perf: add new index to server a full WHERE clause

Signed-off-by: Anna Larch <anna@nextcloud.com>

Author: miaulalala

lib/Migration/Version2012Date20260309120000.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Activity\Migration;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+class Version2012Date20260309120000 extends SimpleMigrationStep {
+	#[\Override]
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		$table = $schema->getTable('activity');
+
+		if (!$table->hasIndex('activity_object_user')) {
+			$table->addIndex(['affecteduser', 'object_type', 'object_id', 'timestamp'], 'activity_object_user');
+		}
+
+		return $schema;
+	}
+}