fix: improve maintenance and synchronize live conversations

backend/app/api/token.py

@@ -18,13 +18,11 @@ from fastapi import APIRouter, Depends, Header, HTTPException, status, Request
 from sqlalchemy.orm import Session
 from datetime import datetime, timezone
 import logging
-import time
 from typing import Optional, Dict, Any
 
 from app.database import get_db
 from app.models.widget import Widget
 from app.models.customer import Customer
-from app.core.config import settings
 from app.core.security import (
     verify_conversation_token,
     get_existing_valid_token_jti,