fix: reduce socket ping intervals and remove unreliable auto-delivery status updates in messages gateway

src/messages/messages.gateway.ts

@@ -29,6 +29,11 @@ interface AuthenticatedSocket extends Socket {
     credentials: true,
   },
   transports: ['websocket', 'polling'],
+  // Detect dead connections quickly when a client drops network abruptly
+  // (e.g. airplane mode). Default is 25s ping + 20s timeout = ~45s to notice.
+  // 5s ping + 5s timeout = ~10s detection, which keeps presence/ticks honest.
+  pingInterval: 5000,
+  pingTimeout: 5000,
 })
 export class MessagesGateway implements OnGatewayConnection, OnGatewayDisconnect {
   @WebSocketServer()
@@ -245,7 +250,13 @@ export class MessagesGateway implements OnGatewayConnection, OnGatewayDisconnect
       );
 
       // Send directly to the other participant's socket(s)
-      // This is the primary delivery mechanism — works even if they haven't joined the room
+      // This is the primary delivery mechanism — works even if they haven't joined the room.
+      // NOTE: We intentionally do NOT auto-mark as DELIVERED here based on Redis
+      // presence, because presence can lag behind reality (user turns off network
+      // but socket hasn't timed out yet). The receiver's client explicitly acks
+      // delivery via the `message_received` event once it actually receives
+      // `new_message` — that's the only reliable signal that the receiver's
+      // device got the payload.
       try {
         const participants = await this.messagesService.getConversationParticipants(data.conversationId);
         if (participants) {
@@ -253,22 +264,6 @@ export class MessagesGateway implements OnGatewayConnection, OnGatewayDisconnect
             ? participants.agentUserId
             : participants.userId;
           this.sendToUser(otherUserId, 'new_message', message);
-
-          // Auto-mark as DELIVERED if recipient is online
-          if (await this.isUserOnline(otherUserId)) {
-            const deliveredAt = new Date().toISOString();
-            await this.messagesService.markMessageDelivered(message.id);
-            // Update message object so sender gets correct status in callback
-            message = { ...message, status: 'DELIVERED' as any, deliveredAt } as any;
-
-            const deliveredEvent = {
-              messageId: message.id,
-              conversationId: data.conversationId,
-              deliveredAt,
-            };
-            // Also send event for clients that might have the old status cached
-            this.sendToUser(client.userId, 'message_delivered', deliveredEvent);
-          }
         }
       } catch (participantError) {
         this.logger.warn(`Failed to get participants for direct delivery in ${data.conversationId}: ${participantError.message}`);