Help, I can't make a delegation !!!

Hi list, I have the following definition for dns_records:

 

dns_zone   |text    |

host       |text    |

ttl        |integer |

dns_type   |text    |

mx_priority|integer |

data       |text    |

 
And here you can see some data:

dns_zone    |host       |ttl   |dns_type |mx_priority |data         |

example.com |@          |604800|soa      |null        |tip-server reynerhl.gmail.com. 20090408 3000 900 108864000 432000|

example.com |@          |604800|ns       |null        |tip-server   |

example.com |tip-server |604800|a        |null        |10.7.20.3    |

 

Here you can see my queries, they are very simple:

dlz "postgres zone" {

database "postgres 2

{host=/var/run/postgresql dbname=dlz user=rey }

{select dns_zone from dns_records where dns_zone= '%zone%' limit 1}

{

SELECT ttl, dns_type, mx_priority, data

FROM dns_records WHERE dns_zone = '%zone%' AND host='%record%';

}";

};

 

If I have the subdomain us.example.com working in the machine with ip address 10.7.20.2, What records should I make to the parent (example.com in 10.7.20.3) to ensure the delegation?

Thanks for your time.

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