feat: add auto-increment id, size/duration tracking, and soft cleanup to conversion_jobs

Rename the old CHAR(36) id to uuid (still used for public URLs and file
naming) and add a real auto-increment id as the primary key. Track
input/output file size and conversion duration per job. Cleanup no
longer deletes rows; it marks cleaned_at and skips already-cleaned
expired jobs on later runs.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/jobs/jobRepository.js

@@ -2,6 +2,7 @@ function toCamelJob(row) {
   if (!row) return null;
   return {
     id: row.id,
+    uuid: row.uuid,
     status: row.status,
     family: row.family,
     sourceFormat: row.source_format,
@@ -11,38 +12,44 @@ function toCamelJob(row) {
     outputPath: row.output_path,
     inputMimeType: row.input_mime_type,
     outputMimeType: row.output_mime_type,
+    inputSizeBytes: row.input_size_bytes,
+    outputSizeBytes: row.output_size_bytes,
+    conversionDurationSeconds: row.conversion_duration_seconds,
     errorMessage: row.error_message,
     createdAt: row.created_at,
     updatedAt: row.updated_at,
     expiresAt: row.expires_at,
+    cleanedAt: row.cleaned_at,
   };
 }
 
 export async function createJob(pool, job) {
   await pool.query(
     `INSERT INTO conversion_jobs
-      (id, status, family, source_format, target_format, original_filename, input_path, input_mime_type, expires_at)
-     VALUES (?, 'pending', ?, ?, ?, ?, ?, ?, ?)`,
+      (uuid, status, family, source_format, target_format, original_filename, input_path, input_mime_type, input_size_bytes, expires_at)
+     VALUES (?, 'pending', ?, ?, ?, ?, ?, ?, ?, ?)`,
     [
-      job.id,
+      job.uuid,
       job.family,
       job.sourceFormat,
       job.targetFormat,
       job.originalFilename,
       job.inputPath,
       job.inputMimeType,
+      job.inputSizeBytes,
       job.expiresAt,
     ]
   );
 }
 
-export async function getJobById(pool, id) {
+export async function getJobByUuid(pool, uuid) {
   const rows = await pool.query(
-    `SELECT id, status, family, source_format, target_format, original_filename,
+    `SELECT id, uuid, status, family, source_format, target_format, original_filename,
             input_path, output_path, input_mime_type, output_mime_type,
-            error_message, created_at, updated_at, expires_at
-     FROM conversion_jobs WHERE id = ?`,
-    [id]
+            input_size_bytes, output_size_bytes, conversion_duration_seconds,
+            error_message, created_at, updated_at, expires_at, cleaned_at
+     FROM conversion_jobs WHERE uuid = ?`,
+    [uuid]
   );
   return toCamelJob(rows[0]);
 }
@@ -56,10 +63,12 @@ export async function markProcessing(pool, id) {
   await pool.query("UPDATE conversion_jobs SET status = 'processing' WHERE id = ?", [id]);
 }
 
-export async function markDone(pool, id, { outputPath, outputMimeType }) {
+export async function markDone(pool, id, { outputPath, outputMimeType, outputSizeBytes, conversionDurationSeconds }) {
   await pool.query(
-    "UPDATE conversion_jobs SET status = 'done', output_path = ?, output_mime_type = ? WHERE id = ?",
-    [outputPath, outputMimeType, id]
+    `UPDATE conversion_jobs
+     SET status = 'done', output_path = ?, output_mime_type = ?, output_size_bytes = ?, conversion_duration_seconds = ?
+     WHERE id = ?`,
+    [outputPath, outputMimeType, outputSizeBytes, conversionDurationSeconds, id]
   );
 }
 
@@ -72,9 +81,10 @@ export async function markFailed(pool, id, { errorMessage, errorLog }) {
 
 export async function findPendingJobs(pool, limit) {
   const rows = await pool.query(
-    `SELECT id, status, family, source_format, target_format, original_filename,
+    `SELECT id, uuid, status, family, source_format, target_format, original_filename,
             input_path, output_path, input_mime_type, output_mime_type,
-            error_message, created_at, updated_at, expires_at
+            input_size_bytes, output_size_bytes, conversion_duration_seconds,
+            error_message, created_at, updated_at, expires_at, cleaned_at
      FROM conversion_jobs WHERE status = 'pending' ORDER BY created_at ASC LIMIT ?`,
     [limit]
   );
@@ -83,14 +93,15 @@ export async function findPendingJobs(pool, limit) {
 
 export async function findExpiredJobs(pool) {
   const rows = await pool.query(
-    `SELECT id, status, family, source_format, target_format, original_filename,
+    `SELECT id, uuid, status, family, source_format, target_format, original_filename,
             input_path, output_path, input_mime_type, output_mime_type,
-            error_message, created_at, updated_at, expires_at
-     FROM conversion_jobs WHERE expires_at < NOW()`
+            input_size_bytes, output_size_bytes, conversion_duration_seconds,
+            error_message, created_at, updated_at, expires_at, cleaned_at
+     FROM conversion_jobs WHERE expires_at < NOW() AND cleaned_at IS NULL`
   );
   return rows.map(toCamelJob);
 }
 
-export async function deleteJob(pool, id) {
-  await pool.query('DELETE FROM conversion_jobs WHERE id = ?', [id]);
+export async function markCleaned(pool, id) {
+  await pool.query('UPDATE conversion_jobs SET cleaned_at = NOW() WHERE id = ?', [id]);
 }