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Lukas a273b96563 feat: Complete repository protocol coverage

- Add missing protocol methods to Fail2BanDbRepository:
  - get_ban_event_counts: Aggregate ban events per IP (used in ban_service)

- Add missing protocol methods to GeoCacheRepository:
  - delete_stale_entries: Remove old geo cache entries (used in geo_cache_cleanup)

- Add missing protocol methods to HistoryArchiveRepository:
  - purge_archived_history: Remove archived entries older than age threshold

- Add comprehensive protocol compliance tests:
  - Created test_protocol_compliance.py with 8 test classes
  - Validates all 7 repository modules fully implement their protocols
  - Prevents silent protocol drift when methods change signatures
  - Tests verify no unexpected public methods in repository modules

- Update documentation:
  - Add Repository Protocol Coverage Checklist to Backend-Development.md
  - Document procedure for adding new repositories with protocol definitions
  - List current protocol coverage (all 7 repositories, 40 total methods)

- All repositories now have 100% protocol coverage:
  - SessionRepository: 4 methods
  - SettingsRepository: 4 methods
  - BlocklistRepository: 6 methods
  - ImportLogRepository: 4 methods
  - GeoCacheRepository: 13 methods
  - HistoryArchiveRepository: 5 methods
  - Fail2BanDbRepository: 8 methods

This ensures:
- Enhanced mockability for testing
- Static contract verification
- Prevention of protocol drift
- Better IDE support and type checking

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

2026-04-28 07:58:57 +02:00