{
    "1": {
        "method": "delete",
        "params": [
            "core_sys_conf_settings",
            [
                "conf_key='guest_captcha'"
            ]
        ]
    },
    "2": {
        "method": "changeColumn",
        "params": [
            "core_validating",
            "prev_email",
            {
                "name": "new_email",
                "type": "VARCHAR",
                "length": 150,
                "decimals": null,
                "values": [],
                "allow_null": false,
                "default": "0",
                "comment": "",
                "unsigned": false,
                "auto_increment": false
            }
        ]
    }
}