Replace polling with SSE push for tasks/workers lists#12
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The tasks and workers list pages previously polled every 2s via hx-trigger="every 2s", firing requests whether or not anything changed. Now mutation handlers (create, claim, run, cancel, finish, delete for tasks; launch, stop, delete for workers) notify an in-process EventHub, which broadcasts to SSE subscribers. The HTMX tables connect via sse-connect and refresh only when they receive a "tasks-changed" or "workers-changed" event. Also cleans up NextUp.md: removes completed items (branch protection, SSE list push, UI modernization candidate). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
hx-trigger="every 2s"polling on tasks and workers list pages with SSE-based pushEventHubpub/sub (server/event_hub.go) — mutation handlers callNotify(), SSE endpoints fan out to connected browsers/ui/sse/tasksand/ui/sse/workerssend named events; HTMXsse-connect+hx-trigger="sse:tasks-changed"triggers the partial re-fetch only when data actually changesDesign
The
EventHubis intentionally minimal: buffered(1) channels per subscriber with non-blocking send means rapid mutations coalesce into a single event. SSE endpoints send an initial event on connect for catch-up, plus 30s keepalive pings.Notifications are wired to state-changing mutations only — not worker heartbeats or progress updates (neither is visible in the list tables).
Test plan
make docker-test— Go unit tests passmake docker-test-smoke— smoke test passesmake docker-test-browser— all 22 Playwright tests pass (updated auto-refresh tests to assert SSE attributes)🤖 Generated with Claude Code