{
   "1":  {
        "method": "addIndex",
        "params": [
            "forums_topics",
            {
                "type": "key",
                "name": "most_recent_post",
                "columns": [
                    "forum_id",
                    "approved",
                    "last_post"
                ],
                "length": [
                    null,
                    null,
                    null
                ]
            }
        ]
    }
}