how to create a role with no privileges?

[Kynn Jones <kynnjo@xxxxxxxxx>]

How does one define the most limited role/user possible in PostgreSQL?

Ideally, this role would not be able to do *anything* at all.  In particular, this role would not be able to query meta-information about existing tables, functions, etc. with backslash commands such as \dt, \df.

(Of course, in practice such a role would not correspond to any real role.  Its purpose, rather, is to serve as the starting point for defining more realistic roles by selectively adding the fewest privileges possible).

TIA for any pointers!

kynn