You can write (and push the WSGI stack) a useful piece of WSGI middleware that uses threading.Timer , which logs the fact that the transaction has exceeded 30 seconds (and, of course, calls cancel on the exit timer object, since this do not write anything).
I would do it at the WSGI level and not at the Django level, (a) because I am more familiar with the WSGI middleware and (b) because it is a more general solution (it can help the Django web application, but it can also help the web application using any other infrastructure - the use of WSGI is guaranteed by App Engine, no matter what structure you plan to assign to it).
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