Yeah, that bit made me cringe a bit too, since you have to do the something similar for storing insurance policies (track when things become effective, including forward-dated changes, storing past versions, etc.). No predictions necessary in our case. I'm guessing dealing with the time dimension is a general property of any system that needs to store anything that qualifies as a legal contract.

It is true, however, that adding in that time dimension makes everything a much, much harder problem.