code: func (a *Agent) purgeProxy(proxyID string) error {
  	proxyPath := filepath.Join(a.config.DataDir, proxyDir, stringHash(proxyID))
  	if _, err := os.Stat(proxyPath); err == nil {
  		return os.Remove(proxyPath)
  	}
  	return nil
  }
docs: // purgeProxy removes a persisted proxy definition file from the data dir