text: from django.db import models, migrations
  
  
  class Migration(migrations.Migration):
      dependencies = [
          ('metadata', '0001_initial'),
      ]
  
      operations = [
          migrations.AlterField(
              model_name='metadatatype',
              name='validation',
              field=models.CharField(
                  blank=True, max_length=64,
                  verbose_name='Validation function name',
                  choices=[
                      (
                          b'metadata.validators.DateAndTimeValidator',
                          b'metadata.validators.DateAndTimeValidator'
                      ),
                      (
                          b'metadata.validators.DateValidator',
                          b'metadata.validators.DateValidator'
                      ),
                      (
                          b'metadata.validators.TimeValidator',
                          b'metadata.validators.TimeValidator'
                      )
                  ]
              ),
              preserve_default=True,
          ),
      ]
  