Solved! There is a
*request.add_finished_callback*
property of the request object, so I extended the DAL object:

class Root(DAL):
    def __init__(self, request, uri):
        DAL.__init__(self, uri, pool_size=0)
        
        request.add_finished_callback(self._close)
    def _close(self, request):
        self._adapter.close()

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