Manipulating cake_sessions table

I want to be sure that a user account is only in use by a single user at any one time. My thought was to add a user_id column to the cake_sessions table, then on log in check to see if the current user's id is stored against any records that don't match the current session id. I delete all those records which effectively logs any other user's logged in with 'this' account. I then store the current user's id against the current session.

I had this working in 1.3 by using $Session = ClassRegistry::getObject(Configure::read('Session.model')); and then using the $Session object to query, delete and update records. It fails in 2.3. I have tried to create a new model with $useTable = 'cake_sessions' but doing a find of any type returns an empty array.

Is anyone else doing anything similar or has any pointers please?

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