@Override
  @Nullable
  public String getCachedEventsScheme() {
    try {
      Path file = getEventsSchemeFile();
      if (Files.exists(file) && Files.isRegularFile(file)) {
        return Files.readString(file);
      }
    }
    catch (IOException e) {
      LOG.error(e);
    }
    return null;
  }
@Override
  @Nullable
  public String getCachedEventsScheme()