Extending the User model

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Hi,

I'm building a package for a friend. I made some entities with relations and I want to add a few relations to the User model.
For example. A User should have a OneToMany relation with a ticket.

What would be the best way to extend the user model programmaticly in my package so I can add these new relations?
The goal is to list these tickets in the user's profile.

Best regards,

Bleenders

bleenders