Update app.py

app.py

@@ -8,7 +8,7 @@ import mimetypes
 
 from utils import log
 from chat_handler import router as chat_router  # ← start_session & chat
-from admin_routes import router as admin_router  # ← Admin API endpoints
+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 config_provider import ConfigProvider
@@ -45,6 +45,7 @@ app = FastAPI(
 )
 
 run_in_thread()
+start_cleanup_task()  # Activity log cleanup
 
 # ---------------- Core chat/session routes --------------------------
 app.include_router(chat_router)