I am sure there must be something to track this... Thought maybe https://stats.nostr.band/ might have something, but no such luck.

nostr:nprofile1qqs04xzt6ldm9qhs0ctw0t58kf4z57umjzmjg6jywu0seadwtqqc75spz9mhxue69uhnzdps9enrw73wd9hj7qgkwaehxw309ajkgetw9ehx7um5wghxcctwvshszrnhwden5te0dehhxtnvdakz76q24xa I know you were mentioning some idea about being able to see when users were active for the sake of scheduling posts. You know of anything currently out there?