fix: improve maintenance and synchronize live conversations

backend/app/models/widget.py

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-from sqlalchemy import Column, String, ForeignKey, Integer
+from sqlalchemy import Column, String, ForeignKey
 from sqlalchemy.orm import relationship
 from uuid import  uuid4
 from sqlalchemy.dialects.postgresql import UUID