Suggested way of associating PG user metadata with record

Hello,

I'd like to associate the PG user who created certain sorts of records
with that record in my application. The obvious way to do this is by
creating a text column with a default value of current_user in the
record's table, or perhaps something similar with a trigger. However,
because what I've described strikes me as a fairly common requirement,
I suspect there may be a purpose-built, more direct and efficient
feature I could use, such as a referential user datatype or something
like that.

Is there? If not, does the obvious approach seem reasonable?

Regards,
Peter Geoghegan