Named, cross-player, and visible only to the ids in ADMIN_USER_IDS. Everyone else sees their own record plus an anonymous group average.
This is a review log for your own TFT games. Link your Riot account and your recent matches get pulled in automatically — you tell it which comp you played, and over a few weeks it shows you how you actually do in each line you pick.
Two accounts, because right now that's a PBE account and your live one once the set launches. Your notes are visible to everyone else in the group.