fix(migrations): grandfather the shipped 0090 duplicate

[JSONbored]

Summary

• 0090_contributor_cap_label.sql (feat(agent-actions): auto-close a contributor's PR over the open-PR cap (#2270) #2479) and 0090_pull_request_detail_sync_head_sha.sql (fix(selfhost): cap historical PR file hydration and cache by head SHA #2527) both merged to main with the same migration number, so npm run db:migrations:check currently fails on main itself — and therefore fails the required validate check on every PR that touches src/** (the backend path filter), not just migration PRs.
• Both are bare ALTER TABLE ... ADD COLUMN statements already applied in production, so renumbering either now would make wrangler (and the self-host migrator) try to re-apply an already-shipped, non-idempotent migration and error the deploy. Per the script's own documented policy for this exact situation (see the 0015/0017/0074 precedents), the fix is to grandfather 0090 into KNOWN_DUPLICATES, not rename either file.
• Updated the one test that asserts the exact grandfathered-duplicates count in the success summary.

No issue filed for this — it's a small, self-evident infra fix blocking CI for unrelated PRs, following the exact precedent already established in scripts/check-migrations.mjs for prior duplicate collisions.

Scope

• The PR title follows type(scope): short summary Conventional Commit format, for example fix(api): restore profile access checks.
• This PR is focused and does not mix unrelated backend, UI, MCP, docs, dependency, and deploy changes.
• This follows CONTRIBUTING.md and does not reintroduce GitHub Pages, VitePress, site/, or CNAME.
• I linked an issue, or this is small enough that the summary explains why an issue is not needed.

Validation

• git diff --check
• npm run actionlint
• npm run typecheck
• npm run test:coverage locally; scripts/** and test/** carry no Codecov patch obligation, but the affected test (test/unit/check-migrations-script.test.ts) was updated and passes.
• npm run test:workers
• npm run build:mcp
• npm run test:mcp-pack
• npm run ui:openapi:check
• npm run ui:lint
• npm run ui:typecheck
• npm run ui:build
• npm audit --audit-level=moderate
• New or changed behavior has unit/integration tests for new branches, fallback paths, and sanitizer boundaries

Safety

• No secrets, wallet details, hotkeys, coldkeys, user PATs, private keys, raw trust scores, private rankings, or private maintainer evidence are exposed.
• Public GitHub text stays sanitized, low-noise, and does not imply compensation guarantees or optimization tactics.
• Auth, cookie, CORS, GitHub App, Cloudflare, or session changes include negative-path tests.
• API/OpenAPI/MCP behavior is updated and tested where needed.
• UI changes use live API data or real empty/error/loading states, not production mock/demo fallbacks.
• Visible UI changes include a UI Evidence section below with JPG/JPEG or PNG screenshots — N/A, no UI changes.
• Public docs/changelogs are updated where needed; changelogs are only edited for release-prep PRs.

Notes

• Not part of the chore(selfhost): beta-stable release readiness roadmap #1936 self-host readiness batch; this is a standalone fix for a main-breaking migration numbering collision discovered while running the local gate for that batch.

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Important

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_{🟩 Safe / merged · 🟦 Advisory · 🟨 Held for review · 🟥 Blocked / closed · 🟪 Reviewing}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.96%. Comparing base (67e7b03) to head (300524c).
⚠️ Report is 31 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2532      +/-   ##
==========================================
+ Coverage   95.95%   95.96%   +0.01%     
==========================================
  Files         226      228       +2     
  Lines       25391    25702     +311     
  Branches     9234     9346     +112     
==========================================
+ Hits        24363    24666     +303     
- Misses        417      425       +8     
  Partials      611      611              

see 2 files with indirect coverage changes

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[JSONbored]

Superseded — main already carries an identical grandfathered-0090 fix via #2528 (landed on top of #2517's temp-schema detection improvements, which this branch predates). Closing rather than rebasing a now-stale/regressive diff.