Don't delete an instance not yet in the session, instead expunge it.#18
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Solution given by sqlqlchemy maintainer on this thread. https://stackoverflow.com/questions/8306506/deleting-an-object-from-an-sqlalchemy-session-before-its-been-persisted
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Solution given by sqlqlchemy maintainer, on this thread:
https://stackoverflow.com/questions/8306506/deleting-an-object-from-an-sqlalchemy-session-before-its-been-persisted