Package metadata (was: Beyond QA: Uploaders field hygiene)

Which reminds me of an old idea somebody had decades ago: Having a
metadata database (sorry for the pleonasm, if it is one) in addition to
the fields in the package itself. That way updates of maintainer,
uploader, upstream homepage, etc. would not *require* a package upload.
At least on online services, such as tracker.d.o, the updated data would
be shown. Less CO₁ btw.! Technically, data could be taken from VCS, as
long as the VCS fields don't change.

(That would not change anything Tobi wrote, regarding hygiene.)