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## Summary - send desktop presence heartbeats every 60 seconds instead of every 30 seconds - extend presence TTL from 90 to 180 seconds to preserve the existing three-heartbeat expiry window - add mutation-sensitive tests that pin the one-minute / three-window timing contract - update presence documentation to match This halves steady-state **desktop** presence `SET` + `PUBLISH` traffic while retaining tolerance for two missed heartbeats. Mobile already uses a 60-second heartbeat, so the fleet-wide reduction depends on desktop's share of connected clients. ## Rollout order Deploy the relay TTL increase before shipping the desktop heartbeat change. Old desktop + new relay is safe; new desktop + old relay leaves only a 90-second TTL on a 60-second cadence and can flap after one missed heartbeat. ## Verification At initial live-test commit `00816e233b187bc5ba12c667d675ed050a8cc1c9`: - isolated clean-room relay built from the exact SHA against fresh Postgres, Redis, and MinIO - live Redis `MONITOR` observed kind-20001 writes as `SET ... EX 180`, global `PUBLISH`, and clean-disconnect / explicit-offline `DEL` - normal workflows passed: channel create/update/archive/unarchive; message send/get/reply/thread/search; archived-channel write rejection and resumed write after unarchive At follow-up commit `bf38a8c5c96f196ff8ee46e48d4141ee7811f186`: - `pnpm -C desktop test` — 3829 passed - `pnpm -C desktop typecheck` - `cargo test -p buzz-pubsub` — 24 passed, 11 Redis-dependent tests ignored - mutation probes fail when the server TTL changes to `999999` or the desktop heartbeat changes back to 30 seconds - `git diff --check` The pre-push suite's relevant checks passed, but its unrelated Tauri clippy step fails on current `origin/main`: `desktop/src-tauri/src/linux_media.rs` has three dead-code warnings on macOS. This PR does not modify that file, so the branch was pushed after independently running the suites above. ## Buzz context Originating channel: `buzz-redis-cluster-mode` (`f4e36d32-afdb-447f-8c87-ab003e069d18`) --------- Signed-off-by: npub1t2tgm7d8f995uqvmnm8h88sg3wnpp9a5xysjf6dg3tjmgt3ltulqdp8ehr <5a968df9a7494b4e019b9ecf739e088ba61097b4312124e9a88ae5b42e3f5f3e@buzz.block.builderlab.xyz> Co-authored-by: npub1t2tgm7d8f995uqvmnm8h88sg3wnpp9a5xysjf6dg3tjmgt3ltulqdp8ehr <5a968df9a7494b4e019b9ecf739e088ba61097b4312124e9a88ae5b42e3f5f3e@buzz.block.builderlab.xyz>