After wrestling with optimizing the performance of large zone tables, I've decided to exclude domain redirects from the default.
While these are real zones which require administration, they aren't as high a priority, nor do they get edited as often.
In the new method of managing the list of zones via an actual zonefile, I'll set the categories or tags of zones with the ttl parameter, possibly using an id to category or tag mapping. The only limitation I can think of at the moment is the inability to assign multiple categories to each zone, though there could be some sort of encoding or mapping that goes on.
I'd really like to keep things simple, but flexible. Should a zone's categories or tags require an extra query?
