- Replaced `get_container_db_async_session` with `async_session_maker` for improved session handling in background tasks.
- Refactored chat memory services to utilize a shared `mem0` client for better memory management.
- Introduced new methods for retrieving and storing chat history, integrating with SQL and memory layers.
- Enhanced error handling and response management in chat-related services.
- Cleaned up unused code and improved overall structure for maintainability.
- Introduced a new Alembic migration to add a 'theme' column to the 'presentations' table.
- Updated migration scripts to handle unversioned databases more gracefully.
- Added a script for programmatically deleting local SQLite database files and running migrations.
- Enhanced database initialization logic to conditionally run migrations based on environment settings.
