We recently decided to upgrade our internal system to turn something that was not temporal (our billing rates) into something that was.
Normally that would be a pretty big change. As it turned out, it was pretty straightforward and could be done, as an inplace update. It turned out to be a pretty good mini case study for how semantics and graph databases can make these kinds of changes far less painful.
So I documented it in a youTube video. Enjoy Upgrade a non Temporal Database in Place