{
    "1": {
        "method": "changeIndex",
        "params": [
            "downloads_files_notify",
            "member_file",
            {
                "type": "unique",
                "name": "member_file",
                "columns": [
                    "notify_member_id",
                    "notify_file_id"
                ],
                "length": [
                    null,
                    null
                ]
            }
        ]
    }
}