Backend management of gift cards

src/pretix/base/migrations/0135_auto_20190910_2020.py

@@ -21,7 +21,7 @@ class Migration(migrations.Migration):
                 ('issuance', models.DateTimeField(auto_now_add=True)),
                 ('secret', models.CharField(db_index=True, default=pretix.base.models.giftcards.gen_giftcard_secret, max_length=190, unique=True)),
                 ('currency', models.CharField(max_length=10)),
-                ('issued_in', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='issued_gift_cards', to='pretixbase.OrderPosition')),
+                ('issued_in', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='issued_gift_cards', to='pretixbase.OrderPosition', null=True, blank=True)),
                 ('issuer', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='issued_gift_cards', to='pretixbase.Organizer')),
             ],
         ),

src/pretix/base/migrations/0136_auto_20190918_1537.py

@@ -0,0 +1,29 @@
+# Generated by Django 2.2.1 on 2019-09-18 15:37
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+import pretix.base.models.fields
+
+
+def fwd(app, schema_editor):
+    Team = app.get_model('pretixbase', 'Team')
+    Team.objects.filter(can_change_organizer_settings=True).update(can_manage_gift_cards=True)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0135_auto_20190910_2020'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='team',
+            name='can_manage_gift_cards',
+            field=models.BooleanField(default=False),
+        ),
+        migrations.RunPython(
+            fwd, migrations.RunPython.noop
+        ),
+    ]