Checkpoint: Problem with worker metdata for VapidKeys

src/subscriptionService.ts

@@ -1,6 +1,7 @@
 import { DBService } from './db.js';
+import { Subscription } from './Subscription.js';
 
-export interface Subscription {
+export interface SubscriptionData {
   endpoint: string;
   keys: {
     p256dh: string;
@@ -15,7 +16,7 @@ export class SubscriptionService {
     this.dbService = new DBService();
   }
 
-  async addSubscription(subscription: Subscription): Promise<void> {
+  async addSubscription(subscription: SubscriptionData): Promise<void> {
     await this.dbService.saveSubscription(
       subscription.endpoint,
       subscription.keys.p256dh,