Is Django deleting my python objects?

I've a post_save handler method which stores values in a dictionary,
like

dictionary[instance.id] = some_value

I was writing a post_delete handler to pop the value from the
dictionary, when I found that the value had been already popped.
I don't delete or pop the value anywhere else in the code. dictionary
is the attribute of a singleton object. It lives as long as the server
instance is up.

How could it be possible?

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