The BaseTen Assistant is now done. It is used for importing Core Data data models (.xcdatamodel files) into the PostgreSQL database, and for enabling PostgreSQL databases and tables to be used with BaseTen. Still some other loose ends to tie up before Friday’s release of Developer Preview 1, but we’re getting there!

Will BaseTen support pre-existing database schemas?
Yes, absolutely. You just have to check the "Enabled" button in the assistant for all the tables you want to work with.
Not quite what I meant I think. I mean does it support pre-existing PostgreSQL databases? Ones that were designed before CoreData was around?
Yes, it does. You just have to point the Assistant to the existing database, check the boxes, and you're done.
Well, that's cool. Can't wait to see it.