title: Default order_by clause in SQLAlchemy?
body: <p>How do I set a default order_by clause in a class definition in SQLAlchemy, so that any query against this class will automatically have this clause?</p>
  
  <p>The ORM docs for order_by talk about mapper.order_by but says that this is deprecated, and also mentions overriding existing order_by settings but without saying how these settings might get there.</p>