Add 5-minute polling fallback for webhook signal revalidation

[stylessh]

Summary

• Adds a useGitHubSignalPoll hook that polls the server every 5 minutes to check for webhook revalidation signals that may have been missed by the WebSocket connection
• Adds a getRevalidationSignalTimestamps server function that returns signal timestamps from the database
• Refactors useGitHubSignalStream into three composable hooks: useGitHubSignalStreamWebSocket (existing WS logic), useGitHubSignalPoll (new polling fallback), and useGitHubSignalStream (composes both)
• The first poll seeds timestamps without triggering invalidation to avoid false-positive refetches on mount

Test plan

• Verify WebSocket-based revalidation still works as before
• Simulate a missed WebSocket signal and confirm the poll catches it within 5 minutes
• Verify the first poll does not trigger unnecessary query invalidations
• Check debug logs for github-signal-poll entries

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Workers

The latest updates on your project. Learn more about integrating Git with Workers.

Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	diffkit	ad3d8e9	Apr 13 2026, 08:55 PM