The quick-status auto-clear removed its localStorage record BEFORE the
presence write and swallowed any error, so a single failure dropped the
timer permanently and the status stayed set forever. Synapse rate-limits
presence to ~1 write / 10 s per user (#226) and the heartbeat spends that
budget, so 429s here are routine — especially right after startup, when
the monitor's first check runs.
The clear now goes through setPresenceWithRetry (honours retry_after_ms)
and only forgets the status once the server has taken it; a re-entry guard
stops overlapping attempts and the poll is 15 s so a retry lands promptly.
Reproduced and verified with three injected 429s: before, the status
stayed on the server forever with the local record gone; now it clears.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA