ALTER TABLE `image_info` 
ADD COLUMN `thumbnail_instance_id` varchar(32) DEFAULT NULL COMMENT '视频缩略图ID',
ADD COLUMN `duration` bigint DEFAULT NULL COMMENT '视频时长(秒)';ALTER TABLE `story_item`
ADD COLUMN `video_url` VARCHAR(64) COMMENT '视频文件 Instance ID',
ADD COLUMN `duration` BIGINT COMMENT '视频时长(秒)',
ADD COLUMN `thumbnail_url` VARCHAR(64) COMMENT '视频封面 Instance ID';ALTALTER TABLE story_item ADD COLUMN share_id VARCHAR(64) DEFAULT NULL COMMENT '分享ID';ER TABLE `image_info` 
ADD COLUMN `thumbnail_instance_id` varchar(32) DEFAULT NULL COMMENT '视频缩略图ID',
ADD COLUMN `duration` bigint DEFAULT NULL COMMENT '视频时长(秒)';