Remove unused imports across multiple modules

Cleaned up various files by removing unused or redundant import statements to improve code readability and reduce potential confusion. No functional changes were made.

src/common/database/db_migration.py

@@ -1,7 +1,6 @@
 # mmc/src/common/database/db_migration.py
 
 from sqlalchemy import inspect, text
-from sqlalchemy.engine import Engine
 from src.common.database.sqlalchemy_models import Base, get_engine
 from src.common.logger import get_logger
 

src/common/database/sqlalchemy_database_api.py

@@ -7,9 +7,7 @@
 import traceback
 import time
 from typing import Dict, List, Any, Union, Type, Optional
-from contextlib import contextmanager
-from sqlalchemy.orm import Session
-from sqlalchemy.exc import SQLAlchemyError, DisconnectionError, OperationalError
+from sqlalchemy.exc import SQLAlchemyError
 from sqlalchemy import desc, asc, func, and_
 from src.common.logger import get_logger
 from src.common.database.sqlalchemy_models import (

src/common/database/sqlalchemy_models.py

@@ -11,7 +11,6 @@ import os
 import datetime
 import time
 from src.common.logger import get_logger
-import threading
 from contextlib import contextmanager
 
 logger = get_logger("sqlalchemy_models")