Making createdBy field required

app.ts

@@ -29,8 +29,7 @@ app.use(express.json());
 // Configure CORS
 let allowedHosts = [
 	'https://www.nachklang.art',
-	'https://calendar.nachklang.art',
-	'http://localhost:4200'
+	'https://calendar.nachklang.art'
 ];
 app.use(cors({
 	origin: function (origin: any, callback: any) {