CREATE TABLE IF NOT EXISTS user_mfa (
 user_serial BIGINT UNSIGNED NOT NULL PRIMARY KEY,
 secret_cipher TEXT NOT NULL,
 last_counter BIGINT NOT NULL DEFAULT -1,
 FOREIGN KEY (user_serial) REFERENCES users(user_serial) ON DELETE CASCADE
) ENGINE=InnoDB;
CREATE TABLE IF NOT EXISTS mfa_recovery (
 user_serial BIGINT UNSIGNED NOT NULL,
 code_hash CHAR(64) CHARACTER SET ascii COLLATE ascii_bin NOT NULL,
 PRIMARY KEY(user_serial,code_hash),
 FOREIGN KEY (user_serial) REFERENCES users(user_serial) ON DELETE CASCADE
) ENGINE=InnoDB;
CREATE TABLE IF NOT EXISTS club_resource_usage (
 club_serial BIGINT UNSIGNED NOT NULL,
 resource_name VARCHAR(32) NOT NULL,
 window_started DATETIME NOT NULL,
 used_count INT UNSIGNED NOT NULL,
 PRIMARY KEY(club_serial,resource_name),
 FOREIGN KEY (club_serial) REFERENCES clubs(club_serial) ON DELETE RESTRICT
) ENGINE=InnoDB;