Migrate from AutoField to BigAutoField (#3493)

src/pretix/plugins/sendmail/migrations/0007_bigint.py

@@ -0,0 +1,23 @@
+# Generated by Django 4.2.4 on 2023-09-26 12:01
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pretixbase", "0246_bigint"),
+        ("sendmail", "0006_rule_subevent_alter_rule_checked_in_status"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="rule",
+            name="subevent",
+            field=models.ForeignKey(
+                null=True,
+                on_delete=django.db.models.deletion.PROTECT,
+                to="pretixbase.subevent",
+            ),
+        ),
+    ]