feat: Add notifications

toju-app/src/app/infrastructure/persistence/browser-database.service.ts

@@ -75,6 +75,17 @@ export class BrowserDatabaseService {
       .map((message) => this.normaliseMessage(message));
   }
 
+  async getMessagesSince(roomId: string, sinceTimestamp: number): Promise<Message[]> {
+    const allRoomMessages = await this.getAllFromIndex<Message>(
+      STORE_MESSAGES, 'roomId', roomId
+    );
+
+    return allRoomMessages
+      .filter((message) => message.timestamp > sinceTimestamp)
+      .sort((first, second) => first.timestamp - second.timestamp)
+      .map((message) => this.normaliseMessage(message));
+  }
+
   /** Delete a message by its ID. */
   async deleteMessage(messageId: string): Promise<void> {
     await this.deleteRecord(STORE_MESSAGES, messageId);