{
    "1": {
        "method": "changeIndex",
        "params": [
            "forums_posts",
            "topic_id",
            {
                "type": "key",
                "name": "topic_id",
                "columns": [
                    "topic_id",
                    "queued",
                    "post_date",
                    "author_id"
                ],
                "length": [
                    null,
                    null,
                    null,
                    null
                ]
            }
        ]
    }
}