    S: AsyncRead + AsyncWrite + Unpin + Send + 'static,
+{
+    handle_client_stream_with_shared_and_pool_runtime(
+        stream,
+        peer,
+        config,
+        stats,
+        upstream_manager,
+        replay_checker,
+        buffer_pool,
+        rng,
+        me_pool,
+        None,
+        route_runtime,
+        tls_cache,
+        ip_tracker,
+        beobachten,
+        shared,
+        proxy_protocol_enabled,
+    )
+    .await
+}
+
+#[allow(clippy::too_many_arguments)]
+pub async fn handle_client_stream_with_shared_and_pool_runtime<S>(
    mut stream: S,
    peer: SocketAddr,
    config: Arc<ProxyConfig>,
@@ -462,6 +561,7 @@ pub async fn handle_client_stream_with_shared<S>(
    buffer_pool: Arc<BufferPool>,
    rng: Arc<SecureRandom>,
    me_pool: Option<Arc<MePool>>,
+    me_pool_runtime: Option<Arc<RwLock<Option<Arc<MePool>>>>>,
    route_runtime: Arc<RouteRuntimeController>,
    tls_cache: Option<Arc<TlsFrontCache>>,
    ip_tracker: Arc<UserIpTracker>,
@@ -660,6 +760,9 @@ where
                ));
            }

+            let tls_fingerprint =
+                observe_tls_client_fingerprint(stats.as_ref(), &config, real_peer.ip(), &handshake);
+
            let (read_half, write_half) = tokio::io::split(stream);

            let (mut tls_reader, tls_writer, tls_user) = match handle_tls_handshake_with_shared(
@@ -670,6 +773,12 @@ where
                HandshakeResult::Success(result) => result,
                HandshakeResult::BadClient { reader, writer } => {
                    stats.increment_connects_bad_with_class("tls_handshake_bad_client");
+                    record_tls_fingerprint_bad_or_probe(
+                        stats.as_ref(),
+                        &config,
+                        real_peer.ip(),
+                        tls_fingerprint.as_ref(),
+                    );
                    return Ok(masking_outcome(
                        reader,
                        writer,
@@ -681,10 +790,23 @@ where
                    ));
                }
                HandshakeResult::Error(e) => {
+                    record_tls_fingerprint_bad_or_probe(
+                        stats.as_ref(),
+                        &config,
+                        real_peer.ip(),
+                        tls_fingerprint.as_ref(),
+                    );
                    increment_bad_on_unknown_tls_sni(stats.as_ref(), &e);
                    return Err(e);
                }
            };
+            record_tls_fingerprint_auth_success(
+                stats.as_ref(),
+                &config,
+                real_peer.ip(),
+                tls_fingerprint.as_ref(),
+                tls_user.as_str(),
+            );

            debug!(peer = %peer, "Reading MTProto handshake through TLS");
            let mtproto_data = tls_reader.read_exact(HANDSHAKE_LEN).await?;
@@ -731,6 +853,7 @@ where
                RunningClientHandler::handle_authenticated_static_with_shared(
                    crypto_reader, crypto_writer, success,
                    upstream_manager, stats, config, buffer_pool, rng, me_pool,
+                    me_pool_runtime,
                    route_runtime.clone(),
                    local_addr, real_peer, ip_tracker.clone(),
                    shared.clone(),
@@ -791,6 +914,7 @@ where
                    buffer_pool,
                    rng,
                    me_pool,
+                    me_pool_runtime,
                    route_runtime.clone(),
                    local_addr,
                    real_peer,
@@ -846,6 +970,7 @@ pub struct RunningClientHandler {
    buffer_pool: Arc<BufferPool>,
    rng: Arc<SecureRandom>,
    me_pool: Option<Arc<MePool>>,
+    me_pool_runtime: Option<Arc<RwLock<Option<Arc<MePool>>>>>,
    route_runtime: Arc<RouteRuntimeController>,
    tls_cache: Option<Arc<TlsFrontCache>>,
    ip_tracker: Arc<UserIpTracker>,
@@ -891,6 +1016,7 @@ impl ClientHandler {
            buffer_pool,
            rng,
            me_pool,
+            None,
            route_runtime,
            tls_cache,
            ip_tracker,
@@ -915,6 +1041,7 @@ impl ClientHandler {
        buffer_pool: Arc<BufferPool>,
        rng: Arc<SecureRandom>,
        me_pool: Option<Arc<MePool>>,
+        me_pool_runtime: Option<Arc<RwLock<Option<Arc<MePool>>>>>,
        route_runtime: Arc<RouteRuntimeController>,
        tls_cache: Option<Arc<TlsFrontCache>>,
        ip_tracker: Arc<UserIpTracker>,
@@ -938,6 +1065,7 @@ impl ClientHandler {
            buffer_pool,
            rng,
            me_pool,
+            me_pool_runtime,
            route_runtime,
            tls_cache,
            ip_tracker,
@@ -1244,6 +1372,13 @@ impl RunningClientHandler {
            ));
        }

+        let tls_fingerprint = observe_tls_client_fingerprint(
+            self.stats.as_ref(),
+            &self.config,
+            peer.ip(),
+            &handshake,
+        );
+
        let config = self.config.clone();
        let replay_checker = self.replay_checker.clone();
        let stats = self.stats.clone();
@@ -1267,6 +1402,12 @@ impl RunningClientHandler {
            HandshakeResult::Success(result) => result,
            HandshakeResult::BadClient { reader, writer } => {
                stats.increment_connects_bad_with_class("tls_handshake_bad_client");
+                record_tls_fingerprint_bad_or_probe(
+                    stats.as_ref(),
+                    &config,
+                    peer.ip(),
+                    tls_fingerprint.as_ref(),
+                );
                return Ok(masking_outcome(
                    reader,
                    writer,
@@ -1278,10 +1419,23 @@ impl RunningClientHandler {
                ));
            }
            HandshakeResult::Error(e) => {
+                record_tls_fingerprint_bad_or_probe(
+                    stats.as_ref(),
+                    &config,
+                    peer.ip(),
+                    tls_fingerprint.as_ref(),
+                );
                increment_bad_on_unknown_tls_sni(stats.as_ref(), &e);
                return Err(e);
            }
        };
+        record_tls_fingerprint_auth_success(
+            stats.as_ref(),
+            &config,
+            peer.ip(),
+            tls_fingerprint.as_ref(),
+            tls_user.as_str(),
+        );

        debug!(peer = %peer, "Reading MTProto handshake through TLS");
        let mtproto_data = tls_reader.read_exact(HANDSHAKE_LEN).await?;
@@ -1345,6 +1499,7 @@ impl RunningClientHandler {
                buffer_pool,
                self.rng,
                self.me_pool,
+                self.me_pool_runtime,
                self.route_runtime.clone(),
                local_addr,
                peer,
@@ -1429,6 +1584,7 @@ impl RunningClientHandler {
                buffer_pool,
                self.rng,
                self.me_pool,
+                self.me_pool_runtime,
                self.route_runtime.clone(),
                local_addr,
                peer,
@@ -1472,6 +1628,7 @@ impl RunningClientHandler {
            buffer_pool,
            rng,
            me_pool,
+            None,
            route_runtime,
            local_addr,
            peer_addr,
@@ -1491,6 +1648,7 @@ impl RunningClientHandler {
        buffer_pool: Arc<BufferPool>,
        rng: Arc<SecureRandom>,
        me_pool: Option<Arc<MePool>>,
+        me_pool_runtime: Option<Arc<RwLock<Option<Arc<MePool>>>>>,
        route_runtime: Arc<RouteRuntimeController>,
        local_addr: SocketAddr,
        peer_addr: SocketAddr,
@@ -1503,6 +1661,11 @@ impl RunningClientHandler {
    {
        let user = success.user.clone();

+        if !shared.is_user_enabled(&user) {
+            warn!(user = %user, "Disabled user rejected");
+            return Err(ProxyError::UserDisabled { user });
+        }
+
        let user_limit_reservation = match Self::acquire_user_connection_reservation_static(
            &user,
            &config,
@@ -1521,15 +1684,31 @@ impl RunningClientHandler {

        let route_snapshot = route_runtime.snapshot();
        let session_id = rng.u64();
-        let relay_result = if config.general.use_middle_proxy
+        let _user_session = shared.register_user_session(&user, session_id);
+        let session_cancel = _user_session.token();
+        let selected_me_pool = if config.general.use_middle_proxy
            && matches!(route_snapshot.mode, RelayRouteMode::Middle)
        {
            if let Some(ref pool) = me_pool {
+                Some(pool.clone())
+            } else if let Some(pool_runtime) = me_pool_runtime.as_ref() {
+                pool_runtime.read().await.clone()
+            } else {
+                None
+            }
+        } else {
+            None
+        };
+
+        let relay_result = if config.general.use_middle_proxy
+            && matches!(route_snapshot.mode, RelayRouteMode::Middle)
+        {
+            if let Some(pool) = selected_me_pool {
                handle_via_middle_proxy(
                    client_reader,
                    client_writer,
                    success,
-                    pool.clone(),
+                    pool,
                    stats.clone(),
                    config,
                    buffer_pool,
@@ -1538,6 +1717,7 @@ impl RunningClientHandler {
                    route_runtime.subscribe(),
                    route_snapshot,
                    session_id,
+                    session_cancel.clone(),
                    shared.clone(),
                )
                .await
@@ -1556,6 +1736,7 @@ impl RunningClientHandler {
                    route_snapshot,
                    session_id,
                    local_addr,
+                    session_cancel.clone(),
                    shared.clone(),
                )
                .await
@@ -1575,6 +1756,7 @@ impl RunningClientHandler {
                route_snapshot,
                session_id,
                local_addr,
+                session_cancel,
                shared.clone(),
            )
            .await
@@ -10,6 +10,7 @@ use std::time::Duration;

 use tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt, ReadHalf, WriteHalf, split};
 use tokio::sync::watch;
+use tokio_util::sync::CancellationToken;
 use tracing::{debug, info, warn};

 use crate::config::ProxyConfig;
@@ -258,6 +259,7 @@ where
        route_snapshot,
        session_id,
        SocketAddr::from(([0, 0, 0, 0], config.server.port)),
+        CancellationToken::new(),
        ProxySharedState::new(),
    )
    .await
@@ -276,6 +278,7 @@ pub(crate) async fn handle_via_direct_with_shared<R, W>(
    route_snapshot: RouteCutoverState,
    session_id: u64,
    local_addr: SocketAddr,
+    session_cancel: CancellationToken,
    shared: Arc<ProxySharedState>,
 ) -> Result<()>
 where
@@ -302,14 +305,25 @@ where
            "Ignoring invalid scope hint and falling back to default upstream selection"
        );
    }
-    let tg_stream = upstream_manager
-        .connect(dc_addr, Some(success.dc_idx), scope_hint)
-        .await?;
+    let tg_stream = tokio::select! {
+        result = upstream_manager.connect(dc_addr, Some(success.dc_idx), scope_hint) => result?,
+        _ = session_cancel.cancelled() => {
+            return Err(ProxyError::UserDisabled {
+                user: user.to_string(),
+            });
+        }
+    };

    debug!(peer = %success.peer, dc_addr = %dc_addr, "Connected, performing TG handshake");

-    let (tg_reader, tg_writer) =
-        do_tg_handshake_static(tg_stream, &success, &config, rng.as_ref()).await?;
+    let (tg_reader, tg_writer) = tokio::select! {
+        result = do_tg_handshake_static(tg_stream, &success, &config, rng.as_ref()) => result?,
+        _ = session_cancel.cancelled() => {
+            return Err(ProxyError::UserDisabled {
+                user: user.to_string(),
+            });
+        }
+    };

    debug!(peer = %success.peer, "TG handshake complete, starting relay");

@@ -331,20 +345,22 @@ where
    } else {
        Duration::from_secs(1800)
    };
-    let relay_result = crate::proxy::relay::relay_bidirectional_with_activity_timeout_and_lease(
-        client_reader,
-        client_writer,
-        tg_reader,
-        tg_writer,
-        config.general.direct_relay_copy_buf_c2s_bytes,
-        config.general.direct_relay_copy_buf_s2c_bytes,
-        user,
-        Arc::clone(&stats),
-        config.access.user_data_quota.get(user).copied(),
-        buffer_pool,
-        traffic_lease,
-        relay_activity_timeout,
-    );
+    let relay_result =
+        crate::proxy::relay::relay_bidirectional_with_activity_timeout_lease_and_cancel(
+            client_reader,
+            client_writer,
+            tg_reader,
+            tg_writer,
+            config.general.direct_relay_copy_buf_c2s_bytes,
+            config.general.direct_relay_copy_buf_s2c_bytes,
+            user,
+            Arc::clone(&stats),
+            config.access.user_data_quota.get(user).copied(),
+            buffer_pool,
+            traffic_lease,
+            relay_activity_timeout,
+            session_cancel.clone(),
+        );
    tokio::pin!(relay_result);
    let relay_result = loop {
        if let Some(cutover) =
@@ -358,6 +374,7 @@ where
                delay_ms = delay.as_millis() as u64,
                "Cutover affected direct session, closing client connection"
            );
+            let _cutover_park_lease = stats.acquire_direct_cutover_park_lease();
            tokio::time::sleep(delay).await;
            break Err(ProxyError::RouteSwitched);
        }
@@ -370,6 +387,11 @@ where
                    break relay_result.await;
                }
            }
+            _ = session_cancel.cancelled() => {
+                break Err(ProxyError::UserDisabled {
+                    user: user.to_string(),
+                });
+            }
        }
    };

@@ -1504,6 +1504,13 @@ where
    let validation_session_id_slice = &validation_session_id[..validation_session_id_len];

    let response = if let Some((cached_entry, use_full_cert_payload)) = cached {
+        let preferred_cipher_suite = if cached_entry.server_hello_template.cipher_suite == [0, 0] {
+            [0x13, 0x01]
+        } else {
+            cached_entry.server_hello_template.cipher_suite
+        };
+        let selected_cipher_suite =
+            tls::select_server_hello_cipher_suite(handshake, preferred_cipher_suite);
        emulator::build_emulated_server_hello(
            &validated_secret,
            &validation_digest,
@@ -1512,17 +1519,20 @@ where
            use_full_cert_payload,
            config.censorship.serverhello_compact,
            client_tls_version,
+            selected_cipher_suite,
            rng,
            selected_alpn.clone(),
            config.censorship.tls_new_session_tickets,
        )
    } else {
-        tls::build_server_hello(
+        let selected_cipher_suite = tls::select_server_hello_cipher_suite(handshake, [0x13, 0x01]);
+        tls::build_server_hello_with_cipher(
            &validated_secret,
            &validation_digest,
            validation_session_id_slice,
            config.censorship.fake_cert_len,
            rng,
+            selected_cipher_suite,
            selected_alpn.clone(),
            config.censorship.tls_new_session_tickets,
        )
@@ -47,6 +47,12 @@ struct CopyOutcome {
    ended_by_eof: bool,
 }

+#[derive(Clone, Copy)]
+struct MaskTcpTarget<'a> {
+    host: &'a str,
+    port: u16,
+}
+
 async fn copy_with_idle_timeout<R, W>(
    reader: &mut R,
    writer: &mut W,
@@ -331,7 +337,9 @@ async fn wait_mask_outcome_budget(started: Instant, config: &ProxyConfig) {

 #[cfg(test)]
 mod tls_domain_mask_host_tests {
-    use super::{mask_host_for_initial_data, matching_tls_domain_for_sni};
+    use super::{
+        mask_host_for_initial_data, mask_tcp_target_for_initial_data, matching_tls_domain_for_sni,
+    };
    use crate::config::ProxyConfig;

    fn client_hello_with_sni(sni_host: &str) -> Vec<u8> {
@@ -410,6 +418,25 @@ mod tls_domain_mask_host_tests {

        assert_eq!(mask_host_for_initial_data(&config, &initial_data), "b.com");
    }
+
+    #[test]
+    fn exclusive_mask_target_overrides_only_matching_sni() {
+        let mut config = config_with_tls_domains();
+        config
+            .censorship
+            .exclusive_mask
+            .insert("b.com".to_string(), "origin-b.example:8443".to_string());
+        let b_initial_data = client_hello_with_sni("B.COM");
+        let c_initial_data = client_hello_with_sni("c.com");
+
+        let b_target = mask_tcp_target_for_initial_data(&config, &b_initial_data);
+        let c_target = mask_tcp_target_for_initial_data(&config, &c_initial_data);
+
+        assert_eq!(b_target.host, "origin-b.example");
+        assert_eq!(b_target.port, 8443);
+        assert_eq!(c_target.host, "c.com");
+        assert_eq!(c_target.port, config.censorship.mask_port);
+    }
 }

 /// Detect client type based on initial data
@@ -458,7 +485,92 @@ fn matching_tls_domain_for_sni<'a>(config: &'a ProxyConfig, sni: &str) -> Option
    None
 }

+fn parse_exclusive_mask_target(target: &str) -> Option<MaskTcpTarget<'_>> {
+    let target = target.trim();
+    if target.is_empty() {
+        return None;
+    }
+
+    if target.starts_with('[') {
+        let end = target.find(']')?;
+        if target.get(end + 1..end + 2)? != ":" {
+            return None;
+        }
+        let port = target[end + 2..].parse::<u16>().ok()?;
+        return (port > 0).then_some(MaskTcpTarget {
+            host: &target[..=end],
+            port,
+        });
+    }
+
+    let (host, port) = target.rsplit_once(':')?;
+    if host.is_empty() || host.contains(':') {
+        return None;
+    }
+    let port = port.parse::<u16>().ok()?;
+    (port > 0).then_some(MaskTcpTarget { host, port })
+}
+
+fn exclusive_mask_target_for_sni<'a>(
+    config: &'a ProxyConfig,
+    sni: &str,
+) -> Option<MaskTcpTarget<'a>> {
+    if let Some(target) = config.censorship.exclusive_mask_targets.get(sni) {
+        return Some(MaskTcpTarget {
+            host: target.host.as_str(),
+            port: target.port,
+        });
+    }
+    if let Some(target) = config.censorship.exclusive_mask.get(sni) {
+        return parse_exclusive_mask_target(target);
+    }
+
+    if sni.bytes().any(|byte| byte.is_ascii_uppercase()) {
+        let normalized_sni = sni.to_ascii_lowercase();
+        if let Some(target) = config
+            .censorship
+            .exclusive_mask_targets
+            .get(&normalized_sni)
+        {
+            return Some(MaskTcpTarget {
+                host: target.host.as_str(),
+                port: target.port,
+            });
+        }
+        if let Some(target) = config.censorship.exclusive_mask.get(&normalized_sni) {
+            return parse_exclusive_mask_target(target);
+        }
+    }
+
+    None
+}
+
+#[cfg(test)]
 fn mask_host_for_initial_data<'a>(config: &'a ProxyConfig, initial_data: &[u8]) -> &'a str {
+    mask_tcp_target_for_initial_data(config, initial_data).host
+}
+
+#[cfg(test)]
+fn mask_tcp_target_for_initial_data<'a>(
+    config: &'a ProxyConfig,
+    initial_data: &[u8],
+) -> MaskTcpTarget<'a> {
+    let sni = tls::extract_sni_from_client_hello(initial_data);
+    if let Some(target) = sni
+        .as_deref()
+        .and_then(|sni| exclusive_mask_target_for_sni(config, sni))
+    {
+        return target;
+    }
+
+    default_mask_tcp_target_for_initial_data(config, initial_data, sni.as_deref())
+}
+
+fn default_mask_tcp_target_for_initial_data<'a>(
+    config: &'a ProxyConfig,
+    initial_data: &[u8],
+    sni: Option<&str>,
+) -> MaskTcpTarget<'a> {
    let configured_mask_host = config
        .censorship
        .mask_host
@@ -466,13 +578,25 @@ fn mask_host_for_initial_data<'a>(config: &'a ProxyConfig, initial_data: &[u8])
        .unwrap_or(&config.censorship.tls_domain);

    if !configured_mask_host.eq_ignore_ascii_case(&config.censorship.tls_domain) {
-        return configured_mask_host;
+        return MaskTcpTarget {
+            host: configured_mask_host,
+            port: config.censorship.mask_port,
+        };
    }

-    tls::extract_sni_from_client_hello(initial_data)
-        .as_deref()
+    let extracted_sni = if sni.is_none() {
+        tls::extract_sni_from_client_hello(initial_data)
+    } else {
+        None
+    };
+    let host = sni
+        .or(extracted_sni.as_deref())
        .and_then(|sni| matching_tls_domain_for_sni(config, sni))
-        .unwrap_or(configured_mask_host)
+        .unwrap_or(configured_mask_host);
+    MaskTcpTarget {
+        host,
+        port: config.censorship.mask_port,
+    }
 }

 fn canonical_ip(ip: IpAddr) -> IpAddr {
@@ -770,9 +894,16 @@ pub async fn handle_bad_client<R, W>(
        return;
    }

+    let client_sni = tls::extract_sni_from_client_hello(initial_data);
+    let exclusive_tcp_target = client_sni
+        .as_deref()
+        .and_then(|sni| exclusive_mask_target_for_sni(config, sni));
+
    // Connect via Unix socket or TCP
    #[cfg(unix)]
-    if let Some(ref sock_path) = config.censorship.mask_unix_sock {
+    if exclusive_tcp_target.is_none()
+        && let Some(ref sock_path) = config.censorship.mask_unix_sock
+    {
        let outcome_started = Instant::now();
        let connect_started = Instant::now();
        debug!(
@@ -849,8 +980,11 @@ pub async fn handle_bad_client<R, W>(
        return;
    }

-    let mask_host = mask_host_for_initial_data(config, initial_data);
-    let mask_port = config.censorship.mask_port;
+    let mask_target = exclusive_tcp_target.unwrap_or_else(|| {
+        default_mask_tcp_target_for_initial_data(config, initial_data, client_sni.as_deref())
+    });
+    let mask_host = mask_target.host;
+    let mask_port = mask_target.port;

    // Fail closed when fallback points at our own listener endpoint.
    // Self-referential masking can create recursive proxy loops under
@@ -0,0 +1,104 @@
+use super::*;
+
+pub(in crate::proxy::middle_relay) enum C2MeCommand {
+    Data {
+        payload: PooledBuffer,
+        flags: u32,
+        _permit: OwnedSemaphorePermit,
+    },
+    Close,
+}
+
+pub(super) fn should_yield_c2me_sender(sent_since_yield: usize, has_backlog: bool) -> bool {
+    has_backlog && sent_since_yield >= C2ME_SENDER_FAIRNESS_BUDGET
+}
+
+pub(super) fn c2me_payload_permits(payload_len: usize) -> u32 {
+    payload_len
+        .max(1)
+        .div_ceil(C2ME_QUEUED_BYTE_PERMIT_UNIT)
+        .min(u32::MAX as usize) as u32
+}
+
+pub(super) fn c2me_queued_permit_budget(channel_capacity: usize, frame_limit: usize) -> usize {
+    channel_capacity
+        .saturating_mul(C2ME_QUEUED_PERMITS_PER_SLOT)
+        .max(c2me_payload_permits(frame_limit) as usize)
+        .max(1)
+}
+
+pub(super) async fn acquire_c2me_payload_permit(
+    semaphore: &Arc<Semaphore>,
+    payload_len: usize,
+    send_timeout: Option<Duration>,
+    stats: &Stats,
+) -> Result<OwnedSemaphorePermit> {
+    let permits = c2me_payload_permits(payload_len);
+    let acquire = semaphore.clone().acquire_many_owned(permits);
+    match send_timeout {
+        Some(send_timeout) => match timeout(send_timeout, acquire).await {
+            Ok(Ok(permit)) => Ok(permit),
+            Ok(Err(_)) => Err(ProxyError::Proxy("ME sender byte budget closed".into())),
+            Err(_) => {
+                stats.increment_me_c2me_send_timeout_total();
+                Err(ProxyError::Proxy("ME sender byte budget timeout".into()))
+            }
+        },
+        None => acquire
+            .await
+            .map_err(|_| ProxyError::Proxy("ME sender byte budget closed".into())),
+    }
+}
+
+pub(super) async fn enqueue_c2me_command_in(
+    shared: &ProxySharedState,
+    tx: &mpsc::Sender<C2MeCommand>,
+    cmd: C2MeCommand,
+    send_timeout: Option<Duration>,
+    stats: &Stats,
+) -> std::result::Result<(), mpsc::error::SendError<C2MeCommand>> {
+    match tx.try_send(cmd) {
+        Ok(()) => Ok(()),
+        Err(mpsc::error::TrySendError::Closed(cmd)) => Err(mpsc::error::SendError(cmd)),
+        Err(mpsc::error::TrySendError::Full(cmd)) => {
+            stats.increment_me_c2me_send_full_total();
+            stats.increment_me_c2me_send_high_water_total();
+            note_relay_pressure_event_in(shared);
+            // Cooperative yield reduces burst catch-up when the per-conn queue is near saturation.
+            if tx.capacity() <= C2ME_SOFT_PRESSURE_MIN_FREE_SLOTS {
+                tokio::task::yield_now().await;
+            }
+            let reserve_result = match send_timeout {
+                Some(send_timeout) => match timeout(send_timeout, tx.reserve()).await {
+                    Ok(result) => result,
+                    Err(_) => {
+                        stats.increment_me_c2me_send_timeout_total();
+                        return Err(mpsc::error::SendError(cmd));
+                    }
+                },
+                None => tx.reserve().await,
+            };
+            match reserve_result {
+                Ok(permit) => {
+                    permit.send(cmd);
+                    Ok(())
+                }
+                Err(_) => {
+                    stats.increment_me_c2me_send_timeout_total();
+                    Err(mpsc::error::SendError(cmd))
+                }
+            }
+        }
+    }
+}
+
+#[cfg(test)]
+pub(crate) async fn enqueue_c2me_command(
+    tx: &mpsc::Sender<C2MeCommand>,
+    cmd: C2MeCommand,
+    send_timeout: Option<Duration>,
+    stats: &Stats,
+) -> std::result::Result<(), mpsc::error::SendError<C2MeCommand>> {
+    let shared = ProxySharedState::new();
+    enqueue_c2me_command_in(shared.as_ref(), tx, cmd, send_timeout, stats).await
+}
@@ -0,0 +1,458 @@
+use super::*;
+
+#[derive(Clone, Copy)]
+pub(super) struct MeD2cFlushPolicy {
+    pub(super) max_frames: usize,
+    pub(super) max_bytes: usize,
+    pub(super) max_delay: Duration,
+    pub(super) ack_flush_immediate: bool,
+    pub(super) quota_soft_overshoot_bytes: u64,
+    pub(super) frame_buf_shrink_threshold_bytes: usize,
+}
+
+impl MeD2cFlushPolicy {
+    pub(super) fn from_config(config: &ProxyConfig) -> Self {
+        Self {
+            max_frames: config
+                .general
+                .me_d2c_flush_batch_max_frames
+                .max(ME_D2C_FLUSH_BATCH_MAX_FRAMES_MIN),
+            max_bytes: config
+                .general
+                .me_d2c_flush_batch_max_bytes
+                .max(ME_D2C_FLUSH_BATCH_MAX_BYTES_MIN),
+            max_delay: Duration::from_micros(config.general.me_d2c_flush_batch_max_delay_us),
+            ack_flush_immediate: config.general.me_d2c_ack_flush_immediate,
+            quota_soft_overshoot_bytes: config.general.me_quota_soft_overshoot_bytes,
+            frame_buf_shrink_threshold_bytes: config
+                .general
+                .me_d2c_frame_buf_shrink_threshold_bytes
+                .max(4096),
+        }
+    }
+}
+
+pub(super) fn classify_me_d2c_flush_reason(
+    flush_immediately: bool,
+    batch_frames: usize,
+    max_frames: usize,
+    batch_bytes: usize,
+    max_bytes: usize,
+    max_delay_fired: bool,
+) -> MeD2cFlushReason {
+    if flush_immediately {
+        return MeD2cFlushReason::AckImmediate;
+    }
+    if batch_frames >= max_frames {
+        return MeD2cFlushReason::BatchFrames;
+    }
+    if batch_bytes >= max_bytes {
+        return MeD2cFlushReason::BatchBytes;
+    }
+    if max_delay_fired {
+        return MeD2cFlushReason::MaxDelay;
+    }
+    MeD2cFlushReason::QueueDrain
+}
+
+pub(super) fn observe_me_d2c_flush_event(
+    stats: &Stats,
+    reason: MeD2cFlushReason,
+    batch_frames: usize,
+    batch_bytes: usize,
+    flush_duration_us: Option<u64>,
+) {
+    stats.increment_me_d2c_flush_reason(reason);
+    if batch_frames > 0 || batch_bytes > 0 {
+        stats.increment_me_d2c_batches_total();
+        stats.add_me_d2c_batch_frames_total(batch_frames as u64);
+        stats.add_me_d2c_batch_bytes_total(batch_bytes as u64);
+        stats.observe_me_d2c_batch_frames(batch_frames as u64);
+        stats.observe_me_d2c_batch_bytes(batch_bytes as u64);
+    }
+    if let Some(duration_us) = flush_duration_us {
+        stats.observe_me_d2c_flush_duration_us(duration_us);
+    }
+}
+
+pub(super) enum MeWriterResponseOutcome {
+    Continue {
+        frames: usize,
+        bytes: usize,
+        flush_immediately: bool,
+    },
+    Close,
+}
+
+#[cfg(test)]
+pub(crate) async fn process_me_writer_response<W>(
+    response: MeResponse,
+    client_writer: &mut CryptoWriter<W>,
+    proto_tag: ProtoTag,
+    rng: &SecureRandom,
+    frame_buf: &mut Vec<u8>,
+    stats: &Stats,
+    user: &str,
+    quota_user_stats: Option<&UserStats>,
+    quota_limit: Option<u64>,
+    quota_soft_overshoot_bytes: u64,
+    bytes_me2c: &AtomicU64,
+    conn_id: u64,
+    ack_flush_immediate: bool,
+    batched: bool,
+) -> Result<MeWriterResponseOutcome>
+where
+    W: AsyncWrite + Unpin + Send + 'static,
+{
+    process_me_writer_response_with_traffic_lease(
+        response,
+        client_writer,
+        proto_tag,
+        rng,
+        frame_buf,
+        stats,
+        user,
+        quota_user_stats,
+        quota_limit,
+        quota_soft_overshoot_bytes,
+        None,
+        &CancellationToken::new(),
+        bytes_me2c,
+        conn_id,
+        ack_flush_immediate,
+        batched,
+    )
+    .await
+}
+
+pub(crate) async fn process_me_writer_response_with_traffic_lease<W>(
+    response: MeResponse,
+    client_writer: &mut CryptoWriter<W>,
+    proto_tag: ProtoTag,
+    rng: &SecureRandom,
+    frame_buf: &mut Vec<u8>,
+    stats: &Stats,
+    user: &str,
+    quota_user_stats: Option<&UserStats>,
+    quota_limit: Option<u64>,
+    quota_soft_overshoot_bytes: u64,
+    traffic_lease: Option<&Arc<TrafficLease>>,
+    cancel: &CancellationToken,
+    bytes_me2c: &AtomicU64,
+    conn_id: u64,
+    ack_flush_immediate: bool,
+    batched: bool,
+) -> Result<MeWriterResponseOutcome>
+where
+    W: AsyncWrite + Unpin + Send + 'static,
+{
+    match response {
+        MeResponse::Data { flags, data, .. } => {
+            if batched {
+                trace!(conn_id, bytes = data.len(), flags, "ME->C data (batched)");
+            } else {
+                trace!(conn_id, bytes = data.len(), flags, "ME->C data");
+            }
+            let data_len = data.len() as u64;
+            if let (Some(limit), Some(user_stats)) = (quota_limit, quota_user_stats) {
+                let soft_limit = quota_soft_cap(limit, quota_soft_overshoot_bytes);
+                match reserve_user_quota_with_yield(
+                    user_stats, data_len, soft_limit, stats, cancel, None,
+                )
+                .await
+                {
+                    Ok(_) => {}
+                    Err(MiddleQuotaReserveError::LimitExceeded) => {
+                        stats.increment_me_d2c_quota_reject_total(MeD2cQuotaRejectStage::PreWrite);
+                        return Err(ProxyError::DataQuotaExceeded {
+                            user: user.to_string(),
+                        });
+                    }
+                    Err(MiddleQuotaReserveError::Contended) => {
+                        return Err(ProxyError::Proxy(
+                            "ME D->C quota reservation contended".into(),
+                        ));
+                    }
+                    Err(MiddleQuotaReserveError::Cancelled) => {
+                        return Err(ProxyError::Proxy(
+                            "ME D->C quota reservation cancelled".into(),
+                        ));
+                    }
+                    Err(MiddleQuotaReserveError::DeadlineExceeded) => {
+                        return Err(ProxyError::Proxy(
+                            "ME D->C quota reservation deadline exceeded".into(),
+                        ));
+                    }
+                }
+            }
+            wait_for_traffic_budget_or_cancel(
+                traffic_lease,
+                RateDirection::Down,
+                data_len,
+                cancel,
+                stats,
+                None,
+            )
+            .await?;
+
+            let write_mode = match write_client_payload(
+                client_writer,
+                proto_tag,
+                flags,
+                &data,
+                rng,
+                frame_buf,
+                cancel,
+            )
+            .await
+            {
+                Ok(mode) => mode,
+                Err(err) => {
+                    if quota_limit.is_some() {
+                        stats.add_quota_write_fail_bytes_total(data_len);
+                        stats.increment_quota_write_fail_events_total();
+                    }
+                    return Err(err);
+                }
+            };
+
+            bytes_me2c.fetch_add(data_len, Ordering::Relaxed);
+            if let Some(user_stats) = quota_user_stats {
+                stats.add_user_octets_to_handle(user_stats, data_len);
+            } else {
+                stats.add_user_octets_to(user, data_len);
+            }
+            stats.increment_me_d2c_data_frames_total();
+            stats.add_me_d2c_payload_bytes_total(data_len);
+            stats.increment_me_d2c_write_mode(write_mode);
+
+            Ok(MeWriterResponseOutcome::Continue {
+                frames: 1,
+                bytes: data.len(),
+                flush_immediately: false,
+            })
+        }
+        MeResponse::Ack(confirm) => {
+            if batched {
+                trace!(conn_id, confirm, "ME->C quickack (batched)");
+            } else {
+                trace!(conn_id, confirm, "ME->C quickack");
+            }
+            wait_for_traffic_budget_or_cancel(
+                traffic_lease,
+                RateDirection::Down,
+                4,
+                cancel,
+                stats,
+                None,
+            )
+            .await?;
+            write_client_ack(client_writer, proto_tag, confirm, cancel).await?;
+            stats.increment_me_d2c_ack_frames_total();
+
+            Ok(MeWriterResponseOutcome::Continue {
+                frames: 1,
+                bytes: 4,
+                flush_immediately: ack_flush_immediate,
+            })
+        }
+        MeResponse::Close => {
+            if batched {
+                debug!(conn_id, "ME sent close (batched)");
+            } else {
+                debug!(conn_id, "ME sent close");
+            }
+            Ok(MeWriterResponseOutcome::Close)
+        }
+    }
+}
+
+/// Computes the intermediate/secure wire length while rejecting lossy casts.
+pub(in crate::proxy::middle_relay) fn compute_intermediate_secure_wire_len(
+    data_len: usize,
+    padding_len: usize,
+    quickack: bool,
+) -> Result<(u32, usize)> {
+    let wire_len = data_len
+        .checked_add(padding_len)
+        .ok_or_else(|| ProxyError::Proxy("Frame length overflow".into()))?;
+    if wire_len > 0x7fff_ffffusize {
+        return Err(ProxyError::Proxy(format!(
+            "Intermediate/Secure frame too large: {wire_len}"
+        )));
+    }
+
+    let total = 4usize
+        .checked_add(wire_len)
+        .ok_or_else(|| ProxyError::Proxy("Frame buffer size overflow".into()))?;
+    let mut len_val = u32::try_from(wire_len)
+        .map_err(|_| ProxyError::Proxy("Frame length conversion overflow".into()))?;
+    if quickack {
+        len_val |= 0x8000_0000;
+    }
+    Ok((len_val, total))
+}
+
+pub(super) async fn write_client_payload<W>(
+    client_writer: &mut CryptoWriter<W>,
+    proto_tag: ProtoTag,
+    flags: u32,
+    data: &[u8],
+    rng: &SecureRandom,
+    frame_buf: &mut Vec<u8>,
+    cancel: &CancellationToken,
+) -> Result<MeD2cWriteMode>
+where
+    W: AsyncWrite + Unpin + Send + 'static,
+{
+    let quickack = (flags & RPC_FLAG_QUICKACK) != 0;
+
+    let write_mode = match proto_tag {
+        ProtoTag::Abridged => {
+            if !data.len().is_multiple_of(4) {
+                return Err(ProxyError::Proxy(format!(
+                    "Abridged payload must be 4-byte aligned, got {}",
+                    data.len()
+                )));
+            }
+
+            let len_words = data.len() / 4;
+            if len_words < 0x7f {
+                let mut first = len_words as u8;
+                if quickack {
+                    first |= 0x80;
+                }
+                let wire_len = 1usize.saturating_add(data.len());
+                if wire_len <= ME_D2C_SINGLE_WRITE_COALESCE_MAX_BYTES {
+                    frame_buf.clear();
+                    frame_buf.reserve(wire_len);
+                    frame_buf.push(first);
+                    frame_buf.extend_from_slice(data);
+                    write_all_client_or_cancel(client_writer, frame_buf.as_slice(), cancel).await?;
+                    MeD2cWriteMode::Coalesced
+                } else {
+                    let header = [first];
+                    write_all_client_or_cancel(client_writer, &header, cancel).await?;
+                    write_all_client_or_cancel(client_writer, data, cancel).await?;
+                    MeD2cWriteMode::Split
+                }
+            } else if len_words < (1 << 24) {
+                let mut first = 0x7fu8;
+                if quickack {
+                    first |= 0x80;
+                }
+                let lw = (len_words as u32).to_le_bytes();
+                let wire_len = 4usize.saturating_add(data.len());
+                if wire_len <= ME_D2C_SINGLE_WRITE_COALESCE_MAX_BYTES {
+                    frame_buf.clear();
+                    frame_buf.reserve(wire_len);
+                    frame_buf.extend_from_slice(&[first, lw[0], lw[1], lw[2]]);
+                    frame_buf.extend_from_slice(data);
+                    write_all_client_or_cancel(client_writer, frame_buf.as_slice(), cancel).await?;
+                    MeD2cWriteMode::Coalesced
+                } else {
+                    let header = [first, lw[0], lw[1], lw[2]];
+                    write_all_client_or_cancel(client_writer, &header, cancel).await?;
+                    write_all_client_or_cancel(client_writer, data, cancel).await?;
+                    MeD2cWriteMode::Split
+                }
+            } else {
+                return Err(ProxyError::Proxy(format!(
+                    "Abridged frame too large: {}",
+                    data.len()
+                )));
+            }
+        }
+        ProtoTag::Intermediate | ProtoTag::Secure => {
+            let padding_len = if proto_tag == ProtoTag::Secure {
+                if !is_valid_secure_payload_len(data.len()) {
+                    return Err(ProxyError::Proxy(format!(
+                        "Secure payload must be 4-byte aligned, got {}",
+                        data.len()
+                    )));
+                }
+                secure_padding_len(data.len(), rng)
+            } else {
+                0
+            };
+
+            let (len_val, total) =
+                compute_intermediate_secure_wire_len(data.len(), padding_len, quickack)?;
+            if total <= ME_D2C_SINGLE_WRITE_COALESCE_MAX_BYTES {
+                frame_buf.clear();
+                frame_buf.reserve(total);
+                frame_buf.extend_from_slice(&len_val.to_le_bytes());
+                frame_buf.extend_from_slice(data);
+                if padding_len > 0 {
+                    let start = frame_buf.len();
+                    frame_buf.resize(start + padding_len, 0);
+                    rng.fill(&mut frame_buf[start..]);
+                }
+                write_all_client_or_cancel(client_writer, frame_buf.as_slice(), cancel).await?;
+                MeD2cWriteMode::Coalesced
+            } else {
+                let header = len_val.to_le_bytes();
+                write_all_client_or_cancel(client_writer, &header, cancel).await?;
+                write_all_client_or_cancel(client_writer, data, cancel).await?;
+                if padding_len > 0 {
+                    frame_buf.clear();
+                    if frame_buf.capacity() < padding_len {
+                        frame_buf.reserve(padding_len);
+                    }
+                    frame_buf.resize(padding_len, 0);
+                    rng.fill(frame_buf.as_mut_slice());
+                    write_all_client_or_cancel(client_writer, frame_buf.as_slice(), cancel).await?;
+                }
+                MeD2cWriteMode::Split
+            }
+        }
+    };
+
+    Ok(write_mode)
+}
+
+pub(super) async fn write_client_ack<W>(
+    client_writer: &mut CryptoWriter<W>,
+    proto_tag: ProtoTag,
+    confirm: u32,
+    cancel: &CancellationToken,
+) -> Result<()>
+where
+    W: AsyncWrite + Unpin + Send + 'static,
+{
+    let bytes = if proto_tag == ProtoTag::Abridged {
+        confirm.to_be_bytes()
+    } else {
+        confirm.to_le_bytes()
+    };
+    write_all_client_or_cancel(client_writer, &bytes, cancel).await
+}
+
+pub(super) async fn write_all_client_or_cancel<W>(
+    client_writer: &mut CryptoWriter<W>,
+    bytes: &[u8],
+    cancel: &CancellationToken,
+) -> Result<()>
+where
+    W: AsyncWrite + Unpin + Send + 'static,
+{
+    tokio::select! {
+        biased;
+        _ = cancel.cancelled() => Err(ProxyError::MiddleClientWriterCancelled),
+        result = client_writer.write_all(bytes) => result.map_err(ProxyError::Io),
+    }
+}
+
+pub(super) async fn flush_client_or_cancel<W>(
+    client_writer: &mut CryptoWriter<W>,
+    cancel: &CancellationToken,
+) -> Result<()>
+where
+    W: AsyncWrite + Unpin + Send + 'static,
+{
+    tokio::select! {
+        biased;
+        _ = cancel.cancelled() => Err(ProxyError::MiddleClientWriterCancelled),
+        result = client_writer.flush() => result.map_err(ProxyError::Io),
+    }
+}
@@ -0,0 +1,406 @@
+use super::*;
+
+#[derive(Default)]
+pub(crate) struct DesyncDedupRotationState {
+    current_started_at: Option<Instant>,
+}
+
+pub(in crate::proxy::middle_relay) struct RelayForensicsState {
+    pub(in crate::proxy::middle_relay) trace_id: u64,
+    pub(in crate::proxy::middle_relay) conn_id: u64,
+    pub(in crate::proxy::middle_relay) user: String,
+    pub(in crate::proxy::middle_relay) peer: SocketAddr,
+    pub(in crate::proxy::middle_relay) peer_hash: u64,
+    pub(in crate::proxy::middle_relay) started_at: Instant,
+    pub(in crate::proxy::middle_relay) bytes_c2me: u64,
+    pub(in crate::proxy::middle_relay) bytes_me2c: Arc<AtomicU64>,
+    pub(in crate::proxy::middle_relay) desync_all_full: bool,
+}
+
+#[cfg(test)]
+pub(crate) fn hash_value<T: Hash>(value: &T) -> u64 {
+    let mut hasher = DefaultHasher::new();
+    value.hash(&mut hasher);
+    hasher.finish()
+}
+
+fn hash_value_in<T: Hash>(shared: &ProxySharedState, value: &T) -> u64 {
+    shared.middle_relay.desync_hasher.hash_one(value)
+}
+
+#[cfg(test)]
+pub(crate) fn hash_ip(ip: IpAddr) -> u64 {
+    hash_value(&ip)
+}
+
+pub(super) fn hash_ip_in(shared: &ProxySharedState, ip: IpAddr) -> u64 {
+    hash_value_in(shared, &ip)
+}
+
+fn should_emit_full_desync_in(
+    shared: &ProxySharedState,
+    key: u64,
+    all_full: bool,
+    now: Instant,
+) -> bool {
+    if all_full {
+        return true;
+    }
+
+    let dedup_current = &shared.middle_relay.desync_dedup;
+    let dedup_previous = &shared.middle_relay.desync_dedup_previous;
+    let rotation_state = &shared.middle_relay.desync_dedup_rotation_state;
+
+    let mut state = match rotation_state.lock() {
+        Ok(guard) => guard,
+        Err(poisoned) => {
+            let mut guard = poisoned.into_inner();
+            *guard = DesyncDedupRotationState::default();
+            rotation_state.clear_poison();
+            guard
+        }
+    };
+
+    let rotate_now = match state.current_started_at {
+        Some(current_started_at) => match now.checked_duration_since(current_started_at) {
+            Some(elapsed) => elapsed >= DESYNC_DEDUP_WINDOW,
+            None => true,
+        },
+        None => true,
+    };
+    if rotate_now {
+        dedup_previous.clear();
+        for entry in dedup_current.iter() {
+            dedup_previous.insert(*entry.key(), *entry.value());
+        }
+        dedup_current.clear();
+        state.current_started_at = Some(now);
+    }
+
+    if let Some(seen_at) = dedup_current.get(&key).map(|entry| *entry.value()) {
+        let within_window = match now.checked_duration_since(seen_at) {
+            Some(elapsed) => elapsed < DESYNC_DEDUP_WINDOW,
+            None => true,
+        };
+        if within_window {
+            return false;
+        }
+        dedup_current.insert(key, now);
+        return true;
+    }
+
+    if let Some(seen_at) = dedup_previous.get(&key).map(|entry| *entry.value()) {
+        let within_window = match now.checked_duration_since(seen_at) {
+            Some(elapsed) => elapsed < DESYNC_DEDUP_WINDOW,
+            None => true,
+        };
+        if within_window {
+            dedup_current.insert(key, seen_at);
+            return false;
+        }
+        dedup_previous.remove(&key);
+    }
+
+    if dedup_current.len() >= DESYNC_DEDUP_MAX_ENTRIES {
+        dedup_previous.clear();
+        for entry in dedup_current.iter() {
+            dedup_previous.insert(*entry.key(), *entry.value());
+        }
+        dedup_current.clear();
+        state.current_started_at = Some(now);
+        dedup_current.insert(key, now);
+        should_emit_full_desync_full_cache_in(shared, now)
+    } else {
+        dedup_current.insert(key, now);
+        true
+    }
+}
+
+fn should_emit_full_desync_full_cache_in(shared: &ProxySharedState, now: Instant) -> bool {
+    let gate = &shared.middle_relay.desync_full_cache_last_emit_at;
+    let Ok(mut last_emit_at) = gate.lock() else {
+        return false;
+    };
+
+    match *last_emit_at {
+        None => {
+            *last_emit_at = Some(now);
+            true
+        }
+        Some(last) => {
+            let Some(elapsed) = now.checked_duration_since(last) else {
+                *last_emit_at = Some(now);
+                return true;
+            };
+            if elapsed >= DESYNC_FULL_CACHE_EMIT_MIN_INTERVAL {
+                *last_emit_at = Some(now);
+                true
+            } else {
+                false
+            }
+        }
+    }
+}
+
+pub(crate) fn desync_forensics_len_bytes(len: usize) -> ([u8; 4], bool) {
+    match u32::try_from(len) {
+        Ok(value) => (value.to_le_bytes(), false),
+        Err(_) => (u32::MAX.to_le_bytes(), true),
+    }
+}
+
+pub(super) fn report_desync_frame_too_large_in(
+    shared: &ProxySharedState,
+    state: &RelayForensicsState,
+    proto_tag: ProtoTag,
+    frame_counter: u64,
+    max_frame: usize,
+    len: usize,
+    raw_len_bytes: Option<[u8; 4]>,
+    stats: &Stats,
+) -> ProxyError {
+    let (fallback_len_buf, len_buf_truncated) = desync_forensics_len_bytes(len);
+    let len_buf = raw_len_bytes.unwrap_or(fallback_len_buf);
+    let looks_like_tls = raw_len_bytes
+        .map(|b| b[0] == 0x16 && b[1] == 0x03)
+        .unwrap_or(false);
+    let looks_like_http = raw_len_bytes
+        .map(|b| matches!(b[0], b'G' | b'P' | b'H' | b'C' | b'D'))
+        .unwrap_or(false);
+    let now = Instant::now();
+    let dedup_key = hash_value_in(
+        shared,
+        &(
+            state.user.as_str(),
+            state.peer_hash,
+            proto_tag,
+            DESYNC_ERROR_CLASS,
+        ),
+    );
+    let emit_full = should_emit_full_desync_in(shared, dedup_key, state.desync_all_full, now);
+    let duration_ms = state.started_at.elapsed().as_millis() as u64;
+    let bytes_me2c = state.bytes_me2c.load(Ordering::Relaxed);
+
+    stats.increment_desync_total();
+    stats.increment_relay_protocol_desync_close_total();
+    stats.observe_desync_frames_ok(frame_counter);
+    if emit_full {
+        stats.increment_desync_full_logged();
+        warn!(
+            trace_id = format_args!("0x{:016x}", state.trace_id),
+            conn_id = state.conn_id,
+            user = %state.user,
+            peer_hash = format_args!("0x{:016x}", state.peer_hash),
+            proto = ?proto_tag,
+            mode = "middle_proxy",
+            is_tls = true,
+            duration_ms,
+            bytes_c2me = state.bytes_c2me,
+            bytes_me2c,
+            raw_len = len,
+            raw_len_hex = format_args!("0x{:08x}", len),
+            raw_len_bytes_truncated = len_buf_truncated,
+            raw_bytes = format_args!(
+                "{:02x} {:02x} {:02x} {:02x}",
+                len_buf[0], len_buf[1], len_buf[2], len_buf[3]
+            ),
+            max_frame,
+            tls_like = looks_like_tls,
+            http_like = looks_like_http,
+            frames_ok = frame_counter,
+            dedup_window_secs = DESYNC_DEDUP_WINDOW.as_secs(),
+            desync_all_full = state.desync_all_full,
+            full_reason = if state.desync_all_full { "desync_all_full" } else { "first_in_dedup_window" },
+            error_class = DESYNC_ERROR_CLASS,
+            "Frame too large — crypto desync forensics"
+        );
+        debug!(
+            trace_id = format_args!("0x{:016x}", state.trace_id),
+            conn_id = state.conn_id,
+            user = %state.user,
+            peer = %state.peer,
+            "Frame too large forensic peer detail"
+        );
+    } else {
+        stats.increment_desync_suppressed();
+        debug!(
+            trace_id = format_args!("0x{:016x}", state.trace_id),
+            conn_id = state.conn_id,
+            user = %state.user,
+            peer_hash = format_args!("0x{:016x}", state.peer_hash),
+            proto = ?proto_tag,
+            duration_ms,
+            bytes_c2me = state.bytes_c2me,
+            bytes_me2c,
+            raw_len = len,
+            frames_ok = frame_counter,
+            dedup_window_secs = DESYNC_DEDUP_WINDOW.as_secs(),
+            error_class = DESYNC_ERROR_CLASS,
+            "Frame too large — crypto desync forensic suppressed"
+        );
+    }
+
+    ProxyError::Proxy(format!(
+        "Frame too large: {len} (max {max_frame}), frames_ok={frame_counter}, conn_id={}, trace_id=0x{:016x}",
+        state.conn_id, state.trace_id
+    ))
+}
+
+#[cfg(test)]
+pub(crate) fn report_desync_frame_too_large(
+    state: &RelayForensicsState,
+    proto_tag: ProtoTag,
+    frame_counter: u64,
+    max_frame: usize,
+    len: usize,
+    raw_len_bytes: Option<[u8; 4]>,
+    stats: &Stats,
+) -> ProxyError {
+    let shared = ProxySharedState::new();
+    report_desync_frame_too_large_in(
+        shared.as_ref(),
+        state,
+        proto_tag,
+        frame_counter,
+        max_frame,
+        len,
+        raw_len_bytes,
+        stats,
+    )
+}
+
+#[cfg(test)]
+pub(crate) fn should_emit_full_desync_for_testing(
+    shared: &ProxySharedState,
+    key: u64,
+    all_full: bool,
+    now: Instant,
+) -> bool {
+    if all_full {
+        return true;
+    }
+
+    let dedup_current = &shared.middle_relay.desync_dedup;
+    let dedup_previous = &shared.middle_relay.desync_dedup_previous;
+
+    let Ok(mut state) = shared.middle_relay.desync_dedup_rotation_state.lock() else {
+        return false;
+    };
+
+    let rotate_now = match state.current_started_at {
+        Some(current_started_at) => match now.checked_duration_since(current_started_at) {
+            Some(elapsed) => elapsed >= DESYNC_DEDUP_WINDOW,
+            None => true,
+        },
+        None => true,
+    };
+    if rotate_now {
+        dedup_previous.clear();
+        for entry in dedup_current.iter() {
+            dedup_previous.insert(*entry.key(), *entry.value());
+        }
+        dedup_current.clear();
+        state.current_started_at = Some(now);
+    }
+
+    if let Some(seen_at) = dedup_current.get(&key).map(|entry| *entry.value()) {
+        let within_window = match now.checked_duration_since(seen_at) {
+            Some(elapsed) => elapsed < DESYNC_DEDUP_WINDOW,
+            None => true,
+        };
+        if within_window {
+            return false;
+        }
+        dedup_current.insert(key, now);
+        return true;
+    }
+
+    if let Some(seen_at) = dedup_previous.get(&key).map(|entry| *entry.value()) {
+        let within_window = match now.checked_duration_since(seen_at) {
+            Some(elapsed) => elapsed < DESYNC_DEDUP_WINDOW,
+            None => true,
+        };
+        if within_window {
+            dedup_current.insert(key, seen_at);
+            return false;
+        }
+        dedup_previous.remove(&key);
+    }
+
+    if dedup_current.len() >= DESYNC_DEDUP_MAX_ENTRIES {
+        dedup_previous.clear();
+        for entry in dedup_current.iter() {
+            dedup_previous.insert(*entry.key(), *entry.value());
+        }
+        dedup_current.clear();
+        state.current_started_at = Some(now);
+        dedup_current.insert(key, now);
+        let Ok(mut last_emit_at) = shared.middle_relay.desync_full_cache_last_emit_at.lock() else {
+            return false;
+        };
+        return match *last_emit_at {
+            None => {
+                *last_emit_at = Some(now);
+                true
+            }
+            Some(last) => {
+                let Some(elapsed) = now.checked_duration_since(last) else {
+                    *last_emit_at = Some(now);
+                    return true;
+                };
+                if elapsed >= DESYNC_FULL_CACHE_EMIT_MIN_INTERVAL {
+                    *last_emit_at = Some(now);
+                    true
+                } else {
+                    false
+                }
+            }
+        };
+    }
+
+    dedup_current.insert(key, now);
+    true
+}
+
+#[cfg(test)]
+pub(crate) fn clear_desync_dedup_for_testing_in_shared(shared: &ProxySharedState) {
+    shared.middle_relay.desync_dedup.clear();
+    shared.middle_relay.desync_dedup_previous.clear();
+    if let Ok(mut rotation_state) = shared.middle_relay.desync_dedup_rotation_state.lock() {
+        *rotation_state = DesyncDedupRotationState::default();
+    }
+    if let Ok(mut last_emit_at) = shared.middle_relay.desync_full_cache_last_emit_at.lock() {
+        *last_emit_at = None;
+    }
+}
+
+#[cfg(test)]
+pub(crate) fn desync_dedup_len_for_testing(shared: &ProxySharedState) -> usize {
+    shared.middle_relay.desync_dedup.len()
+}
+
+#[cfg(test)]
+pub(crate) fn desync_dedup_insert_for_testing(shared: &ProxySharedState, key: u64, at: Instant) {
+    shared.middle_relay.desync_dedup.insert(key, at);
+}
+
+#[cfg(test)]
+pub(crate) fn desync_dedup_get_for_testing(shared: &ProxySharedState, key: u64) -> Option<Instant> {
+    shared
+        .middle_relay
+        .desync_dedup
+        .get(&key)
+        .map(|entry| *entry.value())
+}
+
+#[cfg(test)]
+pub(crate) fn desync_dedup_keys_for_testing(
+    shared: &ProxySharedState,
+) -> std::collections::HashSet<u64> {
+    shared
+        .middle_relay
+        .desync_dedup
+        .iter()
+        .map(|entry| *entry.key())
+        .collect()
+}
@@ -0,0 +1,335 @@
+use super::*;
+use dashmap::DashMap;
+
+mod read;
+
+pub(crate) use self::read::read_client_payload_with_idle_policy_in;
+#[cfg(test)]
+pub(crate) use self::read::{
+    read_client_payload, read_client_payload_legacy, read_client_payload_with_idle_policy,
+};
+
+#[derive(Default)]
+pub(crate) struct RelayIdleCandidateRegistry {
+    pub(in crate::proxy::middle_relay) by_conn_id: DashMap<u64, RelayIdleCandidateMeta>,
+    pub(in crate::proxy::middle_relay) ordered: parking_lot::Mutex<BTreeSet<(u64, u64)>>,
+    pressure_event_seq: AtomicU64,
+    pressure_consumed_seq: AtomicU64,
+}
+
+/// Queue metadata used to preserve FIFO ordering for idle relay eviction.
+#[derive(Clone, Copy)]
+pub(in crate::proxy::middle_relay) struct RelayIdleCandidateMeta {
+    pub(in crate::proxy::middle_relay) mark_order_seq: u64,
+    pub(in crate::proxy::middle_relay) mark_pressure_seq: u64,
+}
+
+pub(super) fn mark_relay_idle_candidate_in(shared: &ProxySharedState, conn_id: u64) -> bool {
+    let registry = &shared.middle_relay.relay_idle_registry;
+
+    if registry.by_conn_id.contains_key(&conn_id) {
+        return false;
+    }
+
+    let mark_order_seq = shared
+        .middle_relay
+        .relay_idle_mark_seq
+        .fetch_add(1, Ordering::Relaxed)
+        .saturating_add(1);
+    let meta = RelayIdleCandidateMeta {
+        mark_order_seq,
+        mark_pressure_seq: registry.pressure_event_seq.load(Ordering::Relaxed),
+    };
+    match registry.by_conn_id.entry(conn_id) {
+        dashmap::mapref::entry::Entry::Occupied(_) => false,
+        dashmap::mapref::entry::Entry::Vacant(entry) => {
+            entry.insert(meta);
+            registry
+                .ordered
+                .lock()
+                .insert((meta.mark_order_seq, conn_id));
+            true
+        }
+    }
+}
+
+pub(super) fn clear_relay_idle_candidate_in(shared: &ProxySharedState, conn_id: u64) {
+    let registry = &shared.middle_relay.relay_idle_registry;
+
+    if let Some((_, meta)) = registry.by_conn_id.remove(&conn_id) {
+        registry
+            .ordered
+            .lock()
+            .remove(&(meta.mark_order_seq, conn_id));
+    }
+}
+
+pub(super) fn note_relay_pressure_event_in(shared: &ProxySharedState) {
+    shared
+        .middle_relay
+        .relay_idle_registry
+        .pressure_event_seq
+        .fetch_add(1, Ordering::Relaxed);
+}
+
+pub(crate) fn note_global_relay_pressure(shared: &ProxySharedState) {
+    note_relay_pressure_event_in(shared);
+}
+
+pub(super) fn relay_pressure_event_seq_in(shared: &ProxySharedState) -> u64 {
+    shared
+        .middle_relay
+        .relay_idle_registry
+        .pressure_event_seq
+        .load(Ordering::Relaxed)
+}
+
+pub(super) fn maybe_evict_idle_candidate_on_pressure_in(
+    shared: &ProxySharedState,
+    conn_id: u64,
+    seen_pressure_seq: &mut u64,
+    stats: &Stats,
+) -> bool {
+    let registry = &shared.middle_relay.relay_idle_registry;
+
+    let latest_pressure_seq = registry.pressure_event_seq.load(Ordering::Relaxed);
+    if latest_pressure_seq == *seen_pressure_seq {
+        return false;
+    }
+    *seen_pressure_seq = latest_pressure_seq;
+
+    let consumed_pressure_seq = registry.pressure_consumed_seq.load(Ordering::Relaxed);
+    if latest_pressure_seq == consumed_pressure_seq {
+        return false;
+    }
+
+    let oldest = {
+        let mut ordered = registry.ordered.lock();
+        loop {
+            let Some((mark_order_seq, candidate_conn_id)) = ordered.iter().next().copied() else {
+                // Empty queues consume the event so later candidates cannot replay stale pressure.
+                let _ = registry.pressure_consumed_seq.compare_exchange(
+                    consumed_pressure_seq,
+                    latest_pressure_seq,
+                    Ordering::Relaxed,
+                    Ordering::Relaxed,
+                );
+                return false;
+            };
+            let Some(candidate_meta) = registry.by_conn_id.get(&candidate_conn_id) else {
+                ordered.remove(&(mark_order_seq, candidate_conn_id));
+                continue;
+            };
+            if candidate_meta.mark_order_seq != mark_order_seq {
+                ordered.remove(&(mark_order_seq, candidate_conn_id));
+                continue;
+            }
+            break Some(candidate_conn_id);
+        }
+    };
+    if oldest != Some(conn_id) {
+        return false;
+    }
+
+    let Some(candidate_meta) = registry
+        .by_conn_id
+        .get(&conn_id)
+        .map(|entry| *entry.value())
+    else {
+        return false;
+    };
+
+    if latest_pressure_seq == candidate_meta.mark_pressure_seq {
+        return false;
+    }
+
+    // Claim the global pressure budget before removal; otherwise racing sessions
+    // can observe the next FIFO item and spend the same event more than once.
+    if registry
+        .pressure_consumed_seq
+        .compare_exchange(
+            consumed_pressure_seq,
+            latest_pressure_seq,
+            Ordering::Relaxed,
+            Ordering::Relaxed,
+        )
+        .is_err()
+    {
+        return false;
+    }
+
+    if let Some((_, meta)) = registry.by_conn_id.remove(&conn_id) {
+        registry
+            .ordered
+            .lock()
+            .remove(&(meta.mark_order_seq, conn_id));
+    }
+    stats.increment_relay_pressure_evict_total();
+    true
+}
+
+#[derive(Clone, Copy)]
+pub(in crate::proxy::middle_relay) struct RelayClientIdlePolicy {
+    pub(in crate::proxy::middle_relay) enabled: bool,
+    pub(in crate::proxy::middle_relay) soft_idle: Duration,
+    pub(in crate::proxy::middle_relay) hard_idle: Duration,
+    pub(in crate::proxy::middle_relay) grace_after_downstream_activity: Duration,
+    pub(in crate::proxy::middle_relay) legacy_frame_read_timeout: Duration,
+}
+
+impl RelayClientIdlePolicy {
+    pub(super) fn from_config(config: &ProxyConfig) -> Self {
+        let frame_read_timeout =
+            Duration::from_secs(config.timeouts.relay_client_idle_hard_secs.max(1));
+        if !config.timeouts.relay_idle_policy_v2_enabled {
+            return Self::disabled(frame_read_timeout);
+        }
+
+        let soft_idle = Duration::from_secs(config.timeouts.relay_client_idle_soft_secs.max(1));
+        let hard_idle = Duration::from_secs(config.timeouts.relay_client_idle_hard_secs.max(1));
+        let grace_after_downstream_activity = Duration::from_secs(
+            config
+                .timeouts
+                .relay_idle_grace_after_downstream_activity_secs,
+        );
+
+        Self {
+            enabled: true,
+            soft_idle,
+            hard_idle,
+            grace_after_downstream_activity,
+            legacy_frame_read_timeout: frame_read_timeout,
+        }
+    }
+
+    pub(in crate::proxy::middle_relay) fn disabled(frame_read_timeout: Duration) -> Self {
+        Self {
+            enabled: false,
+            soft_idle: frame_read_timeout,
+            hard_idle: frame_read_timeout,
+            grace_after_downstream_activity: Duration::ZERO,
+            legacy_frame_read_timeout: frame_read_timeout,
+        }
+    }
+
+    pub(super) fn apply_pressure_caps(&mut self, profile: ConntrackPressureProfile) {
+        let pressure_soft_idle_cap = Duration::from_secs(profile.middle_soft_idle_cap_secs());
+        let pressure_hard_idle_cap = Duration::from_secs(profile.middle_hard_idle_cap_secs());
+
+        self.soft_idle = self.soft_idle.min(pressure_soft_idle_cap);
+        self.hard_idle = self.hard_idle.min(pressure_hard_idle_cap);
+        if self.soft_idle > self.hard_idle {
+            self.soft_idle = self.hard_idle;
+        }
+        self.legacy_frame_read_timeout = self.legacy_frame_read_timeout.min(pressure_hard_idle_cap);
+        if self.grace_after_downstream_activity > self.hard_idle {
+            self.grace_after_downstream_activity = self.hard_idle;
+        }
+    }
+}
+
+#[derive(Clone, Copy)]
+pub(in crate::proxy::middle_relay) struct RelayClientIdleState {
+    pub(in crate::proxy::middle_relay) last_client_frame_at: Instant,
+    pub(in crate::proxy::middle_relay) soft_idle_marked: bool,
+    pub(in crate::proxy::middle_relay) tiny_frame_debt: u32,
+}
+
+impl RelayClientIdleState {
+    pub(super) fn new(now: Instant) -> Self {
+        Self {
+            last_client_frame_at: now,
+            soft_idle_marked: false,
+            tiny_frame_debt: 0,
+        }
+    }
+
+    pub(super) fn on_client_frame(&mut self, now: Instant) {
+        self.last_client_frame_at = now;
+        self.soft_idle_marked = false;
+    }
+
+    pub(super) fn on_client_tiny_frame(&mut self, now: Instant) {
+        self.last_client_frame_at = now;
+    }
+}
+
+#[cfg(test)]
+pub(crate) fn mark_relay_idle_candidate_for_testing(
+    shared: &ProxySharedState,
+    conn_id: u64,
+) -> bool {
+    mark_relay_idle_candidate_in(shared, conn_id)
+}
+
+#[cfg(test)]
+pub(crate) fn oldest_relay_idle_candidate_for_testing(shared: &ProxySharedState) -> Option<u64> {
+    let registry = &shared.middle_relay.relay_idle_registry;
+    registry
+        .ordered
+        .lock()
+        .iter()
+        .next()
+        .map(|(_, conn_id)| *conn_id)
+}
+
+#[cfg(test)]
+pub(crate) fn clear_relay_idle_candidate_for_testing(shared: &ProxySharedState, conn_id: u64) {
+    clear_relay_idle_candidate_in(shared, conn_id);
+}
+
+#[cfg(test)]
+pub(crate) fn clear_relay_idle_pressure_state_for_testing_in_shared(shared: &ProxySharedState) {
+    let registry = &shared.middle_relay.relay_idle_registry;
+    registry.by_conn_id.clear();
+    registry.ordered.lock().clear();
+    registry.pressure_event_seq.store(0, Ordering::Relaxed);
+    registry.pressure_consumed_seq.store(0, Ordering::Relaxed);
+    shared
+        .middle_relay
+        .relay_idle_mark_seq
+        .store(0, Ordering::Relaxed);
+}
+
+#[cfg(test)]
+pub(crate) fn note_relay_pressure_event_for_testing(shared: &ProxySharedState) {
+    note_relay_pressure_event_in(shared);
+}
+
+#[cfg(test)]
+pub(crate) fn relay_pressure_event_seq_for_testing(shared: &ProxySharedState) -> u64 {
+    relay_pressure_event_seq_in(shared)
+}
+
+#[cfg(test)]
+pub(crate) fn relay_idle_mark_seq_for_testing(shared: &ProxySharedState) -> u64 {
+    shared
+        .middle_relay
+        .relay_idle_mark_seq
+        .load(Ordering::Relaxed)
+}
+
+#[cfg(test)]
+pub(crate) fn maybe_evict_idle_candidate_on_pressure_for_testing(
+    shared: &ProxySharedState,
+    conn_id: u64,
+    seen_pressure_seq: &mut u64,
+    stats: &Stats,
+) -> bool {
+    maybe_evict_idle_candidate_on_pressure_in(shared, conn_id, seen_pressure_seq, stats)
+}
+
+#[cfg(test)]
+pub(crate) fn set_relay_pressure_state_for_testing(
+    shared: &ProxySharedState,
+    pressure_event_seq: u64,
+    pressure_consumed_seq: u64,
+) {
+    let registry = &shared.middle_relay.relay_idle_registry;
+    registry
+        .pressure_event_seq
+        .store(pressure_event_seq, Ordering::Relaxed);
+    registry
+        .pressure_consumed_seq
+        .store(pressure_consumed_seq, Ordering::Relaxed);
+}
@@ -0,0 +1,442 @@
+use super::*;
+
+pub(crate) async fn read_client_payload_with_idle_policy_in<R>(
+    client_reader: &mut CryptoReader<R>,
+    proto_tag: ProtoTag,
+    max_frame: usize,
+    buffer_pool: &Arc<BufferPool>,
+    forensics: &RelayForensicsState,
+    frame_counter: &mut u64,
+    stats: &Stats,
+    shared: &ProxySharedState,
+    idle_policy: &RelayClientIdlePolicy,
+    idle_state: &mut RelayClientIdleState,
+    last_downstream_activity_ms: &AtomicU64,
+    session_started_at: Instant,
+) -> Result<Option<(PooledBuffer, bool)>>
+where
+    R: AsyncRead + Unpin + Send + 'static,
+{
+    const LEGACY_MAX_CONSECUTIVE_ZERO_LEN_FRAMES: u32 = 4;
+
+    async fn read_exact_with_policy<R>(
+        client_reader: &mut CryptoReader<R>,
+        buf: &mut [u8],
+        idle_policy: &RelayClientIdlePolicy,
+        idle_state: &mut RelayClientIdleState,
+        last_downstream_activity_ms: &AtomicU64,
+        session_started_at: Instant,
+        forensics: &RelayForensicsState,
+        stats: &Stats,
+        shared: &ProxySharedState,
+        read_label: &'static str,
+    ) -> Result<()>
+    where
+        R: AsyncRead + Unpin + Send + 'static,
+    {
+        fn hard_deadline(
+            idle_policy: &RelayClientIdlePolicy,
+            idle_state: &RelayClientIdleState,
+            session_started_at: Instant,
+            last_downstream_activity_ms: u64,
+        ) -> Instant {
+            let mut deadline = idle_state.last_client_frame_at + idle_policy.hard_idle;
+            if idle_policy.grace_after_downstream_activity.is_zero() {
+                return deadline;
+            }
+
+            let downstream_at =
+                session_started_at + Duration::from_millis(last_downstream_activity_ms);
+            if downstream_at > idle_state.last_client_frame_at {
+                let grace_deadline = downstream_at + idle_policy.grace_after_downstream_activity;
+                if grace_deadline > deadline {
+                    deadline = grace_deadline;
+                }
+            }
+            deadline
+        }
+
+        let mut filled = 0usize;
+        while filled < buf.len() {
+            let timeout_window = if idle_policy.enabled {
+                let now = Instant::now();
+                let downstream_ms = last_downstream_activity_ms.load(Ordering::Relaxed);
+                let hard_deadline =
+                    hard_deadline(idle_policy, idle_state, session_started_at, downstream_ms);
+                if !idle_state.soft_idle_marked
+                    && now.saturating_duration_since(idle_state.last_client_frame_at)
+                        >= idle_policy.soft_idle
+                {
+                    idle_state.soft_idle_marked = true;
+                    if mark_relay_idle_candidate_in(shared, forensics.conn_id) {
+                        stats.increment_relay_idle_soft_mark_total();
+                    }
+                    info!(
+                        trace_id = format_args!("0x{:016x}", forensics.trace_id),
+                        conn_id = forensics.conn_id,
+                        user = %forensics.user,
+                        read_label,
+                        soft_idle_secs = idle_policy.soft_idle.as_secs(),
+                        hard_idle_secs = idle_policy.hard_idle.as_secs(),
+                        grace_secs = idle_policy.grace_after_downstream_activity.as_secs(),
+                        "Middle-relay soft idle mark"
+                    );
+                }
+
+                let soft_deadline = idle_state.last_client_frame_at + idle_policy.soft_idle;
+                let next_deadline = if idle_state.soft_idle_marked {
+                    hard_deadline
+                } else {
+                    soft_deadline.min(hard_deadline)
+                };
+                let mut remaining = next_deadline.saturating_duration_since(now);
+                if remaining.is_zero() {
+                    remaining = Duration::from_millis(1);
+                }
+                remaining.min(RELAY_IDLE_IO_POLL_MAX)
+            } else {
+                idle_policy.legacy_frame_read_timeout
+            };
+
+            let read_result = timeout(timeout_window, client_reader.read(&mut buf[filled..])).await;
+            match read_result {
+                Ok(Ok(0)) => {
+                    return Err(ProxyError::Io(std::io::Error::from(
+                        std::io::ErrorKind::UnexpectedEof,
+                    )));
+                }
+                Ok(Ok(n)) => {
+                    filled = filled.saturating_add(n);
+                }
+                Ok(Err(e)) => return Err(ProxyError::Io(e)),
+                Err(_) if !idle_policy.enabled => {
+                    return Err(ProxyError::Io(std::io::Error::new(
+                        std::io::ErrorKind::TimedOut,
+                        format!(
+                            "middle-relay client frame read timeout while reading {read_label}"
+                        ),
+                    )));
+                }
+                Err(_) => {
+                    let now = Instant::now();
+                    let downstream_ms = last_downstream_activity_ms.load(Ordering::Relaxed);
+                    let hard_deadline =
+                        hard_deadline(idle_policy, idle_state, session_started_at, downstream_ms);
+                    if now >= hard_deadline {
+                        clear_relay_idle_candidate_in(shared, forensics.conn_id);
+                        stats.increment_relay_idle_hard_close_total();
+                        let client_idle_secs = now
+                            .saturating_duration_since(idle_state.last_client_frame_at)
+                            .as_secs();
+                        let downstream_idle_secs = now
+                            .saturating_duration_since(
+                                session_started_at + Duration::from_millis(downstream_ms),
+                            )
+                            .as_secs();
+                        warn!(
+                            trace_id = format_args!("0x{:016x}", forensics.trace_id),
+                            conn_id = forensics.conn_id,
+                            user = %forensics.user,
+                            read_label,
+                            client_idle_secs,
+                            downstream_idle_secs,
+                            soft_idle_secs = idle_policy.soft_idle.as_secs(),
+                            hard_idle_secs = idle_policy.hard_idle.as_secs(),
+                            grace_secs = idle_policy.grace_after_downstream_activity.as_secs(),
+                            "Middle-relay hard idle close"
+                        );
+                        return Err(ProxyError::Io(std::io::Error::new(
+                            std::io::ErrorKind::TimedOut,
+                            format!(
+                                "middle-relay hard idle timeout while reading {read_label}: client_idle_secs={client_idle_secs}, downstream_idle_secs={downstream_idle_secs}, soft_idle_secs={}, hard_idle_secs={}, grace_secs={}",
+                                idle_policy.soft_idle.as_secs(),
+                                idle_policy.hard_idle.as_secs(),
+                                idle_policy.grace_after_downstream_activity.as_secs(),
+                            ),
+                        )));
+                    }
+                }
+            }
+        }
+
+        Ok(())
+    }
+
+    let mut consecutive_zero_len_frames = 0u32;
+    loop {
+        let (len, quickack, raw_len_bytes) = match proto_tag {
+            ProtoTag::Abridged => {
+                let mut first = [0u8; 1];
+                match read_exact_with_policy(
+                    client_reader,
+                    &mut first,
+                    idle_policy,
+                    idle_state,
+                    last_downstream_activity_ms,
+                    session_started_at,
+                    forensics,
+                    stats,
+                    shared,
+                    "abridged.first_len_byte",
+                )
+                .await
+                {
+                    Ok(()) => {}
+                    Err(ProxyError::Io(e)) if e.kind() == std::io::ErrorKind::UnexpectedEof => {
+                        return Ok(None);
+                    }
+                    Err(e) => return Err(e),
+                }
+
+                let quickack = (first[0] & 0x80) != 0;
+                let len_words = if (first[0] & 0x7f) == 0x7f {
+                    let mut ext = [0u8; 3];
+                    read_exact_with_policy(
+                        client_reader,
+                        &mut ext,
+                        idle_policy,
+                        idle_state,
+                        last_downstream_activity_ms,
+                        session_started_at,
+                        forensics,
+                        stats,
+                        shared,
+                        "abridged.extended_len",
+                    )
+                    .await?;
+                    u32::from_le_bytes([ext[0], ext[1], ext[2], 0]) as usize
+                } else {
+                    (first[0] & 0x7f) as usize
+                };
+
+                let len = len_words
+                    .checked_mul(4)
+                    .ok_or_else(|| ProxyError::Proxy("Abridged frame length overflow".into()))?;
+                (len, quickack, None)
+            }
+            ProtoTag::Intermediate | ProtoTag::Secure => {
+                let mut len_buf = [0u8; 4];
+                match read_exact_with_policy(
+                    client_reader,
+                    &mut len_buf,
+                    idle_policy,
+                    idle_state,
+                    last_downstream_activity_ms,
+                    session_started_at,
+                    forensics,
+                    stats,
+                    shared,
+                    "len_prefix",
+                )
+                .await
+                {
+                    Ok(()) => {}
+                    Err(ProxyError::Io(e)) if e.kind() == std::io::ErrorKind::UnexpectedEof => {
+                        return Ok(None);
+                    }
+                    Err(e) => return Err(e),
+                }
+                let quickack = (len_buf[3] & 0x80) != 0;
+                (
+                    (u32::from_le_bytes(len_buf) & 0x7fff_ffff) as usize,
+                    quickack,
+                    Some(len_buf),
+                )
+            }
+        };
+
+        if len == 0 {
+            idle_state.on_client_tiny_frame(Instant::now());
+            idle_state.tiny_frame_debt = idle_state
+                .tiny_frame_debt
+                .saturating_add(TINY_FRAME_DEBT_PER_TINY);
+            if idle_state.tiny_frame_debt >= TINY_FRAME_DEBT_LIMIT {
+                stats.increment_relay_protocol_desync_close_total();
+                return Err(ProxyError::Proxy(format!(
+                    "Tiny frame overhead limit exceeded: debt={}, conn_id={}",
+                    idle_state.tiny_frame_debt, forensics.conn_id
+                )));
+            }
+
+            if !idle_policy.enabled {
+                consecutive_zero_len_frames = consecutive_zero_len_frames.saturating_add(1);
+                if consecutive_zero_len_frames > LEGACY_MAX_CONSECUTIVE_ZERO_LEN_FRAMES {
+                    stats.increment_relay_protocol_desync_close_total();
+                    return Err(ProxyError::Proxy(
+                        "Excessive zero-length abridged frames".to_string(),
+                    ));
+                }
+            }
+            continue;
+        }
+        if len < 4 && proto_tag != ProtoTag::Abridged {
+            warn!(
+                trace_id = format_args!("0x{:016x}", forensics.trace_id),
+                conn_id = forensics.conn_id,
+                user = %forensics.user,
+                len,
+                proto = ?proto_tag,
+                "Frame too small — corrupt or probe"
+            );
+            stats.increment_relay_protocol_desync_close_total();
+            return Err(ProxyError::Proxy(format!("Frame too small: {len}")));
+        }
+
+        if len > max_frame {
+            return Err(report_desync_frame_too_large_in(
+                shared,
+                forensics,
+                proto_tag,
+                *frame_counter,
+                max_frame,
+                len,
+                raw_len_bytes,
+                stats,
+            ));
+        }
+
+        let secure_payload_len = if proto_tag == ProtoTag::Secure {
+            match secure_payload_len_from_wire_len(len) {
+                Some(payload_len) => payload_len,
+                None => {
+                    stats.increment_secure_padding_invalid();
+                    stats.increment_relay_protocol_desync_close_total();
+                    return Err(ProxyError::Proxy(format!(
+                        "Invalid secure frame length: {len}"
+                    )));
+                }
+            }
+        } else {
+            len
+        };
+
+        let mut payload = buffer_pool.get();
+        payload.clear();
+        let current_cap = payload.capacity();
+        if current_cap < len {
+            payload.reserve(len - current_cap);
+        }
+        payload.resize(len, 0);
+        read_exact_with_policy(
+            client_reader,
+            &mut payload[..len],
+            idle_policy,
+            idle_state,
+            last_downstream_activity_ms,
+            session_started_at,
+            forensics,
+            stats,
+            shared,
+            "payload",
+        )
+        .await?;
+
+        // Secure Intermediate: strip validated trailing padding bytes.
+        if proto_tag == ProtoTag::Secure {
+            payload.truncate(secure_payload_len);
+        }
+        *frame_counter += 1;
+        idle_state.on_client_frame(Instant::now());
+        idle_state.tiny_frame_debt = idle_state.tiny_frame_debt.saturating_sub(1);
+        clear_relay_idle_candidate_in(shared, forensics.conn_id);
+        return Ok(Some((payload, quickack)));
+    }
+}
+
+#[cfg(test)]
+pub(crate) async fn read_client_payload_with_idle_policy<R>(
+    client_reader: &mut CryptoReader<R>,
+    proto_tag: ProtoTag,
+    max_frame: usize,
+    buffer_pool: &Arc<BufferPool>,
+    forensics: &RelayForensicsState,
+    frame_counter: &mut u64,
+    stats: &Stats,
+    idle_policy: &RelayClientIdlePolicy,
+    idle_state: &mut RelayClientIdleState,
+    last_downstream_activity_ms: &AtomicU64,
+    session_started_at: Instant,
+) -> Result<Option<(PooledBuffer, bool)>>
+where
+    R: AsyncRead + Unpin + Send + 'static,
+{
+    let shared = ProxySharedState::new();
+    read_client_payload_with_idle_policy_in(
+        client_reader,
+        proto_tag,
+        max_frame,
+        buffer_pool,
+        forensics,
+        frame_counter,
+        stats,
+        shared.as_ref(),
+        idle_policy,
+        idle_state,
+        last_downstream_activity_ms,
+        session_started_at,
+    )
+    .await
+}
+
+#[cfg(test)]
+pub(crate) async fn read_client_payload_legacy<R>(
+    client_reader: &mut CryptoReader<R>,
+    proto_tag: ProtoTag,
+    max_frame: usize,
+    frame_read_timeout: Duration,
+    buffer_pool: &Arc<BufferPool>,
+    forensics: &RelayForensicsState,
+    frame_counter: &mut u64,
+    stats: &Stats,
+) -> Result<Option<(PooledBuffer, bool)>>
+where
+    R: AsyncRead + Unpin + Send + 'static,
+{
+    let now = Instant::now();
+    let shared = ProxySharedState::new();
+    let mut idle_state = RelayClientIdleState::new(now);
+    let last_downstream_activity_ms = AtomicU64::new(0);
+    let idle_policy = RelayClientIdlePolicy::disabled(frame_read_timeout);
+    read_client_payload_with_idle_policy_in(
+        client_reader,
+        proto_tag,
+        max_frame,
+        buffer_pool,
+        forensics,
+        frame_counter,
+        stats,
+        shared.as_ref(),
+        &idle_policy,
+        &mut idle_state,
+        &last_downstream_activity_ms,
+        now,
+    )
+    .await
+}
+
+#[cfg(test)]
+pub(crate) async fn read_client_payload<R>(
+    client_reader: &mut CryptoReader<R>,
+    proto_tag: ProtoTag,
+    max_frame: usize,
+    frame_read_timeout: Duration,
+    buffer_pool: &Arc<BufferPool>,
+    forensics: &RelayForensicsState,
+    frame_counter: &mut u64,
+    stats: &Stats,
+) -> Result<Option<(PooledBuffer, bool)>>
+where
+    R: AsyncRead + Unpin + Send + 'static,
+{
+    read_client_payload_legacy(
+        client_reader,
+        proto_tag,
+        max_frame,
+        frame_read_timeout,
+        buffer_pool,
+        forensics,
+        frame_counter,
+        stats,
+    )
+    .await
+}
@@ -0,0 +1,153 @@
+use super::*;
+
+pub(super) enum MiddleQuotaReserveError {
+    LimitExceeded,
+    Contended,
+    Cancelled,
+    DeadlineExceeded,
+}
+
+pub(super) fn quota_soft_cap(limit: u64, overshoot: u64) -> u64 {
+    limit.saturating_add(overshoot)
+}
+
+pub(super) async fn reserve_user_quota_with_yield(
+    user_stats: &UserStats,
+    bytes: u64,
+    limit: u64,
+    stats: &Stats,
+    cancel: &CancellationToken,
+    deadline: Option<Instant>,
+) -> std::result::Result<u64, MiddleQuotaReserveError> {
+    let mut backoff_ms = QUOTA_RESERVE_BACKOFF_MIN_MS;
+    let mut backoff_rounds = 0usize;
+    loop {
+        for _ in 0..QUOTA_RESERVE_SPIN_RETRIES {
+            match user_stats.quota_try_reserve(bytes, limit) {
+                Ok(total) => return Ok(total),
+                Err(QuotaReserveError::LimitExceeded) => {
+                    return Err(MiddleQuotaReserveError::LimitExceeded);
+                }
+                Err(QuotaReserveError::Contended) => {
+                    stats.increment_quota_contention_total();
+                    std::hint::spin_loop();
+                }
+            }
+        }
+
+        tokio::task::yield_now().await;
+        if deadline.is_some_and(|deadline| Instant::now() >= deadline) {
+            stats.increment_quota_contention_timeout_total();
+            return Err(MiddleQuotaReserveError::DeadlineExceeded);
+        }
+        tokio::select! {
+            biased;
+            _ = cancel.cancelled() => {
+                stats.increment_quota_acquire_cancelled_total();
+                return Err(MiddleQuotaReserveError::Cancelled);
+            }
+            _ = tokio::time::sleep(Duration::from_millis(backoff_ms)) => {}
+        }
+        backoff_rounds = backoff_rounds.saturating_add(1);
+        if backoff_rounds >= QUOTA_RESERVE_MAX_BACKOFF_ROUNDS {
+            stats.increment_quota_contention_timeout_total();
+            return Err(MiddleQuotaReserveError::Contended);
+        }
+        backoff_ms = backoff_ms
+            .saturating_mul(2)
+            .min(QUOTA_RESERVE_BACKOFF_MAX_MS);
+    }
+}
+
+pub(super) async fn wait_for_traffic_budget(
+    lease: Option<&Arc<TrafficLease>>,
+    direction: RateDirection,
+    bytes: u64,
+    deadline: Option<Instant>,
+) -> Result<()> {
+    if bytes == 0 {
+        return Ok(());
+    }
+    let Some(lease) = lease else {
+        return Ok(());
+    };
+
+    let mut remaining = bytes;
+    while remaining > 0 {
+        let consume = lease.try_consume(direction, remaining);
+        if consume.granted > 0 {
+            remaining = remaining.saturating_sub(consume.granted);
+            continue;
+        }
+
+        let wait_started_at = Instant::now();
+        if deadline.is_some_and(|deadline| wait_started_at >= deadline) {
+            return Err(ProxyError::TrafficBudgetWaitDeadlineExceeded);
+        }
+        tokio::time::sleep(next_refill_delay()).await;
+        let wait_ms = wait_started_at
+            .elapsed()
+            .as_millis()
+            .min(u128::from(u64::MAX)) as u64;
+        lease.observe_wait_ms(
+            direction,
+            consume.blocked_user,
+            consume.blocked_cidr,
+            wait_ms,
+        );
+    }
+
+    Ok(())
+}
+
+pub(super) async fn wait_for_traffic_budget_or_cancel(
+    lease: Option<&Arc<TrafficLease>>,
+    direction: RateDirection,
+    bytes: u64,
+    cancel: &CancellationToken,
+    stats: &Stats,
+    deadline: Option<Instant>,
+) -> Result<()> {
+    if bytes == 0 {
+        return Ok(());
+    }
+    let Some(lease) = lease else {
+        return Ok(());
+    };
+
+    let mut remaining = bytes;
+    while remaining > 0 {
+        let consume = lease.try_consume(direction, remaining);
+        if consume.granted > 0 {
+            remaining = remaining.saturating_sub(consume.granted);
+            continue;
+        }
+
+        let wait_started_at = Instant::now();
+        if deadline.is_some_and(|deadline| wait_started_at >= deadline) {
+            stats.increment_flow_wait_middle_rate_limit_cancelled_total();
+            return Err(ProxyError::TrafficBudgetWaitDeadlineExceeded);
+        }
+        tokio::select! {
+            biased;
+            _ = cancel.cancelled() => {
+                stats.increment_flow_wait_middle_rate_limit_cancelled_total();
+                return Err(ProxyError::TrafficBudgetWaitCancelled);
+            }
+            _ = tokio::time::sleep(next_refill_delay()) => {}
+        }
+        let wait_ms = wait_started_at
+            .elapsed()
+            .as_millis()
+            .min(u128::from(u64::MAX)) as u64;
+        lease.observe_wait_ms(
+            direction,
+            consume.blocked_user,
+            consume.blocked_cidr,
+            wait_ms,
+        );
+        stats.observe_flow_wait_middle_rate_limit_ms(wait_ms);
+    }
+
+    Ok(())
+}
@@ -0,0 +1,854 @@
+use super::*;
+
+pub(crate) async fn handle_via_middle_proxy<R, W>(
+    mut crypto_reader: CryptoReader<R>,
+    crypto_writer: CryptoWriter<W>,
+    success: HandshakeSuccess,
+    me_pool: Arc<MePool>,
+    stats: Arc<Stats>,
+    config: Arc<ProxyConfig>,
+    buffer_pool: Arc<BufferPool>,
+    local_addr: SocketAddr,
+    rng: Arc<SecureRandom>,
+    mut route_rx: watch::Receiver<RouteCutoverState>,
+    route_snapshot: RouteCutoverState,
+    session_id: u64,
+    session_cancel: CancellationToken,
+    shared: Arc<ProxySharedState>,
+) -> Result<()>
+where
+    R: AsyncRead + Unpin + Send + 'static,
+    W: AsyncWrite + Unpin + Send + 'static,
+{
+    let user = success.user.clone();
+    if session_cancel.is_cancelled() {
+        return Err(ProxyError::UserDisabled { user });
+    }
+
+    let quota_limit = config.access.user_data_quota.get(&user).copied();
+    let quota_user_stats = quota_limit.map(|_| stats.get_or_create_user_stats_handle(&user));
+    let peer = success.peer;
+    let traffic_lease = shared.traffic_limiter.acquire_lease(&user, peer.ip());
+    let proto_tag = success.proto_tag;
+    let pool_generation = me_pool.current_generation();
+
+    debug!(
+        user = %user,
+        peer = %peer,
+        dc = success.dc_idx,
+        proto = ?proto_tag,
+        mode = "middle_proxy",
+        pool_generation,
+        "Routing via Middle-End"
+    );
+
+    let (conn_id, me_rx) = me_pool.registry().register().await;
+    let trace_id = session_id;
+    let bytes_me2c = Arc::new(AtomicU64::new(0));
+    let mut forensics = RelayForensicsState {
+        trace_id,
+        conn_id,
+        user: user.clone(),
+        peer,
+        peer_hash: hash_ip_in(shared.as_ref(), peer.ip()),
+        started_at: Instant::now(),
+        bytes_c2me: 0,
+        bytes_me2c: bytes_me2c.clone(),
+        desync_all_full: config.general.desync_all_full,
+    };
+
+    stats.increment_user_connects(&user);
+    let _me_connection_lease = stats.acquire_me_connection_lease();
+
+    if let Some(cutover) =
+        affected_cutover_state(&route_rx, RelayRouteMode::Middle, route_snapshot.generation)
+    {
+        let delay = cutover_stagger_delay(session_id, cutover.generation);
+        warn!(
+            conn_id,
+            target_mode = cutover.mode.as_str(),
+            cutover_generation = cutover.generation,
+            delay_ms = delay.as_millis() as u64,
+            "Cutover affected middle session before relay start, closing client connection"
+        );
+        let _cutover_park_lease = stats.acquire_middle_cutover_park_lease();
+        tokio::time::sleep(delay).await;
+        let _ = me_pool.send_close(conn_id).await;
+        me_pool.registry().unregister(conn_id).await;
+        return Err(ProxyError::RouteSwitched);
+    }
+
+    // Per-user ad_tag from access.user_ad_tags; fallback to general.ad_tag (hot-reloadable)
+    let user_tag: Option<Vec<u8>> = config
+        .access
+        .user_ad_tags
+        .get(&user)
+        .and_then(|s| hex::decode(s).ok())
+        .filter(|v| v.len() == 16);
+    let global_tag: Option<Vec<u8>> = config
+        .general
+        .ad_tag
+        .as_ref()
+        .and_then(|s| hex::decode(s).ok())
+        .filter(|v| v.len() == 16);
+    let effective_tag = user_tag.or(global_tag);
+
+    let proto_flags = proto_flags_for_tag(proto_tag, effective_tag.is_some());
+    let effective_tag_array = effective_tag
+        .as_deref()
+        .and_then(|tag| <[u8; 16]>::try_from(tag).ok());
+    debug!(
+        trace_id = format_args!("0x{:016x}", trace_id),
+        user = %user,
+        conn_id,
+        peer_hash = format_args!("0x{:016x}", forensics.peer_hash),
+        desync_all_full = forensics.desync_all_full,
+        proto_flags = format_args!("0x{:08x}", proto_flags),
+        pool_generation,
+        "ME relay started"
+    );
+
+    let translated_local_addr = me_pool.translate_our_addr(local_addr);
+
+    let frame_limit = config.general.max_client_frame;
+    let mut relay_idle_policy = RelayClientIdlePolicy::from_config(&config);
+    let mut pressure_caps_applied = false;
+    if shared.conntrack_pressure_active() {
+        relay_idle_policy.apply_pressure_caps(config.server.conntrack_control.profile);
+        pressure_caps_applied = true;
+    }
+    let session_started_at = forensics.started_at;
+    let mut relay_idle_state = RelayClientIdleState::new(session_started_at);
+    let last_downstream_activity_ms = Arc::new(AtomicU64::new(0));
+
+    let c2me_channel_capacity = config
+        .general
+        .me_c2me_channel_capacity
+        .max(C2ME_CHANNEL_CAPACITY_FALLBACK);
+    let c2me_send_timeout = match config.general.me_c2me_send_timeout_ms {
+        0 => None,
+        timeout_ms => Some(Duration::from_millis(timeout_ms)),
+    };
+    let c2me_byte_budget = c2me_queued_permit_budget(c2me_channel_capacity, frame_limit);
+    let c2me_byte_semaphore = Arc::new(Semaphore::new(c2me_byte_budget));
+    let (c2me_tx, mut c2me_rx) = mpsc::channel::<C2MeCommand>(c2me_channel_capacity);
+    let me_pool_c2me = me_pool.clone();
+    let mut c2me_sender = tokio::spawn(async move {
+        let mut sent_since_yield = 0usize;
+        while let Some(cmd) = c2me_rx.recv().await {
+            match cmd {
+                C2MeCommand::Data {
+                    payload,
+                    flags,
+                    _permit,
+                } => {
+                    me_pool_c2me
+                        .send_proxy_req_pooled(
+                            conn_id,
+                            success.dc_idx,
+                            peer,
+                            translated_local_addr,
+                            payload,
+                            flags,
+                            effective_tag_array,
+                        )
+                        .await?;
+                    sent_since_yield = sent_since_yield.saturating_add(1);
+                    if should_yield_c2me_sender(sent_since_yield, !c2me_rx.is_empty()) {
+                        sent_since_yield = 0;
+                        tokio::task::yield_now().await;
+                    }
+                }
+                C2MeCommand::Close => {
+                    let _ = me_pool_c2me.send_close(conn_id).await;
+                    return Ok(());
+                }
+            }
+        }
+        Ok(())
+    });
+
+    let (stop_tx, mut stop_rx) = oneshot::channel::<()>();
+    let flow_cancel = CancellationToken::new();
+    let mut me_rx_task = me_rx;
+    let stats_clone = stats.clone();
+    let rng_clone = rng.clone();
+    let user_clone = user.clone();
+    let quota_user_stats_me_writer = quota_user_stats.clone();
+    let traffic_lease_me_writer = traffic_lease.clone();
+    let flow_cancel_me_writer = flow_cancel.clone();
+    let last_downstream_activity_ms_clone = last_downstream_activity_ms.clone();
+    let bytes_me2c_clone = bytes_me2c.clone();
+    let d2c_flush_policy = MeD2cFlushPolicy::from_config(&config);
+    let mut me_writer = tokio::spawn(async move {
+        let mut writer = crypto_writer;
+        let mut frame_buf = Vec::with_capacity(16 * 1024);
+        let shrink_threshold = d2c_flush_policy.frame_buf_shrink_threshold_bytes;
+
+        fn shrink_session_vec(buf: &mut Vec<u8>, threshold: usize) {
+            if buf.capacity() > threshold {
+                buf.clear();
+                buf.shrink_to(threshold);
+            } else {
+                buf.clear();
+            }
+        }
+
+        loop {
+            tokio::select! {
+                msg = me_rx_task.recv() => {
+                    let Some(first) = msg else {
+                        debug!(conn_id, "ME channel closed");
+                        shrink_session_vec(&mut frame_buf, shrink_threshold);
+                        return Err(ProxyError::MiddleConnectionLost);
+                    };
+
+                    let mut batch_frames = 0usize;
+                    let mut batch_bytes = 0usize;
+                    let mut flush_immediately;
+                    let mut max_delay_fired = false;
+
+                    let first_is_downstream_activity =
+                        matches!(&first, MeResponse::Data { .. } | MeResponse::Ack(_));
+                    match process_me_writer_response_with_traffic_lease(
+                        first,
+                        &mut writer,
+                        proto_tag,
+                        rng_clone.as_ref(),
+                        &mut frame_buf,
+                        stats_clone.as_ref(),
+                        &user_clone,
+                        quota_user_stats_me_writer.as_deref(),
+                        quota_limit,
+                        d2c_flush_policy.quota_soft_overshoot_bytes,
+                        traffic_lease_me_writer.as_ref(),
+                        &flow_cancel_me_writer,
+                        bytes_me2c_clone.as_ref(),
+                        conn_id,
+                        d2c_flush_policy.ack_flush_immediate,
+                        false,
+                    ).await? {
+                        MeWriterResponseOutcome::Continue { frames, bytes, flush_immediately: immediate } => {
+                            if first_is_downstream_activity {
+                                last_downstream_activity_ms_clone
+                                    .store(session_started_at.elapsed().as_millis() as u64, Ordering::Relaxed);
+                            }
+                            batch_frames = batch_frames.saturating_add(frames);
+                            batch_bytes = batch_bytes.saturating_add(bytes);
+                            flush_immediately = immediate;
+                        }
+                        MeWriterResponseOutcome::Close => {
+                            let flush_started_at = if stats_clone.telemetry_policy().me_level.allows_debug() {
+                                Some(Instant::now())
+                            } else {
+                                None
+                            };
+                            let _ = flush_client_or_cancel(&mut writer, &flow_cancel_me_writer).await;
+                            let flush_duration_us = flush_started_at.map(|started| {
+                                started
+                                    .elapsed()
+                                    .as_micros()
+                                    .min(u128::from(u64::MAX)) as u64
+                            });
+                            observe_me_d2c_flush_event(
+                                stats_clone.as_ref(),
+                                MeD2cFlushReason::Close,
+                                batch_frames,
+                                batch_bytes,
+                                flush_duration_us,
+                            );
+                            shrink_session_vec(&mut frame_buf, shrink_threshold);
+                            return Ok(());
+                        }
+                    }
+
+                    while !flush_immediately
+                        && batch_frames < d2c_flush_policy.max_frames
+                        && batch_bytes < d2c_flush_policy.max_bytes
+                    {
+                        let Ok(next) = me_rx_task.try_recv() else {
+                            break;
+                        };
+
+                        let next_is_downstream_activity =
+                            matches!(&next, MeResponse::Data { .. } | MeResponse::Ack(_));
+                        match process_me_writer_response_with_traffic_lease(
+                            next,
+                            &mut writer,
+                            proto_tag,
+                            rng_clone.as_ref(),
+                            &mut frame_buf,
+                            stats_clone.as_ref(),
+                            &user_clone,
+                            quota_user_stats_me_writer.as_deref(),
+                            quota_limit,
+                            d2c_flush_policy.quota_soft_overshoot_bytes,
+                            traffic_lease_me_writer.as_ref(),
+                            &flow_cancel_me_writer,
+                            bytes_me2c_clone.as_ref(),
+                            conn_id,
+                            d2c_flush_policy.ack_flush_immediate,
+                            true,
+                        ).await? {
+                            MeWriterResponseOutcome::Continue { frames, bytes, flush_immediately: immediate } => {
+                                if next_is_downstream_activity {
+                                    last_downstream_activity_ms_clone
+                                        .store(session_started_at.elapsed().as_millis() as u64, Ordering::Relaxed);
+                                }
+                                batch_frames = batch_frames.saturating_add(frames);
+                                batch_bytes = batch_bytes.saturating_add(bytes);
+                                flush_immediately |= immediate;
+                            }
+                            MeWriterResponseOutcome::Close => {
+                                let flush_started_at =
+                                    if stats_clone.telemetry_policy().me_level.allows_debug() {
+                                        Some(Instant::now())
+                                    } else {
+                                        None
+                                    };
+                                let _ =
+                                    flush_client_or_cancel(&mut writer, &flow_cancel_me_writer).await;
+                                let flush_duration_us = flush_started_at.map(|started| {
+                                    started
+                                        .elapsed()
+                                        .as_micros()
+                                        .min(u128::from(u64::MAX))
+                                        as u64
+                                });
+                                observe_me_d2c_flush_event(
+                                    stats_clone.as_ref(),
+                                    MeD2cFlushReason::Close,
+                                    batch_frames,
+                                    batch_bytes,
+                                    flush_duration_us,
+                                );
+                                shrink_session_vec(&mut frame_buf, shrink_threshold);
+                                return Ok(());
+                            }
+                        }
+                    }
+
+                    if !flush_immediately
+                        && !d2c_flush_policy.max_delay.is_zero()
+                        && batch_frames < d2c_flush_policy.max_frames
+                        && batch_bytes < d2c_flush_policy.max_bytes
+                    {
+                        stats_clone.increment_me_d2c_batch_timeout_armed_total();
+                        match tokio::time::timeout(d2c_flush_policy.max_delay, me_rx_task.recv()).await {
+                            Ok(Some(next)) => {
+                                let next_is_downstream_activity =
+                                    matches!(&next, MeResponse::Data { .. } | MeResponse::Ack(_));
+                                match process_me_writer_response_with_traffic_lease(
+                                    next,
+                                    &mut writer,
+                                    proto_tag,
+                                    rng_clone.as_ref(),
+                                    &mut frame_buf,
+                                    stats_clone.as_ref(),
+                                    &user_clone,
+                                    quota_user_stats_me_writer.as_deref(),
+                                    quota_limit,
+                                    d2c_flush_policy.quota_soft_overshoot_bytes,
+                                    traffic_lease_me_writer.as_ref(),
+                                    &flow_cancel_me_writer,
+                                    bytes_me2c_clone.as_ref(),
+                                    conn_id,
+                                    d2c_flush_policy.ack_flush_immediate,
+                                    true,
+                                ).await? {
+                                    MeWriterResponseOutcome::Continue { frames, bytes, flush_immediately: immediate } => {
+                                        if next_is_downstream_activity {
+                                            last_downstream_activity_ms_clone
+                                                .store(session_started_at.elapsed().as_millis() as u64, Ordering::Relaxed);
+                                        }
+                                        batch_frames = batch_frames.saturating_add(frames);
+                                        batch_bytes = batch_bytes.saturating_add(bytes);
+                                        flush_immediately |= immediate;
+                                    }
+                                    MeWriterResponseOutcome::Close => {
+                                        let flush_started_at = if stats_clone
+                                            .telemetry_policy()
+                                            .me_level
+                                            .allows_debug()
+                                        {
+                                            Some(Instant::now())
+                                        } else {
+                                            None
+                                        };
+                                        let _ = flush_client_or_cancel(
+                                            &mut writer,
+                                            &flow_cancel_me_writer,
+                                        )
+                                        .await;
+                                        let flush_duration_us = flush_started_at.map(|started| {
+                                            started
+                                                .elapsed()
+                                                .as_micros()
+                                                .min(u128::from(u64::MAX))
+                                                as u64
+                                        });
+                                        observe_me_d2c_flush_event(
+                                            stats_clone.as_ref(),
+                                            MeD2cFlushReason::Close,
+                                            batch_frames,
+                                            batch_bytes,
+                                            flush_duration_us,
+                                        );
+                                        shrink_session_vec(&mut frame_buf, shrink_threshold);
+                                        return Ok(());
+                                    }
+                                }
+
+                                while !flush_immediately
+                                    && batch_frames < d2c_flush_policy.max_frames
+                                    && batch_bytes < d2c_flush_policy.max_bytes
+                                {
+                                    let Ok(extra) = me_rx_task.try_recv() else {
+                                        break;
+                                    };
+
+                                    let extra_is_downstream_activity =
+                                        matches!(&extra, MeResponse::Data { .. } | MeResponse::Ack(_));
+                                    match process_me_writer_response_with_traffic_lease(
+                                        extra,
+                                        &mut writer,
+                                        proto_tag,
+                                        rng_clone.as_ref(),
+                                        &mut frame_buf,
+                                        stats_clone.as_ref(),
+                                        &user_clone,
+                                        quota_user_stats_me_writer.as_deref(),
+                                        quota_limit,
+                                        d2c_flush_policy.quota_soft_overshoot_bytes,
+                                        traffic_lease_me_writer.as_ref(),
+                                        &flow_cancel_me_writer,
+                                        bytes_me2c_clone.as_ref(),
+                                        conn_id,
+                                        d2c_flush_policy.ack_flush_immediate,
+                                        true,
+                                    ).await? {
+                                        MeWriterResponseOutcome::Continue { frames, bytes, flush_immediately: immediate } => {
+                                            if extra_is_downstream_activity {
+                                                last_downstream_activity_ms_clone
+                                                    .store(session_started_at.elapsed().as_millis() as u64, Ordering::Relaxed);
+                                            }
+                                            batch_frames = batch_frames.saturating_add(frames);
+                                            batch_bytes = batch_bytes.saturating_add(bytes);
+                                            flush_immediately |= immediate;
+                                        }
+                                        MeWriterResponseOutcome::Close => {
+                                            let flush_started_at = if stats_clone
+                                                .telemetry_policy()
+                                                .me_level
+                                                .allows_debug()
+                                            {
+                                                Some(Instant::now())
+                                            } else {
+                                                None
+                                            };
+                                            let _ = flush_client_or_cancel(
+                                                &mut writer,
+                                                &flow_cancel_me_writer,
+                                            )
+                                            .await;
+                                            let flush_duration_us = flush_started_at.map(|started| {
+                                                started
+                                                    .elapsed()
+                                                    .as_micros()
+                                                    .min(u128::from(u64::MAX))
+                                                    as u64
+                                            });
+                                            observe_me_d2c_flush_event(
+                                                stats_clone.as_ref(),
+                                                MeD2cFlushReason::Close,
+                                                batch_frames,
+                                                batch_bytes,
+                                                flush_duration_us,
+                                            );
+                                            shrink_session_vec(&mut frame_buf, shrink_threshold);
+                                            return Ok(());
+                                        }
+                                    }
+                                }
+                            }
+                            Ok(None) => {
+                                debug!(conn_id, "ME channel closed");
+                                shrink_session_vec(&mut frame_buf, shrink_threshold);
+                                return Err(ProxyError::MiddleConnectionLost);
+                            }
+                            Err(_) => {
+                                max_delay_fired = true;
+                                stats_clone.increment_me_d2c_batch_timeout_fired_total();
+                            }
+                        }
+                    }
+
+                    let flush_reason = classify_me_d2c_flush_reason(
+                        flush_immediately,
+                        batch_frames,
+                        d2c_flush_policy.max_frames,
+                        batch_bytes,
+                        d2c_flush_policy.max_bytes,
+                        max_delay_fired,
+                    );
+                    let flush_started_at = if stats_clone.telemetry_policy().me_level.allows_debug() {
+                        Some(Instant::now())
+                    } else {
+                        None
+                    };
+                    flush_client_or_cancel(&mut writer, &flow_cancel_me_writer).await?;
+                    let flush_duration_us = flush_started_at.map(|started| {
+                        started
+                            .elapsed()
+                            .as_micros()
+                            .min(u128::from(u64::MAX)) as u64
+                    });
+                    observe_me_d2c_flush_event(
+                        stats_clone.as_ref(),
+                        flush_reason,
+                        batch_frames,
+                        batch_bytes,
+                        flush_duration_us,
+                    );
+                    let shrink_threshold = d2c_flush_policy.frame_buf_shrink_threshold_bytes;
+                    let shrink_trigger = shrink_threshold
+                        .saturating_mul(ME_D2C_FRAME_BUF_SHRINK_HYSTERESIS_FACTOR);
+                    if frame_buf.capacity() > shrink_trigger {
+                        let cap_before = frame_buf.capacity();
+                        frame_buf.shrink_to(shrink_threshold);
+                        let cap_after = frame_buf.capacity();
+                        let bytes_freed = cap_before.saturating_sub(cap_after) as u64;
+                        stats_clone.observe_me_d2c_frame_buf_shrink(bytes_freed);
+                    }
+                }
+                _ = &mut stop_rx => {
+                    debug!(conn_id, "ME writer stop signal");
+                    shrink_session_vec(&mut frame_buf, shrink_threshold);
+                    return Ok(());
+                }
+            }
+        }
+    });
+
+    let mut main_result: Result<()> = Ok(());
+    let mut client_closed = false;
+    let mut frame_counter: u64 = 0;
+    let mut route_watch_open = true;
+    let mut seen_pressure_seq = relay_pressure_event_seq_in(shared.as_ref());
+    loop {
+        if shared.conntrack_pressure_active() && !pressure_caps_applied {
+            relay_idle_policy.apply_pressure_caps(config.server.conntrack_control.profile);
+            pressure_caps_applied = true;
+        }
+
+        if relay_idle_policy.enabled
+            && maybe_evict_idle_candidate_on_pressure_in(
+                shared.as_ref(),
+                conn_id,
+                &mut seen_pressure_seq,
+                stats.as_ref(),
+            )
+        {
+            info!(
+                conn_id,
+                trace_id = format_args!("0x{:016x}", trace_id),
+                user = %user,
+                "Middle-relay pressure eviction for idle-candidate session"
+            );
+            let _ = enqueue_c2me_command_in(
+                shared.as_ref(),
+                &c2me_tx,
+                C2MeCommand::Close,
+                c2me_send_timeout,
+                stats.as_ref(),
+            )
+            .await;
+            main_result = Err(ProxyError::Proxy(
+                "middle-relay session evicted under pressure (idle-candidate)".to_string(),
+            ));
+            break;
+        }
+
+        if let Some(cutover) =
+            affected_cutover_state(&route_rx, RelayRouteMode::Middle, route_snapshot.generation)
+        {
+            let delay = cutover_stagger_delay(session_id, cutover.generation);
+            warn!(
+                conn_id,
+                target_mode = cutover.mode.as_str(),
+                cutover_generation = cutover.generation,
+                delay_ms = delay.as_millis() as u64,
+                "Cutover affected middle session, closing client connection"
+            );
+            let _cutover_park_lease = stats.acquire_middle_cutover_park_lease();
+            tokio::time::sleep(delay).await;
+            let _ = enqueue_c2me_command_in(
+                shared.as_ref(),
+                &c2me_tx,
+                C2MeCommand::Close,
+                c2me_send_timeout,
+                stats.as_ref(),
+            )
+            .await;
+            main_result = Err(ProxyError::RouteSwitched);
+            break;
+        }
+
+        tokio::select! {
+            _ = session_cancel.cancelled() => {
+                warn!(
+                    user = %user,
+                    conn_id,
+                    "Disabled user middle session cancelled"
+                );
+                let _ = enqueue_c2me_command_in(
+                    shared.as_ref(),
+                    &c2me_tx,
+                    C2MeCommand::Close,
+                    c2me_send_timeout,
+                    stats.as_ref(),
+                )
+                .await;
+                main_result = Err(ProxyError::UserDisabled {
+                    user: user.clone(),
+                });
+                break;
+            }
+            changed = route_rx.changed(), if route_watch_open => {
+                if changed.is_err() {
+                    route_watch_open = false;
+                }
+            }
+            payload_result = read_client_payload_with_idle_policy_in(
+                &mut crypto_reader,
+                proto_tag,
+                frame_limit,
+                &buffer_pool,
+                &forensics,
+                &mut frame_counter,
+                &stats,
+                shared.as_ref(),
+                &relay_idle_policy,
+                &mut relay_idle_state,
+                last_downstream_activity_ms.as_ref(),
+                session_started_at,
+            ) => {
+                match payload_result {
+                    Ok(Some((payload, quickack))) => {
+                        trace!(conn_id, bytes = payload.len(), "C->ME frame");
+                        wait_for_traffic_budget(
+                            traffic_lease.as_ref(),
+                            RateDirection::Up,
+                            payload.len() as u64,
+                            None,
+                        )
+                        .await?;
+                        forensics.bytes_c2me = forensics
+                            .bytes_c2me
+                            .saturating_add(payload.len() as u64);
+                        if let (Some(limit), Some(user_stats)) =
+                            (quota_limit, quota_user_stats.as_deref())
+                        {
+                            match reserve_user_quota_with_yield(
+                                user_stats,
+                                payload.len() as u64,
+                                limit,
+                                stats.as_ref(),
+                                &flow_cancel,
+                                None,
+                            )
+                            .await
+                            {
+                                Ok(_) => {}
+                                Err(MiddleQuotaReserveError::LimitExceeded) => {
+                                    main_result = Err(ProxyError::DataQuotaExceeded {
+                                        user: user.clone(),
+                                    });
+                                    break;
+                                }
+                                Err(MiddleQuotaReserveError::Contended) => {
+                                    main_result = Err(ProxyError::Proxy(
+                                        "ME C->ME quota reservation contended".into(),
+                                    ));
+                                    break;
+                                }
+                                Err(MiddleQuotaReserveError::Cancelled) => {
+                                    main_result = Err(ProxyError::Proxy(
+                                        "ME C->ME quota reservation cancelled".into(),
+                                    ));
+                                    break;
+                                }
+                                Err(MiddleQuotaReserveError::DeadlineExceeded) => {
+                                    main_result = Err(ProxyError::Proxy(
+                                        "ME C->ME quota reservation deadline exceeded".into(),
+                                    ));
+                                    break;
+                                }
+                            }
+                            stats.add_user_octets_from_handle(user_stats, payload.len() as u64);
+                        } else {
+                            stats.add_user_octets_from(&user, payload.len() as u64);
+                        }
+                        let mut flags = proto_flags;
+                        if quickack {
+                            flags |= RPC_FLAG_QUICKACK;
+                        }
+                        if payload.len() >= 8 && payload[..8].iter().all(|b| *b == 0) {
+                            flags |= RPC_FLAG_NOT_ENCRYPTED;
+                        }
+                        let payload_permit = match acquire_c2me_payload_permit(
+                            &c2me_byte_semaphore,
+                            payload.len(),
+                            c2me_send_timeout,
+                            stats.as_ref(),
+                        )
+                        .await
+                        {
+                            Ok(permit) => permit,
+                            Err(e) => {
+                                main_result = Err(e);
+                                break;
+                            }
+                        };
+                        // Keep client read loop lightweight: route heavy ME send path via a dedicated task.
+                        if enqueue_c2me_command_in(
+                            shared.as_ref(),
+                            &c2me_tx,
+                            C2MeCommand::Data {
+                                payload,
+                                flags,
+                                _permit: payload_permit,
+                            },
+                            c2me_send_timeout,
+                            stats.as_ref(),
+                        )
+                        .await
+                            .is_err()
+                        {
+                            main_result = Err(ProxyError::Proxy("ME sender channel closed".into()));
+                            break;
+                        }
+                    }
+                    Ok(None) => {
+                        debug!(conn_id, "Client EOF");
+                        client_closed = true;
+                        let _ = enqueue_c2me_command_in(
+                            shared.as_ref(),
+                            &c2me_tx,
+                            C2MeCommand::Close,
+                            c2me_send_timeout,
+                            stats.as_ref(),
+                        )
+                        .await;
+                        break;
+                    }
+                    Err(e) => {
+                        main_result = Err(e);
+                        break;
+                    }
+                }
+            }
+        }
+    }
+
+    drop(c2me_tx);
+    let c2me_result = match timeout(ME_CHILD_JOIN_TIMEOUT, &mut c2me_sender).await {
+        Ok(joined) => {
+            joined.unwrap_or_else(|e| Err(ProxyError::Proxy(format!("ME sender join error: {e}"))))
+        }
+        Err(_) => {
+            stats.increment_me_child_join_timeout_total();
+            stats.increment_me_child_abort_total();
+            c2me_sender.abort();
+            Err(ProxyError::Proxy("ME sender join timeout".into()))
+        }
+    };
+
+    flow_cancel.cancel();
+    let _ = stop_tx.send(());
+    let mut writer_result = match timeout(ME_CHILD_JOIN_TIMEOUT, &mut me_writer).await {
+        Ok(joined) => {
+            joined.unwrap_or_else(|e| Err(ProxyError::Proxy(format!("ME writer join error: {e}"))))
+        }
+        Err(_) => {
+            stats.increment_me_child_join_timeout_total();
+            stats.increment_me_child_abort_total();
+            me_writer.abort();
+            Err(ProxyError::Proxy("ME writer join timeout".into()))
+        }
+    };
+
+    // When client closes, but ME channel stopped as unregistered - it isnt error
+    if client_closed && matches!(writer_result, Err(ProxyError::MiddleConnectionLost)) {
+        writer_result = Ok(());
+    }
+
+    let result = match (main_result, c2me_result, writer_result) {
+        (Ok(()), Ok(()), Ok(())) => Ok(()),
+        (Err(e), _, _) => Err(e),
+        (_, Err(e), _) => Err(e),
+        (_, _, Err(e)) => Err(e),
+    };
+
+    debug!(
+        user = %user,
+        conn_id,
+        trace_id = format_args!("0x{:016x}", trace_id),
+        duration_ms = forensics.started_at.elapsed().as_millis() as u64,
+        bytes_c2me = forensics.bytes_c2me,
+        bytes_me2c = forensics.bytes_me2c.load(Ordering::Relaxed),
+        frames_ok = frame_counter,
+        "ME relay cleanup"
+    );
+
+    let close_reason = classify_conntrack_close_reason(&result);
+    let publish_result = shared.publish_conntrack_close_event(ConntrackCloseEvent {
+        src: peer,
+        dst: local_addr,
+        reason: close_reason,
+    });
+    if !matches!(
+        publish_result,
+        ConntrackClosePublishResult::Sent | ConntrackClosePublishResult::Disabled
+    ) {
+        stats.increment_conntrack_close_event_drop_total();
+    }
+
+    clear_relay_idle_candidate_in(shared.as_ref(), conn_id);
+    me_pool.registry().unregister(conn_id).await;
+    buffer_pool.trim_to(buffer_pool.max_buffers().min(64));
+    let pool_snapshot = buffer_pool.stats();
+    stats.set_buffer_pool_gauges(
+        pool_snapshot.pooled,
+        pool_snapshot.allocated,
+        pool_snapshot.allocated.saturating_sub(pool_snapshot.pooled),
+    );
+    result
+}
+
+fn classify_conntrack_close_reason(result: &Result<()>) -> ConntrackCloseReason {
+    match result {
+        Ok(()) => ConntrackCloseReason::NormalEof,
+        Err(ProxyError::Io(error)) if matches!(error.kind(), std::io::ErrorKind::TimedOut) => {
+            ConntrackCloseReason::Timeout
+        }
+        Err(ProxyError::Io(error))
+            if matches!(
+                error.kind(),
+                std::io::ErrorKind::ConnectionReset
+                    | std::io::ErrorKind::ConnectionAborted
+                    | std::io::ErrorKind::BrokenPipe
+                    | std::io::ErrorKind::NotConnected
+                    | std::io::ErrorKind::UnexpectedEof
+            ) =>
+        {
+            ConntrackCloseReason::Reset
+        }
+        Err(ProxyError::Proxy(message))
+            if message.contains("pressure") || message.contains("evicted") =>
+        {
+            ConntrackCloseReason::Pressure
+        }
+        Err(_) => ConntrackCloseReason::Other,
+    }
+}
@@ -52,18 +52,17 @@
 //! - `SharedCounters` (atomics) let the watchdog read stats without locking

 use crate::error::{ProxyError, Result};
-use crate::proxy::traffic_limiter::{RateDirection, TrafficLease, next_refill_delay};
-use crate::stats::{Stats, UserStats};
+use crate::proxy::traffic_limiter::TrafficLease;
+use crate::stats::Stats;
 use crate::stream::BufferPool;
-use std::io;
-use std::pin::Pin;
+use std::future::pending;
 use std::sync::Arc;
-use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
-use std::task::{Context, Poll};
+use std::sync::atomic::{AtomicBool, Ordering};
 use std::time::Duration;
-use tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt, ReadBuf, copy_bidirectional_with_sizes};
-use tokio::time::{Instant, Sleep};
-use tracing::{debug, trace, warn};
+use tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt, copy_bidirectional_with_sizes};
+use tokio::time::Instant;
+use tokio_util::sync::CancellationToken;
+use tracing::{debug, warn};

 // ============= Constants =============

@@ -85,704 +84,11 @@ fn watchdog_delta(current: u64, previous: u64) -> u64 {
    current.saturating_sub(previous)
 }

-// ============= CombinedStream =============
-
-/// Combines separate read and write halves into a single bidirectional stream.
-///
-/// `copy_bidirectional` requires `AsyncRead + AsyncWrite` on each side,
-/// but the handshake layer produces split reader/writer pairs
-/// (e.g. `CryptoReader<FakeTlsReader<OwnedReadHalf>>` + `CryptoWriter<...>`).
-///
-/// This wrapper reunifies them with zero overhead — each trait method
-/// delegates directly to the corresponding half. No buffering, no copies.
-///
-/// Safety: `poll_read` only touches `reader`, `poll_write` only touches `writer`,
-/// so there's no aliasing even though both are called on the same `&mut self`.
-struct CombinedStream<R, W> {
-    reader: R,
-    writer: W,
-}
-
-impl<R, W> CombinedStream<R, W> {
-    fn new(reader: R, writer: W) -> Self {
-        Self { reader, writer }
-    }
-}
-
-impl<R: AsyncRead + Unpin, W: Unpin> AsyncRead for CombinedStream<R, W> {
-    #[inline]
-    fn poll_read(
-        self: Pin<&mut Self>,
-        cx: &mut Context<'_>,
-        buf: &mut ReadBuf<'_>,
-    ) -> Poll<io::Result<()>> {
-        Pin::new(&mut self.get_mut().reader).poll_read(cx, buf)
-    }
-}
-
-impl<R: Unpin, W: AsyncWrite + Unpin> AsyncWrite for CombinedStream<R, W> {
-    #[inline]
-    fn poll_write(
-        self: Pin<&mut Self>,
-        cx: &mut Context<'_>,
-        buf: &[u8],
-    ) -> Poll<io::Result<usize>> {
-        Pin::new(&mut self.get_mut().writer).poll_write(cx, buf)
-    }
-
-    #[inline]
-    fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
-        Pin::new(&mut self.get_mut().writer).poll_flush(cx)
-    }
-
-    #[inline]
-    fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
-        Pin::new(&mut self.get_mut().writer).poll_shutdown(cx)
-    }
-}
-
-// ============= SharedCounters =============
-
-/// Atomic counters shared between the relay (via StatsIo) and the watchdog task.
-///
-/// Using `Relaxed` ordering is sufficient because:
-/// - Counters are monotonically increasing (no ABA problem)
-/// - Slight staleness in watchdog reads is harmless (±10s check interval anyway)
-/// - No ordering dependencies between different counters
-struct SharedCounters {
-    /// Bytes read from client (C→S direction)
-    c2s_bytes: AtomicU64,
-    /// Bytes written to client (S→C direction)
-    s2c_bytes: AtomicU64,
-    /// Number of poll_read completions (≈ C→S chunks)
-    c2s_ops: AtomicU64,
-    /// Number of poll_write completions (≈ S→C chunks)
-    s2c_ops: AtomicU64,
-    /// Milliseconds since relay epoch of last I/O activity
-    last_activity_ms: AtomicU64,
-}
-
-impl SharedCounters {
-    fn new() -> Self {
-        Self {
-            c2s_bytes: AtomicU64::new(0),
-            s2c_bytes: AtomicU64::new(0),
-            c2s_ops: AtomicU64::new(0),
-            s2c_ops: AtomicU64::new(0),
-            last_activity_ms: AtomicU64::new(0),
-        }
-    }
-
-    /// Record activity at this instant.
-    #[inline]
-    fn touch(&self, now: Instant, epoch: Instant) {
-        let ms = now.duration_since(epoch).as_millis() as u64;
-        self.last_activity_ms.store(ms, Ordering::Relaxed);
-    }
-
-    /// How long since last recorded activity.
-    fn idle_duration(&self, now: Instant, epoch: Instant) -> Duration {
-        let last_ms = self.last_activity_ms.load(Ordering::Relaxed);
-        let now_ms = now.duration_since(epoch).as_millis() as u64;
-        Duration::from_millis(now_ms.saturating_sub(last_ms))
-    }
-}
-
-// ============= StatsIo =============
-
-/// Transparent I/O wrapper that tracks per-user statistics and activity.
-///
-/// Wraps the **client** side of the relay. Direction mapping:
-///
-/// | poll method  | direction | stats updated                        |
-/// |-------------|-----------|--------------------------------------|
-/// | `poll_read`  | C→S       | `octets_from`, `msgs_from`, counters |
-/// | `poll_write` | S→C       | `octets_to`, `msgs_to`, counters     |
-///
-/// Both update the shared activity timestamp for the watchdog.
-///
-/// Note on message counts: the original code counted one `read()`/`write_all()`
-/// as one "message". Here we count `poll_read`/`poll_write` completions instead.
-/// Byte counts are identical; op counts may differ slightly due to different
-/// internal buffering in `copy_bidirectional`. This is fine for monitoring.
-struct StatsIo<S> {
-    inner: S,
-    counters: Arc<SharedCounters>,
-    stats: Arc<Stats>,
-    user: String,
-    user_stats: Arc<UserStats>,
-    traffic_lease: Option<Arc<TrafficLease>>,
-    c2s_rate_debt_bytes: u64,
-    c2s_wait: RateWaitState,
-    s2c_wait: RateWaitState,
-    quota_wait: RateWaitState,
-    quota_limit: Option<u64>,
-    quota_exceeded: Arc<AtomicBool>,
-    quota_bytes_since_check: u64,
-    epoch: Instant,
-}
-
-#[derive(Default)]
-struct RateWaitState {
-    sleep: Option<Pin<Box<Sleep>>>,
-    started_at: Option<Instant>,
-    blocked_user: bool,
-    blocked_cidr: bool,
-}
-
-impl<S> StatsIo<S> {
-    #[cfg(test)]
-    fn new(
-        inner: S,
-        counters: Arc<SharedCounters>,
-        stats: Arc<Stats>,
-        user: String,
-        quota_limit: Option<u64>,
-        quota_exceeded: Arc<AtomicBool>,
-        epoch: Instant,
-    ) -> Self {
-        Self::new_with_traffic_lease(
-            inner,
-            counters,
-            stats,
-            user,
-            None,
-            quota_limit,
-            quota_exceeded,
-            epoch,
-        )
-    }
-
-    fn new_with_traffic_lease(
-        inner: S,
-        counters: Arc<SharedCounters>,
-        stats: Arc<Stats>,
-        user: String,
-        traffic_lease: Option<Arc<TrafficLease>>,
-        quota_limit: Option<u64>,
-        quota_exceeded: Arc<AtomicBool>,
-        epoch: Instant,
-    ) -> Self {
-        // Mark initial activity so the watchdog doesn't fire before data flows
-        counters.touch(Instant::now(), epoch);
-        let user_stats = stats.get_or_create_user_stats_handle(&user);
-        Self {
-            inner,
-            counters,
-            stats,
-            user,
-            user_stats,
-            traffic_lease,
-            c2s_rate_debt_bytes: 0,
-            c2s_wait: RateWaitState::default(),
-            s2c_wait: RateWaitState::default(),
-            quota_wait: RateWaitState::default(),
-            quota_limit,
-            quota_exceeded,
-            quota_bytes_since_check: 0,
-            epoch,
-        }
-    }
-
-    fn record_wait(
-        wait: &mut RateWaitState,
-        lease: Option<&Arc<TrafficLease>>,
-        direction: RateDirection,
-    ) {
-        let Some(started_at) = wait.started_at.take() else {
-            return;
-        };
-        let wait_ms = started_at.elapsed().as_millis().min(u128::from(u64::MAX)) as u64;
-        if let Some(lease) = lease {
-            lease.observe_wait_ms(direction, wait.blocked_user, wait.blocked_cidr, wait_ms);
-        }
-        wait.blocked_user = false;
-        wait.blocked_cidr = false;
-    }
-
-    fn arm_wait(wait: &mut RateWaitState, blocked_user: bool, blocked_cidr: bool) {
-        if wait.sleep.is_none() {
-            wait.sleep = Some(Box::pin(tokio::time::sleep(next_refill_delay())));
-            wait.started_at = Some(Instant::now());
-        }
-        wait.blocked_user |= blocked_user;
-        wait.blocked_cidr |= blocked_cidr;
-    }
-
-    fn poll_wait(
-        wait: &mut RateWaitState,
-        cx: &mut Context<'_>,
-        lease: Option<&Arc<TrafficLease>>,
-        direction: RateDirection,
-    ) -> Poll<()> {
-        let Some(sleep) = wait.sleep.as_mut() else {
-            return Poll::Ready(());
-        };
-        if sleep.as_mut().poll(cx).is_pending() {
-            return Poll::Pending;
-        }
-        wait.sleep = None;
-        Self::record_wait(wait, lease, direction);
-        Poll::Ready(())
-    }
-
-    fn settle_c2s_rate_debt(&mut self, cx: &mut Context<'_>) -> Poll<()> {
-        let Some(lease) = self.traffic_lease.as_ref() else {
-            self.c2s_rate_debt_bytes = 0;
-            return Poll::Ready(());
-        };
-
-        while self.c2s_rate_debt_bytes > 0 {
-            let consume = lease.try_consume(RateDirection::Up, self.c2s_rate_debt_bytes);
-            if consume.granted > 0 {
-                self.c2s_rate_debt_bytes = self.c2s_rate_debt_bytes.saturating_sub(consume.granted);
-                continue;
-            }
-            Self::arm_wait(
-                &mut self.c2s_wait,
-                consume.blocked_user,
-                consume.blocked_cidr,
-            );
-            if Self::poll_wait(&mut self.c2s_wait, cx, Some(lease), RateDirection::Up).is_pending()
-            {
-                return Poll::Pending;
-            }
-        }
-
-        if Self::poll_wait(&mut self.c2s_wait, cx, Some(lease), RateDirection::Up).is_pending() {
-            return Poll::Pending;
-        }
-
-        Poll::Ready(())
-    }
-
-    fn arm_quota_wait(&mut self, cx: &mut Context<'_>) -> Poll<()> {
-        Self::arm_wait(&mut self.quota_wait, false, false);
-        Self::poll_wait(&mut self.quota_wait, cx, None, RateDirection::Up)
-    }
-}
-
-#[derive(Debug)]
-struct QuotaIoSentinel;
-
-impl std::fmt::Display for QuotaIoSentinel {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        f.write_str("user data quota exceeded")
-    }
-}
-
-impl std::error::Error for QuotaIoSentinel {}
-
-fn quota_io_error() -> io::Error {
-    io::Error::new(io::ErrorKind::PermissionDenied, QuotaIoSentinel)
-}
-
-fn is_quota_io_error(err: &io::Error) -> bool {
-    err.kind() == io::ErrorKind::PermissionDenied
-        && err
-            .get_ref()
-            .and_then(|source| source.downcast_ref::<QuotaIoSentinel>())
-            .is_some()
-}
-
-const QUOTA_NEAR_LIMIT_BYTES: u64 = 64 * 1024;
-const QUOTA_LARGE_CHARGE_BYTES: u64 = 16 * 1024;
-const QUOTA_ADAPTIVE_INTERVAL_MIN_BYTES: u64 = 4 * 1024;
-const QUOTA_ADAPTIVE_INTERVAL_MAX_BYTES: u64 = 64 * 1024;
-const QUOTA_RESERVE_SPIN_RETRIES: usize = 64;
-const QUOTA_RESERVE_MAX_ROUNDS: usize = 8;
-
-#[inline]
-fn quota_adaptive_interval_bytes(remaining_before: u64) -> u64 {
-    remaining_before.saturating_div(2).clamp(
-        QUOTA_ADAPTIVE_INTERVAL_MIN_BYTES,
-        QUOTA_ADAPTIVE_INTERVAL_MAX_BYTES,
-    )
-}
-
-#[inline]
-fn should_immediate_quota_check(remaining_before: u64, charge_bytes: u64) -> bool {
-    remaining_before <= QUOTA_NEAR_LIMIT_BYTES || charge_bytes >= QUOTA_LARGE_CHARGE_BYTES
-}
-
-fn refund_reserved_quota_bytes(user_stats: &UserStats, reserved_bytes: u64) {
-    if reserved_bytes == 0 {
-        return;
-    }
-    let mut current = user_stats.quota_used.load(Ordering::Relaxed);
-    loop {
-        let next = current.saturating_sub(reserved_bytes);
-        match user_stats.quota_used.compare_exchange_weak(
-            current,
-            next,
-            Ordering::Relaxed,
-            Ordering::Relaxed,
-        ) {
-            Ok(_) => return,
-            Err(observed) => current = observed,
-        }
-    }
-}
-
-impl<S: AsyncRead + Unpin> AsyncRead for StatsIo<S> {
-    fn poll_read(
-        self: Pin<&mut Self>,
-        cx: &mut Context<'_>,
-        buf: &mut ReadBuf<'_>,
-    ) -> Poll<io::Result<()>> {
-        let this = self.get_mut();
-        if this.quota_exceeded.load(Ordering::Acquire) {
-            return Poll::Ready(Err(quota_io_error()));
-        }
-        if this.settle_c2s_rate_debt(cx).is_pending() {
-            return Poll::Pending;
-        }
-        if buf.remaining() == 0 {
-            return Pin::new(&mut this.inner).poll_read(cx, buf);
-        }
-
-        let mut remaining_before = None;
-        let mut reserved_read_bytes = 0u64;
-        let mut read_limit = buf.remaining();
-        if let Some(limit) = this.quota_limit {
-            let used_before = this.user_stats.quota_used();
-            let remaining = limit.saturating_sub(used_before);
-            if remaining == 0 {
-                this.quota_exceeded.store(true, Ordering::Release);
-                return Poll::Ready(Err(quota_io_error()));
-            }
-            remaining_before = Some(remaining);
-            read_limit = read_limit.min(remaining as usize);
-            if read_limit == 0 {
-                this.quota_exceeded.store(true, Ordering::Release);
-                return Poll::Ready(Err(quota_io_error()));
-            }
-
-            let desired = read_limit as u64;
-            let mut reserve_rounds = 0usize;
-            while reserved_read_bytes == 0 {
-                for _ in 0..QUOTA_RESERVE_SPIN_RETRIES {
-                    match this.user_stats.quota_try_reserve(desired, limit) {
-                        Ok(_) => {
-                            reserved_read_bytes = desired;
-                            break;
-                        }
-                        Err(crate::stats::QuotaReserveError::LimitExceeded) => {
-                            this.quota_exceeded.store(true, Ordering::Release);
-                            return Poll::Ready(Err(quota_io_error()));
-                        }
-                        Err(crate::stats::QuotaReserveError::Contended) => {
-                            this.stats.increment_quota_contention_total();
-                        }
-                    }
-                }
-
-                if reserved_read_bytes == 0 {
-                    reserve_rounds = reserve_rounds.saturating_add(1);
-                    if reserve_rounds >= QUOTA_RESERVE_MAX_ROUNDS {
-                        this.stats.increment_quota_contention_timeout_total();
-                        if this.arm_quota_wait(cx).is_pending() {
-                            return Poll::Pending;
-                        }
-                        reserve_rounds = 0;
-                    }
-                }
-            }
-        }
-
-        let limited_read = read_limit < buf.remaining();
-        let read_result = if limited_read {
-            let mut limited_buf = ReadBuf::new(buf.initialize_unfilled_to(read_limit));
-            match Pin::new(&mut this.inner).poll_read(cx, &mut limited_buf) {
-                Poll::Ready(Ok(())) => {
-                    let n = limited_buf.filled().len();
-                    buf.advance(n);
-                    Poll::Ready(Ok(n))
-                }
-                Poll::Ready(Err(err)) => Poll::Ready(Err(err)),
-                Poll::Pending => Poll::Pending,
-            }
-        } else {
-            let before = buf.filled().len();
-            match Pin::new(&mut this.inner).poll_read(cx, buf) {
-                Poll::Ready(Ok(())) => {
-                    let n = buf.filled().len() - before;
-                    Poll::Ready(Ok(n))
-                }
-                Poll::Ready(Err(err)) => Poll::Ready(Err(err)),
-                Poll::Pending => Poll::Pending,
-            }
-        };
-
-        match read_result {
-            Poll::Ready(Ok(n)) => {
-                if reserved_read_bytes > n as u64 {
-                    let refund_bytes = reserved_read_bytes - n as u64;
-                    refund_reserved_quota_bytes(this.user_stats.as_ref(), refund_bytes);
-                    this.stats.add_quota_refund_bytes_total(refund_bytes);
-                }
-                if n > 0 {
-                    let n_to_charge = n as u64;
-
-                    if let Some(remaining) = remaining_before {
-                        if should_immediate_quota_check(remaining, n_to_charge) {
-                            this.quota_bytes_since_check = 0;
-                        } else {
-                            this.quota_bytes_since_check =
-                                this.quota_bytes_since_check.saturating_add(n_to_charge);
-                            let interval = quota_adaptive_interval_bytes(remaining);
-                            if this.quota_bytes_since_check >= interval {
-                                this.quota_bytes_since_check = 0;
-                            }
-                        }
-                    }
-                    if let Some(limit) = this.quota_limit
-                        && this.user_stats.quota_used() >= limit
-                    {
-                        this.quota_exceeded.store(true, Ordering::Release);
-                    }
-
-                    // C→S: client sent data
-                    this.counters
-                        .c2s_bytes
-                        .fetch_add(n_to_charge, Ordering::Relaxed);
-                    this.counters.c2s_ops.fetch_add(1, Ordering::Relaxed);
-                    this.counters.touch(Instant::now(), this.epoch);
-
-                    this.stats
-                        .add_user_octets_from_handle(this.user_stats.as_ref(), n_to_charge);
-                    this.stats
-                        .increment_user_msgs_from_handle(this.user_stats.as_ref());
-                    if this.traffic_lease.is_some() {
-                        this.c2s_rate_debt_bytes =
-                            this.c2s_rate_debt_bytes.saturating_add(n_to_charge);
-                        let _ = this.settle_c2s_rate_debt(cx);
-                    }
-
-                    trace!(user = %this.user, bytes = n, "C->S");
-                }
-                Poll::Ready(Ok(()))
-            }
-            Poll::Pending => {
-                if reserved_read_bytes > 0 {
-                    refund_reserved_quota_bytes(this.user_stats.as_ref(), reserved_read_bytes);
-                    this.stats.add_quota_refund_bytes_total(reserved_read_bytes);
-                }
-                Poll::Pending
-            }
-            Poll::Ready(Err(err)) => {
-                if reserved_read_bytes > 0 {
-                    refund_reserved_quota_bytes(this.user_stats.as_ref(), reserved_read_bytes);
-                    this.stats.add_quota_refund_bytes_total(reserved_read_bytes);
-                }
-                Poll::Ready(Err(err))
-            }
-        }
-    }
-}
-
-impl<S: AsyncWrite + Unpin> AsyncWrite for StatsIo<S> {
-    fn poll_write(
-        self: Pin<&mut Self>,
-        cx: &mut Context<'_>,
-        buf: &[u8],
-    ) -> Poll<io::Result<usize>> {
-        let this = self.get_mut();
-        if this.quota_exceeded.load(Ordering::Acquire) {
-            return Poll::Ready(Err(quota_io_error()));
-        }
-
-        let mut shaper_reserved_bytes = 0u64;
-        let mut write_buf = buf;
-        if let Some(lease) = this.traffic_lease.as_ref() {
-            if !buf.is_empty() {
-                loop {
-                    let consume = lease.try_consume(RateDirection::Down, buf.len() as u64);
-                    if consume.granted > 0 {
-                        shaper_reserved_bytes = consume.granted;
-                        if consume.granted < buf.len() as u64 {
-                            write_buf = &buf[..consume.granted as usize];
-                        }
-                        let _ = Self::poll_wait(
-                            &mut this.s2c_wait,
-                            cx,
-                            Some(lease),
-                            RateDirection::Down,
-                        );
-                        break;
-                    }
-
-                    Self::arm_wait(
-                        &mut this.s2c_wait,
-                        consume.blocked_user,
-                        consume.blocked_cidr,
-                    );
-                    if Self::poll_wait(&mut this.s2c_wait, cx, Some(lease), RateDirection::Down)
-                        .is_pending()
-                    {
-                        return Poll::Pending;
-                    }
-                }
-            } else {
-                let _ = Self::poll_wait(&mut this.s2c_wait, cx, Some(lease), RateDirection::Down);
-            }
-        }
-
-        let mut remaining_before = None;
-        let mut reserved_bytes = 0u64;
-        if let Some(limit) = this.quota_limit {
-            if !write_buf.is_empty() {
-                let mut reserve_rounds = 0usize;
-                while reserved_bytes == 0 {
-                    let used_before = this.user_stats.quota_used();
-                    let remaining = limit.saturating_sub(used_before);
-                    if remaining == 0 {
-                        if let Some(lease) = this.traffic_lease.as_ref() {
-                            lease.refund(RateDirection::Down, shaper_reserved_bytes);
-                        }
-                        this.quota_exceeded.store(true, Ordering::Release);
-                        return Poll::Ready(Err(quota_io_error()));
-                    }
-                    remaining_before = Some(remaining);
-
-                    let desired = remaining.min(write_buf.len() as u64);
-                    let mut saw_contention = false;
-                    for _ in 0..QUOTA_RESERVE_SPIN_RETRIES {
-                        match this.user_stats.quota_try_reserve(desired, limit) {
-                            Ok(_) => {
-                                reserved_bytes = desired;
-                                write_buf = &write_buf[..desired as usize];
-                                break;
-                            }
-                            Err(crate::stats::QuotaReserveError::LimitExceeded) => {
-                                break;
-                            }
-                            Err(crate::stats::QuotaReserveError::Contended) => {
-                                this.stats.increment_quota_contention_total();
-                                saw_contention = true;
-                            }
-                        }
-                    }
-
-                    if reserved_bytes == 0 {
-                        reserve_rounds = reserve_rounds.saturating_add(1);
-                        if reserve_rounds >= QUOTA_RESERVE_MAX_ROUNDS {
-                            this.stats.increment_quota_contention_timeout_total();
-                            if let Some(lease) = this.traffic_lease.as_ref() {
-                                lease.refund(RateDirection::Down, shaper_reserved_bytes);
-                            }
-                            let _ = this.arm_quota_wait(cx);
-                            return Poll::Pending;
-                        } else if saw_contention {
-                            std::hint::spin_loop();
-                        }
-                    }
-                }
-            } else {
-                let used_before = this.user_stats.quota_used();
-                let remaining = limit.saturating_sub(used_before);
-                if remaining == 0 {
-                    if let Some(lease) = this.traffic_lease.as_ref() {
-                        lease.refund(RateDirection::Down, shaper_reserved_bytes);
-                    }
-                    this.quota_exceeded.store(true, Ordering::Release);
-                    return Poll::Ready(Err(quota_io_error()));
-                }
-                remaining_before = Some(remaining);
-            }
-        }
-
-        match Pin::new(&mut this.inner).poll_write(cx, write_buf) {
-            Poll::Ready(Ok(n)) => {
-                if reserved_bytes > n as u64 {
-                    let refund_bytes = reserved_bytes - n as u64;
-                    refund_reserved_quota_bytes(this.user_stats.as_ref(), refund_bytes);
-                    this.stats.add_quota_refund_bytes_total(refund_bytes);
-                }
-                if shaper_reserved_bytes > n as u64
-                    && let Some(lease) = this.traffic_lease.as_ref()
-                {
-                    lease.refund(RateDirection::Down, shaper_reserved_bytes - n as u64);
-                }
-                if n > 0 {
-                    if let Some(lease) = this.traffic_lease.as_ref() {
-                        Self::record_wait(&mut this.s2c_wait, Some(lease), RateDirection::Down);
-                    }
-                    let n_to_charge = n as u64;
-
-                    // S→C: data written to client
-                    this.counters
-                        .s2c_bytes
-                        .fetch_add(n_to_charge, Ordering::Relaxed);
-                    this.counters.s2c_ops.fetch_add(1, Ordering::Relaxed);
-                    this.counters.touch(Instant::now(), this.epoch);
-
-                    this.stats
-                        .add_user_octets_to_handle(this.user_stats.as_ref(), n_to_charge);
-                    this.stats
-                        .increment_user_msgs_to_handle(this.user_stats.as_ref());
-
-                    if let (Some(limit), Some(remaining)) = (this.quota_limit, remaining_before) {
-                        if should_immediate_quota_check(remaining, n_to_charge) {
-                            this.quota_bytes_since_check = 0;
-                            if this.user_stats.quota_used() >= limit {
-                                this.quota_exceeded.store(true, Ordering::Release);
-                            }
-                        } else {
-                            this.quota_bytes_since_check =
-                                this.quota_bytes_since_check.saturating_add(n_to_charge);
-                            let interval = quota_adaptive_interval_bytes(remaining);
-                            if this.quota_bytes_since_check >= interval {
-                                this.quota_bytes_since_check = 0;
-                                if this.user_stats.quota_used() >= limit {
-                                    this.quota_exceeded.store(true, Ordering::Release);
-                                }
-                            }
-                        }
-                    }
-
-                    trace!(user = %this.user, bytes = n, "S->C");
-                }
-                Poll::Ready(Ok(n))
-            }
-            Poll::Ready(Err(err)) => {
-                if reserved_bytes > 0 {
-                    refund_reserved_quota_bytes(this.user_stats.as_ref(), reserved_bytes);
-                    this.stats.add_quota_refund_bytes_total(reserved_bytes);
-                }
-                if shaper_reserved_bytes > 0
-                    && let Some(lease) = this.traffic_lease.as_ref()
-                {
-                    lease.refund(RateDirection::Down, shaper_reserved_bytes);
-                }
-                Poll::Ready(Err(err))
-            }
-            Poll::Pending => {
-                if reserved_bytes > 0 {
-                    refund_reserved_quota_bytes(this.user_stats.as_ref(), reserved_bytes);
-                    this.stats.add_quota_refund_bytes_total(reserved_bytes);
-                }
-                if shaper_reserved_bytes > 0
-                    && let Some(lease) = this.traffic_lease.as_ref()
-                {
-                    lease.refund(RateDirection::Down, shaper_reserved_bytes);
-                }
-                Poll::Pending
-            }
-        }
-    }
-
-    #[inline]
-    fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
-        Pin::new(&mut self.get_mut().inner).poll_flush(cx)
-    }
-
-    #[inline]
-    fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
-        Pin::new(&mut self.get_mut().inner).poll_shutdown(cx)
-    }
-}
+mod io;

+use self::io::{CombinedStream, SharedCounters, StatsIo, is_quota_io_error};
+#[cfg(test)]
+use self::io::{quota_adaptive_interval_bytes, should_immediate_quota_check};
 // ============= Relay =============

 /// Relay data bidirectionally between client and server.
@@ -887,6 +193,84 @@ pub async fn relay_bidirectional_with_activity_timeout_and_lease<CR, CW, SR, SW>
    traffic_lease: Option<Arc<TrafficLease>>,
    activity_timeout: Duration,
 ) -> Result<()>
+where
+    CR: AsyncRead + Unpin + Send + 'static,
+    CW: AsyncWrite + Unpin + Send + 'static,
+    SR: AsyncRead + Unpin + Send + 'static,
+    SW: AsyncWrite + Unpin + Send + 'static,
+{
+    relay_bidirectional_with_activity_timeout_lease_cancel_inner(
+        client_reader,
+        client_writer,
+        server_reader,
+        server_writer,
+        c2s_buf_size,
+        s2c_buf_size,
+        user,
+        stats,
+        quota_limit,
+        _buffer_pool,
+        traffic_lease,
+        activity_timeout,
+        None,
+    )
+    .await
+}
+
+pub async fn relay_bidirectional_with_activity_timeout_lease_and_cancel<CR, CW, SR, SW>(
+    client_reader: CR,
+    client_writer: CW,
+    server_reader: SR,
+    server_writer: SW,
+    c2s_buf_size: usize,
+    s2c_buf_size: usize,
+    user: &str,
+    stats: Arc<Stats>,
+    quota_limit: Option<u64>,
+    _buffer_pool: Arc<BufferPool>,
+    traffic_lease: Option<Arc<TrafficLease>>,
+    activity_timeout: Duration,
+    session_cancel: CancellationToken,
+) -> Result<()>
+where
+    CR: AsyncRead + Unpin + Send + 'static,
+    CW: AsyncWrite + Unpin + Send + 'static,
+    SR: AsyncRead + Unpin + Send + 'static,
+    SW: AsyncWrite + Unpin + Send + 'static,
+{
+    relay_bidirectional_with_activity_timeout_lease_cancel_inner(
+        client_reader,
+        client_writer,
+        server_reader,
+        server_writer,
+        c2s_buf_size,
+        s2c_buf_size,
+        user,
+        stats,
+        quota_limit,
+        _buffer_pool,
+        traffic_lease,
+        activity_timeout,
+        Some(session_cancel),
+    )
+    .await
+}
+
+async fn relay_bidirectional_with_activity_timeout_lease_cancel_inner<CR, CW, SR, SW>(
+    client_reader: CR,
+    client_writer: CW,
+    server_reader: SR,
+    server_writer: SW,
+    c2s_buf_size: usize,
+    s2c_buf_size: usize,
+    user: &str,
+    stats: Arc<Stats>,
+    quota_limit: Option<u64>,
+    _buffer_pool: Arc<BufferPool>,
+    traffic_lease: Option<Arc<TrafficLease>>,
+    activity_timeout: Duration,
+    session_cancel: Option<CancellationToken>,
+) -> Result<()>
 where
    CR: AsyncRead + Unpin + Send + 'static,
    CW: AsyncWrite + Unpin + Send + 'static,
@@ -983,14 +367,29 @@ where
    //
    // When the watchdog fires, select! drops the copy future,
    // releasing the &mut borrows on client and server.
-    let copy_result = tokio::select! {
+    enum RelayOutcome {
+        Copy(std::io::Result<(u64, u64)>),
+        ActivityTimeout,
+        UserDisabled,
+    }
+
+    let cancel_wait = async move {
+        match session_cancel {
+            Some(token) => token.cancelled().await,
+            None => pending::<()>().await,
+        }
+    };
+    tokio::pin!(cancel_wait);
+
+    let relay_outcome = tokio::select! {
        result = copy_bidirectional_with_sizes(
            &mut client,
            &mut server,
            c2s_buf_size.max(1),
            s2c_buf_size.max(1),
-        ) => Some(result),
-        _ = watchdog => None, // Activity timeout — cancel relay
+        ) => RelayOutcome::Copy(result),
+        _ = watchdog => RelayOutcome::ActivityTimeout,
+        _ = &mut cancel_wait => RelayOutcome::UserDisabled,
    };

    // ── Clean shutdown ──────────────────────────────────────────────
@@ -1004,8 +403,8 @@ where
    let s2c_ops = counters.s2c_ops.load(Ordering::Relaxed);
    let duration = epoch.elapsed();

-    match copy_result {
-        Some(Ok((c2s, s2c))) => {
+    match relay_outcome {
+        RelayOutcome::Copy(Ok((c2s, s2c))) => {
            // Normal completion — one side closed the connection
            debug!(
                user = %user_owned,
@@ -1018,7 +417,7 @@ where
            );
            Ok(())
        }
-        Some(Err(e)) if is_quota_io_error(&e) => {
+        RelayOutcome::Copy(Err(e)) if is_quota_io_error(&e) => {
            let c2s = counters.c2s_bytes.load(Ordering::Relaxed);
            let s2c = counters.s2c_bytes.load(Ordering::Relaxed);
            warn!(
@@ -1034,7 +433,7 @@ where
                user: user_owned.clone(),
            })
        }
-        Some(Err(e)) => {
+        RelayOutcome::Copy(Err(e)) => {
            // I/O error in one of the directions
            let c2s = counters.c2s_bytes.load(Ordering::Relaxed);
            let s2c = counters.s2c_bytes.load(Ordering::Relaxed);
@@ -1050,7 +449,7 @@ where
            );
            Err(e.into())
        }
-        None => {
+        RelayOutcome::ActivityTimeout => {
            // Activity timeout (watchdog fired)
            let c2s = counters.c2s_bytes.load(Ordering::Relaxed);
            let s2c = counters.s2c_bytes.load(Ordering::Relaxed);
@@ -1065,6 +464,22 @@ where
            );
            Ok(())
        }
+        RelayOutcome::UserDisabled => {
+            let c2s = counters.c2s_bytes.load(Ordering::Relaxed);
+            let s2c = counters.s2c_bytes.load(Ordering::Relaxed);
+            debug!(
+                user = %user_owned,
+                c2s_bytes = c2s,
+                s2c_bytes = s2c,
+                c2s_msgs = c2s_ops,
+                s2c_msgs = s2c_ops,
+                duration_secs = duration.as_secs(),
+                "Relay finished (user disabled)"
+            );
+            Err(ProxyError::UserDisabled {
+                user: user_owned.clone(),
+            })
+        }
    }
 }

@@ -0,0 +1,551 @@
+use crate::proxy::traffic_limiter::{RateDirection, TrafficLease, next_refill_delay};
+use crate::stats::{Stats, UserStats};
+use std::io;
+use std::pin::Pin;
+use std::sync::Arc;
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::task::{Context, Poll};
+use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
+use tokio::time::{Instant, Sleep};
+use tracing::trace;
+
+mod combined;
+mod counters;
+mod quota;
+
+pub(super) use self::combined::CombinedStream;
+pub(super) use self::counters::SharedCounters;
+pub(super) use self::quota::is_quota_io_error;
+use self::quota::{
+    QUOTA_RESERVE_MAX_ROUNDS, QUOTA_RESERVE_SPIN_RETRIES, quota_io_error,
+    refund_reserved_quota_bytes,
+};
+pub(super) use self::quota::{quota_adaptive_interval_bytes, should_immediate_quota_check};
+
+/// Transparent I/O wrapper that tracks per-user statistics and activity.
+///
+/// Wraps the **client** side of the relay. Direction mapping:
+///
+/// | poll method  | direction | stats updated                        |
+/// |-------------|-----------|--------------------------------------|
+/// | `poll_read`  | C→S       | `octets_from`, `msgs_from`, counters |
+/// | `poll_write` | S→C       | `octets_to`, `msgs_to`, counters     |
+///
+/// Both update the shared activity timestamp for the watchdog.
+///
+/// Note on message counts: the original code counted one `read()`/`write_all()`
+/// as one "message". Here we count `poll_read`/`poll_write` completions instead.
+/// Byte counts are identical; op counts may differ slightly due to different
+/// internal buffering in `copy_bidirectional`. This is fine for monitoring.
+pub(super) struct StatsIo<S> {
+    inner: S,
+    counters: Arc<SharedCounters>,
+    stats: Arc<Stats>,
+    user: String,
+    user_stats: Arc<UserStats>,
+    traffic_lease: Option<Arc<TrafficLease>>,
+    c2s_rate_debt_bytes: u64,
+    c2s_wait: RateWaitState,
+    s2c_wait: RateWaitState,
+    quota_wait: RateWaitState,
+    quota_limit: Option<u64>,
+    quota_exceeded: Arc<AtomicBool>,
+    pub(super) quota_bytes_since_check: u64,
+    epoch: Instant,
+}
+
+#[derive(Default)]
+struct RateWaitState {
+    sleep: Option<Pin<Box<Sleep>>>,
+    started_at: Option<Instant>,
+    blocked_user: bool,
+    blocked_cidr: bool,
+}
+
+impl<S> StatsIo<S> {
+    /// Creates a StatsIo wrapper without a traffic lease for relay unit tests.
+    #[cfg(test)]
+    pub(super) fn new(
+        inner: S,
+        counters: Arc<SharedCounters>,
+        stats: Arc<Stats>,
+        user: String,
+        quota_limit: Option<u64>,
+        quota_exceeded: Arc<AtomicBool>,
+        epoch: Instant,
+    ) -> Self {
+        Self::new_with_traffic_lease(
+            inner,
+            counters,
+            stats,
+            user,
+            None,
+            quota_limit,
+            quota_exceeded,
+            epoch,
+        )
+    }
+
+    pub(super) fn new_with_traffic_lease(
+        inner: S,
+        counters: Arc<SharedCounters>,
+        stats: Arc<Stats>,
+        user: String,
+        traffic_lease: Option<Arc<TrafficLease>>,
+        quota_limit: Option<u64>,
+        quota_exceeded: Arc<AtomicBool>,
+        epoch: Instant,
+    ) -> Self {
+        // Mark initial activity so the watchdog doesn't fire before data flows
+        counters.touch(Instant::now(), epoch);
+        let user_stats = stats.get_or_create_user_stats_handle(&user);
+        Self {
+            inner,
+            counters,
+            stats,
+            user,
+            user_stats,
+            traffic_lease,
+            c2s_rate_debt_bytes: 0,
+            c2s_wait: RateWaitState::default(),
+            s2c_wait: RateWaitState::default(),
+            quota_wait: RateWaitState::default(),
+            quota_limit,
+            quota_exceeded,
+            quota_bytes_since_check: 0,
+            epoch,
+        }
+    }
+
+    fn record_wait(
+        wait: &mut RateWaitState,
+        lease: Option<&Arc<TrafficLease>>,
+        direction: RateDirection,
+    ) {
+        let Some(started_at) = wait.started_at.take() else {
+            return;
+        };
+        let wait_ms = started_at.elapsed().as_millis().min(u128::from(u64::MAX)) as u64;
+        if let Some(lease) = lease {
+            lease.observe_wait_ms(direction, wait.blocked_user, wait.blocked_cidr, wait_ms);
+        }
+        wait.blocked_user = false;
+        wait.blocked_cidr = false;
+    }
+
+    fn arm_wait(wait: &mut RateWaitState, blocked_user: bool, blocked_cidr: bool) {
+        if wait.sleep.is_none() {
+            wait.sleep = Some(Box::pin(tokio::time::sleep(next_refill_delay())));
+            wait.started_at = Some(Instant::now());
+        }
+        wait.blocked_user |= blocked_user;
+        wait.blocked_cidr |= blocked_cidr;
+    }
+
+    fn poll_wait(
+        wait: &mut RateWaitState,
+        cx: &mut Context<'_>,
+        lease: Option<&Arc<TrafficLease>>,
+        direction: RateDirection,
+    ) -> Poll<()> {
+        let Some(sleep) = wait.sleep.as_mut() else {
+            return Poll::Ready(());
+        };
+        if sleep.as_mut().poll(cx).is_pending() {
+            return Poll::Pending;
+        }
+        wait.sleep = None;
+        Self::record_wait(wait, lease, direction);
+        Poll::Ready(())
+    }
+
+    fn settle_c2s_rate_debt(&mut self, cx: &mut Context<'_>) -> Poll<()> {
+        let Some(lease) = self.traffic_lease.as_ref() else {
+            self.c2s_rate_debt_bytes = 0;
+            return Poll::Ready(());
+        };
+
+        while self.c2s_rate_debt_bytes > 0 {
+            let consume = lease.try_consume(RateDirection::Up, self.c2s_rate_debt_bytes);
+            if consume.granted > 0 {
+                self.c2s_rate_debt_bytes = self.c2s_rate_debt_bytes.saturating_sub(consume.granted);
+                continue;
+            }
+            Self::arm_wait(
+                &mut self.c2s_wait,
+                consume.blocked_user,
+                consume.blocked_cidr,
+            );
+            if Self::poll_wait(&mut self.c2s_wait, cx, Some(lease), RateDirection::Up).is_pending()
+            {
+                return Poll::Pending;
+            }
+        }
+
+        if Self::poll_wait(&mut self.c2s_wait, cx, Some(lease), RateDirection::Up).is_pending() {
+            return Poll::Pending;
+        }
+
+        Poll::Ready(())
+    }
+
+    fn arm_quota_wait(&mut self, cx: &mut Context<'_>) -> Poll<()> {
+        Self::arm_wait(&mut self.quota_wait, false, false);
+        Self::poll_wait(&mut self.quota_wait, cx, None, RateDirection::Up)
+    }
+}
+
+impl<S: AsyncRead + Unpin> AsyncRead for StatsIo<S> {
+    fn poll_read(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &mut ReadBuf<'_>,
+    ) -> Poll<io::Result<()>> {
+        let this = self.get_mut();
+        if this.quota_exceeded.load(Ordering::Acquire) {
+            return Poll::Ready(Err(quota_io_error()));
+        }
+        if this.settle_c2s_rate_debt(cx).is_pending() {
+            return Poll::Pending;
+        }
+        if buf.remaining() == 0 {
+            return Pin::new(&mut this.inner).poll_read(cx, buf);
+        }
+
+        let mut remaining_before = None;
+        let mut reserved_read_bytes = 0u64;
+        let mut read_limit = buf.remaining();
+        if let Some(limit) = this.quota_limit {
+            let used_before = this.user_stats.quota_used();
+            let remaining = limit.saturating_sub(used_before);
+            if remaining == 0 {
+                this.quota_exceeded.store(true, Ordering::Release);
+                return Poll::Ready(Err(quota_io_error()));
+            }
+            remaining_before = Some(remaining);
+            read_limit = read_limit.min(remaining as usize);
+            if read_limit == 0 {
+                this.quota_exceeded.store(true, Ordering::Release);
+                return Poll::Ready(Err(quota_io_error()));
+            }
+
+            let desired = read_limit as u64;
+            let mut reserve_rounds = 0usize;
+            while reserved_read_bytes == 0 {
+                for _ in 0..QUOTA_RESERVE_SPIN_RETRIES {
+                    match this.user_stats.quota_try_reserve(desired, limit) {
+                        Ok(_) => {
+                            reserved_read_bytes = desired;
+                            break;
+                        }
+                        Err(crate::stats::QuotaReserveError::LimitExceeded) => {
+                            this.quota_exceeded.store(true, Ordering::Release);
+                            return Poll::Ready(Err(quota_io_error()));
+                        }
+                        Err(crate::stats::QuotaReserveError::Contended) => {
+                            this.stats.increment_quota_contention_total();
+                        }
+                    }
+                }
+
+                if reserved_read_bytes == 0 {
+                    reserve_rounds = reserve_rounds.saturating_add(1);
+                    if reserve_rounds >= QUOTA_RESERVE_MAX_ROUNDS {
+                        this.stats.increment_quota_contention_timeout_total();
+                        if this.arm_quota_wait(cx).is_pending() {
+                            return Poll::Pending;
+                        }
+                        reserve_rounds = 0;
+                    }
+                }
+            }
+        }
+
+        let limited_read = read_limit < buf.remaining();
+        let read_result = if limited_read {
+            let mut limited_buf = ReadBuf::new(buf.initialize_unfilled_to(read_limit));
+            match Pin::new(&mut this.inner).poll_read(cx, &mut limited_buf) {
+                Poll::Ready(Ok(())) => {
+                    let n = limited_buf.filled().len();
+                    buf.advance(n);
+                    Poll::Ready(Ok(n))
+                }
+                Poll::Ready(Err(err)) => Poll::Ready(Err(err)),
+                Poll::Pending => Poll::Pending,
+            }
+        } else {
+            let before = buf.filled().len();
+            match Pin::new(&mut this.inner).poll_read(cx, buf) {
+                Poll::Ready(Ok(())) => {
+                    let n = buf.filled().len() - before;
+                    Poll::Ready(Ok(n))
+                }
+                Poll::Ready(Err(err)) => Poll::Ready(Err(err)),
+                Poll::Pending => Poll::Pending,
+            }
+        };
+
+        match read_result {
+            Poll::Ready(Ok(n)) => {
+                if reserved_read_bytes > n as u64 {
+                    let refund_bytes = reserved_read_bytes - n as u64;
+                    refund_reserved_quota_bytes(this.user_stats.as_ref(), refund_bytes);
+                    this.stats.add_quota_refund_bytes_total(refund_bytes);
+                }
+                if n > 0 {
+                    let n_to_charge = n as u64;
+
+                    if let Some(remaining) = remaining_before {
+                        if should_immediate_quota_check(remaining, n_to_charge) {
+                            this.quota_bytes_since_check = 0;
+                        } else {
+                            this.quota_bytes_since_check =
+                                this.quota_bytes_since_check.saturating_add(n_to_charge);
+                            let interval = quota_adaptive_interval_bytes(remaining);
+                            if this.quota_bytes_since_check >= interval {
+                                this.quota_bytes_since_check = 0;
+                            }
+                        }
+                    }
+                    if let Some(limit) = this.quota_limit
+                        && this.user_stats.quota_used() >= limit
+                    {
+                        this.quota_exceeded.store(true, Ordering::Release);
+                    }
+
+                    // C→S: client sent data
+                    this.counters
+                        .c2s_bytes
+                        .fetch_add(n_to_charge, Ordering::Relaxed);
+                    this.counters.c2s_ops.fetch_add(1, Ordering::Relaxed);
+                    this.counters.touch(Instant::now(), this.epoch);
+
+                    this.stats
+                        .add_user_traffic_from_handle(this.user_stats.as_ref(), n_to_charge);
+                    if this.traffic_lease.is_some() {
+                        this.c2s_rate_debt_bytes =
+                            this.c2s_rate_debt_bytes.saturating_add(n_to_charge);
+                        let _ = this.settle_c2s_rate_debt(cx);
+                    }
+
+                    trace!(user = %this.user, bytes = n, "C->S");
+                }
+                Poll::Ready(Ok(()))
+            }
+            Poll::Pending => {
+                if reserved_read_bytes > 0 {
+                    refund_reserved_quota_bytes(this.user_stats.as_ref(), reserved_read_bytes);
+                    this.stats.add_quota_refund_bytes_total(reserved_read_bytes);
+                }
+                Poll::Pending
+            }
+            Poll::Ready(Err(err)) => {
+                if reserved_read_bytes > 0 {
+                    refund_reserved_quota_bytes(this.user_stats.as_ref(), reserved_read_bytes);
+                    this.stats.add_quota_refund_bytes_total(reserved_read_bytes);
+                }
+                Poll::Ready(Err(err))
+            }
+        }
+    }
+}
+
+impl<S: AsyncWrite + Unpin> AsyncWrite for StatsIo<S> {
+    fn poll_write(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &[u8],
+    ) -> Poll<io::Result<usize>> {
+        let this = self.get_mut();
+        if this.quota_exceeded.load(Ordering::Acquire) {
+            return Poll::Ready(Err(quota_io_error()));
+        }
+
+        let mut shaper_reserved_bytes = 0u64;
+        let mut write_buf = buf;
+        if let Some(lease) = this.traffic_lease.as_ref() {
+            if !buf.is_empty() {
+                loop {
+                    let consume = lease.try_consume(RateDirection::Down, buf.len() as u64);
+                    if consume.granted > 0 {
+                        shaper_reserved_bytes = consume.granted;
+                        if consume.granted < buf.len() as u64 {
+                            write_buf = &buf[..consume.granted as usize];
+                        }
+                        let _ = Self::poll_wait(
+                            &mut this.s2c_wait,
+                            cx,
+                            Some(lease),
+                            RateDirection::Down,
+                        );
+                        break;
+                    }
+
+                    Self::arm_wait(
+                        &mut this.s2c_wait,
+                        consume.blocked_user,
+                        consume.blocked_cidr,
+                    );
+                    if Self::poll_wait(&mut this.s2c_wait, cx, Some(lease), RateDirection::Down)
+                        .is_pending()
+                    {
+                        return Poll::Pending;
+                    }
+                }
+            } else {
+                let _ = Self::poll_wait(&mut this.s2c_wait, cx, Some(lease), RateDirection::Down);
+            }
+        }
+
+        let mut remaining_before = None;
+        let mut reserved_bytes = 0u64;
+        if let Some(limit) = this.quota_limit {
+            if !write_buf.is_empty() {
+                let mut reserve_rounds = 0usize;
+                while reserved_bytes == 0 {
+                    let used_before = this.user_stats.quota_used();
+                    let remaining = limit.saturating_sub(used_before);
+                    if remaining == 0 {
+                        if let Some(lease) = this.traffic_lease.as_ref() {
+                            lease.refund(RateDirection::Down, shaper_reserved_bytes);
+                        }
+                        this.quota_exceeded.store(true, Ordering::Release);
+                        return Poll::Ready(Err(quota_io_error()));
+                    }
+                    remaining_before = Some(remaining);
+
+                    let desired = remaining.min(write_buf.len() as u64);
+                    let mut saw_contention = false;
+                    for _ in 0..QUOTA_RESERVE_SPIN_RETRIES {
+                        match this.user_stats.quota_try_reserve(desired, limit) {
+                            Ok(_) => {
+                                reserved_bytes = desired;
+                                write_buf = &write_buf[..desired as usize];
+                                break;
+                            }
+                            Err(crate::stats::QuotaReserveError::LimitExceeded) => {
+                                break;
+                            }
+                            Err(crate::stats::QuotaReserveError::Contended) => {
+                                this.stats.increment_quota_contention_total();
+                                saw_contention = true;
+                            }
+                        }
+                    }
+
+                    if reserved_bytes == 0 {
+                        reserve_rounds = reserve_rounds.saturating_add(1);
+                        if reserve_rounds >= QUOTA_RESERVE_MAX_ROUNDS {
+                            this.stats.increment_quota_contention_timeout_total();
+                            if let Some(lease) = this.traffic_lease.as_ref() {
+                                lease.refund(RateDirection::Down, shaper_reserved_bytes);
+                            }
+                            let _ = this.arm_quota_wait(cx);
+                            return Poll::Pending;
+                        } else if saw_contention {
+                            std::hint::spin_loop();
+                        }
+                    }
+                }
+            } else {
+                let used_before = this.user_stats.quota_used();
+                let remaining = limit.saturating_sub(used_before);
+                if remaining == 0 {
+                    if let Some(lease) = this.traffic_lease.as_ref() {
+                        lease.refund(RateDirection::Down, shaper_reserved_bytes);
+                    }
+                    this.quota_exceeded.store(true, Ordering::Release);
+                    return Poll::Ready(Err(quota_io_error()));
+                }
+                remaining_before = Some(remaining);
+            }
+        }
+
+        match Pin::new(&mut this.inner).poll_write(cx, write_buf) {
+            Poll::Ready(Ok(n)) => {
+                if reserved_bytes > n as u64 {
+                    let refund_bytes = reserved_bytes - n as u64;
+                    refund_reserved_quota_bytes(this.user_stats.as_ref(), refund_bytes);
+                    this.stats.add_quota_refund_bytes_total(refund_bytes);
+                }
+                if shaper_reserved_bytes > n as u64
+                    && let Some(lease) = this.traffic_lease.as_ref()
+                {
+                    lease.refund(RateDirection::Down, shaper_reserved_bytes - n as u64);
+                }
+                if n > 0 {
+                    if let Some(lease) = this.traffic_lease.as_ref() {
+                        Self::record_wait(&mut this.s2c_wait, Some(lease), RateDirection::Down);
+                    }
+                    let n_to_charge = n as u64;
+
+                    // S→C: data written to client
+                    this.counters
+                        .s2c_bytes
+                        .fetch_add(n_to_charge, Ordering::Relaxed);
+                    this.counters.s2c_ops.fetch_add(1, Ordering::Relaxed);
+                    this.counters.touch(Instant::now(), this.epoch);
+
+                    this.stats
+                        .add_user_traffic_to_handle(this.user_stats.as_ref(), n_to_charge);
+
+                    if let (Some(limit), Some(remaining)) = (this.quota_limit, remaining_before) {
+                        if should_immediate_quota_check(remaining, n_to_charge) {
+                            this.quota_bytes_since_check = 0;
+                            if this.user_stats.quota_used() >= limit {
+                                this.quota_exceeded.store(true, Ordering::Release);
+                            }
+                        } else {
+                            this.quota_bytes_since_check =
+                                this.quota_bytes_since_check.saturating_add(n_to_charge);
+                            let interval = quota_adaptive_interval_bytes(remaining);
+                            if this.quota_bytes_since_check >= interval {
+                                this.quota_bytes_since_check = 0;
+                                if this.user_stats.quota_used() >= limit {
+                                    this.quota_exceeded.store(true, Ordering::Release);
+                                }
+                            }
+                        }
+                    }
+
+                    trace!(user = %this.user, bytes = n, "S->C");
+                }
+                Poll::Ready(Ok(n))
+            }
+            Poll::Ready(Err(err)) => {
+                if reserved_bytes > 0 {
+                    refund_reserved_quota_bytes(this.user_stats.as_ref(), reserved_bytes);
+                    this.stats.add_quota_refund_bytes_total(reserved_bytes);
+                }
+                if shaper_reserved_bytes > 0
+                    && let Some(lease) = this.traffic_lease.as_ref()
+                {
+                    lease.refund(RateDirection::Down, shaper_reserved_bytes);
+                }
+                Poll::Ready(Err(err))
+            }
+            Poll::Pending => {
+                if reserved_bytes > 0 {
+                    refund_reserved_quota_bytes(this.user_stats.as_ref(), reserved_bytes);
+                    this.stats.add_quota_refund_bytes_total(reserved_bytes);
+                }
+                if shaper_reserved_bytes > 0
+                    && let Some(lease) = this.traffic_lease.as_ref()
+                {
+                    lease.refund(RateDirection::Down, shaper_reserved_bytes);
+                }
+                Poll::Pending
+            }
+        }
+    }
+
+    #[inline]
+    fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
+        Pin::new(&mut self.get_mut().inner).poll_flush(cx)
+    }
+
+    #[inline]
+    fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
+        Pin::new(&mut self.get_mut().inner).poll_shutdown(cx)
+    }
+}
@@ -0,0 +1,61 @@
+use std::io;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
+
+// ============= CombinedStream =============
+
+/// Combines separate read and write halves into a single bidirectional stream.
+///
+/// `copy_bidirectional` requires `AsyncRead + AsyncWrite` on each side,
+/// but the handshake layer produces split reader/writer pairs
+/// (e.g. `CryptoReader<FakeTlsReader<OwnedReadHalf>>` + `CryptoWriter<...>`).
+///
+/// This wrapper reunifies them with zero overhead — each trait method
+/// delegates directly to the corresponding half. No buffering, no copies.
+///
+/// Safety: `poll_read` only touches `reader`, `poll_write` only touches `writer`,
+/// so there's no aliasing even though both are called on the same `&mut self`.
+pub(in crate::proxy::relay) struct CombinedStream<R, W> {
+    reader: R,
+    writer: W,
+}
+
+impl<R, W> CombinedStream<R, W> {
+    pub(in crate::proxy::relay) fn new(reader: R, writer: W) -> Self {
+        Self { reader, writer }
+    }
+}
+
+impl<R: AsyncRead + Unpin, W: Unpin> AsyncRead for CombinedStream<R, W> {
+    #[inline]
+    fn poll_read(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &mut ReadBuf<'_>,
+    ) -> Poll<io::Result<()>> {
+        Pin::new(&mut self.get_mut().reader).poll_read(cx, buf)
+    }
+}
+
+impl<R: Unpin, W: AsyncWrite + Unpin> AsyncWrite for CombinedStream<R, W> {
+    #[inline]
+    fn poll_write(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &[u8],
+    ) -> Poll<io::Result<usize>> {
+        Pin::new(&mut self.get_mut().writer).poll_write(cx, buf)
+    }
+
+    #[inline]
+    fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
+        Pin::new(&mut self.get_mut().writer).poll_flush(cx)
+    }
+
+    #[inline]
+    fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
+        Pin::new(&mut self.get_mut().writer).poll_shutdown(cx)
+    }
+}
@@ -0,0 +1,51 @@
+use std::sync::atomic::{AtomicU64, Ordering};
+use std::time::Duration;
+
+use tokio::time::Instant;
+
+// ============= SharedCounters =============
+
+/// Atomic counters shared between the relay (via StatsIo) and the watchdog task.
+///
+/// Using `Relaxed` ordering is sufficient because:
+/// - Counters are monotonically increasing (no ABA problem)
+/// - Slight staleness in watchdog reads is harmless (±10s check interval anyway)
+/// - No ordering dependencies between different counters
+pub(in crate::proxy::relay) struct SharedCounters {
+    /// Bytes read from client (C→S direction)
+    pub(in crate::proxy::relay) c2s_bytes: AtomicU64,
+    /// Bytes written to client (S→C direction)
+    pub(in crate::proxy::relay) s2c_bytes: AtomicU64,
+    /// Number of poll_read completions (≈ C→S chunks)
+    pub(in crate::proxy::relay) c2s_ops: AtomicU64,
+    /// Number of poll_write completions (≈ S→C chunks)
+    pub(in crate::proxy::relay) s2c_ops: AtomicU64,
+    /// Milliseconds since relay epoch of last I/O activity
+    last_activity_ms: AtomicU64,
+}
+
+impl SharedCounters {
+    pub(in crate::proxy::relay) fn new() -> Self {
+        Self {
+            c2s_bytes: AtomicU64::new(0),
+            s2c_bytes: AtomicU64::new(0),
+            c2s_ops: AtomicU64::new(0),
+            s2c_ops: AtomicU64::new(0),
+            last_activity_ms: AtomicU64::new(0),
+        }
+    }
+
+    /// Record activity at this instant.
+    #[inline]
+    pub(in crate::proxy::relay) fn touch(&self, now: Instant, epoch: Instant) {
+        let ms = now.duration_since(epoch).as_millis() as u64;
+        self.last_activity_ms.store(ms, Ordering::Relaxed);
+    }
+
+    /// How long since last recorded activity.
+    pub(in crate::proxy::relay) fn idle_duration(&self, now: Instant, epoch: Instant) -> Duration {
+        let last_ms = self.last_activity_ms.load(Ordering::Relaxed);
+        let now_ms = now.duration_since(epoch).as_millis() as u64;
+        Duration::from_millis(now_ms.saturating_sub(last_ms))
+    }
+}
@@ -0,0 +1,68 @@
+use crate::stats::UserStats;
+use std::io;
+use std::sync::atomic::Ordering;
+
+#[derive(Debug)]
+struct QuotaIoSentinel;
+
+impl std::fmt::Display for QuotaIoSentinel {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str("user data quota exceeded")
+    }
+}
+
+impl std::error::Error for QuotaIoSentinel {}
+
+pub(super) fn quota_io_error() -> io::Error {
+    io::Error::new(io::ErrorKind::PermissionDenied, QuotaIoSentinel)
+}
+
+pub(in crate::proxy::relay) fn is_quota_io_error(err: &io::Error) -> bool {
+    err.kind() == io::ErrorKind::PermissionDenied
+        && err
+            .get_ref()
+            .and_then(|source| source.downcast_ref::<QuotaIoSentinel>())
+            .is_some()
+}
+
+const QUOTA_NEAR_LIMIT_BYTES: u64 = 64 * 1024;
+const QUOTA_LARGE_CHARGE_BYTES: u64 = 16 * 1024;
+const QUOTA_ADAPTIVE_INTERVAL_MIN_BYTES: u64 = 4 * 1024;
+const QUOTA_ADAPTIVE_INTERVAL_MAX_BYTES: u64 = 64 * 1024;
+pub(super) const QUOTA_RESERVE_SPIN_RETRIES: usize = 64;
+pub(super) const QUOTA_RESERVE_MAX_ROUNDS: usize = 8;
+
+#[inline]
+pub(in crate::proxy::relay) fn quota_adaptive_interval_bytes(remaining_before: u64) -> u64 {
+    remaining_before.saturating_div(2).clamp(
+        QUOTA_ADAPTIVE_INTERVAL_MIN_BYTES,
+        QUOTA_ADAPTIVE_INTERVAL_MAX_BYTES,
+    )
+}
+
+#[inline]
+pub(in crate::proxy::relay) fn should_immediate_quota_check(
+    remaining_before: u64,
+    charge_bytes: u64,
+) -> bool {
+    remaining_before <= QUOTA_NEAR_LIMIT_BYTES || charge_bytes >= QUOTA_LARGE_CHARGE_BYTES
+}
+
+pub(super) fn refund_reserved_quota_bytes(user_stats: &UserStats, reserved_bytes: u64) {
+    if reserved_bytes == 0 {
+        return;
+    }
+    let mut current = user_stats.quota_used.load(Ordering::Relaxed);
+    loop {
+        let next = current.saturating_sub(reserved_bytes);
+        match user_stats.quota_used.compare_exchange_weak(
+            current,
+            next,
+            Ordering::Relaxed,
+            Ordering::Relaxed,
+        ) {
+            Ok(_) => return,
+            Err(observed) => current = observed,
+        }
+    }
+}
@@ -1,5 +1,5 @@
-use std::collections::HashSet;
 use std::collections::hash_map::RandomState;
+use std::collections::{HashMap, HashSet};
 use std::net::{IpAddr, SocketAddr};
 use std::sync::atomic::{AtomicBool, AtomicU32, AtomicU64, Ordering};
 use std::sync::{Arc, Mutex};
@@ -7,6 +7,7 @@ use std::time::Instant;

 use dashmap::DashMap;
 use tokio::sync::mpsc;
+use tokio_util::sync::CancellationToken;

 use crate::proxy::handshake::{AuthProbeSaturationState, AuthProbeState};
 use crate::proxy::middle_relay::{DesyncDedupRotationState, RelayIdleCandidateRegistry};
@@ -59,7 +60,7 @@ pub(crate) struct MiddleRelaySharedState {
    pub(crate) desync_hasher: RandomState,
    pub(crate) desync_full_cache_last_emit_at: Mutex<Option<Instant>>,
    pub(crate) desync_dedup_rotation_state: Mutex<DesyncDedupRotationState>,
-    pub(crate) relay_idle_registry: Mutex<RelayIdleCandidateRegistry>,
+    pub(crate) relay_idle_registry: RelayIdleCandidateRegistry,
    pub(crate) relay_idle_mark_seq: AtomicU64,
 }

@@ -67,10 +68,35 @@ pub(crate) struct ProxySharedState {
    pub(crate) handshake: HandshakeSharedState,
    pub(crate) middle_relay: MiddleRelaySharedState,
    pub(crate) traffic_limiter: Arc<TrafficLimiter>,
+    disabled_users: DashMap<String, ()>,
+    active_user_sessions: DashMap<(String, u64), CancellationToken>,
    pub(crate) conntrack_pressure_active: AtomicBool,
    pub(crate) conntrack_close_tx: Mutex<Option<mpsc::Sender<ConntrackCloseEvent>>>,
 }

+#[must_use = "registered user sessions must be kept alive until relay completion"]
+pub(crate) struct UserSessionRegistration {
+    token: CancellationToken,
+    _guard: UserSessionGuard,
+}
+
+impl UserSessionRegistration {
+    pub(crate) fn token(&self) -> CancellationToken {
+        self.token.clone()
+    }
+}
+
+struct UserSessionGuard {
+    shared: Arc<ProxySharedState>,
+    key: (String, u64),
+}
+
+impl Drop for UserSessionGuard {
+    fn drop(&mut self) {
+        self.shared.active_user_sessions.remove(&self.key);
+    }
+}
+
 impl ProxySharedState {
    pub(crate) fn new() -> Arc<Self> {
        Arc::new(Self {
@@ -97,15 +123,86 @@ impl ProxySharedState {
                desync_hasher: RandomState::new(),
                desync_full_cache_last_emit_at: Mutex::new(None),
                desync_dedup_rotation_state: Mutex::new(DesyncDedupRotationState::default()),
-                relay_idle_registry: Mutex::new(RelayIdleCandidateRegistry::default()),
+                relay_idle_registry: RelayIdleCandidateRegistry::default(),
                relay_idle_mark_seq: AtomicU64::new(0),
            },
            traffic_limiter: TrafficLimiter::new(),
+            disabled_users: DashMap::new(),
+            active_user_sessions: DashMap::new(),
            conntrack_pressure_active: AtomicBool::new(false),
            conntrack_close_tx: Mutex::new(None),
        })
    }

+    pub(crate) fn is_user_enabled(&self, user: &str) -> bool {
+        !self.disabled_users.contains_key(user)
+    }
+
+    pub(crate) fn set_user_enabled(&self, user: &str, enabled: bool) -> bool {
+        if enabled {
+            self.disabled_users.remove(user);
+            false
+        } else {
+            self.disabled_users.insert(user.to_string(), ()).is_none()
+        }
+    }
+
+    pub(crate) fn apply_user_enabled_config(
+        &self,
+        user_enabled: &HashMap<String, bool>,
+    ) -> Vec<String> {
+        let desired_disabled = user_enabled
+            .iter()
+            .filter_map(|(user, enabled)| (!*enabled).then_some(user.clone()))
+            .collect::<HashSet<_>>();
+        let current_disabled = self
+            .disabled_users
+            .iter()
+            .map(|entry| entry.key().clone())
+            .collect::<HashSet<_>>();
+
+        for user in current_disabled.difference(&desired_disabled) {
+            self.disabled_users.remove(user);
+        }
+        let newly_disabled = desired_disabled
+            .difference(&current_disabled)
+            .cloned()
+            .collect::<Vec<_>>();
+        for user in desired_disabled {
+            self.disabled_users.insert(user, ());
+        }
+        newly_disabled
+    }
+
+    pub(crate) fn register_user_session(
+        self: &Arc<Self>,
+        user: &str,
+        session_id: u64,
+    ) -> UserSessionRegistration {
+        let token = CancellationToken::new();
+        let key = (user.to_string(), session_id);
+        self.active_user_sessions.insert(key.clone(), token.clone());
+        UserSessionRegistration {
+            token,
+            _guard: UserSessionGuard {
+                shared: Arc::clone(self),
+                key,
+            },
+        }
+    }
+
+    pub(crate) fn cancel_user_sessions(&self, user: &str) -> usize {
+        let tokens = self
+            .active_user_sessions
+            .iter()
+            .filter_map(|entry| (entry.key().0 == user).then(|| entry.value().clone()))
+            .collect::<Vec<_>>();
+        for token in &tokens {
+            token.cancel();
+        }
+        tokens.len()
+    }
+
    pub(crate) fn set_conntrack_close_sender(&self, tx: mpsc::Sender<ConntrackCloseEvent>) {
        match self.conntrack_close_tx.lock() {
            Ok(mut guard) => {
@@ -166,3 +263,48 @@ impl ProxySharedState {
        self.conntrack_pressure_active.load(Ordering::Relaxed)
    }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn user_enabled_config_sync_tracks_disabled_overrides() {
+        let shared = ProxySharedState::new();
+        assert!(shared.is_user_enabled("alice"));
+
+        let mut user_enabled = HashMap::new();
+        user_enabled.insert("alice".to_string(), false);
+        user_enabled.insert("bob".to_string(), true);
+
+        let mut newly_disabled = shared.apply_user_enabled_config(&user_enabled);
+        newly_disabled.sort();
+        assert_eq!(newly_disabled, vec!["alice".to_string()]);
+        assert!(!shared.is_user_enabled("alice"));
+        assert!(shared.is_user_enabled("bob"));
+
+        assert!(shared.apply_user_enabled_config(&user_enabled).is_empty());
+
+        user_enabled.clear();
+        assert!(shared.apply_user_enabled_config(&user_enabled).is_empty());
+        assert!(shared.is_user_enabled("alice"));
+    }
+
+    #[test]
+    fn cancel_user_sessions_cancels_only_registered_matching_user() {
+        let shared = ProxySharedState::new();
+        let alice_1 = shared.register_user_session("alice", 1);
+        let alice_2 = shared.register_user_session("alice", 2);
+        let bob = shared.register_user_session("bob", 1);
+        let alice_1_token = alice_1.token();
+        let alice_2_token = alice_2.token();
+        let bob_token = bob.token();
+
+        drop(alice_1);
+
+        assert_eq!(shared.cancel_user_sessions("alice"), 1);
+        assert!(!alice_1_token.is_cancelled());
+        assert!(alice_2_token.is_cancelled());
+        assert!(!bob_token.is_cancelled());
+    }
+}
@@ -39,6 +39,7 @@ fn new_upstream_manager(stats: Arc<Stats>) -> Arc<UpstreamManager> {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -35,6 +35,7 @@ fn build_harness(config: ProxyConfig) -> PipelineHarness {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -19,6 +19,7 @@ fn new_upstream_manager(stats: Arc<Stats>) -> Arc<UpstreamManager> {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -19,6 +19,7 @@ fn new_upstream_manager(stats: Arc<Stats>) -> Arc<UpstreamManager> {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -33,6 +33,7 @@ fn new_upstream_manager(stats: Arc<Stats>) -> Arc<UpstreamManager> {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -19,6 +19,7 @@ fn new_upstream_manager(stats: Arc<Stats>) -> Arc<UpstreamManager> {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -19,6 +19,7 @@ fn new_upstream_manager(stats: Arc<Stats>) -> Arc<UpstreamManager> {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -46,6 +46,7 @@ fn build_harness(secret_hex: &str, mask_port: u16) -> PipelineHarness {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -24,6 +24,7 @@ fn make_test_upstream_manager(stats: Arc<Stats>) -> Arc<UpstreamManager> {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -47,6 +47,7 @@ fn build_harness(secret_hex: &str, mask_port: u16) -> RedTeamHarness {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -240,6 +241,7 @@ async fn redteam_03_masking_duration_must_be_less_than_1ms_when_backend_down() {
                selected_scope: String::new(),
                ipv4: None,
                ipv6: None,
+                prefer: None,
            }],
            1,
            1,
@@ -484,6 +486,7 @@ async fn measure_invalid_probe_duration_ms(delay_ms: u64, tls_len: u16, body_sen
                selected_scope: String::new(),
                ipv4: None,
                ipv6: None,
+                prefer: None,
            }],
            1,
            1,
@@ -561,6 +564,7 @@ async fn capture_forwarded_probe_len(tls_len: u16, body_sent: usize) -> usize {
                selected_scope: String::new(),
                ipv4: None,
                ipv6: None,
+                prefer: None,
            }],
            1,
            1,
@@ -21,6 +21,7 @@ fn new_upstream_manager(stats: Arc<Stats>) -> Arc<UpstreamManager> {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -19,6 +19,7 @@ fn new_upstream_manager(stats: Arc<Stats>) -> Arc<UpstreamManager> {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -19,6 +19,7 @@ fn new_upstream_manager(stats: Arc<Stats>) -> Arc<UpstreamManager> {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -19,6 +19,7 @@ fn new_upstream_manager(stats: Arc<Stats>) -> Arc<UpstreamManager> {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -19,6 +19,7 @@ fn new_upstream_manager(stats: Arc<Stats>) -> Arc<UpstreamManager> {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -33,6 +33,7 @@ fn new_upstream_manager(stats: Arc<Stats>) -> Arc<UpstreamManager> {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -341,6 +341,7 @@ async fn relay_task_abort_releases_user_gate_and_ip_reservation() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -459,6 +460,7 @@ async fn relay_cutover_releases_user_gate_and_ip_reservation() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -586,6 +588,7 @@ async fn integration_route_cutover_and_quota_overlap_fails_closed_and_releases_s
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -759,6 +762,7 @@ async fn proxy_protocol_header_is_rejected_when_trust_list_is_empty() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -839,6 +843,7 @@ async fn proxy_protocol_header_from_untrusted_peer_range_is_rejected_under_load(
                selected_scope: String::new(),
                ipv4: None,
                ipv6: None,
+                prefer: None,
            }],
            1,
            1,
@@ -1032,6 +1037,7 @@ async fn short_tls_probe_is_masked_through_client_pipeline() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -1123,6 +1129,7 @@ async fn tls12_record_probe_is_masked_through_client_pipeline() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -1212,6 +1219,7 @@ async fn handle_client_stream_increments_connects_all_exactly_once() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -1308,6 +1316,7 @@ async fn running_client_handler_increments_connects_all_exactly_once() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -1401,6 +1410,7 @@ async fn idle_pooled_connection_closes_cleanly_in_generic_stream_path() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -1475,6 +1485,7 @@ async fn idle_pooled_connection_closes_cleanly_in_client_handler_path() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -1564,6 +1575,7 @@ async fn partial_tls_header_stall_triggers_handshake_timeout() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -1892,6 +1904,7 @@ async fn valid_tls_path_does_not_fall_back_to_mask_backend() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -2004,6 +2017,7 @@ async fn valid_tls_with_invalid_mtproto_falls_back_to_mask_backend() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -2114,6 +2128,7 @@ async fn client_handler_tls_bad_mtproto_is_forwarded_to_mask_backend() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -2239,6 +2254,7 @@ async fn alpn_mismatch_tls_probe_is_masked_through_client_pipeline() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -2335,6 +2351,7 @@ async fn invalid_hmac_tls_probe_is_masked_through_client_pipeline() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -2437,6 +2454,7 @@ async fn burst_invalid_tls_probes_are_masked_verbatim() {
                selected_scope: String::new(),
                ipv4: None,
                ipv6: None,
+                prefer: None,
            }],
            1,
            1,
@@ -3395,6 +3413,7 @@ async fn relay_connect_error_releases_user_and_ip_before_return() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -3963,6 +3982,7 @@ async fn untrusted_proxy_header_source_is_rejected() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -4036,6 +4056,7 @@ async fn empty_proxy_trusted_cidrs_rejects_proxy_header_by_default() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -4136,6 +4157,7 @@ async fn oversized_tls_record_is_masked_in_generic_stream_pipeline() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -4242,6 +4264,7 @@ async fn oversized_tls_record_is_masked_in_client_handler_pipeline() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -4362,6 +4385,7 @@ async fn tls_record_len_min_minus_1_is_rejected_in_generic_stream_pipeline() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -4468,6 +4492,7 @@ async fn tls_record_len_min_minus_1_is_rejected_in_client_handler_pipeline() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -4577,6 +4602,7 @@ async fn tls_record_len_16384_is_accepted_in_generic_stream_pipeline() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -4681,6 +4707,7 @@ async fn tls_record_len_16384_is_accepted_in_client_handler_pipeline() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -32,6 +32,7 @@ fn make_test_upstream_manager(stats: Arc<Stats>) -> Arc<UpstreamManager> {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -74,12 +75,17 @@ async fn run_generic_once(class: ProbeClass) -> u128 {
    let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
    let backend_addr = listener.local_addr().unwrap();
    let backend_reply = REPLY_404.to_vec();
+    let probe = match class {
+        ProbeClass::MalformedTlsTruncation => malformed_tls_probe(),
+        ProbeClass::PlainWebBaseline => plain_web_probe(),
+    };

    let accept_task = tokio::spawn({
        let backend_reply = backend_reply.clone();
+        let expected_probe_len = probe.len();
        async move {
            let (mut stream, _) = listener.accept().await.unwrap();
-            let mut buf = [0u8; 5];
+            let mut buf = vec![0u8; expected_probe_len];
            stream.read_exact(&mut buf).await.unwrap();
            stream.write_all(&backend_reply).await.unwrap();
        }
@@ -93,6 +99,7 @@ async fn run_generic_once(class: ProbeClass) -> u128 {
    cfg.censorship.mask_host = Some("127.0.0.1".to_string());
    cfg.censorship.mask_port = backend_addr.port();
    cfg.censorship.mask_proxy_protocol = 0;
+    cfg.censorship.mask_shape_hardening = false;

    if matches!(class, ProbeClass::PlainWebBaseline) {
        cfg.general.modes.classic = false;
@@ -129,11 +136,6 @@ async fn run_generic_once(class: ProbeClass) -> u128 {
        false,
    ));

-    let probe = match class {
-        ProbeClass::MalformedTlsTruncation => malformed_tls_probe(),
-        ProbeClass::PlainWebBaseline => plain_web_probe(),
-    };
-
    let started = Instant::now();
    client_side.write_all(&probe).await.unwrap();
    client_side.shutdown().await.unwrap();
@@ -169,11 +171,16 @@ async fn run_client_handler_once(class: ProbeClass) -> u128 {
    let front_addr = front_listener.local_addr().unwrap();

    let backend_reply = REPLY_404.to_vec();
+    let probe = match class {
+        ProbeClass::MalformedTlsTruncation => malformed_tls_probe(),
+        ProbeClass::PlainWebBaseline => plain_web_probe(),
+    };
    let mask_accept_task = tokio::spawn({
        let backend_reply = backend_reply.clone();
+        let expected_probe_len = probe.len();
        async move {
            let (mut stream, _) = mask_listener.accept().await.unwrap();
-            let mut buf = [0u8; 5];
+            let mut buf = vec![0u8; expected_probe_len];
            stream.read_exact(&mut buf).await.unwrap();
            stream.write_all(&backend_reply).await.unwrap();
        }
@@ -187,6 +194,7 @@ async fn run_client_handler_once(class: ProbeClass) -> u128 {
    cfg.censorship.mask_host = Some("127.0.0.1".to_string());
    cfg.censorship.mask_port = backend_addr.port();
    cfg.censorship.mask_proxy_protocol = 0;
+    cfg.censorship.mask_shape_hardening = false;

    if matches!(class, ProbeClass::PlainWebBaseline) {
        cfg.general.modes.classic = false;
@@ -239,11 +247,6 @@ async fn run_client_handler_once(class: ProbeClass) -> u128 {
        })
    };

-    let probe = match class {
-        ProbeClass::MalformedTlsTruncation => malformed_tls_probe(),
-        ProbeClass::PlainWebBaseline => plain_web_probe(),
-    };
-
    let mut client = TcpStream::connect(front_addr).await.unwrap();
    let started = Instant::now();
    client.write_all(&probe).await.unwrap();
@@ -34,6 +34,7 @@ fn make_test_upstream_manager(stats: Arc<Stats>) -> Arc<UpstreamManager> {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -35,6 +35,7 @@ fn make_test_upstream_manager(stats: Arc<Stats>) -> Arc<UpstreamManager> {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -49,6 +49,7 @@ fn build_harness(secret_hex: &str, mask_port: u16) -> PipelineHarness {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -1338,6 +1338,7 @@ async fn direct_relay_abort_midflight_releases_route_gauge() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -1448,6 +1449,7 @@ async fn direct_relay_cutover_midflight_releases_route_gauge() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -1570,6 +1572,7 @@ async fn direct_relay_cutover_storm_multi_session_keeps_generic_errors_and_relea
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -1803,6 +1806,7 @@ async fn negative_direct_relay_dc_connection_refused_fails_fast() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        100,
@@ -1897,6 +1901,7 @@ async fn adversarial_direct_relay_cutover_integrity() {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        100,
@@ -22,6 +22,7 @@ async fn adversarial_delayed_interface_lookup_does_not_consume_outcome_floor_bud

    let refresh_lock = LOCAL_INTERFACE_REFRESH_LOCK.get_or_init(|| AsyncMutex::new(()));
    let held_refresh_guard = refresh_lock.lock().await;
+    reset_local_interface_enumerations_for_tests();

    let (mut client, server) = duplex(1024);
    let started = Instant::now();
@@ -1,33 +1,21 @@
 use super::*;
-use std::panic::{AssertUnwindSafe, catch_unwind};

 #[test]
-fn blackhat_registry_poison_recovers_with_fail_closed_reset_and_pressure_accounting() {
+fn blackhat_registry_stale_order_entry_is_skipped_and_pressure_accounting_continues() {
    let shared = ProxySharedState::new();
    clear_relay_idle_pressure_state_for_testing_in_shared(shared.as_ref());

-    let _ = catch_unwind(AssertUnwindSafe(|| {
-        let mut guard = shared
-            .middle_relay
-            .relay_idle_registry
-            .lock()
-            .expect("registry lock must be acquired before poison");
-        guard.by_conn_id.insert(
-            999,
-            RelayIdleCandidateMeta {
-                mark_order_seq: 1,
-                mark_pressure_seq: 0,
-            },
-        );
-        guard.ordered.insert((1, 999));
-        panic!("intentional poison for idle-registry recovery");
-    }));
+    shared
+        .middle_relay
+        .relay_idle_registry
+        .ordered
+        .lock()
+        .insert((0, 999));

-    // Helper lock must recover from poison, reset stale state, and continue.
    assert!(mark_relay_idle_candidate_for_testing(shared.as_ref(), 42));
    assert_eq!(
        oldest_relay_idle_candidate_for_testing(shared.as_ref()),
-        Some(42)
+        Some(999)
    );

    let before = relay_pressure_event_seq_for_testing(shared.as_ref());
@@ -35,25 +23,43 @@ fn blackhat_registry_poison_recovers_with_fail_closed_reset_and_pressure_account
    let after = relay_pressure_event_seq_for_testing(shared.as_ref());
    assert!(
        after > before,
-        "pressure accounting must still advance after poison"
+        "pressure accounting must still advance with stale ordered entries"
+    );
+
+    let mut seen_pressure_seq = before;
+    assert!(maybe_evict_idle_candidate_on_pressure_for_testing(
+        shared.as_ref(),
+        42,
+        &mut seen_pressure_seq,
+        &Stats::new()
+    ));
+    assert_eq!(
+        oldest_relay_idle_candidate_for_testing(shared.as_ref()),
+        None
    );

    clear_relay_idle_pressure_state_for_testing_in_shared(shared.as_ref());
 }

 #[test]
-fn clear_state_helper_must_reset_poisoned_registry_for_deterministic_fifo_tests() {
+fn clear_state_helper_must_reset_split_registry_for_deterministic_fifo_tests() {
    let shared = ProxySharedState::new();
    clear_relay_idle_pressure_state_for_testing_in_shared(shared.as_ref());

-    let _ = catch_unwind(AssertUnwindSafe(|| {
-        let _guard = shared
-            .middle_relay
-            .relay_idle_registry
-            .lock()
-            .expect("registry lock must be acquired before poison");
-        panic!("intentional poison while lock held");
-    }));
+    shared.middle_relay.relay_idle_registry.by_conn_id.insert(
+        999,
+        RelayIdleCandidateMeta {
+            mark_order_seq: 1,
+            mark_pressure_seq: 0,
+        },
+    );
+    shared
+        .middle_relay
+        .relay_idle_registry
+        .ordered
+        .lock()
+        .insert((1, 999));
+    set_relay_pressure_state_for_testing(shared.as_ref(), 7, 6);

    clear_relay_idle_pressure_state_for_testing_in_shared(shared.as_ref());

@@ -61,6 +61,7 @@ fn new_client_harness() -> ClientHarness {
            selected_scope: String::new(),
            ipv4: None,
            ipv6: None,
+            prefer: None,
        }],
        1,
        1,
@@ -3,7 +3,9 @@ use crate::error::ProxyError;
 use crate::stats::Stats;
 use crate::stream::BufferPool;
 use std::io;
+use std::pin::Pin;
 use std::sync::Arc;
+use std::task::{Context, Poll};
 use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt, ReadBuf, duplex};
 use tokio::time::{Duration, timeout};

@@ -0,0 +1,266 @@
+use super::*;
+
+impl Stats {
+    pub fn apply_telemetry_policy(&self, policy: TelemetryPolicy) {
+        self.telemetry_core_enabled
+            .store(policy.core_enabled, Ordering::Relaxed);
+        self.telemetry_user_enabled
+            .store(policy.user_enabled, Ordering::Relaxed);
+        self.telemetry_me_level
+            .store(policy.me_level.as_u8(), Ordering::Relaxed);
+    }
+
+    pub fn telemetry_policy(&self) -> TelemetryPolicy {
+        TelemetryPolicy {
+            core_enabled: self.telemetry_core_enabled(),
+            user_enabled: self.telemetry_user_enabled(),
+            me_level: self.telemetry_me_level(),
+        }
+    }
+
+    pub fn increment_connects_all(&self) {
+        if self.telemetry_core_enabled() {
+            self.connects_all.fetch_add(1, Ordering::Relaxed);
+        }
+    }
+
+    pub fn increment_connects_bad_with_class(&self, class: &'static str) {
+        if !self.telemetry_core_enabled() {
+            return;
+        }
+        self.connects_bad.fetch_add(1, Ordering::Relaxed);
+        let entry = self
+            .connects_bad_classes
+            .entry(class)
+            .or_insert_with(|| AtomicU64::new(0));
+        entry.fetch_add(1, Ordering::Relaxed);
+    }
+
+    pub fn increment_connects_bad(&self) {
+        self.increment_connects_bad_with_class("other");
+    }
+
+    pub fn increment_handshake_failure_class(&self, class: &'static str) {
+        if !self.telemetry_core_enabled() {
+            return;
+        }
+        let entry = self
+            .handshake_failure_classes
+            .entry(class)
+            .or_insert_with(|| AtomicU64::new(0));
+        entry.fetch_add(1, Ordering::Relaxed);
+    }
+    pub fn increment_current_connections_direct(&self) {
+        self.current_connections_direct
+            .fetch_add(1, Ordering::Relaxed);
+    }
+    pub fn decrement_current_connections_direct(&self) {
+        Self::decrement_atomic_saturating(&self.current_connections_direct);
+    }
+    pub fn increment_current_connections_me(&self) {
+        self.current_connections_me.fetch_add(1, Ordering::Relaxed);
+    }
+    pub fn decrement_current_connections_me(&self) {
+        Self::decrement_atomic_saturating(&self.current_connections_me);
+    }
+
+    pub fn acquire_direct_connection_lease(self: &Arc<Self>) -> RouteConnectionLease {
+        self.increment_current_connections_direct();
+        RouteConnectionLease::new(self.clone(), RouteConnectionGauge::Direct)
+    }
+
+    pub fn acquire_me_connection_lease(self: &Arc<Self>) -> RouteConnectionLease {
+        self.increment_current_connections_me();
+        RouteConnectionLease::new(self.clone(), RouteConnectionGauge::Middle)
+    }
+
+    pub(super) fn decrement_route_cutover_parked_direct(&self) {
+        Self::decrement_atomic_saturating(&self.route_cutover_parked_direct_current);
+    }
+
+    pub(super) fn decrement_route_cutover_parked_middle(&self) {
+        Self::decrement_atomic_saturating(&self.route_cutover_parked_middle_current);
+    }
+
+    pub fn acquire_direct_cutover_park_lease(self: &Arc<Self>) -> RouteCutoverParkLease {
+        self.route_cutover_parked_direct_current
+            .fetch_add(1, Ordering::Relaxed);
+        self.route_cutover_parked_direct_total
+            .fetch_add(1, Ordering::Relaxed);
+        RouteCutoverParkLease::new(self.clone(), RouteCutoverParkGauge::Direct)
+    }
+
+    pub fn acquire_middle_cutover_park_lease(self: &Arc<Self>) -> RouteCutoverParkLease {
+        self.route_cutover_parked_middle_current
+            .fetch_add(1, Ordering::Relaxed);
+        self.route_cutover_parked_middle_total
+            .fetch_add(1, Ordering::Relaxed);
+        RouteCutoverParkLease::new(self.clone(), RouteCutoverParkGauge::Middle)
+    }
+    pub fn increment_handshake_timeouts(&self) {
+        if self.telemetry_core_enabled() {
+            self.handshake_timeouts.fetch_add(1, Ordering::Relaxed);
+        }
+    }
+
+    pub fn increment_accept_permit_timeout_total(&self) {
+        if self.telemetry_core_enabled() {
+            self.accept_permit_timeout_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+
+    pub fn set_conntrack_control_enabled(&self, enabled: bool) {
+        self.conntrack_control_enabled_gauge
+            .store(enabled, Ordering::Relaxed);
+    }
+
+    pub fn set_conntrack_control_available(&self, available: bool) {
+        self.conntrack_control_available_gauge
+            .store(available, Ordering::Relaxed);
+    }
+
+    pub fn set_conntrack_pressure_active(&self, active: bool) {
+        self.conntrack_pressure_active_gauge
+            .store(active, Ordering::Relaxed);
+    }
+
+    pub fn set_conntrack_event_queue_depth(&self, depth: u64) {
+        self.conntrack_event_queue_depth_gauge
+            .store(depth, Ordering::Relaxed);
+    }
+
+    pub fn set_conntrack_rule_apply_ok(&self, ok: bool) {
+        self.conntrack_rule_apply_ok_gauge
+            .store(ok, Ordering::Relaxed);
+    }
+
+    pub fn increment_conntrack_delete_attempt_total(&self) {
+        if self.telemetry_core_enabled() {
+            self.conntrack_delete_attempt_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+
+    pub fn increment_conntrack_delete_success_total(&self) {
+        if self.telemetry_core_enabled() {
+            self.conntrack_delete_success_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+
+    pub fn increment_conntrack_delete_not_found_total(&self) {
+        if self.telemetry_core_enabled() {
+            self.conntrack_delete_not_found_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+
+    pub fn increment_conntrack_delete_error_total(&self) {
+        if self.telemetry_core_enabled() {
+            self.conntrack_delete_error_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+
+    pub fn increment_conntrack_close_event_drop_total(&self) {
+        if self.telemetry_core_enabled() {
+            self.conntrack_close_event_drop_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+
+    pub fn increment_upstream_connect_attempt_total(&self) {
+        if self.telemetry_core_enabled() {
+            self.upstream_connect_attempt_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_upstream_connect_success_total(&self) {
+        if self.telemetry_core_enabled() {
+            self.upstream_connect_success_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_upstream_connect_fail_total(&self) {
+        if self.telemetry_core_enabled() {
+            self.upstream_connect_fail_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_upstream_connect_failfast_hard_error_total(&self) {
+        if self.telemetry_core_enabled() {
+            self.upstream_connect_failfast_hard_error_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn observe_upstream_connect_attempts_per_request(&self, attempts: u32) {
+        if !self.telemetry_core_enabled() {
+            return;
+        }
+        match attempts {
+            0 => {}
+            1 => {
+                self.upstream_connect_attempts_bucket_1
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            2 => {
+                self.upstream_connect_attempts_bucket_2
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            3..=4 => {
+                self.upstream_connect_attempts_bucket_3_4
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            _ => {
+                self.upstream_connect_attempts_bucket_gt_4
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+        }
+    }
+    pub fn observe_upstream_connect_duration_ms(&self, duration_ms: u64, success: bool) {
+        if !self.telemetry_core_enabled() {
+            return;
+        }
+        let bucket = match duration_ms {
+            0..=100 => 0u8,
+            101..=500 => 1u8,
+            501..=1000 => 2u8,
+            _ => 3u8,
+        };
+        match (success, bucket) {
+            (true, 0) => {
+                self.upstream_connect_duration_success_bucket_le_100ms
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            (true, 1) => {
+                self.upstream_connect_duration_success_bucket_101_500ms
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            (true, 2) => {
+                self.upstream_connect_duration_success_bucket_501_1000ms
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            (true, _) => {
+                self.upstream_connect_duration_success_bucket_gt_1000ms
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            (false, 0) => {
+                self.upstream_connect_duration_fail_bucket_le_100ms
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            (false, 1) => {
+                self.upstream_connect_duration_fail_bucket_101_500ms
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            (false, 2) => {
+                self.upstream_connect_duration_fail_bucket_501_1000ms
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            (false, _) => {
+                self.upstream_connect_duration_fail_bucket_gt_1000ms
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+        }
+    }
+}
@@ -0,0 +1,283 @@
+use super::*;
+
+impl Stats {
+    pub fn get_connects_all(&self) -> u64 {
+        self.connects_all.load(Ordering::Relaxed)
+    }
+    pub fn get_connects_bad(&self) -> u64 {
+        self.connects_bad.load(Ordering::Relaxed)
+    }
+
+    pub fn get_connects_bad_class_counts(&self) -> Vec<(String, u64)> {
+        let mut out: Vec<(String, u64)> = self
+            .connects_bad_classes
+            .iter()
+            .map(|entry| {
+                (
+                    entry.key().to_string(),
+                    entry.value().load(Ordering::Relaxed),
+                )
+            })
+            .collect();
+        out.sort_by(|a, b| a.0.cmp(&b.0));
+        out
+    }
+
+    pub fn get_handshake_failure_class_counts(&self) -> Vec<(String, u64)> {
+        let mut out: Vec<(String, u64)> = self
+            .handshake_failure_classes
+            .iter()
+            .map(|entry| {
+                (
+                    entry.key().to_string(),
+                    entry.value().load(Ordering::Relaxed),
+                )
+            })
+            .collect();
+        out.sort_by(|a, b| a.0.cmp(&b.0));
+        out
+    }
+
+    pub fn get_accept_permit_timeout_total(&self) -> u64 {
+        self.accept_permit_timeout_total.load(Ordering::Relaxed)
+    }
+    pub fn get_current_connections_direct(&self) -> u64 {
+        self.current_connections_direct.load(Ordering::Relaxed)
+    }
+    pub fn get_current_connections_me(&self) -> u64 {
+        self.current_connections_me.load(Ordering::Relaxed)
+    }
+    pub fn get_route_cutover_parked_direct_current(&self) -> u64 {
+        self.route_cutover_parked_direct_current
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_route_cutover_parked_middle_current(&self) -> u64 {
+        self.route_cutover_parked_middle_current
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_route_cutover_parked_direct_total(&self) -> u64 {
+        self.route_cutover_parked_direct_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_route_cutover_parked_middle_total(&self) -> u64 {
+        self.route_cutover_parked_middle_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_current_connections_total(&self) -> u64 {
+        self.get_current_connections_direct()
+            .saturating_add(self.get_current_connections_me())
+    }
+    pub fn get_conntrack_control_enabled(&self) -> bool {
+        self.conntrack_control_enabled_gauge.load(Ordering::Relaxed)
+    }
+    pub fn get_conntrack_control_available(&self) -> bool {
+        self.conntrack_control_available_gauge
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_conntrack_pressure_active(&self) -> bool {
+        self.conntrack_pressure_active_gauge.load(Ordering::Relaxed)
+    }
+    pub fn get_conntrack_event_queue_depth(&self) -> u64 {
+        self.conntrack_event_queue_depth_gauge
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_conntrack_rule_apply_ok(&self) -> bool {
+        self.conntrack_rule_apply_ok_gauge.load(Ordering::Relaxed)
+    }
+    pub fn get_conntrack_delete_attempt_total(&self) -> u64 {
+        self.conntrack_delete_attempt_total.load(Ordering::Relaxed)
+    }
+    pub fn get_conntrack_delete_success_total(&self) -> u64 {
+        self.conntrack_delete_success_total.load(Ordering::Relaxed)
+    }
+    pub fn get_conntrack_delete_not_found_total(&self) -> u64 {
+        self.conntrack_delete_not_found_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_conntrack_delete_error_total(&self) -> u64 {
+        self.conntrack_delete_error_total.load(Ordering::Relaxed)
+    }
+    pub fn get_conntrack_close_event_drop_total(&self) -> u64 {
+        self.conntrack_close_event_drop_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_keepalive_sent(&self) -> u64 {
+        self.me_keepalive_sent.load(Ordering::Relaxed)
+    }
+    pub fn get_me_keepalive_failed(&self) -> u64 {
+        self.me_keepalive_failed.load(Ordering::Relaxed)
+    }
+    pub fn get_me_keepalive_pong(&self) -> u64 {
+        self.me_keepalive_pong.load(Ordering::Relaxed)
+    }
+    pub fn get_me_keepalive_timeout(&self) -> u64 {
+        self.me_keepalive_timeout.load(Ordering::Relaxed)
+    }
+    pub fn get_me_rpc_proxy_req_signal_sent_total(&self) -> u64 {
+        self.me_rpc_proxy_req_signal_sent_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_rpc_proxy_req_signal_failed_total(&self) -> u64 {
+        self.me_rpc_proxy_req_signal_failed_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_rpc_proxy_req_signal_skipped_no_meta_total(&self) -> u64 {
+        self.me_rpc_proxy_req_signal_skipped_no_meta_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_rpc_proxy_req_signal_response_total(&self) -> u64 {
+        self.me_rpc_proxy_req_signal_response_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_rpc_proxy_req_signal_close_sent_total(&self) -> u64 {
+        self.me_rpc_proxy_req_signal_close_sent_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_reconnect_attempts(&self) -> u64 {
+        self.me_reconnect_attempts.load(Ordering::Relaxed)
+    }
+    pub fn get_me_reconnect_success(&self) -> u64 {
+        self.me_reconnect_success.load(Ordering::Relaxed)
+    }
+    pub fn get_me_handshake_reject_total(&self) -> u64 {
+        self.me_handshake_reject_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_reader_eof_total(&self) -> u64 {
+        self.me_reader_eof_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_idle_close_by_peer_total(&self) -> u64 {
+        self.me_idle_close_by_peer_total.load(Ordering::Relaxed)
+    }
+    pub fn get_relay_idle_soft_mark_total(&self) -> u64 {
+        self.relay_idle_soft_mark_total.load(Ordering::Relaxed)
+    }
+    pub fn get_relay_idle_hard_close_total(&self) -> u64 {
+        self.relay_idle_hard_close_total.load(Ordering::Relaxed)
+    }
+    pub fn get_relay_pressure_evict_total(&self) -> u64 {
+        self.relay_pressure_evict_total.load(Ordering::Relaxed)
+    }
+    pub fn get_relay_protocol_desync_close_total(&self) -> u64 {
+        self.relay_protocol_desync_close_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_crc_mismatch(&self) -> u64 {
+        self.me_crc_mismatch.load(Ordering::Relaxed)
+    }
+    pub fn get_me_seq_mismatch(&self) -> u64 {
+        self.me_seq_mismatch.load(Ordering::Relaxed)
+    }
+    pub fn get_me_endpoint_quarantine_total(&self) -> u64 {
+        self.me_endpoint_quarantine_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_endpoint_quarantine_unexpected_total(&self) -> u64 {
+        self.me_endpoint_quarantine_unexpected_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_endpoint_quarantine_draining_suppressed_total(&self) -> u64 {
+        self.me_endpoint_quarantine_draining_suppressed_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_kdf_drift_total(&self) -> u64 {
+        self.me_kdf_drift_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_kdf_port_only_drift_total(&self) -> u64 {
+        self.me_kdf_port_only_drift_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_hardswap_pending_reuse_total(&self) -> u64 {
+        self.me_hardswap_pending_reuse_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_hardswap_pending_ttl_expired_total(&self) -> u64 {
+        self.me_hardswap_pending_ttl_expired_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_single_endpoint_outage_enter_total(&self) -> u64 {
+        self.me_single_endpoint_outage_enter_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_single_endpoint_outage_exit_total(&self) -> u64 {
+        self.me_single_endpoint_outage_exit_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_single_endpoint_outage_reconnect_attempt_total(&self) -> u64 {
+        self.me_single_endpoint_outage_reconnect_attempt_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_single_endpoint_outage_reconnect_success_total(&self) -> u64 {
+        self.me_single_endpoint_outage_reconnect_success_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_single_endpoint_quarantine_bypass_total(&self) -> u64 {
+        self.me_single_endpoint_quarantine_bypass_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_single_endpoint_shadow_rotate_total(&self) -> u64 {
+        self.me_single_endpoint_shadow_rotate_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_single_endpoint_shadow_rotate_skipped_quarantine_total(&self) -> u64 {
+        self.me_single_endpoint_shadow_rotate_skipped_quarantine_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_floor_mode_switch_total(&self) -> u64 {
+        self.me_floor_mode_switch_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_floor_mode_switch_static_to_adaptive_total(&self) -> u64 {
+        self.me_floor_mode_switch_static_to_adaptive_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_floor_mode_switch_adaptive_to_static_total(&self) -> u64 {
+        self.me_floor_mode_switch_adaptive_to_static_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_floor_cpu_cores_detected_gauge(&self) -> u64 {
+        self.me_floor_cpu_cores_detected_gauge
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_floor_cpu_cores_effective_gauge(&self) -> u64 {
+        self.me_floor_cpu_cores_effective_gauge
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_floor_global_cap_raw_gauge(&self) -> u64 {
+        self.me_floor_global_cap_raw_gauge.load(Ordering::Relaxed)
+    }
+    pub fn get_me_floor_global_cap_effective_gauge(&self) -> u64 {
+        self.me_floor_global_cap_effective_gauge
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_floor_target_writers_total_gauge(&self) -> u64 {
+        self.me_floor_target_writers_total_gauge
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_floor_active_cap_configured_gauge(&self) -> u64 {
+        self.me_floor_active_cap_configured_gauge
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_floor_active_cap_effective_gauge(&self) -> u64 {
+        self.me_floor_active_cap_effective_gauge
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_floor_warm_cap_configured_gauge(&self) -> u64 {
+        self.me_floor_warm_cap_configured_gauge
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_floor_warm_cap_effective_gauge(&self) -> u64 {
+        self.me_floor_warm_cap_effective_gauge
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_writers_active_current_gauge(&self) -> u64 {
+        self.me_writers_active_current_gauge.load(Ordering::Relaxed)
+    }
+    pub fn get_me_writers_warm_current_gauge(&self) -> u64 {
+        self.me_writers_warm_current_gauge.load(Ordering::Relaxed)
+    }
+    pub fn get_me_floor_cap_block_total(&self) -> u64 {
+        self.me_floor_cap_block_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_floor_swap_idle_total(&self) -> u64 {
+        self.me_floor_swap_idle_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_floor_swap_idle_failed_total(&self) -> u64 {
+        self.me_floor_swap_idle_failed_total.load(Ordering::Relaxed)
+    }
+}
@@ -0,0 +1,208 @@
+use std::sync::Arc;
+use std::sync::atomic::{AtomicU64, Ordering};
+use std::time::{Duration, SystemTime, UNIX_EPOCH};
+
+use crate::config::MeTelemetryLevel;
+
+use super::*;
+
+impl Stats {
+    pub(super) fn telemetry_me_level(&self) -> MeTelemetryLevel {
+        MeTelemetryLevel::from_u8(self.telemetry_me_level.load(Ordering::Relaxed))
+    }
+
+    pub(super) fn telemetry_core_enabled(&self) -> bool {
+        self.telemetry_core_enabled.load(Ordering::Relaxed)
+    }
+
+    pub(super) fn telemetry_user_enabled(&self) -> bool {
+        self.telemetry_user_enabled.load(Ordering::Relaxed)
+    }
+
+    pub(super) fn telemetry_me_allows_normal(&self) -> bool {
+        self.telemetry_me_level().allows_normal()
+    }
+
+    pub(super) fn telemetry_me_allows_debug(&self) -> bool {
+        self.telemetry_me_level().allows_debug()
+    }
+
+    pub(super) fn decrement_atomic_saturating(counter: &AtomicU64) {
+        let mut current = counter.load(Ordering::Relaxed);
+        loop {
+            if current == 0 {
+                break;
+            }
+            match counter.compare_exchange_weak(
+                current,
+                current - 1,
+                Ordering::Relaxed,
+                Ordering::Relaxed,
+            ) {
+                Ok(_) => break,
+                Err(actual) => current = actual,
+            }
+        }
+    }
+
+    pub(super) fn now_epoch_secs() -> u64 {
+        SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .unwrap_or_default()
+            .as_secs()
+    }
+
+    pub(super) fn refresh_cached_epoch_secs(&self) -> u64 {
+        let now_epoch_secs = Self::now_epoch_secs();
+        self.cached_epoch_secs
+            .store(now_epoch_secs, Ordering::Relaxed);
+        now_epoch_secs
+    }
+
+    pub(super) fn cached_epoch_secs(&self) -> u64 {
+        let cached = self.cached_epoch_secs.load(Ordering::Relaxed);
+        if cached != 0 {
+            return cached;
+        }
+        self.refresh_cached_epoch_secs()
+    }
+
+    pub(super) fn touch_user_stats(&self, stats: &UserStats) {
+        stats
+            .last_seen_epoch_secs
+            .store(self.cached_epoch_secs(), Ordering::Relaxed);
+    }
+
+    pub(crate) fn get_or_create_user_stats_handle(&self, user: &str) -> Arc<UserStats> {
+        if let Some(existing) = self.user_stats.get(user) {
+            let handle = Arc::clone(existing.value());
+            self.touch_user_stats(handle.as_ref());
+            return handle;
+        }
+
+        let entry = self.user_stats.entry(user.to_string()).or_default();
+        if entry.last_seen_epoch_secs.load(Ordering::Relaxed) == 0 {
+            self.touch_user_stats(entry.value().as_ref());
+        }
+        Arc::clone(entry.value())
+    }
+
+    pub(crate) async fn run_periodic_user_stats_maintenance(self: Arc<Self>) {
+        let mut interval = tokio::time::interval(Duration::from_secs(60));
+        loop {
+            interval.tick().await;
+            self.maybe_cleanup_user_stats();
+        }
+    }
+
+    #[inline]
+    pub(crate) fn add_user_octets_from_handle(&self, user_stats: &UserStats, bytes: u64) {
+        if !self.telemetry_user_enabled() {
+            return;
+        }
+        self.touch_user_stats(user_stats);
+        user_stats
+            .octets_from_client
+            .fetch_add(bytes, Ordering::Relaxed);
+    }
+
+    #[inline]
+    pub(crate) fn add_user_octets_to_handle(&self, user_stats: &UserStats, bytes: u64) {
+        if !self.telemetry_user_enabled() {
+            return;
+        }
+        self.touch_user_stats(user_stats);
+        user_stats
+            .octets_to_client
+            .fetch_add(bytes, Ordering::Relaxed);
+    }
+
+    #[inline]
+    pub(crate) fn add_user_traffic_from_handle(&self, user_stats: &UserStats, bytes: u64) {
+        if !self.telemetry_user_enabled() {
+            return;
+        }
+        self.touch_user_stats(user_stats);
+        user_stats
+            .octets_from_client
+            .fetch_add(bytes, Ordering::Relaxed);
+        user_stats.msgs_from_client.fetch_add(1, Ordering::Relaxed);
+    }
+
+    #[inline]
+    pub(crate) fn add_user_traffic_to_handle(&self, user_stats: &UserStats, bytes: u64) {
+        if !self.telemetry_user_enabled() {
+            return;
+        }
+        self.touch_user_stats(user_stats);
+        user_stats
+            .octets_to_client
+            .fetch_add(bytes, Ordering::Relaxed);
+        user_stats.msgs_to_client.fetch_add(1, Ordering::Relaxed);
+    }
+
+    #[inline]
+    pub(crate) fn increment_user_msgs_from_handle(&self, user_stats: &UserStats) {
+        if !self.telemetry_user_enabled() {
+            return;
+        }
+        self.touch_user_stats(user_stats);
+        user_stats.msgs_from_client.fetch_add(1, Ordering::Relaxed);
+    }
+
+    #[inline]
+    pub(crate) fn increment_user_msgs_to_handle(&self, user_stats: &UserStats) {
+        if !self.telemetry_user_enabled() {
+            return;
+        }
+        self.touch_user_stats(user_stats);
+        user_stats.msgs_to_client.fetch_add(1, Ordering::Relaxed);
+    }
+
+    /// Charges already committed bytes in a post-I/O path.
+    ///
+    /// This helper is intentionally separate from `quota_try_reserve` to avoid
+    /// mixing reserve and post-charge on a single I/O event.
+    #[inline]
+    pub(crate) fn quota_charge_post_write(&self, user_stats: &UserStats, bytes: u64) -> u64 {
+        self.touch_user_stats(user_stats);
+        user_stats
+            .quota_used
+            .fetch_add(bytes, Ordering::Relaxed)
+            .saturating_add(bytes)
+    }
+
+    pub(super) fn maybe_cleanup_user_stats(&self) {
+        const USER_STATS_CLEANUP_INTERVAL_SECS: u64 = 60;
+        const USER_STATS_IDLE_TTL_SECS: u64 = 24 * 60 * 60;
+
+        let now_epoch_secs = self.refresh_cached_epoch_secs();
+        let last_cleanup_epoch_secs = self
+            .user_stats_last_cleanup_epoch_secs
+            .load(Ordering::Relaxed);
+        if now_epoch_secs.saturating_sub(last_cleanup_epoch_secs) < USER_STATS_CLEANUP_INTERVAL_SECS
+        {
+            return;
+        }
+        if self
+            .user_stats_last_cleanup_epoch_secs
+            .compare_exchange(
+                last_cleanup_epoch_secs,
+                now_epoch_secs,
+                Ordering::AcqRel,
+                Ordering::Relaxed,
+            )
+            .is_err()
+        {
+            return;
+        }
+
+        self.user_stats.retain(|_, stats| {
+            if stats.curr_connects.load(Ordering::Relaxed) > 0 {
+                return true;
+            }
+            let last_seen_epoch_secs = stats.last_seen_epoch_secs.load(Ordering::Relaxed);
+            now_epoch_secs.saturating_sub(last_seen_epoch_secs) <= USER_STATS_IDLE_TTL_SECS
+        });
+    }
+}
@@ -0,0 +1,442 @@
+use super::*;
+
+impl Stats {
+    pub fn increment_me_keepalive_sent(&self) {
+        if self.telemetry_me_allows_debug() {
+            self.me_keepalive_sent.fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_keepalive_failed(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_keepalive_failed.fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_keepalive_pong(&self) {
+        if self.telemetry_me_allows_debug() {
+            self.me_keepalive_pong.fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_keepalive_timeout(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_keepalive_timeout.fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_keepalive_timeout_by(&self, value: u64) {
+        if self.telemetry_me_allows_normal() {
+            self.me_keepalive_timeout
+                .fetch_add(value, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_rpc_proxy_req_signal_sent_total(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_rpc_proxy_req_signal_sent_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_rpc_proxy_req_signal_failed_total(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_rpc_proxy_req_signal_failed_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_rpc_proxy_req_signal_skipped_no_meta_total(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_rpc_proxy_req_signal_skipped_no_meta_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_rpc_proxy_req_signal_response_total(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_rpc_proxy_req_signal_response_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_rpc_proxy_req_signal_close_sent_total(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_rpc_proxy_req_signal_close_sent_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_reconnect_attempt(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_reconnect_attempts.fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_reconnect_success(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_reconnect_success.fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_handshake_reject_total(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_handshake_reject_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_handshake_error_code(&self, code: i32) {
+        if !self.telemetry_me_allows_normal() {
+            return;
+        }
+        let entry = self
+            .me_handshake_error_codes
+            .entry(code)
+            .or_insert_with(|| AtomicU64::new(0));
+        entry.fetch_add(1, Ordering::Relaxed);
+    }
+    pub fn increment_me_reader_eof_total(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_reader_eof_total.fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_idle_close_by_peer_total(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_idle_close_by_peer_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_relay_idle_soft_mark_total(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.relay_idle_soft_mark_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_relay_idle_hard_close_total(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.relay_idle_hard_close_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_relay_pressure_evict_total(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.relay_pressure_evict_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_relay_protocol_desync_close_total(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.relay_protocol_desync_close_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_crc_mismatch(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_crc_mismatch.fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_seq_mismatch(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_seq_mismatch.fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_route_drop_no_conn(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_route_drop_no_conn.fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_route_drop_channel_closed(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_route_drop_channel_closed
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_route_drop_queue_full(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_route_drop_queue_full
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_route_drop_queue_full_base(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_route_drop_queue_full_base
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_route_drop_queue_full_high(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_route_drop_queue_full_high
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn set_me_fair_pressure_state_gauge(&self, value: u64) {
+        if self.telemetry_me_allows_normal() {
+            self.me_fair_pressure_state_gauge
+                .store(value, Ordering::Relaxed);
+        }
+    }
+    pub fn set_me_fair_active_flows_gauge(&self, value: u64) {
+        if self.telemetry_me_allows_normal() {
+            self.me_fair_active_flows_gauge
+                .store(value, Ordering::Relaxed);
+        }
+    }
+    pub fn set_me_fair_queued_bytes_gauge(&self, value: u64) {
+        if self.telemetry_me_allows_normal() {
+            self.me_fair_queued_bytes_gauge
+                .store(value, Ordering::Relaxed);
+        }
+    }
+    pub fn set_me_fair_standing_flows_gauge(&self, value: u64) {
+        if self.telemetry_me_allows_normal() {
+            self.me_fair_standing_flows_gauge
+                .store(value, Ordering::Relaxed);
+        }
+    }
+    pub fn set_me_fair_backpressured_flows_gauge(&self, value: u64) {
+        if self.telemetry_me_allows_normal() {
+            self.me_fair_backpressured_flows_gauge
+                .store(value, Ordering::Relaxed);
+        }
+    }
+    pub fn add_me_fair_scheduler_rounds_total(&self, value: u64) {
+        if self.telemetry_me_allows_normal() && value > 0 {
+            self.me_fair_scheduler_rounds_total
+                .fetch_add(value, Ordering::Relaxed);
+        }
+    }
+    pub fn add_me_fair_deficit_grants_total(&self, value: u64) {
+        if self.telemetry_me_allows_normal() && value > 0 {
+            self.me_fair_deficit_grants_total
+                .fetch_add(value, Ordering::Relaxed);
+        }
+    }
+    pub fn add_me_fair_deficit_skips_total(&self, value: u64) {
+        if self.telemetry_me_allows_normal() && value > 0 {
+            self.me_fair_deficit_skips_total
+                .fetch_add(value, Ordering::Relaxed);
+        }
+    }
+    pub fn add_me_fair_enqueue_rejects_total(&self, value: u64) {
+        if self.telemetry_me_allows_normal() && value > 0 {
+            self.me_fair_enqueue_rejects_total
+                .fetch_add(value, Ordering::Relaxed);
+        }
+    }
+    pub fn add_me_fair_shed_drops_total(&self, value: u64) {
+        if self.telemetry_me_allows_normal() && value > 0 {
+            self.me_fair_shed_drops_total
+                .fetch_add(value, Ordering::Relaxed);
+        }
+    }
+    pub fn add_me_fair_penalties_total(&self, value: u64) {
+        if self.telemetry_me_allows_normal() && value > 0 {
+            self.me_fair_penalties_total
+                .fetch_add(value, Ordering::Relaxed);
+        }
+    }
+    pub fn add_me_fair_downstream_stalls_total(&self, value: u64) {
+        if self.telemetry_me_allows_normal() && value > 0 {
+            self.me_fair_downstream_stalls_total
+                .fetch_add(value, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_d2c_batches_total(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_d2c_batches_total.fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn add_me_d2c_batch_frames_total(&self, frames: u64) {
+        if self.telemetry_me_allows_normal() {
+            self.me_d2c_batch_frames_total
+                .fetch_add(frames, Ordering::Relaxed);
+        }
+    }
+    pub fn add_me_d2c_batch_bytes_total(&self, bytes: u64) {
+        if self.telemetry_me_allows_normal() {
+            self.me_d2c_batch_bytes_total
+                .fetch_add(bytes, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_d2c_flush_reason(&self, reason: MeD2cFlushReason) {
+        if !self.telemetry_me_allows_normal() {
+            return;
+        }
+        match reason {
+            MeD2cFlushReason::QueueDrain => {
+                self.me_d2c_flush_reason_queue_drain_total
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            MeD2cFlushReason::BatchFrames => {
+                self.me_d2c_flush_reason_batch_frames_total
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            MeD2cFlushReason::BatchBytes => {
+                self.me_d2c_flush_reason_batch_bytes_total
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            MeD2cFlushReason::MaxDelay => {
+                self.me_d2c_flush_reason_max_delay_total
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            MeD2cFlushReason::AckImmediate => {
+                self.me_d2c_flush_reason_ack_immediate_total
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            MeD2cFlushReason::Close => {
+                self.me_d2c_flush_reason_close_total
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+        }
+    }
+    pub fn increment_me_d2c_data_frames_total(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_d2c_data_frames_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_d2c_ack_frames_total(&self) {
+        if self.telemetry_me_allows_normal() {
+            self.me_d2c_ack_frames_total.fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn add_me_d2c_payload_bytes_total(&self, bytes: u64) {
+        if self.telemetry_me_allows_normal() {
+            self.me_d2c_payload_bytes_total
+                .fetch_add(bytes, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_d2c_write_mode(&self, mode: MeD2cWriteMode) {
+        if !self.telemetry_me_allows_normal() {
+            return;
+        }
+        match mode {
+            MeD2cWriteMode::Coalesced => {
+                self.me_d2c_write_mode_coalesced_total
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            MeD2cWriteMode::Split => {
+                self.me_d2c_write_mode_split_total
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+        }
+    }
+    pub fn increment_me_d2c_quota_reject_total(&self, stage: MeD2cQuotaRejectStage) {
+        if !self.telemetry_me_allows_normal() {
+            return;
+        }
+        match stage {
+            MeD2cQuotaRejectStage::PreWrite => {
+                self.me_d2c_quota_reject_pre_write_total
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            MeD2cQuotaRejectStage::PostWrite => {
+                self.me_d2c_quota_reject_post_write_total
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+        }
+    }
+    pub fn observe_me_d2c_frame_buf_shrink(&self, bytes_freed: u64) {
+        if !self.telemetry_me_allows_normal() {
+            return;
+        }
+        self.me_d2c_frame_buf_shrink_total
+            .fetch_add(1, Ordering::Relaxed);
+        self.me_d2c_frame_buf_shrink_bytes_total
+            .fetch_add(bytes_freed, Ordering::Relaxed);
+    }
+    pub fn observe_me_d2c_batch_frames(&self, frames: u64) {
+        if !self.telemetry_me_allows_debug() {
+            return;
+        }
+        match frames {
+            0 => {}
+            1 => {
+                self.me_d2c_batch_frames_bucket_1
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            2..=4 => {
+                self.me_d2c_batch_frames_bucket_2_4
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            5..=8 => {
+                self.me_d2c_batch_frames_bucket_5_8
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            9..=16 => {
+                self.me_d2c_batch_frames_bucket_9_16
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            17..=32 => {
+                self.me_d2c_batch_frames_bucket_17_32
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            _ => {
+                self.me_d2c_batch_frames_bucket_gt_32
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+        }
+    }
+    pub fn observe_me_d2c_batch_bytes(&self, bytes: u64) {
+        if !self.telemetry_me_allows_debug() {
+            return;
+        }
+        match bytes {
+            0..=1024 => {
+                self.me_d2c_batch_bytes_bucket_0_1k
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            1025..=4096 => {
+                self.me_d2c_batch_bytes_bucket_1k_4k
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            4097..=16_384 => {
+                self.me_d2c_batch_bytes_bucket_4k_16k
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            16_385..=65_536 => {
+                self.me_d2c_batch_bytes_bucket_16k_64k
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            65_537..=131_072 => {
+                self.me_d2c_batch_bytes_bucket_64k_128k
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            _ => {
+                self.me_d2c_batch_bytes_bucket_gt_128k
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+        }
+    }
+    pub fn observe_me_d2c_flush_duration_us(&self, duration_us: u64) {
+        if !self.telemetry_me_allows_debug() {
+            return;
+        }
+        match duration_us {
+            0..=50 => {
+                self.me_d2c_flush_duration_us_bucket_0_50
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            51..=200 => {
+                self.me_d2c_flush_duration_us_bucket_51_200
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            201..=1000 => {
+                self.me_d2c_flush_duration_us_bucket_201_1000
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            1001..=5000 => {
+                self.me_d2c_flush_duration_us_bucket_1001_5000
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            5001..=20_000 => {
+                self.me_d2c_flush_duration_us_bucket_5001_20000
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+            _ => {
+                self.me_d2c_flush_duration_us_bucket_gt_20000
+                    .fetch_add(1, Ordering::Relaxed);
+            }
+        }
+    }
+    pub fn increment_me_d2c_batch_timeout_armed_total(&self) {
+        if self.telemetry_me_allows_debug() {
+            self.me_d2c_batch_timeout_armed_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+    pub fn increment_me_d2c_batch_timeout_fired_total(&self) {
+        if self.telemetry_me_allows_debug() {
+            self.me_d2c_batch_timeout_fired_total
+                .fetch_add(1, Ordering::Relaxed);
+        }
+    }
+}
@@ -0,0 +1,398 @@
+use super::*;
+
+impl Stats {
+    pub fn get_me_handshake_error_code_counts(&self) -> Vec<(i32, u64)> {
+        let mut out: Vec<(i32, u64)> = self
+            .me_handshake_error_codes
+            .iter()
+            .map(|entry| (*entry.key(), entry.value().load(Ordering::Relaxed)))
+            .collect();
+        out.sort_by_key(|(code, _)| *code);
+        out
+    }
+    pub fn get_me_route_drop_no_conn(&self) -> u64 {
+        self.me_route_drop_no_conn.load(Ordering::Relaxed)
+    }
+    pub fn get_me_route_drop_channel_closed(&self) -> u64 {
+        self.me_route_drop_channel_closed.load(Ordering::Relaxed)
+    }
+    pub fn get_me_route_drop_queue_full(&self) -> u64 {
+        self.me_route_drop_queue_full.load(Ordering::Relaxed)
+    }
+    pub fn get_me_route_drop_queue_full_base(&self) -> u64 {
+        self.me_route_drop_queue_full_base.load(Ordering::Relaxed)
+    }
+    pub fn get_me_route_drop_queue_full_high(&self) -> u64 {
+        self.me_route_drop_queue_full_high.load(Ordering::Relaxed)
+    }
+    pub fn get_me_fair_pressure_state_gauge(&self) -> u64 {
+        self.me_fair_pressure_state_gauge.load(Ordering::Relaxed)
+    }
+    pub fn get_me_fair_active_flows_gauge(&self) -> u64 {
+        self.me_fair_active_flows_gauge.load(Ordering::Relaxed)
+    }
+    pub fn get_me_fair_queued_bytes_gauge(&self) -> u64 {
+        self.me_fair_queued_bytes_gauge.load(Ordering::Relaxed)
+    }
+    pub fn get_me_fair_standing_flows_gauge(&self) -> u64 {
+        self.me_fair_standing_flows_gauge.load(Ordering::Relaxed)
+    }
+    pub fn get_me_fair_backpressured_flows_gauge(&self) -> u64 {
+        self.me_fair_backpressured_flows_gauge
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_fair_scheduler_rounds_total(&self) -> u64 {
+        self.me_fair_scheduler_rounds_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_fair_deficit_grants_total(&self) -> u64 {
+        self.me_fair_deficit_grants_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_fair_deficit_skips_total(&self) -> u64 {
+        self.me_fair_deficit_skips_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_fair_enqueue_rejects_total(&self) -> u64 {
+        self.me_fair_enqueue_rejects_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_fair_shed_drops_total(&self) -> u64 {
+        self.me_fair_shed_drops_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_fair_penalties_total(&self) -> u64 {
+        self.me_fair_penalties_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_fair_downstream_stalls_total(&self) -> u64 {
+        self.me_fair_downstream_stalls_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batches_total(&self) -> u64 {
+        self.me_d2c_batches_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batch_frames_total(&self) -> u64 {
+        self.me_d2c_batch_frames_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batch_bytes_total(&self) -> u64 {
+        self.me_d2c_batch_bytes_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_flush_reason_queue_drain_total(&self) -> u64 {
+        self.me_d2c_flush_reason_queue_drain_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_flush_reason_batch_frames_total(&self) -> u64 {
+        self.me_d2c_flush_reason_batch_frames_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_flush_reason_batch_bytes_total(&self) -> u64 {
+        self.me_d2c_flush_reason_batch_bytes_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_flush_reason_max_delay_total(&self) -> u64 {
+        self.me_d2c_flush_reason_max_delay_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_flush_reason_ack_immediate_total(&self) -> u64 {
+        self.me_d2c_flush_reason_ack_immediate_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_flush_reason_close_total(&self) -> u64 {
+        self.me_d2c_flush_reason_close_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_data_frames_total(&self) -> u64 {
+        self.me_d2c_data_frames_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_ack_frames_total(&self) -> u64 {
+        self.me_d2c_ack_frames_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_payload_bytes_total(&self) -> u64 {
+        self.me_d2c_payload_bytes_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_write_mode_coalesced_total(&self) -> u64 {
+        self.me_d2c_write_mode_coalesced_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_write_mode_split_total(&self) -> u64 {
+        self.me_d2c_write_mode_split_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_quota_reject_pre_write_total(&self) -> u64 {
+        self.me_d2c_quota_reject_pre_write_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_quota_reject_post_write_total(&self) -> u64 {
+        self.me_d2c_quota_reject_post_write_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_frame_buf_shrink_total(&self) -> u64 {
+        self.me_d2c_frame_buf_shrink_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_frame_buf_shrink_bytes_total(&self) -> u64 {
+        self.me_d2c_frame_buf_shrink_bytes_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batch_frames_bucket_1(&self) -> u64 {
+        self.me_d2c_batch_frames_bucket_1.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batch_frames_bucket_2_4(&self) -> u64 {
+        self.me_d2c_batch_frames_bucket_2_4.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batch_frames_bucket_5_8(&self) -> u64 {
+        self.me_d2c_batch_frames_bucket_5_8.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batch_frames_bucket_9_16(&self) -> u64 {
+        self.me_d2c_batch_frames_bucket_9_16.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batch_frames_bucket_17_32(&self) -> u64 {
+        self.me_d2c_batch_frames_bucket_17_32
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batch_frames_bucket_gt_32(&self) -> u64 {
+        self.me_d2c_batch_frames_bucket_gt_32
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batch_bytes_bucket_0_1k(&self) -> u64 {
+        self.me_d2c_batch_bytes_bucket_0_1k.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batch_bytes_bucket_1k_4k(&self) -> u64 {
+        self.me_d2c_batch_bytes_bucket_1k_4k.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batch_bytes_bucket_4k_16k(&self) -> u64 {
+        self.me_d2c_batch_bytes_bucket_4k_16k
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batch_bytes_bucket_16k_64k(&self) -> u64 {
+        self.me_d2c_batch_bytes_bucket_16k_64k
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batch_bytes_bucket_64k_128k(&self) -> u64 {
+        self.me_d2c_batch_bytes_bucket_64k_128k
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batch_bytes_bucket_gt_128k(&self) -> u64 {
+        self.me_d2c_batch_bytes_bucket_gt_128k
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_flush_duration_us_bucket_0_50(&self) -> u64 {
+        self.me_d2c_flush_duration_us_bucket_0_50
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_flush_duration_us_bucket_51_200(&self) -> u64 {
+        self.me_d2c_flush_duration_us_bucket_51_200
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_flush_duration_us_bucket_201_1000(&self) -> u64 {
+        self.me_d2c_flush_duration_us_bucket_201_1000
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_flush_duration_us_bucket_1001_5000(&self) -> u64 {
+        self.me_d2c_flush_duration_us_bucket_1001_5000
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_flush_duration_us_bucket_5001_20000(&self) -> u64 {
+        self.me_d2c_flush_duration_us_bucket_5001_20000
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_flush_duration_us_bucket_gt_20000(&self) -> u64 {
+        self.me_d2c_flush_duration_us_bucket_gt_20000
+            .load(Ordering::Relaxed)
+    }
+
+    pub fn get_buffer_pool_pooled_gauge(&self) -> u64 {
+        self.buffer_pool_pooled_gauge.load(Ordering::Relaxed)
+    }
+
+    pub fn get_buffer_pool_allocated_gauge(&self) -> u64 {
+        self.buffer_pool_allocated_gauge.load(Ordering::Relaxed)
+    }
+
+    pub fn get_buffer_pool_in_use_gauge(&self) -> u64 {
+        self.buffer_pool_in_use_gauge.load(Ordering::Relaxed)
+    }
+
+    pub fn get_me_c2me_send_full_total(&self) -> u64 {
+        self.me_c2me_send_full_total.load(Ordering::Relaxed)
+    }
+
+    pub fn get_me_c2me_send_high_water_total(&self) -> u64 {
+        self.me_c2me_send_high_water_total.load(Ordering::Relaxed)
+    }
+
+    pub fn get_me_c2me_send_timeout_total(&self) -> u64 {
+        self.me_c2me_send_timeout_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batch_timeout_armed_total(&self) -> u64 {
+        self.me_d2c_batch_timeout_armed_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_d2c_batch_timeout_fired_total(&self) -> u64 {
+        self.me_d2c_batch_timeout_fired_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_writer_pick_sorted_rr_success_try_total(&self) -> u64 {
+        self.me_writer_pick_sorted_rr_success_try_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_writer_pick_sorted_rr_success_fallback_total(&self) -> u64 {
+        self.me_writer_pick_sorted_rr_success_fallback_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_writer_pick_sorted_rr_full_total(&self) -> u64 {
+        self.me_writer_pick_sorted_rr_full_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_writer_pick_sorted_rr_closed_total(&self) -> u64 {
+        self.me_writer_pick_sorted_rr_closed_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_writer_pick_sorted_rr_no_candidate_total(&self) -> u64 {
+        self.me_writer_pick_sorted_rr_no_candidate_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_writer_pick_p2c_success_try_total(&self) -> u64 {
+        self.me_writer_pick_p2c_success_try_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_writer_pick_p2c_success_fallback_total(&self) -> u64 {
+        self.me_writer_pick_p2c_success_fallback_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_writer_pick_p2c_full_total(&self) -> u64 {
+        self.me_writer_pick_p2c_full_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_writer_pick_p2c_closed_total(&self) -> u64 {
+        self.me_writer_pick_p2c_closed_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_writer_pick_p2c_no_candidate_total(&self) -> u64 {
+        self.me_writer_pick_p2c_no_candidate_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_writer_pick_blocking_fallback_total(&self) -> u64 {
+        self.me_writer_pick_blocking_fallback_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_writer_pick_mode_switch_total(&self) -> u64 {
+        self.me_writer_pick_mode_switch_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_socks_kdf_strict_reject(&self) -> u64 {
+        self.me_socks_kdf_strict_reject.load(Ordering::Relaxed)
+    }
+    pub fn get_me_socks_kdf_compat_fallback(&self) -> u64 {
+        self.me_socks_kdf_compat_fallback.load(Ordering::Relaxed)
+    }
+    pub fn get_secure_padding_invalid(&self) -> u64 {
+        self.secure_padding_invalid.load(Ordering::Relaxed)
+    }
+    pub fn get_desync_total(&self) -> u64 {
+        self.desync_total.load(Ordering::Relaxed)
+    }
+    pub fn get_desync_full_logged(&self) -> u64 {
+        self.desync_full_logged.load(Ordering::Relaxed)
+    }
+    pub fn get_desync_suppressed(&self) -> u64 {
+        self.desync_suppressed.load(Ordering::Relaxed)
+    }
+    pub fn get_desync_frames_bucket_0(&self) -> u64 {
+        self.desync_frames_bucket_0.load(Ordering::Relaxed)
+    }
+    pub fn get_desync_frames_bucket_1_2(&self) -> u64 {
+        self.desync_frames_bucket_1_2.load(Ordering::Relaxed)
+    }
+    pub fn get_desync_frames_bucket_3_10(&self) -> u64 {
+        self.desync_frames_bucket_3_10.load(Ordering::Relaxed)
+    }
+    pub fn get_desync_frames_bucket_gt_10(&self) -> u64 {
+        self.desync_frames_bucket_gt_10.load(Ordering::Relaxed)
+    }
+    pub fn get_pool_swap_total(&self) -> u64 {
+        self.pool_swap_total.load(Ordering::Relaxed)
+    }
+    pub fn get_pool_drain_active(&self) -> u64 {
+        self.pool_drain_active.load(Ordering::Relaxed)
+    }
+    pub fn get_pool_force_close_total(&self) -> u64 {
+        self.pool_force_close_total.load(Ordering::Relaxed)
+    }
+    pub fn get_pool_stale_pick_total(&self) -> u64 {
+        self.pool_stale_pick_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_writer_removed_total(&self) -> u64 {
+        self.me_writer_removed_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_writer_removed_unexpected_total(&self) -> u64 {
+        self.me_writer_removed_unexpected_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_refill_triggered_total(&self) -> u64 {
+        self.me_refill_triggered_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_refill_skipped_inflight_total(&self) -> u64 {
+        self.me_refill_skipped_inflight_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_refill_failed_total(&self) -> u64 {
+        self.me_refill_failed_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_writer_restored_same_endpoint_total(&self) -> u64 {
+        self.me_writer_restored_same_endpoint_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_writer_restored_fallback_total(&self) -> u64 {
+        self.me_writer_restored_fallback_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_me_no_writer_failfast_total(&self) -> u64 {
+        self.me_no_writer_failfast_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_hybrid_timeout_total(&self) -> u64 {
+        self.me_hybrid_timeout_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_async_recovery_trigger_total(&self) -> u64 {
+        self.me_async_recovery_trigger_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_inline_recovery_total(&self) -> u64 {
+        self.me_inline_recovery_total.load(Ordering::Relaxed)
+    }
+    pub fn get_ip_reservation_rollback_tcp_limit_total(&self) -> u64 {
+        self.ip_reservation_rollback_tcp_limit_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_ip_reservation_rollback_quota_limit_total(&self) -> u64 {
+        self.ip_reservation_rollback_quota_limit_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_quota_refund_bytes_total(&self) -> u64 {
+        self.quota_refund_bytes_total.load(Ordering::Relaxed)
+    }
+    pub fn get_quota_contention_total(&self) -> u64 {
+        self.quota_contention_total.load(Ordering::Relaxed)
+    }
+    pub fn get_quota_contention_timeout_total(&self) -> u64 {
+        self.quota_contention_timeout_total.load(Ordering::Relaxed)
+    }
+    pub fn get_quota_acquire_cancelled_total(&self) -> u64 {
+        self.quota_acquire_cancelled_total.load(Ordering::Relaxed)
+    }
+    pub fn get_quota_write_fail_bytes_total(&self) -> u64 {
+        self.quota_write_fail_bytes_total.load(Ordering::Relaxed)
+    }
+    pub fn get_quota_write_fail_events_total(&self) -> u64 {
+        self.quota_write_fail_events_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_child_join_timeout_total(&self) -> u64 {
+        self.me_child_join_timeout_total.load(Ordering::Relaxed)
+    }
+    pub fn get_me_child_abort_total(&self) -> u64 {
+        self.me_child_abort_total.load(Ordering::Relaxed)
+    }
+    pub fn get_flow_wait_middle_rate_limit_total(&self) -> u64 {
+        self.flow_wait_middle_rate_limit_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_flow_wait_middle_rate_limit_cancelled_total(&self) -> u64 {
+        self.flow_wait_middle_rate_limit_cancelled_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_flow_wait_middle_rate_limit_ms_total(&self) -> u64 {
+        self.flow_wait_middle_rate_limit_ms_total
+            .load(Ordering::Relaxed)
+    }
+    pub fn get_session_drop_fallback_total(&self) -> u64 {
+        self.session_drop_fallback_total.load(Ordering::Relaxed)
+    }
+}
@@ -0,0 +1,356 @@
+use std::borrow::Borrow;
+use std::collections::VecDeque;
+use std::collections::hash_map::DefaultHasher;
+use std::hash::{Hash, Hasher};
+use std::num::NonZeroUsize;
+use std::sync::Arc;
+use std::sync::atomic::{AtomicU64, Ordering};
+use std::time::{Duration, Instant};
+
+use lru::LruCache;
+use parking_lot::Mutex;
+use tracing::debug;
+
+const REPLAY_INLINE_KEY_CAP: usize = 48;
+
+#[derive(Clone)]
+enum ReplayKey {
+    Inline {
+        len: u8,
+        bytes: [u8; REPLAY_INLINE_KEY_CAP],
+    },
+    Heap(Arc<[u8]>),
+}
+
+impl ReplayKey {
+    fn from_slice(key: &[u8]) -> Self {
+        if key.len() <= REPLAY_INLINE_KEY_CAP {
+            let mut bytes = [0u8; REPLAY_INLINE_KEY_CAP];
+            bytes[..key.len()].copy_from_slice(key);
+            return Self::Inline {
+                len: key.len() as u8,
+                bytes,
+            };
+        }
+
+        Self::Heap(Arc::from(key))
+    }
+
+    fn as_slice(&self) -> &[u8] {
+        match self {
+            Self::Inline { len, bytes } => &bytes[..*len as usize],
+            Self::Heap(bytes) => bytes.as_ref(),
+        }
+    }
+}
+
+impl Borrow<[u8]> for ReplayKey {
+    fn borrow(&self) -> &[u8] {
+        self.as_slice()
+    }
+}
+
+impl PartialEq for ReplayKey {
+    fn eq(&self, other: &Self) -> bool {
+        self.as_slice() == other.as_slice()
+    }
+}
+
+impl Eq for ReplayKey {}
+
+impl Hash for ReplayKey {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.as_slice().hash(state);
+    }
+}
+
+pub struct ReplayChecker {
+    handshake_shards: Vec<Mutex<ReplayShard>>,
+    tls_shards: Vec<Mutex<ReplayShard>>,
+    shard_mask: usize,
+    window: Duration,
+    tls_window: Duration,
+    checks: AtomicU64,
+    hits: AtomicU64,
+    additions: AtomicU64,
+    cleanups: AtomicU64,
+}
+
+struct ReplayEntry {
+    seq: u64,
+}
+
+struct ReplayShard {
+    cache: LruCache<ReplayKey, ReplayEntry>,
+    queue: VecDeque<(Instant, ReplayKey, u64)>,
+    seq_counter: u64,
+    capacity: usize,
+}
+
+impl ReplayShard {
+    fn new(cap: NonZeroUsize) -> Self {
+        Self {
+            cache: LruCache::new(cap),
+            queue: VecDeque::with_capacity(cap.get()),
+            seq_counter: 0,
+            capacity: cap.get(),
+        }
+    }
+
+    fn next_seq(&mut self) -> u64 {
+        self.seq_counter += 1;
+        self.seq_counter
+    }
+
+    fn cleanup(&mut self, now: Instant, window: Duration) {
+        if window.is_zero() {
+            self.cache.clear();
+            self.queue.clear();
+            return;
+        }
+        let cutoff = now.checked_sub(window).unwrap_or(now);
+
+        while let Some((ts, _, _)) = self.queue.front() {
+            if *ts >= cutoff {
+                break;
+            }
+            self.evict_queue_front();
+        }
+    }
+
+    fn evict_queue_front(&mut self) {
+        let Some((_, key, queue_seq)) = self.queue.pop_front() else {
+            return;
+        };
+
+        if let Some(entry) = self.cache.peek(key.as_slice())
+            && entry.seq == queue_seq
+        {
+            self.cache.pop(key.as_slice());
+        }
+    }
+
+    fn check(&mut self, key: &[u8], now: Instant, window: Duration) -> bool {
+        if window.is_zero() {
+            return false;
+        }
+        self.cleanup(now, window);
+        self.cache.get(key).is_some()
+    }
+
+    fn add_owned(&mut self, key: ReplayKey, now: Instant, window: Duration) {
+        if window.is_zero() {
+            return;
+        }
+        self.cleanup(now, window);
+        if self.cache.peek(key.as_slice()).is_some() {
+            return;
+        }
+        while self.queue.len() >= self.capacity {
+            self.evict_queue_front();
+        }
+
+        let seq = self.next_seq();
+        self.cache.put(key.clone(), ReplayEntry { seq });
+        self.queue.push_back((now, key, seq));
+    }
+
+    fn len(&self) -> usize {
+        self.cache.len()
+    }
+}
+
+impl ReplayChecker {
+    pub fn new(total_capacity: usize, window: Duration) -> Self {
+        const MIN_TLS_REPLAY_WINDOW: Duration = Duration::from_secs(120);
+        let num_shards = 64;
+        let shard_capacity = (total_capacity / num_shards).max(1);
+        let cap = NonZeroUsize::new(shard_capacity).unwrap();
+
+        let mut handshake_shards = Vec::with_capacity(num_shards);
+        let mut tls_shards = Vec::with_capacity(num_shards);
+        for _ in 0..num_shards {
+            handshake_shards.push(Mutex::new(ReplayShard::new(cap)));
+            tls_shards.push(Mutex::new(ReplayShard::new(cap)));
+        }
+
+        Self {
+            handshake_shards,
+            tls_shards,
+            shard_mask: num_shards - 1,
+            window,
+            tls_window: window.max(MIN_TLS_REPLAY_WINDOW),
+            checks: AtomicU64::new(0),
+            hits: AtomicU64::new(0),
+            additions: AtomicU64::new(0),
+            cleanups: AtomicU64::new(0),
+        }
+    }
+
+    fn get_shard_idx(&self, key: &[u8]) -> usize {
+        let mut hasher = DefaultHasher::new();
+        key.hash(&mut hasher);
+        (hasher.finish() as usize) & self.shard_mask
+    }
+
+    fn check_and_add_internal(
+        &self,
+        data: &[u8],
+        shards: &[Mutex<ReplayShard>],
+        window: Duration,
+    ) -> bool {
+        self.checks.fetch_add(1, Ordering::Relaxed);
+        let idx = self.get_shard_idx(data);
+        let owned_key = ReplayKey::from_slice(data);
+        let mut shard = shards[idx].lock();
+        let now = Instant::now();
+        let found = shard.check(data, now, window);
+        if found {
+            self.hits.fetch_add(1, Ordering::Relaxed);
+        } else {
+            shard.add_owned(owned_key, now, window);
+            self.additions.fetch_add(1, Ordering::Relaxed);
+        }
+        found
+    }
+
+    fn check_only_internal(
+        &self,
+        data: &[u8],
+        shards: &[Mutex<ReplayShard>],
+        window: Duration,
+    ) -> bool {
+        self.checks.fetch_add(1, Ordering::Relaxed);
+        let idx = self.get_shard_idx(data);
+        let mut shard = shards[idx].lock();
+        let found = shard.check(data, Instant::now(), window);
+        if found {
+            self.hits.fetch_add(1, Ordering::Relaxed);
+        }
+        found
+    }
+
+    fn add_only(&self, data: &[u8], shards: &[Mutex<ReplayShard>], window: Duration) {
+        self.additions.fetch_add(1, Ordering::Relaxed);
+        let idx = self.get_shard_idx(data);
+        let owned_key = ReplayKey::from_slice(data);
+        let mut shard = shards[idx].lock();
+        shard.add_owned(owned_key, Instant::now(), window);
+    }
+
+    pub fn check_and_add_handshake(&self, data: &[u8]) -> bool {
+        self.check_and_add_internal(data, &self.handshake_shards, self.window)
+    }
+
+    pub fn check_and_add_tls_digest(&self, data: &[u8]) -> bool {
+        self.check_and_add_internal(data, &self.tls_shards, self.tls_window)
+    }
+
+    pub fn check_handshake(&self, data: &[u8]) -> bool {
+        self.check_and_add_handshake(data)
+    }
+
+    pub fn add_handshake(&self, data: &[u8]) {
+        self.add_only(data, &self.handshake_shards, self.window)
+    }
+
+    pub fn check_tls_digest(&self, data: &[u8]) -> bool {
+        self.check_only_internal(data, &self.tls_shards, self.tls_window)
+    }
+
+    pub fn add_tls_digest(&self, data: &[u8]) {
+        self.add_only(data, &self.tls_shards, self.tls_window)
+    }
+
+    pub fn stats(&self) -> ReplayStats {
+        let mut total_entries = 0;
+        let mut total_queue_len = 0;
+        for shard in &self.handshake_shards {
+            let s = shard.lock();
+            total_entries += s.cache.len();
+            total_queue_len += s.queue.len();
+        }
+        for shard in &self.tls_shards {
+            let s = shard.lock();
+            total_entries += s.cache.len();
+            total_queue_len += s.queue.len();
+        }
+
+        ReplayStats {
+            total_entries,
+            total_queue_len,
+            total_checks: self.checks.load(Ordering::Relaxed),
+            total_hits: self.hits.load(Ordering::Relaxed),
+            total_additions: self.additions.load(Ordering::Relaxed),
+            total_cleanups: self.cleanups.load(Ordering::Relaxed),
+            num_shards: self.handshake_shards.len() + self.tls_shards.len(),
+            window_secs: self.window.as_secs(),
+        }
+    }
+
+    pub async fn run_periodic_cleanup(&self) {
+        let interval = if self.window.as_secs() > 60 {
+            Duration::from_secs(30)
+        } else {
+            Duration::from_secs((self.window.as_secs().max(1) / 2).max(1))
+        };
+
+        loop {
+            tokio::time::sleep(interval).await;
+
+            let now = Instant::now();
+            let mut cleaned = 0usize;
+
+            for shard_mutex in &self.handshake_shards {
+                let mut shard = shard_mutex.lock();
+                let before = shard.len();
+                shard.cleanup(now, self.window);
+                let after = shard.len();
+                cleaned += before.saturating_sub(after);
+            }
+            for shard_mutex in &self.tls_shards {
+                let mut shard = shard_mutex.lock();
+                let before = shard.len();
+                shard.cleanup(now, self.tls_window);
+                let after = shard.len();
+                cleaned += before.saturating_sub(after);
+            }
+
+            self.cleanups.fetch_add(1, Ordering::Relaxed);
+
+            if cleaned > 0 {
+                debug!(cleaned = cleaned, "Replay checker: periodic cleanup");
+            }
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct ReplayStats {
+    pub total_entries: usize,
+    pub total_queue_len: usize,
+    pub total_checks: u64,
+    pub total_hits: u64,
+    pub total_additions: u64,
+    pub total_cleanups: u64,
+    pub num_shards: usize,
+    pub window_secs: u64,
+}
+
+impl ReplayStats {
+    pub fn hit_rate(&self) -> f64 {
+        if self.total_checks == 0 {
+            0.0
+        } else {
+            (self.total_hits as f64 / self.total_checks as f64) * 100.0
+        }
+    }
+
+    pub fn ghost_ratio(&self) -> f64 {
+        if self.total_entries == 0 {
+            0.0
+        } else {
+            self.total_queue_len as f64 / self.total_entries as f64
+        }
+    }
+}
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Alexey	504cafb129	Merge pull request #824 from telemt/flow MSS Tuning	2026-06-06 12:25:33 +03:00
Alexey	1096e38854	Docs for MSS Tuning Co-Authored-By: brekotis <93345790+brekotis@users.noreply.github.com>	2026-06-06 12:24:27 +03:00
Alexey	9bbdf796d8	Rustfmt	2026-06-06 12:17:19 +03:00
Alexey	27a5f5a4ec	MSS Tuning with config Co-Authored-By: brekotis <93345790+brekotis@users.noreply.github.com>	2026-06-06 12:11:05 +03:00
Alexey	a8adc9fe54	API hardening + Dual-stack fixes + JA3/JA4 observability + Test Stabilization: merge pull request #822 from telemt/flow API hardening + Dual-stack fixes + JA3/JA4 observability + Test Stabilization	2026-06-05 14:36:00 +03:00
Alexey	44be585ee3	Update Cargo.toml	2026-06-05 14:24:27 +03:00
Alexey	cb89d3f4fe	Merge branch 'flow' of https://github.com/telemt/telemt into flow	2026-06-05 14:21:34 +03:00
Alexey	c4e522a16d	Bump -> 3.4.14 Co-Authored-By: brekotis <93345790+brekotis@users.noreply.github.com>	2026-06-05 14:21:29 +03:00
Alexey	8e5f73a86b	Merge branch 'main' into flow	2026-06-05 13:01:05 +03:00
Alexey	7d543aeb67	Fixes for Adversarial Timing Profile Latency-flake by #761 Co-Authored-By: brekotis <93345790+brekotis@users.noreply.github.com>	2026-06-05 12:59:50 +03:00
Alexey	89a885c25f	Reset Interface Cache in Masking timing test Co-Authored-By: brekotis <93345790+brekotis@users.noreply.github.com>	2026-06-05 12:51:54 +03:00
Alexey	54e40fd073	Fixes for Load mask shape security test Co-Authored-By: brekotis <93345790+brekotis@users.noreply.github.com>	2026-06-05 12:43:30 +03:00
Alexey	1934c1279c	Update README.md	2026-06-05 06:54:53 +03:00
Alexey	0bc99b9f74	Merge pull request #820 from groozchique/main [docs] README updates	2026-06-04 18:45:01 +03:00
Alexey	1d8e8890a4	Update README.md	2026-06-04 18:43:04 +03:00
Alexey	d1680a7a80	Update README.md	2026-06-04 18:42:27 +03:00
Alexey	b027608282	JA3 + JA4 Docs Co-Authored-By: brekotis <93345790+brekotis@users.noreply.github.com>	2026-06-03 15:32:32 +03:00
Nick Parfyonov	2f2c9b336c	[docs] make dashes great again	2026-06-03 15:11:52 +03:00
Nick Parfyonov	b9ebfdcd7b	[docs] update RU README to match EN README	2026-06-03 15:10:17 +03:00
Alexey	34b48325fd	JA3+JA4 Pitfall in API + Beobachten Co-Authored-By: brekotis <93345790+brekotis@users.noreply.github.com>	2026-06-02 08:17:56 +03:00
Alexey	5c573a926b	Update Docs after Dualstack + Disable User adding Co-Authored-By: brekotis <93345790+brekotis@users.noreply.github.com>	2026-06-01 20:03:56 +03:00
Alexey	462215b53c	Dual-stack fixes for Upstreams by #798 Co-Authored-By: brekotis <93345790+brekotis@users.noreply.github.com>	2026-06-01 19:50:26 +03:00
Alexey	2264980926	User Disabler in API by #814 + Consistent Listeners in API by #800	2026-05-31 11:17:18 +03:00
Alexey	3d0d575b94	Normalize rlimit type on 32-bit targets in Conntrack Control #815	2026-05-30 18:13:54 +03:00
Alexey	b720906fbc	Merge pull request #813 from telemt/flow Flow	2026-05-29 16:50:37 +03:00
Alexey	ac244962ed	Merge branch 'main' into flow	2026-05-29 16:07:29 +03:00
Aleksei K	752a2f5012	Bump -> 3.4.13	2026-05-29 14:05:19 +03:00
Aleksei K	a77aedfd7a	Atomically claim pressure eviction budget in MR	2026-05-29 13:17:47 +03:00
Alexey	8575d0ee5d	Merge pull request #809 from Dimasssss/install.sh Add interactive prompt for server port during installation	2026-05-29 10:38:00 +03:00
Alexey	213aba5dc9	Update README.md	2026-05-29 08:54:03 +03:00
Aleksei K	a79aaee166	Merge branch 'flow' of https://github.com/telemt/telemt into flow	2026-05-28 16:11:27 +03:00
Aleksei K	2a0fcd6e35	Align ServerHello cipher and opaque ALPN behavior in TLS-F	2026-05-28 16:11:25 +03:00
Dimasssss	54a53e9ff0	Update install.sh	2026-05-28 12:26:46 +03:00
Alexey	63bcd7b3d0	Merge pull request #780 from temandroid/main fix(docker): mount config as directory to allow atomic API writes	2026-05-27 08:33:43 +03:00
Alexey	b68b10790c	Merge pull request #799 from groozchique/main [docs] more CONFIG_PARAMS.md fixes	2026-05-27 08:30:33 +03:00
Alexey	383d4318fe	Add logging configuration to docker-compose: merge pull request #804 from Iv/main Add logging configuration to docker-compose	2026-05-27 08:30:00 +03:00
Kravchenko Ivan	d293861351	Add logging configuration to docker-compose There was a disk full problem.	2026-05-26 20:43:26 +03:00
Alexey	31da0a1356	Fixes for Disable Colors	2026-05-26 12:20:28 +03:00
Nick Parfyonov	34bc1d943a	[docs] add Hot-Reload column back to [general] Re-adding Hot-Reload column to the [general] which was removed by mistake in my previous changes	2026-05-25 10:19:01 +03:00
Nick Parfyonov	50dee40dd2	[docs] remove duplicated parameters in [censorship]	2026-05-25 10:16:11 +03:00
Alexey	d4adf0ef9a	ME: Bound writer queue waits under backpressure	2026-05-25 00:28:29 +03:00
Alexey	dc8951eae8	Reduce MR + ME Routing hot-path contention	2026-05-22 20:19:09 +03:00
Alexey	77a7f89075	Reuse ME reader scratch buffer across read loop iterations	2026-05-22 19:56:38 +03:00
Alexey	31b9504464	Merge pull request #797 from groozchique/main Remove duplicated config params in [general] + some clarifications in FAQ + fix grammar mistake in RU FAQ	2026-05-22 19:23:40 +03:00
Nick Parfyonov	54cb4d0f29	[docs] some clarification in client-to-DC section in FAQ Made some clarification about MTProxy requiremnt to reach all DCs to work properly for every client	2026-05-22 18:20:37 +03:00
Nick Parfyonov	d449fc080c	[docs] fix grammar mistake in FAQ.ru.md	2026-05-22 18:15:49 +03:00
Nick Parfyonov	3b8d16bee5	[docs] remove duplicated parameters in CONFIG_PARAMS.md	2026-05-22 18:14:10 +03:00
Alexey	9abaf9006c	Prioritize Cancellation in MP select paths	2026-05-22 16:47:54 +03:00
Alexey	231f04a810	Bump	2026-05-22 11:00:41 +03:00
Alexey	b32daf79bc	Update Cargo.lock	2026-05-22 11:00:18 +03:00
Alexey	f668759c05	API Fixes + Exclusive Mask + Startup Speed-up + IDN + Decomposing hot-path modules: merge pull request #796 from telemt/flow API Fixes + Exclusive Mask + Startup Speed-up + IDN + Decomposing hot-path modules	2026-05-22 10:55:26 +03:00
Alexey	4d9e835fa2	Merge branch 'main' into flow	2026-05-21 23:45:54 +03:00
Alexey	885258b85e	Prioritize Relay Flow Cancellation over Buffered Writes	2026-05-21 20:35:25 +03:00
Alexey	98c985091c	Decomposing hot-path modules into focused submodules Signed-off-by: Alexey <247128645+axkurcom@users.noreply.github.com>	2026-05-21 18:03:55 +03:00
Alexey	c02c7fbe43	Reducing hot-path allocs + duplicate telemetry touchs Signed-off-by: Alexey <247128645+axkurcom@users.noreply.github.com>	2026-05-20 17:07:54 +03:00
Alexey	8379b48f69	Fix hot-path replay bounds and ME control allocations Signed-off-by: Alexey <247128645+axkurcom@users.noreply.github.com>	2026-05-20 14:05:22 +03:00
Alexey	70d02910b7	Fixes for SILENT-mode by #792 Signed-off-by: Alexey <247128645+axkurcom@users.noreply.github.com>	2026-05-20 10:54:37 +03:00
Alexey	422d97a385	Update load.rs Signed-off-by: Alexey <247128645+axkurcom@users.noreply.github.com>	2026-05-20 10:33:18 +03:00
Alexey	6b0cc48c2b	IDN Support Signed-off-by: Alexey <247128645+axkurcom@users.noreply.github.com>	2026-05-19 22:42:09 +03:00
Alexey	914f141715	Exclusive Mask + Startup Speed-up Signed-off-by: Alexey <247128645+axkurcom@users.noreply.github.com>	2026-05-19 22:17:59 +03:00
Alexey	b4c33eff39	Update CONTRIBUTING.md	2026-05-19 11:10:00 +03:00
TEMAndroid	855c5eef8b	Merge branch 'main' into main	2026-05-18 10:41:24 +03:00
Alexey	9e877e45c9	Merge pull request #788 from amirotin/feature/users-quota-endpoint Add GET /v1/users/quota endpoint	2026-05-17 11:06:06 +03:00
Alexey	01b0c5c6ce	Merge pull request #786 from Dimasssss/patch-1 Update install.sh	2026-05-16 14:12:14 +03:00
Mirotin Artem	0af64a4d0a	Add GET /v1/users/quota endpoint	2026-05-15 16:25:56 +03:00
Dimasssss	ad1bb5cc1a	Update install.sh	2026-05-15 01:32:37 +03:00
Dimasssss	08cde1a255	Update install.sh	2026-05-15 01:29:13 +03:00
Dimasssss	faf1f28f9d	Update install.sh	2026-05-15 01:23:45 +03:00
Dimasssss	32613c8e68	Update install.sh	2026-05-15 01:12:47 +03:00
Alexey	f77e9b8881	Merge pull request #783 from astronaut808/feature/user-rate-limits-api Expose user rate limits through the API	2026-05-14 18:20:04 +03:00
astronaut808	25ca64de1b	Document Docker config layout for API mutations	2026-05-13 16:42:01 +05:00
astronaut808	8895947414	Expose user rate limits through the API	2026-05-13 16:35:40 +05:00
TEMAndroid	b175927324	fix(docker): mount config as directory to allow atomic API writes	2026-05-11 20:50:31 +00:00
Alexey	1fe621f743	Update CONFIG_PARAMS.en.md	2026-05-10 17:37:41 +03:00
Alexey	3b0ebf3c9e	Update CONFIG_PARAMS.ru.md	2026-05-10 17:37:31 +03:00
Alexey	b41f6bc21e	Update CONFIG_PARAMS.en.md	2026-05-10 17:37:15 +03:00
Alexey	0a9f599611	Update CONFIG_PARAMS.en.md	2026-05-10 17:37:03 +03:00
Alexey	cdb021fc71	Update CONFIG_PARAMS.ru.md	2026-05-10 17:22:39 +03:00
Alexey	6b61183b9d	Update CONFIG_PARAMS.en.md	2026-05-10 17:22:21 +03:00
Alexey	7a284623d6	Update API.md	2026-05-10 15:38:27 +03:00