Reduced version without schema change and DB migration

src/pretix/base/migrations/0299_fixup_eventmetaproperties.py

@@ -1,81 +0,0 @@
-# Generated by Django 5.2.12 on 2026-04-28 11:34
-import logging
-
-from django.db import IntegrityError, migrations, transaction
-from django.db.models import Count, F
-
-logger = logging.getLogger(__name__)
-
-
-def fix_cross_organizer_eventmetavalues(apps, schema_editor):
-    EventMetaProperty = apps.get_model("pretixbase", "EventMetaProperty")
-    EventMetaValue = apps.get_model("pretixbase", "EventMetaValue")
-
-    cross_org_values = EventMetaValue.objects.filter(event__organizer__pk__ne=F('property__organizer__pk'))
-    for emv in cross_org_values:
-        logger.info(f"Fixup cross-organizer value {emv.event.organizer.slug}/{emv.event.slug}\n  before: {emv.property.name}({emv.property.id}@{emv.property.organizer.slug}) = {emv.value}")
-        try:
-            emv.property = emv.event.organizer.meta_properties.filter(name=emv.property.name).first()
-            logger.info(f"  found existing EventMetaProperty in {emv.event.organizer.slug}")
-            if EventMetaValue.objects.filter(event=emv.event, property=emv.property).exists():
-                logger.info(f"  EventMetaValue with property in correct organizer already exists, deleting the cross-organizer one")
-                emv.delete()
-                continue
-        except EventMetaProperty.DoesNotExist:
-            meta_prop = emv.property
-            meta_prop.pk = None
-            meta_prop.organizer = emv.event.organizer
-            meta_prop.save(force_insert=True)
-            logger.info(f"  created new EventMetaProperty")
-            emv.property = meta_prop
-        logger.info(f"  after: {emv.property.name}({emv.property.id}@{emv.property.organizer.slug}) = {emv.value}")
-        emv.save(update_fields=["property"])
-
-
-def make_eventmetaproperties_unique(apps, schema_editor):
-    EventMetaProperty = apps.get_model("pretixbase", "EventMetaProperty")
-    EventMetaValue = apps.get_model("pretixbase", "EventMetaValue")
-
-    duplicates = EventMetaProperty.objects.values('organizer', 'organizer__slug', 'name').annotate(count=Count('id')).filter(count__gt=1)
-    for dup in duplicates:
-        logger.info(f"Fixup duplicate property {dup['organizer__slug']} {dup['name']}")
-        props = list(EventMetaProperty.objects.filter(organizer=dup['organizer'], name=dup['name']))
-
-        # TODO: any better idea than picking the property to keep more or less randomly (first in database order)?
-        target = props[0]
-        invalid = props[1:]
-
-        try:
-            with transaction.atomic():
-                affected = EventMetaValue.objects.filter(
-                    event__organizer=dup['organizer'], property__in=invalid
-                ).update(
-                    property=target
-                )
-                logger.info(f"  Switching {affected} value(s) over to {target.name}({target.id}@{target.organizer.slug})")
-
-        except IntegrityError as e:
-            logger.info(f"  Failed to switch all value(s) over to {target.name}({target.id}@{target.organizer.slug})")
-            logger.info(f"  {e}")
-            for prop in invalid:
-                newname = f'{prop.name}_DUPLICATE_{prop.id}'
-                logger.info(f"  Renaming {prop.name}({prop.id}@{prop.organizer.slug}) to {newname}({prop.id}@{prop.organizer.slug})")
-                prop.name = newname
-                prop.save()
-
-        else:
-            for prop in invalid:
-                logger.info(f"  Deleting {prop.name}({prop.id}@{prop.organizer.slug})")
-                prop.delete()
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ("pretixbase", "0298_pluggable_permissions"),
-    ]
-
-    operations = [
-        migrations.RunPython(fix_cross_organizer_eventmetavalues, migrations.RunPython.noop),
-        migrations.RunPython(make_eventmetaproperties_unique, migrations.RunPython.noop),
-    ]

src/pretix/base/migrations/0300_alter_eventmetaproperty_unique_together.py

@@ -1,17 +0,0 @@
-# Generated by Django 5.2.12 on 2026-04-28 11:34
-
-from django.db import migrations
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ("pretixbase", "0299_fixup_eventmetaproperties"),
-    ]
-
-    operations = [
-        migrations.AlterUniqueTogether(
-            name="eventmetaproperty",
-            unique_together={("organizer", "name")},
-        ),
-    ]

src/pretix/base/models/event.py

@@ -1847,7 +1847,6 @@ class EventMetaProperty(LoggedModel):
 
     class Meta:
         ordering = ("position", "name",)
-        unique_together = ('organizer', 'name')
 
     @property
     def choice_keys(self):