Default isolation level for transaction (@atomic) with Django and PostgreSQL

From the docs:

Like PostgreSQL itself, Django defaults to the READ COMMITTED isolation level.

Django can be configured using the database settings like this:

import psycopg2.extensions

DATABASES = {
    # ...
    'OPTIONS': {
        'isolation_level': psycopg2.extensions.ISOLATION_LEVEL_SERIALIZABLE,
    },
}

Documentation - https://docs.djangoproject.com/en/2.2/ref/databases/#isolation-level