ALTER TABLE mall_goods ADD COLUMN status INT DEFAULT 0 COMMENT '商品的状态：0-待审核 1-审核通过，2：审核拒绝' after `add_time`;
ALTER TABLE mall_goods ADD COLUMN applicant_id BIGINT COMMENT '申请人ID' after `status`;

ALTER TABLE mall_goods_specification ADD COLUMN commission_type TINYINT DEFAULT 0 COMMENT '抽成方式：0-无抽成，1-比例抽成，2-金额抽成' AFTER `update_time`;
ALTER TABLE mall_goods_specification ADD COLUMN commission_rate DECIMAL(5,2) COMMENT '比例抽成：抽成百分比，如 5.00 表示 5%' AFTER `commission_type`;
ALTER TABLE mall_goods_specification ADD COLUMN commission_amount DECIMAL(10,2) COMMENT '金额抽成：固定抽成金额' AFTER `commission_rate`;