Query hints & persistent cache for latest approvals (#5176)

src/Repository/Query/TimesheetQueryHint.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Repository\Query;
+
+enum TimesheetQueryHint
+{
+    case USER_PREFERENCES;
+    case CUSTOMER_META_FIELDS;
+    case PROJECT_META_FIELDS;
+    case ACTIVITY_META_FIELDS;
+}