Add cancelled_by, cancellation_source (organiser|volunteer|system), and cancelled_at columns to shift_assignments. Cancel flow now records who cancelled and why. Assign flow reactivates existing cancelled/rejected records instead of creating duplicates, preventing UNIQUE constraint violations. Assignable-persons endpoint returns previous_assignment data for contextual UI indicators. Frontend shows cancellation source labels, previous assignment history in assign dialog, and "Opnieuw toewijzen" buttons with volunteer-cancelled confirmation dialogs. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
1.6 KiB
1.6 KiB