Bulk Class Session Cancellation by Instructor

[corypride]

Implement bulk cancellation of class event sessions for specific instructors within a date range. This feature enables administrators to efficiently cancel multiple class sessions when an instructor is on PTO, sick leave, or otherwise unavailable, with full audit trail visibility in Class History.

Changes

Backend

• API Endpoint: POST /api/program-classes/bulk-cancel - Handles bulk session cancellations
• Database Functions: BulkCancelSessions() - Processes recurring events and creates override records
• Migration: Added instructor_id foreign key to program_classes table with proper indexing
• Instructor Management: /api/facilities/{id}/instructors endpoint returning facility admins only

Frontend

• Modal Component: BulkCancelSessionsModal.tsx - Full cancellation workflow with preview
• Form Updates: ClassManagementForm.tsx - Replaced text input with instructor dropdown
• History Integration: Cancellations appear in ActivityHistoryCard with full audit details

Key Features

• Instructor dropdown populated with facility administrators only
• Date range selection with past date warnings
• Required cancellation reason (min 10 characters)
• Real-time preview showing affected sessions, and classes
• Creates ProgramClassEventOverride records for each cancelled session
• Full audit trail via ChangeLogEntry records

Files Changed

• backend/src/database/program_classes.go - Bulk cancellation logic
• backend/src/handlers/classes_handler.go - API endpoints
• backend/src/handlers/facilities_handler.go - Instructor queries
• backend/src/models/program_classes.go - Data models
• backend/migrations/00061_add_instructor_fk.sql - Database schema
• frontend/src/Components/modals/BulkCancelSessionsModal.tsx - Modal UI
• frontend/src/Components/forms/ClassManagementForm.tsx - Form updates
• frontend/src/Components/ClassLayout.tsx - Integration point

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Related Asana Task:

• https://app.asana.com/0/0/1212244822085218