Task 4 rewrote src/db.js and src/jobs/jobRepository.js to use Prisma instead of the hand-rolled mariadb pool. This updates every remaining call site (app.js, server.js, worker.js, cleanup.js) and the 5 test files that still referenced getPool/closePool/pool.query, so the app and full test suite compile and run against Prisma Client. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>