During dailyArchive, reconcileDayVotes may call processGameEndWithGame
per unjudged game, each invalidating every voter's stats cache. Since
dailyArchive already invalidates each archived user once at the end of
its per-user loop, the per-game fan-out is redundant. Add an opt-in
skipInvalidate flag and use it from reconcile. The live onGameCompleted
trigger path keeps invalidating as before. Stale data is impossible:
getStats also self-invalidates on the daily forDate rollover.
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