If you are talking about the configs of the device taken by CatTools, Here is the answer,
1.CatTools is not keeping the configs in Database but as a text file in the chosen folder (By default 'configs' folder)
2.When there is a new3 config of the same device, then the old config will be moved with date suffix to 'Dated configs folder'
3.If you want to keep a minimum number of files, just configure an activity type 'System.File.Delete' and choose your preference under options tab.
Thanks for your answer Nanda!