Use for denormalized fields

[pgcd]

I planned on using this (awesome) library to cleanup some of my code and avoid some problems caused by denormalizing fields in app code, but I haven't been able to find any clear examples of doing it.
Is there any such example or are you possibly even thinking about a new Trigger class?

Update: I can imagine that #82 might be relevant, but I'm not sure it's exactly the same thing, hence the new issue.

[pgcd]

Closing in favor of #26