add readAt functionality

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

@@ -1,6 +1,6 @@
 import { Injectable } from '@angular/core';
 import { Dexie, EntityTable, liveQuery } from 'Dexie';
-import { err, ok } from 'neverthrow';
+import { err, ok, Result } from 'neverthrow';
 import { z } from 'zod';
 import { from, Observable, Subject } from 'rxjs';
 import { filter, switchMap } from 'rxjs/operators';
@@ -73,6 +73,21 @@ export class MessageLocalDataSourceService {
   }
 
 
+  async getLastMessageByRoomId(roomId: string): Promise<Result<undefined|TableMessage, any>> {
+    try {
+      const lastMessage = await messageDataSource.message
+        .where('roomId')
+        .equals(roomId)
+        .reverse()
+        .sortBy('id');
+
+      return ok(lastMessage[0]); // Get the last message
+    } catch (error) {
+      return err(error);
+    }
+  }
+
+
   async sendMessage(data: MessageInputDTO) {
 
     (data as TableMessage).sending = true