docs: def ReadClientCrashInfo(self, client_id):
      """Reads the latest client crash record for a single client."""
      history = self.crash_history.get(client_id, None)
      if not history:
        return None
  
      ts = max(history)
      res = rdf_client.ClientCrash.FromSerializedString(history[ts])
      res.timestamp = ts
      return res