New column modifier?

I am wondering about useful something might be. So I hope ya'll don't mind
me throwing out for feedback. I am fairly good with standard SQL, but not
the more advanced DBA things such as TRIGGERs. I am reading good book,
"PostgreSQL Server Programming" to increase my knowledge. The section that
I'm on now is about triggers. And how to use them to enforce a "read only"
column. So I'm wondering if such is very common? I can see some uses for it
with things which "should not change", such as a system generated date/time
in an audit log. Given how much PostgreSQL extends beyond the ANSI
standard, I'm wondering if a new column modifier, perhaps "WORM" (Write
Once, Read Many) might be of any real use. Or is this "need" just not
prevalent enough to require such a thing?

just thinking. But maybe not productively.

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John McKown