mitsuhiko/flask-sqlalchemy — pull request #61 by nathan-rice (2011-11-15 20:51:32+00:00)
Title: Allow specification of external metadata object to be used by the SQLAlchemy object. (issue #60)

I use my model definitions outside my web application, so being able to decouple them is nice. Also, I dislike circular references; I would prefer everything go model definition module -> web application module.