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86f7946120
- Rename 'metadata' column to 'extra_data' in ClientNotification model to avoid SQLAlchemy Declarative API reserved word conflict - Update ClientNotificationService to use 'extra_data' instead of 'metadata' - Maintain API compatibility by returning 'metadata' key in to_dict() method - Update migration to create 'extra_data' column instead of 'metadata' - Improve migration idempotency and SQLite compatibility with proper checks - Enhance backup directory handling with configurable BACKUP_FOLDER support - Update admin routes to use centralized backup directory function This fixes the application startup error: sqlalchemy.exc.InvalidRequestError: Attribute name 'metadata' is reserved when using the Declarative API. The migration is now idempotent and handles both PostgreSQL and SQLite databases safely.