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Middleware related to transactions and database connections.
At this time it is very basic; but will eventually sprout all that
two-phase commit goodness that I don't need.
.. note::
This is experimental, and will change in the future.
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Provides a simple mechanism for starting a transaction based on the
factory; and for either committing or rolling back the transaction
depending on the result. It checks for the response's current
status code either through the latest call to start_response; or
through a HTTPException's code. If it is a 100, 200, or 300; the
transaction is committed; otherwise it is rolled back.
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