- AttendanceSession model with open/closed status, org_id, timestamps
- POST /api/v1/attendance/check-in/ – creates session, rejects duplicate open check-ins (409)
- POST /api/v1/attendance/check-out/ – closes open session, validates checkout > checkin
- GET /api/v1/attendance/status/ – current open session for requesting user
- GET /api/v1/attendance/history/ – paginated session history per user
- GET /api/v1/attendance/admin/sessions/ – admin view for managers/admins with filters
- Initial migration with composite indexes on (user, status) and (user, checked_in_at)
- 18 test cases covering core flows and edge cases
Co-Authored-By: Paperclip <noreply@paperclip.ing>
