Bug: You can add multiple of the same CustomCharacter type

[BillTheBeast]

What doesn't work?

If you try to add a new CustomCharacter of a type (CharacterId) you already own, it allows you to do so.

What is the endpoint and method? (if applicable)

Endpoint: CustomCharacter/

Method: POST

How can it be reproduced?

1. Try to add new CustomCharacter to customCharacter/ endpoint while already having CustomCharacter with the same CharacterId.

What should it do instead?

Not add the Character and return an error that you already own this character type (409).

[MikhailDeriabin]

@BillTheBeast

Ok, I will try to fix that in this sprint