fix: improve maintenance and synchronize live conversations

backend/app/core/auth_utils.py

@@ -20,7 +20,7 @@ import http.cookies
 from urllib.parse import parse_qs, urlparse
 from app.core.security import verify_conversation_token
 from app.core.logger import get_logger
-from app.database import get_db, SessionLocal
+from app.database import SessionLocal
 from app.models.user import User
 from sqlalchemy.orm import Session
 from app.core.cors import is_first_party_origin, origin_of