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Oliver Kieselbach
d093be3e8d
Chrome and Edge run the timers of a tab hidden for five minutes once a minute; the client then misses
its keep-alive, the service closes the connection and the automatic reconnect restores it, a loop every
minute in every background tab. lib/signalrPark.ts, a pure state machine tested with an injected clock,
parks the shared connection after four minutes hidden and resumes it on the first visible signal. The
resume ends a gap, so every view re-reads through useSignalRResync. A failed resume retries with backoff
up to 30 s until the next park; no park starts during an accessRevoked restart. Telemetry:
signalr_parked { hiddenMs } and signalr_resumed { parkedMs, transport }; park and resume emit neither
signalr_disconnected nor signalr_connected.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>