Bring the database back.

It'd be really useful for Pancakes to be able to save searches for a few
reasons:

1) Queuing.
2) Along with queuing comes recovery.
3) If someone wants to redo a search they did earlier, persistent
   searches are a must.  (I've been told that this would be a very
   attractive capability.)

A database is the de-facto way of getting this done, and it's fine for
us.