{
    "1": {
        "method": "dropColumn",
        "params": [
            "core_message_topics",
            "mt_is_draft"
        ]
    },
    "2": {
        "method": "dropColumn",
        "params": [
            "core_message_topics",
            "mt_hasattach"
        ]
    },
    "3": {
        "method": "delete",
        "params": [
            "core_theme_templates",
            [
                "template_set_id > 0"
            ]
        ]
    }
}