Update app/services/websocket.py

app/services/websocket.py

@@ -58,7 +58,7 @@ async def create_and_broadcast_notification(
         
         # Convert to dict for broadcasting
         notification_dict = {
-            "id": notification.id,
+            "id": str(notification.id),
             "user_id": notification.user_id,
             "title": notification.title,
             "message": notification.message,