- Implemented TableBaseMixin providing generic CRUD methods and automatic timestamp management.
- Introduced UUIDTableBaseMixin for models using UUID as primary keys.
- Added ListResponse for standardized paginated responses.
- Created TimeFilterRequest and PaginationRequest for filtering and pagination parameters.
- Enhanced get_with_count method to return both item list and total count.
- Included validation for time filter parameters in TimeFilterRequest.
- Improved documentation and usage examples throughout the code.
- Removed the `available_nodes` field from the GroupOptions model in `group.py`.
- Updated imports in `pwd.py` by removing unused imports.
- Added a comprehensive roadmap document outlining the development stages and features for DiskNext Server.
- Created a detailed README for the models directory, documenting the database models and their relationships.
