ZPsycopgDA (in the Debian zope-psycopgda package) is a Zope Database
Adapter based on the psycopg Python/PostgreSQL driver. You'll find
more information and documentation in the pythonX.Y-psycopg package,
where X.Y is the version of your installed Python.

Details for ZPsycopgDA for Zope are found in the documentation of 
the python2.3-psycopg package.