-- t_order_declaration.SkuImage：库内 SKU 选图后写入签名 URL 易超 VARCHAR(255)
-- 后端已改为存 storage key；列宽对齐仓库 SkuImageUrl，兼容外链

SET @db := DATABASE();

SET @need := (
  SELECT COUNT(*)
    FROM information_schema.COLUMNS
   WHERE TABLE_SCHEMA = @db
     AND TABLE_NAME = 't_order_declaration'
     AND COLUMN_NAME = 'SkuImage'
     AND (
       DATA_TYPE <> 'varchar'
       OR CHARACTER_MAXIMUM_LENGTH IS NULL
       OR CHARACTER_MAXIMUM_LENGTH < 512
     )
);

SET @sql := IF(
  @need > 0,
  'ALTER TABLE `t_order_declaration` MODIFY COLUMN `SkuImage` VARCHAR(512) NULL COMMENT ''图片（存 storage key 或短 URL）''',
  'SELECT ''skip t_order_declaration.SkuImage'' AS msg'
);

PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;