Integration hardening: reconcile main+flow-sec API drift and restore green suite

src/proxy/client.rs

@@ -84,7 +84,6 @@ use crate::proxy::handshake::{HandshakeSuccess, handle_mtproto_handshake, handle
 use crate::proxy::masking::handle_bad_client;
 use crate::proxy::middle_relay::handle_via_middle_proxy;
 use crate::proxy::route_mode::{RelayRouteMode, RouteRuntimeController};
-use crate::proxy::session_eviction::register_session;
 
 fn beobachten_ttl(config: &ProxyConfig) -> Duration {
     let minutes = config.general.beobachten_minutes;
@@ -867,17 +866,6 @@ impl RunningClientHandler {
                 }
             };
 
-        let registration = register_session(&user, success.dc_idx);
-        if registration.replaced_existing {
-            stats.increment_reconnect_evict_total();
-            warn!(
-                user = %user,
-                dc = success.dc_idx,
-                "Reconnect detected: replacing active session for user+dc"
-            );
-        }
-        let session_lease = registration.lease;
-
         let route_snapshot = route_runtime.snapshot();
         let session_id = rng.u64();
         let relay_result = if config.general.use_middle_proxy
@@ -897,7 +885,6 @@ impl RunningClientHandler {
                     route_runtime.subscribe(),
                     route_snapshot,
                     session_id,
-                    session_lease.clone(),
                 )
                 .await
             } else {
@@ -914,7 +901,6 @@ impl RunningClientHandler {
                     route_runtime.subscribe(),
                     route_snapshot,
                     session_id,
-                    session_lease.clone(),
                 )
                 .await
             }
@@ -932,7 +918,6 @@ impl RunningClientHandler {
                 route_runtime.subscribe(),
                 route_snapshot,
                 session_id,
-                session_lease.clone(),
             )
             .await
         };

src/proxy/direct_relay.rs

@@ -22,8 +22,6 @@ use crate::proxy::route_mode::{
     RelayRouteMode, RouteCutoverState, ROUTE_SWITCH_ERROR_MSG, affected_cutover_state,
     cutover_stagger_delay,
 };
-use crate::proxy::adaptive_buffers;
-use crate::proxy::session_eviction::SessionLease;
 use crate::stats::Stats;
 use crate::stream::{BufferPool, CryptoReader, CryptoWriter};
 use crate::transport::UpstreamManager;
@@ -185,7 +183,6 @@ pub(crate) async fn handle_via_direct<R, W>(
     mut route_rx: watch::Receiver<RouteCutoverState>,
     route_snapshot: RouteCutoverState,
     session_id: u64,
-    session_lease: SessionLease,
 ) -> Result<()>
 where
     R: AsyncRead + Unpin + Send + 'static,
@@ -225,27 +222,17 @@ where
     stats.increment_user_connects(user);
     let _direct_connection_lease = stats.acquire_direct_connection_lease();
 
-    let seed_tier = adaptive_buffers::seed_tier_for_user(user);
-    let (c2s_copy_buf, s2c_copy_buf) = adaptive_buffers::direct_copy_buffers_for_tier(
-        seed_tier,
-        config.general.direct_relay_copy_buf_c2s_bytes,
-        config.general.direct_relay_copy_buf_s2c_bytes,
-    );
-
     let relay_result = relay_bidirectional(
         client_reader,
         client_writer,
         tg_reader,
         tg_writer,
-        c2s_copy_buf,
-        s2c_copy_buf,
+        config.general.direct_relay_copy_buf_c2s_bytes,
+        config.general.direct_relay_copy_buf_s2c_bytes,
         user,
-        success.dc_idx,
         Arc::clone(&stats),
         config.access.user_data_quota.get(user).copied(),
         buffer_pool,
-        session_lease,
-        seed_tier,
     );
     tokio::pin!(relay_result);
     let relay_result = loop {