Where can we add SQL for schema creation in Postgres?

I've got some database tables that exist in a separate Postgres schema called legacy. When using pytest-django to set up a test database, I get this error when it tries to apply the migrations:

django.db.utils.ProgrammingError: schema "legacy" does not exist

That makes good sense as it's just created a fresh test database and that schema, in fact, does not exist.

However, I'm really struggling to see where I can hook into pytest-django's ecosystem of fixtures in order to create the schema I need before the migrations are applied.

I've read some some other related issues, but haven't come across a definitive answer.

I tried adding an autouse fixture in conftest.py, but I think it would run too late in the process, and so my test run ends with the error above.

import pytest
from django.db import connection

@pytest.fixture(scope='session')
def legacy_schema(django_db_setup, django_db_blocker):
    # https://docs.djangoproject.com/en/3.1/topics/db/sql/#executing-custom-sql-directly
    with django_db_blocker.unblock():
        with connection.cursor() as cursor:
            cursor.execute('CREATE SCHEMA legacy;')

Can anyone point me in the right direction? Or if this is genuinely impossible with pytest-django, let me know so I can pick a different test runner.

Start by reading the django_db_setup and django_db_blocker fixtures discussed in the issue, then review the three linked issues for existing guidance on database setup timing. Determine whether pytest-django needs a documented hook or a code change to create the legacy schema before migrations; done means a clear supported path or a confirmed limitation.