v0.9.5 - Complete backend unit test suite 320 tests passing in ~1.3s across 11 test files: - Utils: time_format_utils, absence_utils, email_utils (69 tests) - Services: permission, template, attachment, absence, absence_notification, pdf, email, webuntis (251 tests) Test infrastructure: - pytest 7.4.4 + pytest-asyncio - Black formatter (line-length=88) - GitLab CI integration - UNITTESTS.md as living documentation Phase 1 (Services & Utils): Complete ✅