#6501 Prune connections map on game teardown

crates/phase-server/src/main.rs

@@ -1084,7 +1084,7 @@ async fn main() {
                     }
                 }
                 // Notify connected players and clean up persistence
-                let conns = bg_connections.lock().await;
+                let mut conns = bg_connections.lock().await;
                 for game_code in &expired {
                     info!(game = %game_code, reason = "disconnect_expired", "game over");
                     if let Some(players) = conns.get(game_code) {
@@ -1100,6 +1100,10 @@ async fn main() {
                     if let Err(e) = bg_game_db.delete_session(game_code) {
                         error!(game = %game_code, error = %e, "failed to delete persisted session");
                     }
+                    // Prune the connections entry for the finished game so the map
+                    // does not grow unbounded (mirrors the game_spectators cleanup
+                    // below). The immutable `conns.get` borrow above has ended.
+                    conns.remove(game_code);
                 }
                 let mut specs = bg_game_spectators.lock().await;
                 for game_code in &expired {
@@ -1135,6 +1139,15 @@ async fn main() {
                     }
                 }
                 drop(mgr);
+                // Prune the connections entries for the expired lobby games so the
+                // map does not grow unbounded (mirrors the game_spectators cleanup
+                // below). Lock order: state (dropped) -> connections -> spectators.
+                {
+                    let mut conns = bg_connections.lock().await;
+                    for game_code in &expired_lobby {
+                        conns.remove(game_code);
+                    }
+                }
                 let mut specs = bg_game_spectators.lock().await;
                 for game_code in &expired_lobby {
                     specs.remove(game_code);