Add more features to custom meta properties (#1922)

src/pretix/base/migrations/0176_auto_20210205_1512.py

@@ -0,0 +1,28 @@
+# Generated by Django 3.0.11 on 2021-02-05 15:12
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0175_orderrefund_comment'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='eventmetaproperty',
+            name='allowed_values',
+            field=models.TextField(null=True),
+        ),
+        migrations.AddField(
+            model_name='eventmetaproperty',
+            name='protected',
+            field=models.BooleanField(default=False),
+        ),
+        migrations.AddField(
+            model_name='eventmetaproperty',
+            name='required',
+            field=models.BooleanField(default=False),
+        ),
+    ]