You know the Django caching infrastructure better than me, but if that does what it sounds like it does, then looks good!

It might be better to use `BUILD` instead of `VERSION`. It looks like this might have been branched off of an old release-0.10, as it doesn't have a `BUILD` key in it, whereas the main repo does: https://github.com/learningequality/ka-lite/blob/release-0.10/kalite/version.py