fix: improve maintenance and synchronize live conversations

backend/app/api/users.py

@@ -15,7 +15,7 @@ limitations under the License.
 """
 
 from fastapi import APIRouter, Depends, HTTPException, Query, status, Response, Request, Body, File, UploadFile
-from fastapi.responses import JSONResponse, RedirectResponse
+from fastapi.responses import RedirectResponse
 from fastapi.security import HTTPBearer, OAuth2PasswordRequestForm
 from sqlalchemy.orm import Session
 from typing import List, Optional