{
    "1": {
        "method": "changeColumn",
        "params": [
            "ccs_blocks",
            "block_cache_ttl",
            {
                "name": "block_cache_ttl",
                "type": "varchar",
                "length": 10,
                "allow_null": false,
                "default": 0
            }
        ]
    }
}