postgres service

I added a postgresql service to the list of my services, like this (services (cons* (postgresql-service #:locale "it_IT.UTF-8") (gnome-desktop-service) (xfce-desktop-service) %desktop-services)) This is an excerpt of the "guix system reconfigure e

How important is /gnu/store/.links?

What is the purpose of /gnu/store/.links and is it important? I checked the docs on the website and couldn't find any reference to this directory anywhere, so I'm asking here.