Backend: match existing CustomField by name as fallback when ID is not provided,
preventing deletion and recreation of field definitions (which cascade-deletes values).
Includes restoration/migration scripts for prod:
- restore-custom-field-values.php: restores piece values from audit logs
- migrate-orphaned-custom-fields.php: migrates values from orphaned CFs
- fix-prod-all.php: combined fix (migrate + restore + cleanup)
- fix-prod-recreate-and-migrate.php: full fix (recreate missing CFs + migrate + restore)
- check-prod-*.php: diagnostic scripts
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
