MoriSpumae
Villager
So, "last time edited" is a thing that I did find. I'm sure they have more detailled info interally on that. However I think it's difficult to just assume that people not using hit points means that they aren't actively using the character. Obviously printing a sheet completely takes it out of their view, but many people (me included) play on roll20 or other VTTs and use hit points there.They do - D&D Beyond knows how often hit points go up and down, level-ups, short rests, and long rests get used, for example, and they can reasonably guess when someone's actually using the character in play. I didn't think D&DB exposed that to anyone else.
I would assume they do have a metric for how regularly the sheet is being viewed, which would probably be best for "active status".