"I don't have a great way of testing the nightly against the volume of data available in our prod environment, but just looking at the new implementation, it seems to be an improvement in design. However the new rake task does concern me -- iterating through every value change is going to take an extremely long time to run for anyone who has a lot of historical trend data. It should be fine if you're standing up a new instance, but I'm worried about how long that's going to take to run on our prod database."

(https://github.com/theforeman/foreman/pull/2365#issuecomment-101443798)