Oh wow, apologies for the misstatement. I glanced at the docs, features, and github, and didn't see any sign or mention of a DB dependency, so I assumed they had written their own.
Sorry to the baasbox db team for the incorrect assumption. But it might be a good idea to make the underlying db a bit clearer, assuming I didn't miss any obvious mention of it (which is quite possible).
orientdb is a fine db, indeed it's one I was thinking of when I was wondering (incorrectly) why they wrote their own.
Thanks for your correction.