-- job_postings：是否已投递成功、未投递/投递失败原因（直接存表，不连表查询）
-- 若字段已存在可忽略报错

ALTER TABLE job_postings
ADD COLUMN is_delivered TINYINT(1) NOT NULL DEFAULT 0 COMMENT '是否已投递成功：1是 0否' AFTER applyTime;

ALTER TABLE job_postings
ADD COLUMN deliver_failed_reason TEXT NULL COMMENT '未投递或投递失败原因' AFTER is_delivered;