old_contents: from django.db import migrations, models
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ("wagtailembeds", "0007_populate_hash"),
      ]
  
      operations = [
          migrations.AlterField(
              model_name="embed",
              name="hash",
              field=models.CharField(db_index=True, max_length=32, unique=True),
          ),
          # MySQL needs max length on the unique together fields.
          # Drop unique together before alter char to text.
          migrations.AlterUniqueTogether(
              name="embed",
              unique_together=set(),
          ),
          migrations.AlterField(
              model_name="embed",
              name="url",
              field=models.TextField(),
          ),
          # Converting URLField to TextField with a default specified (even with preserve_default=False)
          # fails with Django 3.0 and MySQL >=8.0.13 (see https://code.djangoproject.com/ticket/32503) -
          # work around this by altering in two stages, first making the URLField non-null then converting
          # to TextField
          migrations.AlterField(
              model_name="embed",
              name="thumbnail_url",
              field=models.URLField(
                  blank=True,
                  default="",
              ),
              preserve_default=False,
          ),
          migrations.AlterField(
              model_name="embed",
              name="thumbnail_url",
              field=models.TextField(
                  blank=True,
              ),
          ),
      ]
  
new_contents: from django.db import migrations, models
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ("wagtailembeds", "0007_populate_hash"),
      ]
  
      operations = [
          migrations.AlterField(
              model_name="embed",
              name="hash",
              field=models.CharField(db_index=True, max_length=32, unique=True),
          ),
          # MySQL needs max length on the unique together fields.
          # Drop unique together before alter char to text.
          migrations.AlterUniqueTogether(
              name="embed",
              unique_together=set(),
          ),
          migrations.AlterField(
              model_name="embed",
              name="url",
              field=models.TextField(),
          ),
          # Converting URLField to TextField with a default specified (even with preserve_default=False)
          # fails with Django 3.0 and MySQL >=8.0.13 (see https://code.djangoproject.com/ticket/32503) -
          # work around this by altering in two stages, first making the URLField non-null then converting
          # to TextField
          migrations.AlterField(
              model_name="embed",
              name="thumbnail_url",
              field=models.URLField(
                  blank=True,
                  default="",
                  max_length=255,
              ),
              preserve_default=False,
          ),
          migrations.AlterField(
              model_name="embed",
              name="thumbnail_url",
              field=models.TextField(
                  blank=True,
              ),
          ),
      ]
  
subject: Add missing max_length on temporary thumbnail_url migration