api: Allow reprocessing of stalled jobs

api/src/models/Track.js

@@ -202,7 +202,7 @@ class Track extends mongoose.Model {
 
     await this.save();
 
-    return await queue.add(
+    await queue.add(
       'processTrack',
       {
         trackId: this._id.toString(),

api/src/queue.js

@@ -1,5 +1,12 @@
-const Bull = require('bull')
+const Bull = require('bull');
 
-const config = require('./config')
+const config = require('./config');
 
-module.exports = new Bull('processQueue', config.redisUrl)
+module.exports = new Bull('processQueue', config.redisUrl, {
+  settings: {
+    // if the worker process is killed and restarted, e.g. due to reboot or
+    // upgrade, it is okay to wait for a timeout on the job and restart it
+    maxStalledCount: 3,
+    lockDuration: 120 * 1000,
+  },
+});