text: from django.db import migrations, models, transaction
  
  
  def operation_remove_duplicates(apps, schema_editor):
      StoredDriver = apps.get_model(
          app_label='file_metadata', model_name='StoredDriver'
      )
      DocumentVersionDriverEntry = apps.get_model(
          app_label='file_metadata', model_name='DocumentVersionDriverEntry'
      )
  
      driver = StoredDriver.objects.first()
      if driver:
          with transaction.atomic():
              for driver_entry in DocumentVersionDriverEntry.objects.using(alias=schema_editor.connection.alias).all():
                  driver_entry.driver = driver
                  driver_entry.save()
  
              StoredDriver.objects.exclude(pk=driver.id).delete()
  
  
  class Migration(migrations.Migration):
      atomic = False
      dependencies = [
          ('file_metadata', '0002_documenttypesettings'),
      ]
      operations = [
          migrations.RunPython(
              code=operation_remove_duplicates,
              reverse_code=migrations.RunPython.noop,
          ),
          migrations.AlterField(
              model_name='storeddriver',
              name='driver_path',
              field=models.CharField(
                  max_length=255, unique=True, verbose_name='Driver path'
              ),
          ),
          migrations.AlterField(
              model_name='storeddriver',
              name='internal_name',
              field=models.CharField(
                  db_index=True, max_length=128, unique=True,
                  verbose_name='Internal name'
              ),
          ),
  
      ]
  