better description

backend/controllers/events.js

@@ -241,6 +241,7 @@ const savePodcast = (event, podcastUrl) => {
         }
     });
     podcast.len = totalTime;
+    podcast.eventUrl = frontend_server + "/events/" + event._id;
     podcast.save();
 }
 

backend/models/podcast.js

@@ -11,6 +11,7 @@ var podcastSchema = mongoose.Schema({
   downloadUrl: String,
   systems: [String],
   numCalls: Number,
+  eventUrl: String,
   len: Number
 },
 {