Well, http://pgre.st/ was posted 167 days ago here — https://news.ycombinator.com/item?id=6818284 — that's how we do everything in PostgreSQL without having to turn to another language :-)

It's like Kanso/CouchApp for CouchDB, and has support for the functional/object-oriented/new-fangled LiveScript language on top of the v8 engine.

Still working on the homoiconicity part, though!