Move db stats to separate classes for each db type

Project......: Performance Profiling
Sponsored-by.: NLnet NGI0 Commons Fund

tests/unit/Lib/DbStatsTest.php

@@ -0,0 +1,41 @@
+<?php
+/* Test cases for DbStats
+ *
+ * SPDX-FileCopyrightText: 2026 The Hubzilla Community
+ * SPDX-FileContributor: Harald Eilertsen <haraldei@anduin.net>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+namespace Zotlabs\Tests\Unit\Lib;
+
+use DBA;
+use Zotlabs\Lib\DbStats;
+use Zotlabs\Tests\Unit\UnitTestCase;
+
+class DbStatsTest extends UnitTestCase
+{
+	public function testGetQueries(): void {
+		$stats = DbStats::getStats();
+		$this->assertNotNull($stats);
+		$this->assertInstanceOf(DbStats::class, $stats);
+
+		$numQueries = $stats->getQueries();
+		$this->assertNotEquals(0, $numQueries);
+
+		if (!DBA::$dba->is_postgres()) {
+			//
+			// Postgres will only update the stats once the transaction
+			// is committed or rolled back. As we wrap the tests in a
+			// transaction to begin with, the stats won't change here,
+			// so we skip this test on Postgres.
+			//
+			dbq("select * from account");
+			dbq("select * from channel");
+			dbq("select * from xchan");
+
+			$numMoreQueries = $stats->getQueries();
+			$this->assertGreaterThan($numQueries, $numMoreQueries);
+		}
+	}
+}