CREATE TABLE IF NOT EXISTS `video_upload_audits` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `uuid` CHAR(36) NOT NULL UNIQUE,
  `teacher_id` BIGINT UNSIGNED NOT NULL,
  `course_id` BIGINT UNSIGNED NULL,
  `lesson_id` BIGINT UNSIGNED NULL,
  `file_sha256` CHAR(64) NOT NULL,
  `original_filename` VARCHAR(500) NOT NULL,
  `decision` ENUM('approved', 'needs_manual_review', 'rejected') NOT NULL,
  `report_json` JSON NOT NULL,
  `created_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_video_upload_audits_teacher` (`teacher_id`),
  KEY `idx_video_upload_audits_decision` (`decision`),
  CONSTRAINT `fk_video_upload_audits_teacher` FOREIGN KEY (`teacher_id`) REFERENCES `teachers` (`id`) ON DELETE CASCADE,
  CONSTRAINT `fk_video_upload_audits_course` FOREIGN KEY (`course_id`) REFERENCES `courses` (`id`) ON DELETE SET NULL,
  CONSTRAINT `fk_video_upload_audits_lesson` FOREIGN KEY (`lesson_id`) REFERENCES `lessons` (`id`) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;