-- 월간 확인 워크플로우 확장: pending → review_sent → confirmed/change_request/rejected
ALTER TABLE monthly_work_confirmations
  MODIFY status ENUM('pending','review_sent','confirmed','change_request','rejected') DEFAULT 'pending';
ALTER TABLE monthly_work_confirmations ADD COLUMN IF NOT EXISTS reviewed_by INT NULL;
ALTER TABLE monthly_work_confirmations ADD COLUMN IF NOT EXISTS reviewed_at TIMESTAMP NULL;
ALTER TABLE monthly_work_confirmations ADD COLUMN IF NOT EXISTS change_details TEXT NULL;
ALTER TABLE monthly_work_confirmations ADD COLUMN IF NOT EXISTS admin_checked TINYINT(1) DEFAULT 0;
