And there's only half a meg of data! Serving the readers is a much more interesting problem than managing the writes, and tbh I'd just keep a rolling "pixels th

And there's only half a meg of data! Serving the readers is a much more interesting problem than managing the writes, and tbh I'd just keep a rolling "pixels that have changed in the last 10 seconds" diff going, pushed out every 100ms, compressed and cached, and have clients poll for it. Easy peasy, websockets just complicate life.