```dart
import 'dart:async';

import 'package:amplify_flutter/amplify_flutter.dart';

final hubSubscription =
    Amplify.Hub.listen(HubChannel.Auth, (AuthHubEvent hubEvent) async {
  if (hubEvent.eventName == 'SIGNED_OUT') {
    try {
      await Amplify.DataStore.clear();
      safePrint('DataStore is cleared as the user has signed out.');
    } on DataStoreException catch (e) {
      safePrint('Failed to clear DataStore: $e');
    }
  }
});
```