diff --git a/include/webdav_gallery_runtime.inc.php b/include/webdav_gallery_runtime.inc.php
deleted file mode 100644
index 97d5b7c..0000000
--- a/include/webdav_gallery_runtime.inc.php
+++ /dev/null
@@ -1,98 +0,0 @@
-<?php
-if (!defined('PHPWG_ROOT_PATH'))
-{
-  die('Hacking attempt!');
-}
-
-function bratonien_tools_webdav_derivative_matches_preview($derivative_path, $params, $image_id)
-{
-  $derivative_path = (string)$derivative_path;
-  $image_id = (int)$image_id;
-  if ($derivative_path === '' || $image_id < 1 || !is_file($derivative_path) || !is_readable($derivative_path)) return false;
-
-  $info = bratonien_tools_webdav_image_source_info($image_id);
-  if (!$info) return false;
-
-  $preview = bratonien_tools_webdav_preview_path($info);
-  if (!$preview || !is_file($preview) || !is_readable($preview)) return false;
-
-  $preview_size = @getimagesize($preview);
-  $derivative_size = @getimagesize($derivative_path);
-  if (!is_array($preview_size) || empty($preview_size[0]) || empty($preview_size[1])) return false;
-  if (!is_array($derivative_size) || empty($derivative_size[0]) || empty($derivative_size[1])) return false;
-
-  try
-  {
-    $expected_size = $params->compute_final_size(array((int)$preview_size[0], (int)$preview_size[1]));
-  }
-  catch (Throwable $e)
-  {
-    return false;
-  }
-
-  if (!is_array($expected_size) || !isset($expected_size[0], $expected_size[1])) return false;
-  if ((int)$derivative_size[0] !== (int)$expected_size[0] || (int)$derivative_size[1] !== (int)$expected_size[1]) return false;
-
-  $preview_mtime = @filemtime($preview) ?: 0;
-  $derivative_mtime = @filemtime($derivative_path) ?: 0;
-  if ($preview_mtime > 0 && $derivative_mtime < $preview_mtime) return false;
-
-  return true;
-}
-
-function bratonien_tools_webdav_ondemand_derivative_url($image_id, $params)
-{
-  $image_id = (int)$image_id;
-  if ($image_id < 1 || !is_object($params)) return null;
-
-  $type = trim((string)($params->type ?? ''));
-  if ($type === '') return null;
-
-  return get_root_url().'plugins/'.BRATONIEN_TOOLS_ID.'/webdav-derivative.php?id='.$image_id.'&type='.rawurlencode($type);
-}
-
-function bratonien_tools_filter_webdav_gallery_derivative_url($url, $params, $src_image, $rel_url)
-{
-  if (!is_object($src_image) || empty($src_image->id) || empty($src_image->rel_path)) return $url;
-
-  $source_path = str_replace('\\', '/', (string)$src_image->rel_path);
-  if (!preg_match('#/nc-webdav-source/connection-[0-9]+/root-[0-9]+/.+$#', $source_path))
-  {
-    return $url;
-  }
-
-  $image_id = (int)$src_image->id;
-  try
-  {
-    $derivative = new DerivativeImage($params, $src_image);
-    if (!$derivative->same_as_source())
-    {
-      $derivative_path = $derivative->get_path();
-      if (bratonien_tools_webdav_derivative_matches_preview($derivative_path, $params, $image_id))
-      {
-        return $url;
-      }
-    }
-  }
-  catch (Throwable $e)
-  {
-    error_log('Bratonien WebDAV derivative lookup #'.$image_id.': '.$e->getMessage());
-  }
-
-  // Auf der Picture-/Fotorama-Seite wird nicht mehr waehrend des HTML-Aufbaus
-  // synchron erzeugt. Fotorama arbeitet lazy: Erst wenn das konkrete Bild in
-  // den Fokus kommt und seine URL abruft, erzeugt dieser Endpoint genau dieses
-  // angeforderte Standard-Derivat aus dem bereits gecachten NC-Preview.
-  $script_name = basename((string)($_SERVER['SCRIPT_NAME'] ?? ''));
-  if ($script_name === 'picture.php')
-  {
-    $ondemand_url = bratonien_tools_webdav_ondemand_derivative_url($image_id, $params);
-    if ($ondemand_url) return $ondemand_url;
-  }
-
-  // Galerie-Fallback: niemals Connector-Platzhalter ausliefern. Solange kein
-  // lokales korrektes Derivat vorliegt, wird das echte vorbereitete NC-Preview
-  // verwendet. Der eigentliche Galerie-Derivattyp wird beim Sync vorgebaut.
-  $preview_url = bratonien_tools_webdav_image_url($image_id, true);
-  return $preview_url ?: $url;
-}