So currently for domains, we have an active indicator which just says whether or not a form was submitted to that domain in the last 30 days. In order to make this indicator easily accessible for the global reports facets, it needs to calculated before hand. So it twice a day, that property gets calculated for every domain.

Recently people have been wanting to facet by active apps in the app list. So I pretty much use the same strategy i used for domains for apps.