Add new tables to moodle database

I just want to know is it ok to add new tables to the moodle database or should I create a new database for that? I need a table to save a unique id and a token in one table and client's ip address, client's MAC address and computer name in another table.(and what are the best data types to store those?) And I just want to know does moodle save these things in there tables? Then it will be easy for me. Thank You