## Summary
- The `createMany` API was returning records in arbitrary order because
`fetchUpsertedRecords` used `WHERE id IN (...)` without `ORDER BY`
- This caused flaky tests that assumed input order was preserved (e.g.,
`people-merge-many.integration-spec.ts`)
- Fixed by reordering the fetched records to match the original input
order from `generatedMaps`
## Root Cause
```typescript
// Before: No ORDER BY, so SQL returns in arbitrary order
const upsertedRecords = await queryBuilder
.where({ id: In(objectRecords.generatedMaps.map((record) => record.id)) })
.getMany(); // Returns in arbitrary order!
```
## Fix
```typescript
// After: Reorder results to match original input order
const orderedIds = objectRecords.generatedMaps.map((record) => record.id);
const upsertedRecords = await queryBuilder
.where({ id: In(orderedIds) })
.getMany();
// Preserve original input order
const recordsById = new Map(upsertedRecords.map((record) => [record.id, record]));
return orderedIds
.map((id) => recordsById.get(id))
.filter((record) => record !== undefined);
```
## Test plan
- [x] Run `people-merge-many.integration-spec.ts` multiple times -
passes consistently
- [x] Lint passes
