allow blank values, stupid django

src/tickets/migrations/0021_auto_20210803_0521.py

@@ -0,0 +1,28 @@
+# Generated by Django 3.2.5 on 2021-08-03 05:21
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("tickets", "0020_populate_ticket_used_when"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="discountticket",
+            name="used_time",
+            field=models.DateTimeField(blank=True, null=True),
+        ),
+        migrations.AlterField(
+            model_name="shopticket",
+            name="used_time",
+            field=models.DateTimeField(blank=True, null=True),
+        ),
+        migrations.AlterField(
+            model_name="sponsorticket",
+            name="used_time",
+            field=models.DateTimeField(blank=True, null=True),
+        ),
+    ]

src/tickets/models.py

@@ -98,7 +98,7 @@ def qr_code_base64(token):
 class BaseTicket(CampRelatedModel, UUIDModel):
     ticket_type = models.ForeignKey("TicketType", on_delete=models.PROTECT)
     used = models.BooleanField(default=False)
-    used_time = models.DateTimeField(null=True)
+    used_time = models.DateTimeField(null=True, blank=True)
     badge_handed_out = models.BooleanField(default=False)
     token = models.CharField(max_length=64, blank=True)
     badge_token = models.CharField(max_length=64, blank=True)