Fix database migration import path error

- Add project root to Python path in migrations/env.py
- Ensure all models are properly imported in base_models.py
- Fix import statements for proper module resolution

migrations/env.py

@@ -1,8 +1,14 @@
+import sys
 from logging.config import fileConfig
+from pathlib import Path
 
 from alembic import context
 from sqlalchemy import engine_from_config, pool
 
+# Add the project root directory to the Python path
+# This ensures that the 'app' module can be imported correctly
+sys.path.insert(0, str(Path(__file__).parent.parent))
+
 # Import all models for Alembic to detect
 # Import Base from our app for auto-generating migrations
 from app.db.base import Base