1. I had a concern a few months ago when doing an audit of code.  I ended 
up not having an issue, but this link might be of help:

    https://groups.google.com/d/topic/sqlalchemy/Z7tMCB_IK1M/discussion

2.  I use `add_finished_callback`, which runs unconditionally at the end of 
every request.  

    request.add_finished_callback(cleanup_db_session)

Actually, I think this may be caused or exacerbated by your use of 
`NewRespsone`.  I think that event can be triggered multiple times during a 
single request, and if you generate multiple response objects, only the 
first one would have an active connection.

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