Add organization and team models

[cutwater]

• Add new Oranization and Team models, that implement respective abstract models from DAB.
• Add related database migrations and data migration, that creates a new default model.
• Implement custom manager for the Organization model that retrieves the default organization.

No-Issue

[newswangerd]

I'd recommend using the get_user_model() function that django provides for this.

[cutwater]

I don't think it's the case here and actually Django documentation explicitly states to use settings.AUTH_USER_MODEL in foreign keys.

https://docs.djangoproject.com/en/5.0/topics/auth/customizing/

When you define a foreign key or many-to-many relations to the user model, you should specify the custom model using the AUTH_USER_MODEL setting.

However there is vague statement, that get_user_model may be used instead, though it is not obvious which benefits it gives in this specific case.

Generally speaking, it’s easiest to refer to the user model with the AUTH_USER_MODEL setting in code that’s executed at import time, however, it’s also possible to call get_user_model() while Django is importing models, so you could use models.ForeignKey(get_user_model(), ...).

The get_user_model() function call is useful where you need to use a model instance, not a string. For instance to make a query:

User = get_user_model()
User.objects.get(...)