Apologies if this has come up before, I didn't find anything related
in the archives.

As Model.save() is called both for inserts and updates, it would
sometimes be useful for pre_save listeners to know whether the
instance exists or not. This information is sent with post_save but by
then it may be too late (e.g. under some conditions you may want to
prevent an insertion from happening). In the current save_base()
implementation, pre_save is sent before the instance's existence is
determined, so I'm not sure if postponing it would break existing
code. If there is no backwards compatibility issue, I can open a
ticket and send a patch for it.

George

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