fix(sync): add SSE heartbeat and alive status - #223
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Unintendedz
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Mar 3, 2026
jasonczc
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(cherry picked from commit 1942f08)
SeeFlowerX
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What / Why
Prevent silent SSE stalls and reduce “stale UI” issues by adding server heartbeats and smarter client reconnection + incremental cache updates.
Changes
/api/events: send periodic SSE heartbeats and includesubscriptionIdinconnection-changed.useSSE: heartbeat watchdog + reconnect backoff; batch invalidations; incremental patching for sessions/machines when possible.activestatus in alive updates; tighten machine/session cache refresh behavior.Tests
cd hub && bun testcd web && bun run testcd hub && bun run typecheckcd web && bun run typecheck