text: # Generated by Django 3.1a1 on 2020-07-07 09:20
  
  import datetime
  from django.db import migrations, models
  from django.utils.timezone import utc
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('references', '0001_initial'),
      ]
  
      operations = [
          migrations.RemoveField(
              model_name='publication',
              name='url',
          ),
          migrations.AddField(
              model_name='publication',
              name='inspirehep_id',
              field=models.IntegerField(default=0, help_text='Insprie HEP id (inspirehep.net/literature/{id}).', unique=True),
              preserve_default=False,
          ),
          migrations.AddField(
              model_name='publication',
              name='preprint_date',
              field=models.DateField(default=datetime.datetime(2020, 7, 7, 9, 20, 30, 236698, tzinfo=utc), help_text='Date preprint got uploaded.'),
              preserve_default=False,
          ),
          migrations.AlterField(
              model_name='publication',
              name='arxiv_id',
              field=models.CharField(help_text="Arxiv qualifier like '2000.01234'.", max_length=20, unique=True),
          ),
      ]
  