-- 回滚：恢复 IoT 卡的成本价和分销价字段

ALTER TABLE tb_iot_card ADD COLUMN IF NOT EXISTS cost_price BIGINT DEFAULT 0;
ALTER TABLE tb_iot_card ADD COLUMN IF NOT EXISTS distribute_price BIGINT DEFAULT 0;

COMMENT ON COLUMN tb_iot_card.cost_price IS '成本价(分为单位)';
COMMENT ON COLUMN tb_iot_card.distribute_price IS '分销价(分为单位)';