fix: improve maintenance and synchronize live conversations

backend/app/models/user.py

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey, func, Table, Text
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey, func, Table
 from sqlalchemy.orm import relationship
 from sqlalchemy.dialects.postgresql import UUID
 import uuid