new_contents: 
  from django.db import migrations
  
  
  def fix_level(apps, schema_editor):
      Level = apps.get_model('app', 'Level')
  
      levels = Level.objects.all()
  
      for l in levels:
          l.level_order = l.id
          l.save()
  
  
  class Migration(migrations.Migration):
      dependencies = [
          ('app', '0152_merge'),
      ]
  
      operations = [
          migrations.RunPython(fix_level),
      ]
  
subject: fix level order