diff --git a/runtime/cleanup-missing-webdav-images.php b/runtime/cleanup-missing-webdav-images.php
new file mode 100644
index 0000000..25c71d2
--- /dev/null
+++ b/runtime/cleanup-missing-webdav-images.php
@@ -0,0 +1,124 @@
+#!/usr/bin/env php
+<?php
+if (PHP_SAPI !== 'cli')
+{
+  fwrite(STDERR, "CLI only\n");
+  exit(1);
+}
+
+$options = getopt('', array('piwigo-root:', 'connection-id:'));
+$piwigo_root = rtrim((string)($options['piwigo-root'] ?? ''), '/');
+$connection_id = (int)($options['connection-id'] ?? 0);
+if ($piwigo_root === '' || $connection_id < 1)
+{
+  fwrite(STDERR, "Parameter --piwigo-root und --connection-id werden benoetigt.\n");
+  exit(1);
+}
+
+$db_config = $piwigo_root.'/local/config/database.inc.php';
+if (!is_readable($db_config))
+{
+  fwrite(STDERR, "Piwigo-Datenbankkonfiguration ist nicht lesbar.\n");
+  exit(1);
+}
+
+$conf = array();
+$prefixeTable = 'piwigo_';
+require $db_config;
+foreach (array('db_host','db_user','db_password','db_base') as $key)
+{
+  if (!isset($conf[$key]))
+  {
+    fwrite(STDERR, "Piwigo-Datenbankkonfiguration ist unvollstaendig: $key\n");
+    exit(1);
+  }
+}
+
+$db = new mysqli($conf['db_host'], $conf['db_user'], $conf['db_password'], $conf['db_base']);
+if ($db->connect_errno)
+{
+  fwrite(STDERR, "Piwigo-Datenbank ist nicht erreichbar: ".$db->connect_error."\n");
+  exit(1);
+}
+$db->set_charset('utf8mb4');
+
+$table = $prefixeTable.'bratonien_tools_nc_connections';
+$result = $db->query('SELECT config_json FROM `'.$table.'` WHERE id='.$connection_id.' LIMIT 1');
+if (!$result || !$result->num_rows)
+{
+  fwrite(STDERR, "Connector-Verbindung #$connection_id wurde nicht gefunden.\n");
+  exit(1);
+}
+$config = json_decode((string)$result->fetch_assoc()['config_json'], true);
+if (!is_array($config) || (string)($config['source_mode'] ?? '') !== 'webdav-placeholder')
+{
+  echo "Keine WebDAV-Bereinigung erforderlich.\n";
+  exit(0);
+}
+
+$gallery_root = rtrim((string)($config['parallel_gallery_root'] ?? ''), '/');
+if ($gallery_root === '' || strpos($gallery_root, $piwigo_root.'/') !== 0)
+{
+  fwrite(STDERR, "Verbindungseigene Gallery-Root ist ungueltig.\n");
+  exit(1);
+}
+
+$relative = ltrim(substr($gallery_root, strlen($piwigo_root)), '/');
+$db_prefix = './'.rtrim($relative, '/').'/';
+$escaped_prefix = $db->real_escape_string(addcslashes($db_prefix, "_%\\"));
+$images_table = $prefixeTable.'images';
+$query = "SELECT id, path FROM `{$images_table}` WHERE path LIKE '{$escaped_prefix}%' ESCAPE '\\\\'";
+$rows = $db->query($query);
+if (!$rows)
+{
+  fwrite(STDERR, "Connector-Bilder konnten nicht gelesen werden: ".$db->error."\n");
+  exit(1);
+}
+
+$missing_ids = array();
+while ($row = $rows->fetch_assoc())
+{
+  $path = (string)$row['path'];
+  if (strpos($path, $db_prefix) !== 0)
+  {
+    continue;
+  }
+
+  $absolute = $piwigo_root.'/'.ltrim(preg_replace('#^\\./#', '', $path), '/');
+  if (!is_file($absolute))
+  {
+    $missing_ids[] = (int)$row['id'];
+  }
+}
+$db->close();
+
+if (!$missing_ids)
+{
+  echo "WebDAV-Bereinigung: keine fehlenden Piwigo-Bilder.\n";
+  exit(0);
+}
+
+// Erst jetzt Piwigo bootstrappen. Dieser Prozess wird nur nach einem erfolgreich
+// abgeschlossenen WebDAV-Abruf gestartet. Eine nicht erreichbare Verbindung kann
+// daher niemals ueber diesen Pfad Bilder loeschen.
+define('PHPWG_ROOT_PATH', $piwigo_root.'/');
+$_SERVER['REMOTE_ADDR'] = '127.0.0.1';
+$_SERVER['SERVER_ADDR'] = '127.0.0.1';
+$_SERVER['SERVER_NAME'] = 'localhost';
+$_SERVER['HTTP_HOST'] = 'localhost';
+$_SERVER['SERVER_PORT'] = '80';
+$_SERVER['REQUEST_METHOD'] = 'GET';
+$_SERVER['REQUEST_URI'] = '/';
+$_SERVER['SCRIPT_NAME'] = '/plugins/bratonien_tools/runtime/cleanup-missing-webdav-images.php';
+$_SERVER['PHP_SELF'] = $_SERVER['SCRIPT_NAME'];
+$_SERVER['QUERY_STRING'] = '';
+$_SERVER['HTTPS'] = 'off';
+
+require_once(PHPWG_ROOT_PATH.'include/common.inc.php');
+include_once(PHPWG_ROOT_PATH.'admin/include/functions.php');
+
+delete_elements($missing_ids, false);
+update_category('all');
+invalidate_user_cache(true);
+
+echo 'WebDAV-Bereinigung: '.count($missing_ids)." nicht mehr freigegebene/ vorhandene Bilder aus Piwigo entfernt.\n";