The Django docs point to the "hooks" you can use for custom code when
saving/deleting objects in the Django admin
http://www.djangoproject.com/documentation/models/save_delete_hooks/

What is not clear is how (or rather, where) to create a copy of an object
before editing, so that it can be compared to the "revised" version altered
by the user and appropriate code be executed.

How and where can this be done?

Thanks
Derek

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