perf(db): add published_at composite index for frontend listing queries

[mvanhorn]

What does this PR do?

Closes #277

Adds a composite index (deleted_at, published_at DESC, id DESC) to all ec_* content tables. The frontend listing query orders by published_at, but no existing index covers it. On a site with ~16k posts this causes ~15,883 rows read per query (full table scan).

Also registers migration 033 (optimize_content_indexes) which existed on disk but was missing from the StaticMigrationProvider.

Type of change

• Bug fix
• Feature (requires approved Discussion)
• Refactor (no behavior change)
• Documentation
• Performance improvement
• Tests
• Chore (dependencies, CI, tooling)

Checklist

• I have read CONTRIBUTING.md
• pnpm typecheck passes
• pnpm --silent lint:json | jq '.diagnostics | length' returns 0
• pnpm test passes (or targeted tests for my change)
• pnpm format has been run
• I have added/updated tests for my changes (if applicable)
• I have added a changeset (if this PR changes a published package)
• New features link to an approved Discussion: https://github.com/emdash-cms/emdash/discussions/...

AI-generated code disclosure

• This PR includes AI-generated code

This contribution was developed with AI assistance (Codex).

[changeset-bot]

🦋 Changeset detected

Latest commit: beefc8a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 9 packages

Name	Type
emdash	Patch
@emdash-cms/cloudflare	Patch
@emdash-cms/plugin-ai-moderation	Patch
@emdash-cms/plugin-atproto	Patch
@emdash-cms/plugin-audit-log	Patch
@emdash-cms/plugin-color	Patch
@emdash-cms/plugin-embeds	Patch
@emdash-cms/plugin-forms	Patch
@emdash-cms/plugin-webhook-notifier	Patch

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commit: beefc8a

[github-actions]

Overlapping PRs

This PR modifies files that are also changed by other open PRs:

• fix: content type form validation, URL pattern defaults, and label uniqueness #254 (5 shared files)

This may cause merge conflicts or duplicated work. A maintainer will coordinate.

[ascorbic]

Could you fix the conflicts? It'd be good to get this in

[mvanhorn]

@ascorbic rebased on main (beefc8a) and resolved conflicts:

• packages/core/src/database/migrations/runner.ts: kept the new MIGRATIONS constant from main, added "034_published_at_index": m034 to it, and removed the old inline dict in getMigrations() (now just return MIGRATIONS)
• packages/core/tests/database/migrations.test.ts, tests/integration/database/migrations.test.ts, tests/integration/database/dialect-compat.test.ts: swapped my hardcoded migration count (33) for the new MIGRATION_COUNT constant exported from runner.ts

All 2252 tests pass locally after the rebase. Let me know if there's anything else you'd like me to tweak.

[ascorbic]

Thanks!