callebtc 19a6474eae Keep geohash chat writers counted beyond the message cap
Chatters were derived from the retained messages, which are capped at
500 per channel, so in a busy channel someone who wrote ten minutes ago
dropped out of the headcount and roster once 500 newer messages arrived,
and prune then forgot their last-seen time. Track each writer's newest
chat time separately; the cap now bounds only the message count.
2026-10-27 17:44:49 +01:00
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