bun-sqlite's Database.transaction is synchronous, but async callbacks return
a pending Promise at the first await, causing immediate COMMIT before the
entire callback completes. This allowed partial inserts with no rollback.
Fixed by:
- Remove async from transaction callback
- Add .run() to each insert/update to execute synchronously
- Add regression test proving atomicity: transaction that throws mid-loop
rolls back all changes (both tables empty after failure)
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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