fix: chunk IDs in hydrateEntryBylines to avoid D1 SQL variable limit

[JiayuuWang]

Summary

Fixes #219.

Cloudflare D1 enforces a SQL bound-parameter limit lower than SQLite's default 999. When getEmDashCollection returns a large result set, hydrateEntryBylines passed all entry IDs in one call to getBylinesForEntries, which builds unbounded IN (?, ?, …) clauses across three code paths:

1. BylineRepository.getContentBylinesMany — WHERE cb.content_id IN (…)
2. getAuthorIds fallback — WHERE id IN (…)
3. BylineRepository.findByUserIds — WHERE user_id IN (…)

On collections with 50+ entries this triggers D1_ERROR: too many SQL variables, and byline data is silently dropped (caught by the existing try/catch).

Fix

Chunk the ID array in hydrateEntryBylines into batches of 50 before calling getBylinesForEntries, then merge the result maps. This is the single control point for all three downstream queries. A batch size of 50 stays well within D1's limit while keeping round-trips low.

const CHUNK_SIZE = 50;
type BylinesMap = Awaited<ReturnType<typeof getBylinesForEntries>>;
const bylinesMap: BylinesMap = new Map();
for (let i = 0; i < ids.length; i += CHUNK_SIZE) {
  const chunkMap = await getBylinesForEntries(type, ids.slice(i, i + CHUNK_SIZE));
  for (const [k, v] of chunkMap) {
    bylinesMap.set(k, v);
  }
}

Test plan

• Deploy a collection with 60+ published entries to a Cloudflare Workers environment
• Call getEmDashCollection('posts', { limit: 100 }) — should succeed with byline data hydrated
• Verify no D1_ERROR: too many SQL variables errors in the Worker logs

🤖 Generated with Claude Code

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[ascorbic]

Thanks for the contribution. This has already been fixed in #223 so I'm closing it.