new_contents: # Generated by Django 3.1.13 on 2021-07-21 15:40
  
  from django.db import migrations, models
  import django.db.models.deletion
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('authent', '0005_remove_userprofile_language'),
          ('infrastructure', '0024_auto_20210716_1043'),
      ]
  
      operations = [
          migrations.AlterField(
              model_name='infrastructure',
              name='maintenance_difficulty',
              field=models.ForeignKey(blank=True, help_text="Danger level of maintenance agents' interventions on infrastructure", null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='infrastructures_set', to='infrastructure.infrastructuremaintenancedifficultylevel', verbose_name='Maintenance difficulty'),
          ),
          migrations.AlterField(
              model_name='infrastructure',
              name='usage_difficulty',
              field=models.ForeignKey(blank=True, help_text="Danger level of end users' infrastructure usage", null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='infrastructures_set', to='infrastructure.infrastructureusagedifficultylevel', verbose_name='Usage difficulty'),
          ),
          migrations.AlterField(
              model_name='infrastructureusagedifficultylevel',
              name='label',
              field=models.CharField(max_length=250, unique=True, verbose_name='Label'),
          ),
          migrations.AlterUniqueTogether(
              name='infrastructuremaintenancedifficultylevel',
              unique_together={('label', 'structure')},
          ),
          migrations.AlterUniqueTogether(
              name='infrastructureusagedifficultylevel',
              unique_together={('label', 'structure')},
          ),
      ]
  
subject: Add migration for infrastructure model