mckoidb access and user record problem

I have two questions/problems. The root problem is that I have installed the Antclick package on my NT server (pre2 release) and a user somehow got their account added twice to the database with the same user ID. Now that ID is not editable or deletable. The error thrown when I try to delete that account is:

An error occurred while processing your request:

java.lang.RuntimeException: Error retrieving Node: java.lang.RuntimeException: More than one value returned by query.

So I'm thinking I need to manually go into the Mckoi dabatase and delete that record. Does anyone know how I can query the DB directly? And secondly does anyone know the default schema used by the ANTClick install?