remove duplicate

src/app/module/chat/data/repository/message/message-local-data-source.service.ts

@@ -6,6 +6,8 @@ import { Observable as  DexieObservable, PromiseExtended } from 'Dexie';
 import { MessageTable, MessageTableSchema } from 'src/app/infra/database/dexie/instance/chat/schema/message';
 import { chatDatabase } from 'src/app/infra/database/dexie/service';
 import { IMessageLocalRepository } from 'src/app/core/chat/repository/message/message-local-repository';
+import { combineLatest, from, Observable } from 'rxjs';
+import { map } from 'rxjs/operators';
 
 @Injectable({
   providedIn: 'root'
@@ -49,5 +51,25 @@ export class MessageLocalDataSourceService extends DexieRepository<MessageTable,
       console.error('Error fetching messages:', error);
     }
   }
+
+
+
+  getLastMessageForRooms(roomIds: string[]): Observable<any[]> {
+    const observables = roomIds.map(roomId =>
+      from (liveQuery(async() =>{
+        const messages = await chatDatabase.message
+          .where('roomId')
+          .equals(roomId)
+          .reverse()
+          .sortBy('timestamp')
+
+        return messages[0] || null; // Return the first item (latest message) or null if no message
+      })).pipe(
+        map((message) => ({ roomId, message: message || null })) // Attach roomId to the result
+      )
+    );
+
+    return combineLatest(observables); // Combine all observables into one array of results
+  }
 }