Hi folks!

The propose is add post and pre signals for commit and rollback actions (as
sqlalchemy orm events). This allows attach some code when a transaction is
committed or rolled back.

I have some problem, such as send email only when a transaction is
committed successfully, and it's can be done with simple monkey patching
the db backend. But it not appear to be an isolated problem, and would be
awesome if these signals are included in core.

If a purpose is accepted, I can take care of making the issue +
pull-request.

Greetings.
Jesus.

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