fix: improve maintenance and synchronize live conversations

backend/app/api/roles.py

@@ -20,7 +20,6 @@ from sqlalchemy.exc import IntegrityError
 from app.database import get_db
 from app.models.user import User
 from app.core.auth import (
-    check_permissions,
     require_any_permission,
     require_grantable,
     require_permissions,
@@ -35,7 +34,6 @@ from app.models.schemas.role import (
     PermissionResponse
 )
 from typing import List
-from uuid import UUID
 
 router = APIRouter()