Using wp_term_relationships table for new object

Question

I need to create a table to store data about campaigns (name, status, and other info). These campaigns will be associated to one or more wp categories.

I thought that this association could be done in the wp_terms_relationships table but if i try to get a campaign's categories from wp_terms_relationships i think i can get also the post categories (if it has the same id than the campaign).

Is there a way to associate a new object with a taxonomy in wp_terms_relationships table?

Thanks