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The setValue()/is_required/select-options half of this issue was already fixed incidentally by #47's new api/ticket_custom_fields.php endpoint. The remaining gap: createDefinition()/updateDefinition() never validated field_type against the six values the schema's enum() actually allows (text/textarea/select/checkbox/date/number), so a malformed type could be stored via the admin API and break whatever UI renders it later. Added an ALLOWED_FIELD_TYPES allowlist check at the top of both methods, returning the same ['success' => false, 'error' => ...] shape they already use for a DB failure — api/custom_fields.php already propagates that shape correctly with no changes needed there. Verified against real MariaDB: an invalid field_type is rejected on both create and update, while a valid one still succeeds. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Lhz7pGMaoTfL5sdYS5XiKv