Hi @Aliaksandr_Smirnou. I wasn’t able to view your loopbacks, but I just followed-up a post of mine where I try to explain some of my own experience setting up my Fibery and getting a feel for the approach to the structure:
It’s rather long, but I thought it might help you understand some basics around how to think about relations, and where your entities should be set up.
I wish you luck in your implementation! I am eager to hear more from fellow first adopters of this great tool!