twotalesanimation 05f74f1b86 feat: prevent duplicate membership applications and fees ...

- 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

2025-12-05 09:42:42 +02:00

1.2 KiB

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