I edited my original post before hitting submit, and managed to clear out 
the important stuff.  Ha.

On Wednesday, April 6, 2016 at 2:42:38 PM UTC-4, Jeff Dairiki wrote:
> I use a reified request property to create the SqlAlchemy session. 
> The factory function adds an "add_finished_callback" to close the session.

I do that in all my personal/work apps.
Right now, I'm using the stock scaffold with global scoped session for a 
side project that I'm open sourcing.


>   (Why don't you have access to the request?)

I'm trying to keep things simple and do this in app/__init__.py.

the `main` function only has a config object, the request doesn't exist yet.

def main(global_config, **settings):
config = Configurator(settings=settings)
wsgi_app = config.make_wsgi_app()
return wsgi_app

so I need to somehow use a hook that has a request object.  two things that 
came to mind:  tweens and events.

    def db_cleanup__tween_factory(handler, registry):
        def db_cleanup__tween(request):
                response = handler(request)
                return response
        return db_cleanup__tween

    def db_cleanup__event(event):
        event.request.add_finished_callback(lambda request: 

    def main(global_config, **settings):
        config.add_tween('app.db_cleanup__tween_factory', over=EXCVIEW)

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