public function schema()
{
return ['ml_id' => 'int unsigned NOT NULL AUTO_INCREMENT', 'ml_source_blogid' => 'bigint(20) NOT NULL', 'ml_source_elementid' => 'bigint(20) NOT NULL', 'ml_blogid' => 'bigint(20) NOT NULL', 'ml_elementid' => 'bigint(20) NOT NULL', 'ml_type' => 'varchar(20) NOT NULL'];
}