Monitoring object usage?

Hi,

I'm trying to get a grip on a new body of code and a Postgres database that
I'm working with. In particular I've been tasked with cleaning up the
database.

Is there a way in Postgres to enable monitoring on tables and columns to
determine what's not actively being used?

This would then form input for a more thorough check into the code base to
see what's really not being used.


Thanks & cheers,

Colin