[recipes] Fix UUID cursor in fingerprint dedup backfill

[demarant]

Contribution Type

• Recipe (/recipes)
• Schema (/schemas)
• Dashboard (/dashboards)
• Integration (/integrations)
• Skill (/skills)
• Repo improvement (docs, CI, templates)

What does this do?

Fixes the fingerprint dedup backfill scripts to work with UUID primary keys on the thoughts table. Changed cursor pagination from id (integer) to created_at (timestamp), which works for any ID type and resolves the error invalid input syntax for type uuid: "0".

Requirements

• Node.js 18+
• Content Fingerprint Dedup primitive applied (so content_fingerprint column exists on thoughts table)

Checklist

• I've read CONTRIBUTING.md
• My contribution has a README.md with prerequisites, step-by-step instructions, and expected outcome
• My metadata.json has all required fields
• If my contribution depends on a skill or primitive, I declared it in metadata.json and linked it in the README — depends on content-fingerprint-dedup primitive (declared in existing README)
• I tested this on my own Open Brain instance — 1815 rows backfilled successfully, 10 duplicates skipped, 0 errors
• No credentials, API keys, or secrets are included

Test Results

$ node backfill-fingerprints.mjs

=== Backfill content_fingerprint ===
Resuming from cursor created_at=1970-01-01T00:00:00Z (0 already done)
Batch size: 1000

Batch 1: fetching from created_at>1970-01-01T00:00:00Z… 1000 rows. Patching…
  → 1000 patched. Total: 1000 patched, 0 duplicates, 0 errors. Cursor: 2025-04-12T13:52:40+00:00
Batch 2: fetching from created_at>2025-04-12T13:52:40+00:00… 825 rows. Patching…
  → 815 patched, 10 duplicates (skipped). Total: 1815 patched, 10 duplicates, 0 errors. Cursor: 2026-04-03T07:41:36.188656+00:00
Batch 3: fetching from created_at>2026-04-03T07:41:36.188656+00:00… (no rows) — Done.

=== COMPLETE ===
Total rows backfilled   : 1815
Total duplicate skipped : 10
Total other errors      : 0
State file cleaned up.

Outcome: ✅ Fix verified working on real Open Brain database with UUID primary key.