feat(tests): use unlogged tables with PostgreSQL

This seems to somewhat improve testsuite performance.

weblate/settings_test.py

@@ -29,7 +29,7 @@
         "isolation_level": "read committed",
     }
 elif CI_DATABASE == "postgresql":
-    DATABASES["default"]["ENGINE"] = "django.db.backends.postgresql"
+    DATABASES["default"]["ENGINE"] = "weblate.utils.postgres_unlogged"
     default_user = "postgres"
 else:
     if not CI_DATABASE:

weblate/utils/postgres_unlogged/base.py

@@ -0,0 +1,12 @@
+# Copyright © Michal Čihař <michal@weblate.org>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.db.backends.postgresql.base import *  # noqa: F403
+from django.db.backends.postgresql.base import DatabaseWrapper as OrigDatabaseWrapper
+
+from .schema import DatabaseSchemaEditor
+
+
+class DatabaseWrapper(OrigDatabaseWrapper):  # type: ignore [no-redef]
+    SchemaEditorClass = DatabaseSchemaEditor

weblate/utils/postgres_unlogged/schema.py

@@ -0,0 +1,14 @@
+# Copyright © Michal Čihař <michal@weblate.org>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.db.backends.postgresql.schema import (
+    DatabaseSchemaEditor as OrigDatabaseSchemaEditorg,
+)
+
+
+class DatabaseSchemaEditor(OrigDatabaseSchemaEditorg):
+    sql_create_table = OrigDatabaseSchemaEditorg.sql_create_table.replace(
+        "CREATE TABLE ",
+        "CREATE UNLOGGED TABLE ",
+    )