public function add($user_id, $email_address, $password) {
	$mysql = bootstrap::get_library('mysql');
	
	$sql   = "INSERT INTO `login_passwords` SET `user_id` = %d, `email_address` = '%s';";
	$binds = [$user_id, $email_address];
	$mysql::query($sql, $binds);
	
	$login = new static($mysql::$insert_id);
	
	$hash = self::hash_password($password);
	$login->set_new_hash($hash);
}