Have you used custom scripts for data migration in Django?

Yes, in Django, custom scripts are often used for data migration, especially when standard model migrations are insufficient for data transformation or transfer.

For example, you can create a custom management command or use RunPython in migrations to perform complex data operations:

from django.db import migrations

def migrate_data(apps, schema_editor):
    MyModel = apps.get_model('myapp', 'MyModel')
    for obj in MyModel.objects.all():
        obj.field = transform(obj.field)
        obj.save()

class Migration(migrations.Migration):
    dependencies = [
        ('myapp', '0001_initial'),
    ]

    operations = [
        migrations.RunPython(migrate_data),
    ]

This approach allows controlling data migration along with schema changes.