Add eslint rule and fix as many issues as possible

backend/src/services/DatabaseService.ts

@@ -1,7 +1,7 @@
 import { 
+  closeDatabaseHelper,
   initDatabaseHelper,
-  closeDatabaseHelper
-} from '../helpers/database';
+} from "../helpers/database";
 
 /**
  * Class to handle database actions
@@ -15,7 +15,7 @@ class DatabaseService {
    */
   static async initDatabase(MONGO_URL: string) {
     return await initDatabaseHelper({
-      mongoURL: MONGO_URL
+      mongoURL: MONGO_URL,
     });
   }