@Override
  public ExternalProjectInfo copy() {
    InternalExternalProjectInfo copy = new InternalExternalProjectInfo(
      projectSystemId,
      externalProjectPath,
      externalProjectStructure != null ? externalProjectStructure.graphCopy() : null
    );
    copy.setLastImportTimestamp(lastImportTimestamp);
    copy.setLastSuccessfulImportTimestamp(lastSuccessfulImportTimestamp);
    return copy;
  }
@Override
  public ExternalProjectInfo copy()