new_contents: # Generated by Django 2.2.6 on 2019-10-15 19:22
  
  from django.db import migrations, models
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('typeclasses', '0012_attrs_to_picklev4_may_be_slow'),
      ]
  
      operations = [
          migrations.AlterField(
              model_name='tag',
              name='db_tagtype',
              field=models.CharField(blank=True, db_index=True, help_text='overall type of Tag', max_length=16, null=True, verbose_name='tagtype'),
          ),
      ]
  
subject: add migration file