Composite primary keys / composite foreign keys

[haroldo-ok]

This does not seem to be mentioned in the documentation, and a quick Google search only points to an unanswered Stack Overflow question from 2014.

The question is: does JugglingDB support composite keys, both for PKs and for relations?

I'm making that question because we will have to connect to FB dialect 1 databases from a legacy system; in fact, the new system is meant to run alongside it, so, any major database refactorings are out of question.