Add several administration tools

tools/monitor_login.php

@@ -0,0 +1,23 @@
+<?php
+/**
+ * This script is used to monitor the last login times of specific email addresses.
+ * It checks the last login time of each monitored email address and compares it with the last recorded login time in the `monitored_mailboxes` table.
+ * If a new login is detected, it updates the last login time in the database and sends a notification email to the specified recipients.
+ */
+const NOTIFICATION_EMAIL = 'police@example.com';
+const MONITOR_MAILS = ['criminal@danwin1210.de', 'another_criminal@danwin1210.de'];
+require_once __DIR__ . '/../common_config.php';
+$db = get_db_instance();
+$stmt = $db->prepare( "SELECT `m`.`last_login` FROM `mailbox` AS m LEFT JOIN `monitored_mailboxes` AS `mon` ON (`m`.`username`=`mon`.`username`) WHERE `m`.`username` = ? AND (ISNULL(`mon`.`last_login`) OR `mon`.`last_login` < `m`.`last_login`);" );
+$update = $db->prepare( "INSERT INTO `monitored_mailboxes` (`username`, `last_login`) VALUES(?, ?) ON DUPLICATE KEY UPDATE `last_login` = ?;" );
+$changed = '';
+foreach(MONITOR_MAILS as $mail){
+	$stmt->execute([$mail]);
+	if($result = $stmt->fetch(PDO::FETCH_ASSOC)){
+		$update->execute([$mail, $result['last_login'], $result['last_login']]);
+		$changed .= $mail . ' -> ' . date('Y-m-d H:i:s', $result['last_login']) . ' UTC' . PHP_EOL;
+	}
+}
+if(!empty($changed)){
+	mail(NOTIFICATION_EMAIL, 'User logged in', $changed."\n\n");
+}