Currently, the version.previous attribute is calling VersionObjectFetcher.previous
Which runs: self.previous_query(obj).first()

Because it is using .first() - a query is running every time.

It would be a nice developer experience to cache this so it does not call multiple queries.

Currently I need to do:

current = ...
previous = current.previous

And then pass it all around in my functions to avoid performance issues.
It would make my code a lot simpler if the previous property cached the value so I did not need to save it in my own separate variable