-- xuchao: 家庭邀请码——家长生成一次性邀请码,其他家长凭码注册加入家庭。幂等。
CREATE TABLE IF NOT EXISTS `family_invite` (
	`id` bigint AUTO_INCREMENT NOT NULL,
	`family_id` bigint NOT NULL,
	`code_hash` varchar(64) NOT NULL,
	`created_by` bigint NOT NULL,
	`created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
	`expires_at` datetime NOT NULL,
	`used_at` datetime,
	CONSTRAINT `family_invite_id` PRIMARY KEY(`id`)
);