feat(github): run backfills directly in actions

[f0rr0]

Summary

• run manual historical backfills directly in GitHub Actions instead of calling a Vercel route
• accept arbitrary inclusive date ranges, split them into bounded requests, and bisect requests that exceed the durable observation cap
• process durable work for up to 330 minutes with Action-only batch limits while leaving routine Vercel cron limits unchanged
• remove the obsolete backfill endpoint and bearer secret from application configuration
• document the four typed Action secrets and direct/session versus transaction-pooler roles

Validation

• bun test (128 passing)
• bun run typecheck
• bun run lint
• actionlint .github/workflows/github-activity-backfill.yml
• bun run build
• git diff --check

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
f0rr0-github-io	Ready	Preview	Aug 29, 2026 5:52pm