Update app.py

app.py

@@ -11,7 +11,8 @@ from utils import log
 from chat_handler import router as chat_router  # ← start_session & chat
 from admin_routes import router as admin_router, start_cleanup_task
 from spark_startup import run_in_thread
-from session import session_store  # ← Import session_store
+from session import session_store, start_session_cleanup
+
 from config_provider import ConfigProvider
 
 # ===================== Environment Setup =====================