Minor fix

src/services/database.service.ts

@@ -1,6 +1,13 @@
 import Services from './service';
 
+/**
+ * Database service managing IndexedDB operations via Web Worker and Service Worker
+ */
 export class Database {
+  // ============================================
+  // PRIVATE PROPERTIES
+  // ============================================
+  
   private static instance: Database;
   private serviceWorkerRegistration: ServiceWorkerRegistration | null = null;
   private serviceWorkerCheckIntervalId: number | null = null;
@@ -155,13 +162,11 @@ export class Database {
     });
   }
 
-  private async checkForUpdates() {
+  private async checkForUpdates(): Promise<void> {
     if (this.serviceWorkerRegistration) {
-      // Check for updates to the service worker
       try {
         await this.serviceWorkerRegistration.update();
 
-        // If there's a new worker waiting, activate it immediately
         if (this.serviceWorkerRegistration.waiting) {
           this.serviceWorkerRegistration.waiting.postMessage({ type: 'SKIP_WAITING' });
         }