saveUser method

@override Future<void> saveUser(RuutUser user)

Implementation

@override
Future<void> saveUser(RuutUser user) async {
  // Use a stable storage key even when identifier is null
  final storageKey = user.identifier ?? _clientInstanceKey;
  await _clientInstanceIdToUserIdentifierBox.put(
      _clientInstanceKey, storageKey);
  await _box.put(storageKey, user);
}