CREATE TABLE `users` (
	`id` int,
	`email` varchar(255),
	`password` varchar(255)
);
CREATE TABLE `admins` (
	`id` int,
	`email` varchar(255),
	`password` varchar(255)
);
CREATE TABLE `cards` (
	`id` int,
	`card_number` varchar(255),
	FOREIGN KEY(`card_number`) REFERENCES `card` (`number`)
);
CREATE TABLE `statuses` (
	`id` int,
	`user_id` int,
	`card_id` int,
	`online_count` int,
	`online_at` datetime,
	`offline_at` datetime,
	`status` bool,
	`value` int,
	FOREIGN KEY(`user_id`) REFERENCES `users` (`id`),
	FOREIGN KEY(`card_id`) REFERENCES `cards` (`id`)
);