code: public static synchronized void updateTokens(InetAddress ep, Collection<Token> tokens)
      {
          if (ep.equals(FBUtilities.getBroadcastAddress()))
          {
              removeEndpoint(ep);
              return;
          }
  
          String req = "INSERT INTO system.%s (peer, tokens) VALUES (?, ?)";
          executeInternal(String.format(req, PEERS_CF), ep, tokensAsSet(tokens));
      }
docs: Record tokens being used by another node