How to specify a database for saving a model?

Question

Django

There are 2 sites. Each of them has 2 databases for itself and there is another common one. There is only one table in total.
In the settings of each site, I specified a second base in addition to default:

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    },
    'registrations': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': '../db.sqlite3'
    }
}

In the models of one of the sites, I made a test model for a common table, in the future I plan to import it into the second site:

class Registration(models.Model):
    aa = models.CharField('fdg', name="fddf", max_length=10)

    def __str__(self):
        return self.aa

Actually, the question is: how to specify the database in the model for saving from the admin panel? It's from the admin.

Answer 1

Routing register https://docs.djangoproject.com/en/3.2/topics/db/mu...