Correct db migration for trashbin feature

dav_registration/migrations/0006_auto_20201203_1144.py

@@ -27,9 +27,10 @@ class Migration(migrations.Migration):
                 'ordering': ['updated_at'],
             },
         ),
-        migrations.RemoveField(
+        migrations.RenameField(
             model_name='registration',
-            name='answered',
+            old_name='answered',
+            new_name='answered_2migrate',
         ),
         migrations.AddField(
             model_name='registrationstatus',

dav_registration/models.py

@@ -72,6 +72,8 @@ class Registration(models.Model):
                                                   verbose_name=_('Einwilligung zur Datenspeicherung'))
     purge_at = models.DateTimeField(_('Zeitpunkt der Datenlöschung'))
 
+    answered_2migrate = models.BooleanField(default=False, verbose_name=_('Durch Tourleitung beantwortet'))
+
     @staticmethod
     def pk2hexstr(pk):
         return hex(pk * 113)[2:]  # 113 has no meaning, but it produce nice looking hex codes.