More webapp changes+fixes

webapp/src/app/core/models/delivery.model.ts

@@ -0,0 +1,18 @@
+export type DeliveryStatus = 'RETRY' | 'SUCCESS' | 'FAILED';
+
+export interface Delivery {
+  delivery_id: string;
+  message_id: string;
+  receiver_user_id: string;
+  receiver_client_id: string;
+  timestamp_created: string;
+  timestamp_finalized: string | null;
+  status: DeliveryStatus;
+  retry_count: number;
+  next_delivery: string | null;
+  fcm_message_id: string | null;
+}
+
+export interface DeliveryListResponse {
+  deliveries: Delivery[];
+}