I would like to delete data that is older than two hours. Currently, on the client-side, I loop through all the data and run a delete on the outdated data. When I do this, the `db.on('value')` function is invoked every time something is deleted. Also, things will only be deleted when a client connects, and what might happen if two clients connect at once?

Where can I set up something that deletes old data? I have a timestamp inside each object created by a JavaScript `Date.now()`.