I know that for mysql em-mysql exists as an asynchronous interface driver to MySQL and that Active Record, with some modification, can make immediate use of. I believe Sequel has this capability already. I also understand that the pg gem exposes PostgreSQL's native async API.
My question: is there any Ruby ORM that natively interoperates with EventMachine when the backing database is PostgreSQL? If not, what needs to be done to retrofit Sequel to support async PostgreSQL? ActiveRecord?