Interaction with databases using Java API in Crucible

Hi Support Team!

I am developing a plugin for Crucible and I would like to interact with DB using Java API: create new tables and have low level access. For example, it is possible to use ActiveObjects and OfBIzDelegator in JIRA. But I could not find in Documentation that it is possible to use it with Crucible.

Could you please tell me is there any frameworks for useful interaction with DB in Crucible? Or how can I get low level access to the DB using Java API?