old_contents: from __future__ import unicode_literals
  
  import django.contrib.postgres.fields.jsonb
  from django.db import migrations, models
  import django.db.models.deletion
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('models', '3724_report_manager'),
      ]
  
      operations = [
          migrations.RunSQL(
              """
                  update graphs
                  set templateid = r.templateid, config = r.config
                  from reports r where r.graphid = graphs.graphid and r.active = true;
              """,
              ""
          ),
          migrations.DeleteModel(
              name='Report',
          ),
      ]
  
new_contents: from __future__ import unicode_literals
  
  import django.contrib.postgres.fields.jsonb
  from django.db import migrations, models
  import django.db.models.deletion
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('models', '3724_report_manager'),
      ]
  
      operations = [
          migrations.RunSQL(
              """
                  update reports
                  set config = '{}'::json
                  where config is NULL;
  
                  update graphs
                  set templateid = r.templateid, config = r.config
                  from reports r where r.graphid = graphs.graphid and r.active = true;
              """,
              ""
          ),
          migrations.DeleteModel(
              name='Report',
          ),
      ]
  
subject: fix for issue with report migration