badge2.txt

flows:

    message new ->
        channel_command append new
        for user in room:
            notify user


    notifier.send user channel_id, message
        cache incr channel_id, user.id
        counts[user.id] += 1
        for device in user.devices:
            device_service.send(message badge=counts[user.id])

    notifier.clear user channel_id
        cache get old and set to 0 channel_id, user.id
        counts[user.id] -= old