Wire the app, worker, and cleanup entry points onto Prisma Client

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>

test/worker.test.js

@@ -3,30 +3,30 @@ import fs from 'node:fs/promises';
 import path from 'node:path';
 import os from 'node:os';
 import sharp from 'sharp';
-import { getPool, closePool } from '../src/db.js';
+import { getPrismaClient, closePrismaClient } from '../src/db.js';
 import { loadConfig } from '../src/config.js';
 import { ensureStorageDirs, uploadPath, outputPath } from '../src/storage.js';
 import { createJob, getJobByUuid, getJobErrorLog } from '../src/jobs/jobRepository.js';
 import { registerImageConverters } from '../src/converters/image.js';
 import { processPendingJobs } from '../src/worker.js';
 
-let pool;
+let prisma;
 let config;
 
 beforeAll(async () => {
   registerImageConverters();
   config = { ...loadConfig(), storageDir: await fs.mkdtemp(path.join(os.tmpdir(), 'converter-worker-')) };
   await ensureStorageDirs(config);
-  pool = getPool(config);
+  prisma = getPrismaClient(config);
 });
 
 afterAll(async () => {
-  await closePool();
+  await closePrismaClient();
   await fs.rm(config.storageDir, { recursive: true, force: true });
 });
 
 beforeEach(async () => {
-  await pool.query('DELETE FROM conversion_jobs');
+  await prisma.conversionJob.deleteMany();
 });
 
 async function createPendingImageJob(uuid, sourceFormat, targetFormat) {
@@ -35,7 +35,7 @@ async function createPendingImageJob(uuid, sourceFormat, targetFormat) {
   await fs.copyFile(fixturePath, inputFilePath);
   const { size: inputSizeBytes } = await fs.stat(inputFilePath);
 
-  await createJob(pool, {
+  await createJob(prisma, {
     uuid,
     family: 'image',
     sourceFormat,
@@ -53,10 +53,10 @@ describe('processPendingJobs', () => {
     const uuid = '99999999-9999-4999-8999-999999999999';
     await createPendingImageJob(uuid, 'png', 'webp');
 
-    const processedCount = await processPendingJobs(pool, config);
+    const processedCount = await processPendingJobs(prisma, config);
 
     expect(processedCount).toBe(1);
-    const job = await getJobByUuid(pool, uuid);
+    const job = await getJobByUuid(prisma, uuid);
     expect(job.status).toBe('done');
     expect(job.outputPath).toBe(`${uuid}.webp`);
     expect(job.outputMimeType).toBe('image/webp');
@@ -86,7 +86,7 @@ describe('processPendingJobs', () => {
       await fs.writeFile(uploadPath(config, uuid, 'png'), noisyBuffer);
     }
 
-    await createJob(pool, {
+    await createJob(prisma, {
       uuid: lowUuid,
       family: 'image',
       sourceFormat: 'png',
@@ -98,7 +98,7 @@ describe('processPendingJobs', () => {
       expiresAt: new Date(Date.now() + 3600 * 1000),
       quality: 5,
     });
-    await createJob(pool, {
+    await createJob(prisma, {
       uuid: defaultUuid,
       family: 'image',
       sourceFormat: 'png',
@@ -110,10 +110,10 @@ describe('processPendingJobs', () => {
       expiresAt: new Date(Date.now() + 3600 * 1000),
     });
 
-    await processPendingJobs(pool, { ...config, workerConcurrency: 2 });
+    await processPendingJobs(prisma, { ...config, workerConcurrency: 2 });
 
-    const lowJob = await getJobByUuid(pool, lowUuid);
-    const defaultJob = await getJobByUuid(pool, defaultUuid);
+    const lowJob = await getJobByUuid(prisma, lowUuid);
+    const defaultJob = await getJobByUuid(prisma, defaultUuid);
     expect(lowJob.status).toBe('done');
     expect(defaultJob.status).toBe('done');
     expect(lowJob.outputSizeBytes).toBeLessThan(defaultJob.outputSizeBytes);
@@ -121,7 +121,7 @@ describe('processPendingJobs', () => {
 
   it('marks a job failed with a safe message and a detailed log when the converter throws', async () => {
     const uuid = 'aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa';
-    await createJob(pool, {
+    await createJob(prisma, {
       uuid,
       family: 'image',
       sourceFormat: 'png',
@@ -134,13 +134,13 @@ describe('processPendingJobs', () => {
     });
     // Note: input file is intentionally never written, so sharp will throw ENOENT.
 
-    await processPendingJobs(pool, config);
+    await processPendingJobs(prisma, config);
 
-    const job = await getJobByUuid(pool, uuid);
+    const job = await getJobByUuid(prisma, uuid);
     expect(job.status).toBe('failed');
     expect(job.errorMessage).toBe('Conversion failed, please try again.');
 
-    const errorLog = await getJobErrorLog(pool, job.id);
+    const errorLog = await getJobErrorLog(prisma, job.id);
     expect(errorLog).toMatch(/input file is missing/i);
   });
 
@@ -150,7 +150,7 @@ describe('processPendingJobs', () => {
     await createPendingImageJob('dddddddd-dddd-4ddd-8ddd-dddddddddddd', 'png', 'webp');
 
     const limitedConfig = { ...config, workerConcurrency: 2 };
-    const processedCount = await processPendingJobs(pool, limitedConfig);
+    const processedCount = await processPendingJobs(prisma, limitedConfig);
 
     expect(processedCount).toBe(2);
   });