Update database setup to include simple migrations and enhance .gitignore

- Added the `run_simple_migrations` function call in the database initialization process to ensure any missing columns are added during setup.
- Updated the .gitignore file to exclude the `models_old.py` file, improving project cleanliness.

db/database_setup.py

@@ -4,6 +4,7 @@ from sqlalchemy.orm import sessionmaker
 
 from config.settings import Settings
 from .models import Base
+from .migrator import run_simple_migrations
 
 async_engine = None
 
@@ -62,6 +63,8 @@ async def init_db(settings: Settings, session_factory: sessionmaker):
 
     async with async_engine.begin() as conn:
         await conn.run_sync(Base.metadata.create_all)
+        # Run lightweight, idempotent migrations to add any missing columns
+        await conn.run_sync(run_simple_migrations)
     logging.info(
         "PostgreSQL database initialized/checked successfully using SQLAlchemy."
     )