Seed batches: test chunked inserts with a lowered chunk size

The 6,000-file test took 29 s and failed CI; 120 files in chunks of 50
cover the same path.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/services/FileStore.ts

@@ -36,8 +36,8 @@ export function loadedSegments(stored: Buffer | null): Segment[] {
   return stored ? unpackSegments(stored) : []
 }
 
-/** Rows per INSERT, well below Postgres' 65,535 bind parameters. */
-export const INSERT_ROWS = 2000
+/** Rows per INSERT, well below Postgres' 65,535 bind parameters (tests lower it). */
+export const insertLimits = { rows: 2000 }
 
 class FileStore {
   /**
@@ -71,8 +71,8 @@ class FileStore {
     if (rows.length === 0) return []
     // A statement takes at most 65,535 parameters: ~5,400 rows of 12 columns.
     const inserted: { id: number; filename: string }[] = []
-    for (let i = 0; i < rows.length; i += INSERT_ROWS) {
-      const chunk = await client.knexQuery().table('files').insert(rows.slice(i, i + INSERT_ROWS)).onConflict().ignore().returning(['id', 'filename'])
+    for (let i = 0; i < rows.length; i += insertLimits.rows) {
+      const chunk = await client.knexQuery().table('files').insert(rows.slice(i, i + insertLimits.rows)).onConflict().ignore().returning(['id', 'filename'])
       for (const row of chunk) inserted.push({ id: Number(row.id), filename: row.filename })
     }
     return inserted