c3lf-system-3/core/authentication/migrations/0004_legacy_user.py

from django.conf import settings
from django.db import migrations


class Migration(migrations.Migration):
    dependencies = [
        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
        ('authentication', '0003_groups'),
    ]

    def create_legacy_user(apps, schema_editor):
        ExtendedUser = apps.get_model('authentication', 'ExtendedUser')
        ExtendedUser.objects.create_user(settings.LEGACY_USER_NAME, 'mail@' + settings.MAIL_DOMAIN,
                                         settings.LEGACY_USER_PASSWORD)

    operations = [
        migrations.RunPython(create_legacy_user)
    ]