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