- Add UNIQUE constraint on membership_application.user_id (one app per user)
- Add UNIQUE constraint on membership_fees.user_id (one fee record per user)
- Add validation checks in process_application.php before inserting
- Improve error messages for duplicate submission attempts
- Add migration script to clean up existing duplicates before constraints
- Update checkMembershipApplication to set session message on redirect
- Add comprehensive documentation of duplicate prevention architecture
Individual payments/EFTs are tracked separately in payments table
- Add manage_events.php form for creating/editing events
- Add process_event.php endpoint for CRUD operations with image uploads
- Add admin_events.php list view with sorting, filtering, and delete functionality
- Add database migration to add created_by, published, created_at, updated_at columns to events table
- Add event images directory structure
- All features follow same patterns as trip management system
