{
    "1": {
        "method": "addColumn",
        "params": [
            "convert_apps",
            {
                "name": "start_date",
                "type": "INT",
                "length": 10,
                "decimals": null,
                "values": null,
                "allow_null": false,
                "default": "0",
                "comment": "",
                "unsigned": false,
                "zerofill": false,
                "auto_increment": false,
                "binary": false
            }
        ]
    }
}