fix: normalize scheduled_at comparison on SQLite

[jp-knj]

What does this PR do?

In SQLite, scheduled_at is stored in ISO 8601 format (2026-05-04T17:26:23Z), but datetime('now') returns 2026-05-04 17:26:23. They're compared as strings, so within the same day T is greater than a space and the row appears to be in the future. As a result, scheduled posts stayed hidden until UTC midnight.

This PR switches the right-hand side to strftime('%Y-%m-%dT%H:%M:%fZ', 'now') so both sides use the same format.

api/handlers/snapshot.ts has the same bug. I've split that fix into #1159 (currently draft) and will mark it as ready once this PR is merged.

Closes #917

Type of change

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

Checklist

• I have read CONTRIBUTING.md
• pnpm typecheck passes
• pnpm lint passes
• pnpm test passes (or targeted tests for my change)
• pnpm format has been run
• I have added/updated tests for my changes (if applicable)
• User-visible strings in the admin UI are wrapped for translation (if applicable). Do not include messages.po changes except in translation PRs — a workflow extracts catalogs on merge to main.
• 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 — model/tool: Claude Opus 4.7

[changeset-bot]

🦋 Changeset detected

Latest commit: 9253748

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

This PR includes changesets to release 14 packages

Name	Type
emdash	Patch
@emdash-cms/cloudflare	Patch
@emdash-cms/sandbox-workerd	Patch
@emdash-cms/fixture-perf-site	Patch
@emdash-cms/perf-demo-site	Patch
@emdash-cms/cache-demo-site	Patch
@emdash-cms/admin	Patch
@emdash-cms/auth	Patch
@emdash-cms/blocks	Patch
@emdash-cms/gutenberg-to-portable-text	Patch
@emdash-cms/x402	Patch
create-emdash	Patch
@emdash-cms/auth-atproto	Patch
@emdash-cms/plugin-embeds	Patch

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[github-actions]

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[Copilot]

Pull request overview

Fixes a SQLite/D1-specific scheduled publishing visibility bug caused by lexicographic comparison between ISO-8601 scheduled_at strings (...T...Z) and SQLite’s space-separated datetime('now') output, ensuring scheduled items become visible once due (matching Postgres behavior).

Changes:

• Normalizes the SQLite scheduled_at <= now comparison in the loader’s buildStatusCondition via SQLite datetime normalization.
• Applies the same SQLite normalization to the snapshot exporter’s published/scheduled WHERE clause.
• Adds a dialect-parametric regression test covering past-vs-future scheduled visibility.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
packages/core/src/loader.ts	Fixes scheduled visibility logic on SQLite/D1 by normalizing scheduled_at comparisons when widening published reads to include due scheduled items.
packages/core/src/api/handlers/snapshot.ts	Aligns snapshot export filtering with the corrected SQLite scheduled/published visibility predicate.
packages/core/tests/unit/loader-scheduled-publishing.test.ts	Adds regression coverage across supported dialects for due vs not-due scheduled content visibility.
.changeset/red-deer-wash.md	Records the patch-level change and user-facing bugfix description for release notes.

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[jp-knj]

I have read the CLA Document and I hereby sign the CLA

[ascorbic]

Thank you!

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commit: 88061d5