Backfill thread titles in migrations

[chloeilabs]

Summary

• add title to existing thread tables during threads:migrate
• backfill missing titles from the first stored message with a safe fallback
• enforce NOT NULL after the backfill so runtime queries cannot fail on old installs

Verification

• applied the migration directly to production
• verified the production thread table now has title and isPinned
• verified no new production GET / 500 logs after the fix

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Project	Deployment	Actions	Updated (UTC)
finance	Ready	Preview, Comment	Apr 19, 2026 3:37am

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 5cdb8cad-3776-4a1a-bd19-702b151aa7b9

📥 Commits

Reviewing files that changed from the base of the PR and between 2359906 and a36c170.

📒 Files selected for processing (1)

• threads-migrate.mjs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/backfill-thread-titles-migration

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