-- Add cleaned_at and cleaned_by_user_id fields to reports table
ALTER TABLE `reports` 
ADD COLUMN `cleaned_at` TIMESTAMP NULL,
ADD COLUMN `cleaned_by_user_id` VARCHAR(36) NULL,
ADD INDEX `idx_cleaned_at` (`cleaned_at`),
ADD CONSTRAINT `reports_cleaned_by_fk` 
  FOREIGN KEY (`cleaned_by_user_id`) 
  REFERENCES `users`(`id`) 
  ON DELETE SET NULL 
  ON UPDATE NO ACTION;