fix accumulation

ts/proxies/smart-proxy/connection-manager.ts

@@ -140,10 +140,10 @@ export class ConnectionManager extends LifecycleComponent {
    * Start the inactivity check timer
    */
   private startInactivityCheckTimer(): void {
-    // Check every 30 seconds for connections that need inactivity check
+    // Check more frequently (every 10 seconds) to catch zombies and stuck connections faster
     this.setInterval(() => {
       this.performOptimizedInactivityCheck();
-    }, 30000);
+    }, 10000);
     // Note: LifecycleComponent's setInterval already calls unref()
   }
 
@@ -194,6 +194,13 @@ export class ConnectionManager extends LifecycleComponent {
    * Queue a connection for cleanup
    */
   private queueCleanup(connectionId: string): void {
+    // Check if connection is already being processed
+    const record = this.connectionRecords.get(connectionId);
+    if (!record || record.connectionClosed) {
+      // Already cleaned up or doesn't exist, skip
+      return;
+    }
+    
     this.cleanupQueue.add(connectionId);
     
     // Process immediately if queue is getting large
@@ -217,9 +224,10 @@ export class ConnectionManager extends LifecycleComponent {
     }
     
     const toCleanup = Array.from(this.cleanupQueue).slice(0, this.cleanupBatchSize);
-    this.cleanupQueue.clear();
     
+    // Remove only the items we're processing, not the entire queue!
     for (const connectionId of toCleanup) {
+      this.cleanupQueue.delete(connectionId);
       const record = this.connectionRecords.get(connectionId);
       if (record) {
         this.cleanupConnection(record, record.incomingTerminationReason || 'normal');