Devices: Store timestamp of last contact (#6453)

src/pretix/helpers/database.py

@@ -22,6 +22,7 @@
 import contextlib
 
 from django.conf import settings
+from django.contrib.postgres.indexes import BrinIndex
 from django.core.exceptions import FieldDoesNotExist, ImproperlyConfigured
 from django.db import connection, transaction
 from django.db.models import (
@@ -285,3 +286,21 @@ def get_deterministic_ordering(model, ordering):
             # on the primary key to provide total ordering.
             ordering.append("-pk")
     return ordering
+
+
+class IgnoreOnSQLiteMixin:
+    # Mixin to allow defining PostgreSQL-specific indexes that will just not be created
+    # on SQLite. SQLite is supported for testing only anyways!
+    def create_sql(self, model, schema_editor, *args, **kwargs):
+        if "sqlite" in settings.DATABASES["default"]["ENGINE"]:
+            return ""
+        return super().create_sql(model, schema_editor, *args, **kwargs)
+
+    def remove_sql(self, model, schema_editor, **kwargs):
+        if "sqlite" in settings.DATABASES["default"]["ENGINE"]:
+            return ""
+        return super().remove_sql(model, schema_editor, **kwargs)
+
+
+class BrinIndexIgnoredOnSQLite(IgnoreOnSQLiteMixin, BrinIndex):
+    pass