I'm going to try to get this working on https://latest.datasette.io/ - it already has a way for people to sign in as root, but none of the databases there are writable.

So I'm going to build a plugin which adds a writable named in-memory database.

And some kind of mechanism for clearing out that database on a regular basis - maybe tables in that database get deleted automatically an hour after they are created?

(Would be neat to display their time-left-until-deleted too)