i'd like to detach an object from a session, modify it, and reattach it to the session, with detection of the object's current state (modified), and added to the session's dirty set. i thought calling session.save_or_update, would do this but it resets the modification status of the object (_update_impl -> register_persistent -> register_clean ). such that changes aren't written on session.flush. is there a way to attach a modified object back to a session, such that its registered as dirty?
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