{
    "id": "xxx",
    "update_to": "xxx",

    "type": "update_emotion",
    "old_emotion": "!happy",
    "emotion": "happy",
    "cause": {
        "type": "upgrade",
        "object": "room",
        "upgrade_type": "change",
        "room_details": {
            "ref": "rooms[-1]",
            "size": {
                "multiplier": 4
            }
        }
    },
    "emoticon": ":DDD"
}