#1 spots per player
Arenas top 20 each
Recent #1 changes last 14 days of hourly snapshots
New submit: a submission from the last 24 h reaching #1 for the first time (an identical resubmit counts too). Placement: a bot still in placement moving in or out of #1. Reshuffle: the same settled bots swapping #1 as third-party submits move the ratings (repeat swaps folded).