- Updated `get_source_for_field_update_with_value` to determine source values based on new field values, including handling for empty and unknown values.
- Introduced `get_overwrite_sql_clause` to build SQL conditions for authoritative overwrite checks based on plugin settings.
- Enhanced `update_devices_data_from_scan` to utilize new authoritative settings and conditions for updating device fields.
- Added new tests for source value determination and device creation to ensure proper handling of source fields.
- Created in-memory SQLite database fixtures for testing device creation and updates.
