CREATE TABLE `user` (
	`username` varchar(255) PRIMARY KEY
);
CREATE TABLE `oauth_connection` (
	`username` varchar(255),
	`rank` int,
	`provider_id` int,
	`provider_user_id` varchar(255),
	`display_name` varchar(255),
	`access_token` varchar(255),
	`expires_at` datetime,
	FOREIGN KEY(`username`) REFERENCES `user` (`username`),
	FOREIGN KEY(`provider_id`) REFERENCES `oauth_provider` (`id`)
);
CREATE TABLE `oauth_provider` (
	`id` int PRIMARY KEY,
	`name` varchar(255)
);