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restrictions on dns_cnames

RT-179660

  1. fromname, toname are varchar(63). They probably ought to just be e.g. varchar, with two constraints:

a) any label is no more than 63 characters

b) the entire length is no more than (I think) 253 chars NB arguably there should be constraints on similar fields in other tables, e.g. dns_domains.name; subnet.domain_name.

  1. dns_cnames.dns_domain_id is currently nullable. I think it probably ought to be not null.