-- 为qc_result表添加图片序号和分析日志字段
ALTER TABLE `qc_result`
ADD COLUMN `image_index` INT DEFAULT 0 COMMENT '图片序号（从0开始）' AFTER `exam_id`,
ADD COLUMN `analysis_log` TEXT COMMENT '详细质控分析日志' AFTER `remark`,
ADD INDEX `idx_exam_image` (`exam_id`, `image_index`);