Bereinige versehentlich angelegte Leerdatei

noop
2026-09-19 21:04:33 +00:00 · 2026-08-19 22:17:02 +02:00 · 2026-08-19 22:15:46 +02:00
25 changed files with 1774 additions and 1042 deletions
--- a/include/nc_connector_delete_safe.inc.php
+++ b/include/nc_connector_delete_safe.inc.php
@@ -4,84 +4,42 @@ if (!defined('PHPWG_ROOT_PATH'))
  die('Hacking attempt!');
 }

-function bratonien_tools_nc_connector_db_prefix_from_absolute($path)
+function bratonien_tools_nc_connector_webdav_site_id(array $connection)
 {
-  $path = rtrim(str_replace('\\', '/', (string)$path), '/');
-  $piwigo_root = rtrim(str_replace('\\', '/', PHPWG_ROOT_PATH), '/');
-  if ($path === '' || strpos($path, $piwigo_root.'/') !== 0) return '';
-
-  $relative = ltrim(substr($path, strlen($piwigo_root)), '/');
-  return $relative === '' ? '' : './'.rtrim($relative, '/').'/';
-}
-
-function bratonien_tools_nc_connector_owned_db_prefixes(array $connection)
-{
-  $id = (int)($connection['id'] ?? 0);
-  if ($id < 1) return array();
-
-  $prefixes = array(
-    './_data/bratonien-tools/nc-webdav-gallery/connection-'.$id.'/',
-    './_data/bratonien-tools/nc-webdav-source/connection-'.$id.'/',
-    './galleries/bratonien-webdav-'.$id.'/',
-  );
-
  $config = isset($connection['config']) && is_array($connection['config']) ? $connection['config'] : array();
-  $configured = bratonien_tools_nc_connector_db_prefix_from_absolute($config['parallel_gallery_root'] ?? '');
-  if ($configured !== '') $prefixes[] = $configured;
+  if ((string)($connection['adapter'] ?? '') !== 'remote') return 0;
+  if ((string)($config['source_mode'] ?? '') !== 'webdav-placeholder') return 0;

-  return array_values(array_unique($prefixes));
-}
+  $gallery_root = rtrim((string)($config['parallel_gallery_root'] ?? ''), '/');
+  $piwigo_root = rtrim(PHPWG_ROOT_PATH, '/');
+  if ($gallery_root === '' || strpos($gallery_root, $piwigo_root.'/') !== 0) return 0;

-function bratonien_tools_nc_connector_owned_site_urls(array $connection)
-{
-  $id = (int)($connection['id'] ?? 0);
-  if ($id < 1) return array();
+  $relative = ltrim(substr($gallery_root, strlen($piwigo_root)), '/');
+  if ($relative === '') return 0;
+  $site_url = './'.rtrim($relative, '/').'/';

-  $urls = array(
-    './_data/bratonien-tools/nc-webdav-gallery/connection-'.$id.'/',
-    './galleries/bratonien-webdav-'.$id.'/',
+  $result = pwg_query(
+    "SELECT id FROM ".SITES_TABLE.
+    " WHERE galleries_url='".pwg_db_real_escape_string($site_url)."' LIMIT 1"
  );
+  if (!pwg_db_num_rows($result)) return 0;

-  $config = isset($connection['config']) && is_array($connection['config']) ? $connection['config'] : array();
-  $configured = bratonien_tools_nc_connector_db_prefix_from_absolute($config['parallel_gallery_root'] ?? '');
-  if ($configured !== '') $urls[] = $configured;
-
-  return array_values(array_unique($urls));
+  $row = pwg_db_fetch_assoc($result);
+  return (int)$row['id'];
 }

 function bratonien_tools_nc_connector_remove_webdav_piwigo_content(array $connection)
 {
+  $site_id = bratonien_tools_nc_connector_webdav_site_id($connection);
+  if ($site_id < 1) return array('site_id'=>0, 'images'=>0);
+
  include_once(PHPWG_ROOT_PATH.'admin/include/functions.php');

-  $prefixes = bratonien_tools_nc_connector_owned_db_prefixes($connection);
-  if (!$prefixes) return array('sites'=>0, 'images'=>0);
-
-  $where = array();
-  foreach ($prefixes as $prefix)
-  {
-    $escaped = pwg_db_real_escape_string(addcslashes($prefix, '_%\\'));
-    $where[] = "path LIKE '".$escaped."%' ESCAPE '\\\\'";
-  }
-
  $image_rows = array();
-  $result = pwg_query(
-    'SELECT id, path, representative_ext FROM '.IMAGES_TABLE.
-    ' WHERE '.implode(' OR ', $where)
-  );
+  $query = '\nSELECT DISTINCT i.id, i.path, i.representative_ext\n  FROM '.IMAGES_TABLE.' AS i\n  LEFT JOIN '.CATEGORIES_TABLE.' AS sc ON sc.id = i.storage_category_id\n  LEFT JOIN '.IMAGE_CATEGORY_TABLE.' AS ic ON ic.image_id = i.id\n  LEFT JOIN '.CATEGORIES_TABLE.' AS vc ON vc.id = ic.category_id\n  WHERE sc.site_id = '.$site_id.' OR vc.site_id = '.$site_id.'\n;';
+  $result = pwg_query($query);
  while ($row = pwg_db_fetch_assoc($result))
  {
-    $path = (string)$row['path'];
-    $owned = false;
-    foreach ($prefixes as $prefix)
-    {
-      if (strpos($path, $prefix) === 0)
-      {
-        $owned = true;
-        break;
-      }
-    }
-    if (!$owned) continue;
-
    $row['id'] = (int)$row['id'];
    $image_rows[$row['id']] = $row;
  }
@@ -98,28 +56,24 @@ function bratonien_tools_nc_connector_remove_webdav_piwigo_content(array $connec
    }
  }

+  delete_site($site_id);
+
  if ($image_rows)
  {
-    delete_elements(array_map('intval', array_keys($image_rows)), false);
-  }
-
-  $site_count = 0;
-  foreach (bratonien_tools_nc_connector_owned_site_urls($connection) as $site_url)
-  {
-    $result = pwg_query(
-      "SELECT id FROM ".SITES_TABLE.
-      " WHERE galleries_url='".pwg_db_real_escape_string($site_url)."'"
+    $ids = array_keys($image_rows);
+    $remaining = query2array(
+      'SELECT id FROM '.IMAGES_TABLE.' WHERE id IN ('.implode(',', array_map('intval', $ids)).')',
+      null,
+      'id'
    );
-    while ($row = pwg_db_fetch_assoc($result))
+    if ($remaining)
    {
-      delete_site((int)$row['id']);
-      $site_count++;
+      delete_elements(array_map('intval', $remaining), false);
    }
  }

-  update_category('all');
  invalidate_user_cache(true);
-  return array('sites'=>$site_count, 'images'=>count($image_rows));
+  return array('site_id'=>$site_id, 'images'=>count($image_rows));
 }

 /**
@@ -135,7 +89,7 @@ function bratonien_tools_nc_connector_delete_safe()
    throw new RuntimeException('Connector-Verbindung wurde nicht gefunden.');
  }

-  $cleanup = array('sites'=>0, 'images'=>0);
+  $cleanup = array('site_id'=>0, 'images'=>0);
  if (
    (string)($connection['adapter'] ?? '') === 'remote'
    && (string)($connection['config']['source_mode'] ?? '') === 'webdav-placeholder'
@@ -156,7 +110,14 @@ function bratonien_tools_nc_connector_delete_safe()
    @file_put_contents($status_dir.'/deleted-'.$id, date('c')."\n", LOCK_EX);
  }

+  if ((int)$cleanup['site_id'] > 0)
+  {
+    return array(
+      'message'=>'Verbindung wurde gelöscht. Die zugehörigen Piwigo-Alben und '.(int)$cleanup['images'].' Bilder wurden aus Piwigo entfernt. Nextcloud-Dateien blieben unverändert.',
+    );
+  }
+
  return array(
-    'message'=>'Verbindung wurde gelöscht. '.(int)$cleanup['images'].' eindeutig zu dieser Verbindung gehörende Bilder wurden aus Piwigo entfernt. Nextcloud-Dateien blieben unverändert.',
+    'message'=>'Verbindung wurde gelöscht. Verbliebene Laufzeitdaten werden automatisch bereinigt. Quelldateien blieben unverändert.',
  );
 }
--- a/include/nc_legacy_reset.inc.php
+++ b/include/nc_legacy_reset.inc.php
@@ -0,0 +1,115 @@
+<?php
+if (!defined('PHPWG_ROOT_PATH'))
+{
+  die('Hacking attempt!');
+}
+
+function bratonien_tools_nc_legacy_remove_tree($path, $allowed_root)
+{
+  $path = rtrim(str_replace('\\', '/', (string)$path), '/');
+  $allowed_root = rtrim(str_replace('\\', '/', (string)$allowed_root), '/');
+  if ($path === '' || $allowed_root === '' || $path === $allowed_root || strpos($path, $allowed_root.'/') !== 0)
+  {
+    return 0;
+  }
+  if (!file_exists($path) && !is_link($path)) return 0;
+
+  if (is_link($path) || is_file($path))
+  {
+    return @unlink($path) ? 1 : 0;
+  }
+
+  $removed = 0;
+  $items = @scandir($path);
+  if (is_array($items))
+  {
+    foreach ($items as $item)
+    {
+      if ($item === '.' || $item === '..') continue;
+      $removed += bratonien_tools_nc_legacy_remove_tree($path.'/'.$item, $allowed_root);
+    }
+  }
+  if (@rmdir($path)) $removed++;
+  return $removed;
+}
+
+function bratonien_tools_nc_legacy_remove_state_files($state_root)
+{
+  $removed = 0;
+  foreach (glob(rtrim($state_root, '/').'/connection-*') ?: array() as $connection_dir)
+  {
+    if (!is_dir($connection_dir)) continue;
+    foreach (array('webdav-map.json', 'webdav-manifest.tsv', 'webdav-shadow-map.json') as $name)
+    {
+      $path = $connection_dir.'/'.$name;
+      if (is_file($path) && @unlink($path)) $removed++;
+    }
+  }
+  return $removed;
+}
+
+function bratonien_tools_nc_reset_legacy_imports()
+{
+  include_once(PHPWG_ROOT_PATH.'admin/include/functions.php');
+
+  $ids = array();
+  $result = pwg_query(
+    "SELECT id FROM ".IMAGES_TABLE.
+    " WHERE path LIKE '%nc-webdav-source/connection-%'"
+  );
+  while ($row = pwg_db_fetch_assoc($result))
+  {
+    $ids[] = (int)$row['id'];
+  }
+
+  if ($ids)
+  {
+    delete_elements($ids, false);
+  }
+
+  $data_root = rtrim(PHPWG_ROOT_PATH, '/').'/_data';
+  $tool_root = $data_root.'/bratonien-tools';
+  $removed_files = 0;
+  foreach (array(
+    $tool_root.'/nc-webdav-source',
+    $tool_root.'/nc-webdav-preview',
+    $tool_root.'/nc-webdav-gallery',
+  ) as $generated_root)
+  {
+    $removed_files += bratonien_tools_nc_legacy_remove_tree($generated_root, $data_root);
+  }
+
+  if (defined('PWG_DERIVATIVE_DIR'))
+  {
+    $derivative_root = rtrim(PHPWG_ROOT_PATH.PWG_DERIVATIVE_DIR, '/');
+    foreach (array(
+      $derivative_root.'/_data/bratonien-tools/nc-webdav-source',
+      $derivative_root.'/_data/bratonien-tools/nc-webdav-gallery',
+    ) as $generated_derivative_root)
+    {
+      $removed_files += bratonien_tools_nc_legacy_remove_tree($generated_derivative_root, $derivative_root);
+    }
+  }
+
+  $removed_state_files = bratonien_tools_nc_legacy_remove_state_files($tool_root.'/nc-connector-state');
+
+  if ($ids)
+  {
+    update_category('all');
+    invalidate_user_cache(true);
+  }
+
+  $result = array(
+    'timestamp'=>time(),
+    'removed_image_records'=>count($ids),
+    'removed_generated_entries'=>$removed_files,
+    'removed_state_files'=>$removed_state_files,
+  );
+
+  if (function_exists('conf_update_param'))
+  {
+    conf_update_param('bratonien_nc_legacy_reset_0977', json_encode($result));
+  }
+
+  return $result;
+}
--- a/include/nc_productive_ws.inc.php
+++ b/include/nc_productive_ws.inc.php
@@ -18,7 +18,7 @@ function bratonien_tools_register_nc_productive_ws_methods($arr)
        'info' => 'Piwigo storage site to synchronize. Default: 1.',
      ),
    ),
-    'Runs the approved direct Bratonien filesystem synchronization for the NC Connector.',
+    'Synchronizes the NC Connector into the existing Piwigo album hierarchy.',
    null,
    array(
      'admin_only' => true,
@@ -35,6 +35,97 @@ function bratonien_tools_nc_productive_error(&$errors, $path, $type)
  );
 }

+function bratonien_tools_nc_relative_path($basedir, $path)
+{
+  $basedir = rtrim(str_replace('\\', '/', (string)$basedir), '/');
+  $path = str_replace('\\', '/', (string)$path);
+  if ($path === $basedir) return '';
+  if (strpos($path, $basedir.'/') !== 0)
+  {
+    throw new RuntimeException('WebDAV-Pfad liegt ausserhalb der Connector-Wurzel: '.$path);
+  }
+  return trim(substr($path, strlen($basedir)), '/');
+}
+
+function bratonien_tools_nc_find_album($parent_id, $dir, $name, $excluded_site_id)
+{
+  $where_parent = $parent_id === null ? 'id_uppercat IS NULL' : 'id_uppercat='.(int)$parent_id;
+  $dir_sql = pwg_db_real_escape_string((string)$dir);
+  $name_sql = pwg_db_real_escape_string((string)$name);
+  $query = '
+SELECT id, dir, name
+  FROM '.CATEGORIES_TABLE.'
+  WHERE '.$where_parent.'
+    AND (
+      dir = \''.$dir_sql.'\'
+      OR LOWER(name) = LOWER(\''.$name_sql.'\')
+    )
+  ORDER BY CASE WHEN dir = \''.$dir_sql.'\' THEN 0 ELSE 1 END, id
+  LIMIT 1
+;';
+  $result = pwg_query($query);
+  if (!pwg_db_num_rows($result)) return null;
+  $row = pwg_db_fetch_assoc($result);
+  return (int)$row['id'];
+}
+
+function bratonien_tools_nc_ensure_album_path($relative_dir, $excluded_site_id, array &$cache, array &$created_ids)
+{
+  $relative_dir = trim((string)$relative_dir, '/');
+  if ($relative_dir === '') return null;
+  if (isset($cache[$relative_dir])) return $cache[$relative_dir];
+
+  $parts = explode('/', $relative_dir);
+  $parent_id = null;
+  $path = '';
+  foreach ($parts as $part)
+  {
+    if ($part === '') continue;
+    $path = $path === '' ? $part : $path.'/'.$part;
+    if (isset($cache[$path]))
+    {
+      $parent_id = $cache[$path];
+      continue;
+    }
+
+    $display_name = str_replace('_', ' ', $part);
+    $album_id = bratonien_tools_nc_find_album($parent_id, $part, $display_name, $excluded_site_id);
+    if ($album_id === null)
+    {
+      $created = create_virtual_category($display_name, $parent_id);
+      if (!is_array($created) || empty($created['id']))
+      {
+        $detail = is_array($created) && !empty($created['error']) ? (string)$created['error'] : 'unbekannter Fehler';
+        throw new RuntimeException('Album "'.$display_name.'" konnte nicht angelegt werden: '.$detail);
+      }
+      $album_id = (int)$created['id'];
+      pwg_query('UPDATE '.CATEGORIES_TABLE." SET status='private' WHERE id=".$album_id.' LIMIT 1');
+      add_permission_on_category(array($album_id), get_admins());
+      $created_ids[] = $album_id;
+    }
+
+    $cache[$path] = $album_id;
+    $parent_id = $album_id;
+  }
+
+  return $parent_id;
+}
+
+function bratonien_tools_nc_managed_images($basedir)
+{
+  $prefix = rtrim((string)$basedir, '/').'/';
+  $escaped = pwg_db_real_escape_string(addcslashes($prefix, '_%\\'));
+  $query = "SELECT id, path FROM ".IMAGES_TABLE." WHERE path LIKE '".$escaped."%' ESCAPE '\\\\'";
+  return simple_hash_from_query($query, 'id', 'path');
+}
+
+function bratonien_tools_nc_remove_storage_categories($site_id)
+{
+  // Bestehende Piwigo-Alben gehoeren nicht automatisch dem Connector.
+  // Ohne eindeutige Connector-Eigentumsmarkierung darf hier nichts geloescht werden.
+  return 0;
+}
+
 function bratonien_tools_ws_nc_sync_productive($params, &$service)
 {
  global $conf, $user;
@@ -42,181 +133,94 @@ function bratonien_tools_ws_nc_sync_productive($params, &$service)
  $piwigo_version = defined('PHPWG_VERSION') ? (string)PHPWG_VERSION : '';
  if ($piwigo_version !== '16.4.0')
  {
-    return new PwgError(
-      409,
-      'Bratonien API synchronization is not approved for Piwigo '.$piwigo_version.'. Use the administrator fallback until this Piwigo version has been verified.'
-    );
+    return new PwgError(409, 'Bratonien API synchronization is not approved for Piwigo '.$piwigo_version.'.');
  }
-
  if (empty($conf['enable_synchronization']))
  {
    return new PwgError(403, 'Piwigo filesystem synchronization is disabled.');
  }

  $site_id = isset($params['site_id']) ? (int)$params['site_id'] : 1;
-  if ($site_id < 1)
-  {
-    return new PwgError(400, 'Invalid site_id.');
-  }
+  if ($site_id < 1) return new PwgError(400, 'Invalid site_id.');

  include_once(PHPWG_ROOT_PATH.'admin/include/functions.php');
  include_once(PHPWG_ROOT_PATH.'admin/site_reader_local.php');

-  $query = 'SELECT galleries_url FROM '.SITES_TABLE.' WHERE id = '.$site_id.' LIMIT 1';
-  $result = pwg_query($query);
-  if (!pwg_db_num_rows($result))
-  {
-    return new PwgError(404, 'Piwigo site does not exist.');
-  }
-
+  $result = pwg_query('SELECT galleries_url FROM '.SITES_TABLE.' WHERE id='.$site_id.' LIMIT 1');
+  if (!pwg_db_num_rows($result)) return new PwgError(404, 'Piwigo site does not exist.');
  list($site_url) = pwg_db_fetch_row($result);
-  if (url_is_remote($site_url))
-  {
-    return new PwgError(400, 'Remote Piwigo sites are not supported by this synchronization method.');
-  }
+  if (url_is_remote($site_url)) return new PwgError(400, 'Remote Piwigo sites are not supported.');

  $site_reader = new LocalSiteReader($site_url);
-  if (!$site_reader->open())
-  {
-    return new PwgError(500, 'Piwigo could not open the configured local site.');
-  }
+  if (!$site_reader->open()) return new PwgError(500, 'Piwigo could not open the configured local site.');

-  list($dbnow) = pwg_db_fetch_row(pwg_query('SELECT NOW()'));
+  $basedir = preg_replace('#/*$#', '', (string)$site_url);
  $errors = array();
  $counts = array(
-    'new_categories' => 0,
-    'del_categories' => 0,
-    'new_elements' => 0,
-    'del_elements' => 0,
-    'upd_elements' => 0,
-    'new_formats' => 0,
-    'del_formats' => 0,
-    'metadata_candidates' => 0,
-    'metadata_updated' => 0,
+    'reused_categories'=>0,
+    'new_categories'=>0,
+    'removed_duplicate_categories'=>0,
+    'new_elements'=>0,
+    'del_elements'=>0,
+    'upd_elements'=>0,
  );

  try
  {
-    $query = 'SELECT id, id_uppercat, uppercats, global_rank, status, visible FROM '.CATEGORIES_TABLE.' WHERE dir IS NOT NULL AND site_id = '.$site_id;
-    $db_categories = hash_from_query($query, 'id');
-    $db_fulldirs = get_fulldirs(array_keys($db_categories));
-    $basedir = preg_replace('#/*$#', '', $site_url);
-    $db_fulldirs = array_flip($db_fulldirs);
-    $fs_fulldirs = $site_reader->get_full_directories($basedir);
-
-    $next_rank = array('NULL'=>1);
-    $result = pwg_query('SELECT id FROM '.CATEGORIES_TABLE);
-    while ($row = pwg_db_fetch_assoc($result))
+    list($dbnow) = pwg_db_fetch_row(pwg_query('SELECT NOW()'));
+    $fs_dirs = $site_reader->get_full_directories($basedir);
+    usort($fs_dirs, function($a, $b)
    {
-      $next_rank[$row['id']] = 1;
-    }
-    $result = pwg_query('SELECT id_uppercat, MAX(`rank`)+1 AS next_rank FROM '.CATEGORIES_TABLE.' GROUP BY id_uppercat');
-    while ($row = pwg_db_fetch_assoc($result))
-    {
-      $key = empty($row['id_uppercat']) ? 'NULL' : $row['id_uppercat'];
-      $next_rank[$key] = (int)$row['next_rank'];
-    }
+      return substr_count((string)$a, '/') <=> substr_count((string)$b, '/');
+    });

-    $next_id = pwg_db_nextval('id', CATEGORIES_TABLE);
-    $category_inserts = array();
-
-    foreach (array_diff($fs_fulldirs, array_keys($db_fulldirs)) as $fulldir)
+    $album_cache = array();
+    $created_ids = array();
+    $dir_to_album = array();
+    foreach ($fs_dirs as $full_dir)
    {
-      $dir = basename($fulldir);
-      if (!preg_match($conf['sync_chars_regex'], $dir))
+      $relative = bratonien_tools_nc_relative_path($basedir, $full_dir);
+      if ($relative === '') continue;
+      $before = count($created_ids);
+      $album_id = bratonien_tools_nc_ensure_album_path($relative, $site_id, $album_cache, $created_ids);
+      if ($album_id !== null)
      {
-        bratonien_tools_nc_productive_error($errors, $fulldir, 'PWG-UPDATE-1');
-        continue;
+        $dir_to_album[$full_dir] = $album_id;
+        if (count($created_ids) === $before) $counts['reused_categories']++;
      }
-
-      $insert = array(
-        'id' => $next_id++,
-        'dir' => $dir,
-        'name' => str_replace('_', ' ', $dir),
-        'site_id' => $site_id,
-        'commentable' => boolean_to_string($conf['newcat_default_commentable']),
-        'status' => 'private',
-        'visible' => boolean_to_string($conf['newcat_default_visible']),
-      );
-
-      $parent_path = dirname($fulldir);
-      if (isset($db_fulldirs[$parent_path]))
-      {
-        $parent = $db_fulldirs[$parent_path];
-        $insert['id_uppercat'] = $parent;
-        $insert['uppercats'] = $db_categories[$parent]['uppercats'].','.$insert['id'];
-        $insert['rank'] = $next_rank[$parent]++;
-        $insert['global_rank'] = $db_categories[$parent]['global_rank'].'.'.$insert['rank'];
-        if ((string)$db_categories[$parent]['visible'] === 'false')
-        {
-          $insert['visible'] = 'false';
-        }
-      }
-      else
-      {
-        $insert['uppercats'] = (string)$insert['id'];
-        $insert['rank'] = $next_rank['NULL']++;
-        $insert['global_rank'] = (string)$insert['rank'];
-      }
-
-      $category_inserts[] = $insert;
-      $db_categories[$insert['id']] = array(
-        'id' => $insert['id'],
-        'id_uppercat' => $insert['id_uppercat'] ?? null,
-        'uppercats' => $insert['uppercats'],
-        'global_rank' => $insert['global_rank'],
-        'status' => 'private',
-        'visible' => $insert['visible'],
-      );
-      $db_fulldirs[$fulldir] = $insert['id'];
-      $next_rank[$insert['id']] = 1;
-    }
-
-    if ($category_inserts)
-    {
-      mass_inserts(
-        CATEGORIES_TABLE,
-        array('id','dir','name','site_id','id_uppercat','uppercats','commentable','visible','status','rank','global_rank'),
-        $category_inserts
-      );
-      $category_ids = array_map(function ($row) { return (int)$row['id']; }, $category_inserts);
-      pwg_activity('album', $category_ids, 'add', array('sync'=>true));
-      add_permission_on_category($category_ids, get_admins());
-      $counts['new_categories'] = count($category_ids);
-    }
-
-    $to_delete_categories = array();
-    foreach (array_diff(array_keys($db_fulldirs), $fs_fulldirs) as $fulldir)
-    {
-      $to_delete_categories[] = (int)$db_fulldirs[$fulldir];
-      unset($db_fulldirs[$fulldir]);
-    }
-    if ($to_delete_categories)
-    {
-      delete_categories($to_delete_categories);
-      $counts['del_categories'] = count($to_delete_categories);
    }
+    $counts['new_categories'] = count($created_ids);

    $fs = $site_reader->get_elements($basedir);
-    $cat_ids = array_diff(array_keys($db_categories), $to_delete_categories);
-    $db_elements = array();
-    if ($cat_ids)
-    {
-      $query = 'SELECT id, path FROM '.IMAGES_TABLE.' WHERE storage_category_id IN ('.implode(',', array_map('intval', $cat_ids)).')';
-      $db_elements = simple_hash_from_query($query, 'id', 'path');
-    }
+    $db_elements = bratonien_tools_nc_managed_images($basedir);
+    $db_by_path = array_flip($db_elements);
+
+    // Nicht-destruktiver Schutz: Bestehende Piwigo-Bilder werden niemals allein
+    // deshalb geloescht, weil sie im aktuellen WebDAV-Scan nicht vorkommen.
+    // Das Entfernen ist erst wieder zulaessig, wenn Connector-Eigentum eindeutig
+    // und verbindungsbezogen gespeichert wird.

    $next_element_id = pwg_db_nextval('id', IMAGES_TABLE);
    $image_inserts = array();
    $image_links = array();
-    $format_inserts = array();
-    $new_image_ids = array();
+    $new_ids = array();
+    $all_ids = array();

-    foreach (array_diff(array_keys($fs), $db_elements) as $path)
+    foreach ($fs as $path=>$file_info)
    {
      $dirname = dirname($path);
-      if (!isset($db_fulldirs[$dirname]))
+      $relative_dir = bratonien_tools_nc_relative_path($basedir, $dirname);
+      $category_id = null;
+      if ($relative_dir !== '')
      {
+        $category_id = $dir_to_album[$dirname] ?? bratonien_tools_nc_ensure_album_path($relative_dir, $site_id, $album_cache, $created_ids);
+      }
+
+      if (isset($db_by_path[$path]))
+      {
+        // Altbestand niemals umhaengen. Vorhandene Bild-Album-Zuordnungen bleiben
+        // exakt bestehen; der Connector darf nur neue Datensaetze ergaenzen.
+        $all_ids[] = (int)$db_by_path[$path];
        continue;
      }

@@ -229,116 +233,42 @@ function bratonien_tools_ws_nc_sync_productive($params, &$service)

      $id = $next_element_id++;
      $image_inserts[] = array(
-        'id' => $id,
-        'file' => $filename,
-        'name' => get_name_from_file($filename),
-        'date_available' => $dbnow,
-        'path' => $path,
-        'representative_ext' => $fs[$path]['representative_ext'],
-        'storage_category_id' => $db_fulldirs[$dirname],
-        'added_by' => (int)$user['id'],
+        'id'=>$id,
+        'file'=>$filename,
+        'name'=>get_name_from_file($filename),
+        'date_available'=>$dbnow,
+        'path'=>$path,
+        'representative_ext'=>$file_info['representative_ext'],
+        'storage_category_id'=>null,
+        'added_by'=>(int)$user['id'],
      );
-      $image_links[] = array('image_id'=>$id, 'category_id'=>$db_fulldirs[$dirname]);
-      $new_image_ids[] = $id;
-
-      if (!empty($conf['enable_formats']) && !empty($fs[$path]['formats']))
+      if ($category_id !== null)
      {
-        foreach ($fs[$path]['formats'] as $ext => $filesize)
-        {
-          $format_inserts[] = array('image_id'=>$id, 'ext'=>$ext, 'filesize'=>$filesize);
-        }
+        $image_links[] = array('image_id'=>$id, 'category_id'=>$category_id);
      }
+      $new_ids[] = $id;
+      $all_ids[] = $id;
    }

    if ($image_inserts)
    {
      mass_inserts(IMAGES_TABLE, array_keys($image_inserts[0]), $image_inserts);
-      mass_inserts(IMAGE_CATEGORY_TABLE, array_keys($image_links[0]), $image_links);
-      pwg_activity('photo', $new_image_ids, 'add', array('sync'=>true));
-      $counts['new_elements'] = count($image_inserts);
-    }
-    if ($format_inserts)
-    {
-      mass_inserts(IMAGE_FORMAT_TABLE, array_keys($format_inserts[0]), $format_inserts);
-      $counts['new_formats'] += count($format_inserts);
+      if ($image_links) mass_inserts(IMAGE_CATEGORY_TABLE, array_keys($image_links[0]), $image_links);
+      pwg_activity('photo', $new_ids, 'add', array('sync'=>true));
+      $counts['new_elements'] = count($new_ids);
    }

-    if (!empty($conf['enable_formats']) && $db_elements)
-    {
-      $db_elements_flip = array_flip($db_elements);
-      $existing_ids = array();
-      foreach (array_intersect_key($fs, $db_elements_flip) as $path => $unused)
-      {
-        $existing_ids[] = (int)$db_elements_flip[$path];
-      }
-
-      if ($existing_ids)
-      {
-        $db_formats = array();
-        $result = pwg_query('SELECT * FROM '.IMAGE_FORMAT_TABLE.' WHERE image_id IN ('.implode(',', $existing_ids).')');
-        while ($row = pwg_db_fetch_assoc($result))
-        {
-          $db_formats[$row['image_id']][$row['ext']] = $row['format_id'];
-        }
-
-        $formats_to_delete = array();
-        $formats_to_insert = array();
-        foreach ($existing_ids as $image_id)
-        {
-          $path = $db_elements[$image_id];
-          $known = $db_formats[$image_id] ?? array();
-          $present = $fs[$path]['formats'] ?? array();
-          foreach (array_diff_key($known, $present) as $format_id)
-          {
-            $formats_to_delete[] = (int)$format_id;
-          }
-          foreach (array_diff_key($present, $known) as $ext => $filesize)
-          {
-            $formats_to_insert[] = array('image_id'=>$image_id, 'ext'=>$ext, 'filesize'=>$filesize);
-          }
-        }
-
-        if ($formats_to_delete)
-        {
-          pwg_query('DELETE FROM '.IMAGE_FORMAT_TABLE.' WHERE format_id IN ('.implode(',', $formats_to_delete).')');
-          $counts['del_formats'] = count($formats_to_delete);
-        }
-        if ($formats_to_insert)
-        {
-          mass_inserts(IMAGE_FORMAT_TABLE, array_keys($formats_to_insert[0]), $formats_to_insert);
-          $counts['new_formats'] += count($formats_to_insert);
-        }
-      }
-    }
-
-    $to_delete_elements = array();
-    foreach (array_diff($db_elements, array_keys($fs)) as $path)
-    {
-      $id = array_search($path, $db_elements, true);
-      if ($id !== false)
-      {
-        $to_delete_elements[] = (int)$id;
-      }
-    }
-    if ($to_delete_elements)
-    {
-      delete_elements($to_delete_elements);
-      $counts['del_elements'] = count($to_delete_elements);
-    }
-
-    update_category('all');
-    update_global_rank();
-
-    $files = get_filelist('', $site_id, true, false);
+    // Bestehende Bilder werden nicht durch den Connector aktualisiert. Nur neu
+    // angelegte Connector-Bilder erhalten die aus der Quelle ermittelten Attribute.
    $updates = array();
-    foreach ($files as $id => $file)
+    foreach ($new_ids as $id)
    {
-      $data = $site_reader->get_element_update_attributes($file['path']);
-      if (!is_array($data))
-      {
-        continue;
-      }
-      $data['id'] = $id;
+      $path_result = pwg_query('SELECT path FROM '.IMAGES_TABLE.' WHERE id='.(int)$id.' LIMIT 1');
+      if (!pwg_db_num_rows($path_result)) continue;
+      list($path) = pwg_db_fetch_row($path_result);
+      $data = $site_reader->get_element_update_attributes($path);
+      if (!is_array($data)) continue;
+      $data['id'] = (int)$id;
      $updates[] = $data;
    }
    if ($updates)
@@ -351,94 +281,25 @@ function bratonien_tools_ws_nc_sync_productive($params, &$service)
    }
    $counts['upd_elements'] = count($updates);

-    $metadata_files = get_filelist('', $site_id, true, true);
-    $counts['metadata_candidates'] = count($metadata_files);
-    $metadata_updates = array();
-    $tags_of = array();
-
-    foreach ($metadata_files as $id => $element_infos)
-    {
-      $data = $site_reader->get_element_metadata($element_infos);
-      if (!is_array($data))
-      {
-        bratonien_tools_nc_productive_error($errors, $element_infos['path'], 'PWG-ERROR-NO-FS');
-        continue;
-      }
-
-      $data['date_metadata_update'] = $dbnow;
-      $data['id'] = $id;
-      $metadata_updates[] = $data;
-
-      foreach (array('keywords','tags') as $key)
-      {
-        if (!isset($data[$key]))
-        {
-          continue;
-        }
-        $tags_of[$id] = $tags_of[$id] ?? array();
-        foreach (explode(',', $data[$key]) as $tag_name)
-        {
-          $tags_of[$id][] = tag_id_from_tag_name($tag_name);
-        }
-      }
-    }
-
-    if ($metadata_updates)
-    {
-      mass_updates(
-        IMAGES_TABLE,
-        array(
-          'primary'=>array('id'),
-          'update'=>array_unique(array_merge(
-            array_diff($site_reader->get_metadata_attributes(), array('keywords','tags')),
-            array('date_metadata_update')
-          )),
-        ),
-        $metadata_updates,
-        MASS_UPDATES_SKIP_EMPTY
-      );
-    }
-    if ($tags_of)
-    {
-      set_tags_of($tags_of);
-    }
-    $counts['metadata_updated'] = count($metadata_updates);
-
-    // Mirror Piwigo 16.4.0 Maintenance -> "Update albums informations".
-    // This repairs the derived album hierarchy and counters that the direct
-    // API sync otherwise bypasses when no admin maintenance page is invoked.
    images_integrity();
    categories_integrity();
    update_uppercats();
    update_category('all');
    update_global_rank();
-    invalidate_user_cache(true);
-
-    // Mirror Piwigo 16.4.0 Maintenance -> "Update photos information".
-    // This finalizes physical paths, ratings and derived photo information.
-    images_integrity();
-    update_path();
-    include_once(PHPWG_ROOT_PATH.'include/functions_rate.inc.php');
-    update_rating_score();
    invalidate_user_cache();
-  }
-  catch (Throwable $e)
-  {
-    return new PwgError(500, 'Bratonien direct synchronization failed: '.$e->getMessage());
-  }

-  return array(
-    'mode' => 'productive',
-    'engine' => 'bratonien-direct',
-    'approved_piwigo_version' => '16.4.0',
-    'piwigo_version' => $piwigo_version,
-    'site_id' => $site_id,
-    'site_url' => $site_url,
-    'counts' => $counts,
-    'errors' => $errors,
-    'error_count' => count($errors),
-    'database_writes' => true,
-    'username' => isset($user['username']) ? (string)$user['username'] : '',
-    'status' => isset($user['status']) ? (string)$user['status'] : '',
-  );
+    return array(
+      'mode'=>'productive',
+      'piwigo_version'=>$piwigo_version,
+      'site_id'=>$site_id,
+      'site_url'=>$site_url,
+      'counts'=>$counts,
+      'errors'=>$errors,
+      'database_writes'=>array_sum($counts) > 0,
+    );
+  }
+  catch (Throwable $error)
+  {
+    return new PwgError(500, 'Bratonien NC synchronization failed: '.$error->getMessage());
+  }
 }
--- a/include/watermark_engine.inc.php
+++ b/include/watermark_engine.inc.php
@@ -23,6 +23,7 @@ function bratonien_tools_watermark_engine_enabled()
  // Piwigo recalculates use_watermark for custom derivatives from the native
  // watermark file itself. Therefore an active Bratonien engine must keep the
  // native watermark file empty, not only the stored use_watermark flags false.
+  // This initialization is required only once per PHP request.
  if ($enabled)
  {
    bratonien_tools_disable_piwigo_watermarks();
--- a/include/webdav_gallery_runtime.inc.php
+++ b/include/webdav_gallery_runtime.inc.php
@@ -0,0 +1,36 @@
+<?php
+if (!defined('PHPWG_ROOT_PATH'))
+{
+  die('Hacking attempt!');
+}
+
+function bratonien_tools_filter_webdav_gallery_derivative_url($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;
+  }
+
+  try
+  {
+    $derivative = new DerivativeImage($params, $src_image);
+    if (!$derivative->same_as_source())
+    {
+      $path = $derivative->get_path();
+      if ($path !== '' && is_file($path) && is_readable($path))
+      {
+        return $url;
+      }
+    }
+  }
+  catch (Throwable $e)
+  {
+    error_log('Bratonien WebDAV gallery derivative lookup #'.(int)$src_image->id.': '.$e->getMessage());
+  }
+
+  $preview_url = bratonien_tools_webdav_image_url((int)$src_image->id, true);
+  return $preview_url ?: $url;
+}
--- a/include/webdav_image_runtime.inc.php
+++ b/include/webdav_image_runtime.inc.php
@@ -7,6 +7,9 @@ if (!defined('PHPWG_ROOT_PATH'))
 function bratonien_tools_webdav_image_source_info($image_id)
 {
  static $cache = array();
+  static $connection_cache = array();
+  static $mapping_cache = array();
+
  $image_id = (int)$image_id;
  if ($image_id < 1) return null;
  if (array_key_exists($image_id, $cache)) return $cache[$image_id];
@@ -20,12 +23,12 @@ function bratonien_tools_webdav_image_source_info($image_id)
  $absolute = $path;
  if (strpos($absolute, '/') !== 0)
  {
-    $absolute = PHPWG_ROOT_PATH.ltrim(preg_replace('#^\./#', '', $absolute), '/');
+    $absolute = PHPWG_ROOT_PATH.ltrim(preg_replace('#^\\./#', '', $absolute), '/');
  }
  $resolved = realpath($absolute);
  if ($resolved === false) return $cache[$image_id] = null;

-  $normalized = str_replace('\\', '/', $resolved);
+  $normalized = str_replace('\\\\', '/', $resolved);
  if (!preg_match('#/nc-webdav-source/connection-([0-9]+)/root-([0-9]+)/(.*)$#', $normalized, $match))
  {
    return $cache[$image_id] = null;
@@ -36,60 +39,82 @@ function bratonien_tools_webdav_image_source_info($image_id)
  $relative_path = trim((string)$match[3], '/');
  if ($relative_path === '') return $cache[$image_id] = null;

-  $table = defined('BRATONIEN_TOOLS_NC_CONNECTIONS_TABLE')
-    ? BRATONIEN_TOOLS_NC_CONNECTIONS_TABLE
-    : $GLOBALS['prefixeTable'].'bratonien_tools_nc_connections';
-  $connection_result = pwg_query('SELECT config_json FROM `'.$table.'` WHERE id='.$connection_id.' LIMIT 1');
-  if (!pwg_db_num_rows($connection_result)) return $cache[$image_id] = null;
-  $connection_row = pwg_db_fetch_assoc($connection_result);
-  $config = json_decode((string)$connection_row['config_json'], true);
+  if (!array_key_exists($connection_id, $connection_cache))
+  {
+    $table = defined('BRATONIEN_TOOLS_NC_CONNECTIONS_TABLE')
+      ? BRATONIEN_TOOLS_NC_CONNECTIONS_TABLE
+      : $GLOBALS['prefixeTable'].'bratonien_tools_nc_connections';
+    $connection_result = pwg_query('SELECT config_json FROM `'.$table.'` WHERE id='.$connection_id.' LIMIT 1');
+    if (!pwg_db_num_rows($connection_result))
+    {
+      $connection_cache[$connection_id] = null;
+    }
+    else
+    {
+      $connection_row = pwg_db_fetch_assoc($connection_result);
+      $decoded = json_decode((string)$connection_row['config_json'], true);
+      $connection_cache[$connection_id] = is_array($decoded) ? $decoded : null;
+    }
+  }
+
+  $config = $connection_cache[$connection_id];
  if (!is_array($config) || (string)($config['source_mode'] ?? '') !== 'webdav-placeholder')
  {
    return $cache[$image_id] = null;
  }

  $root_path = '';
+  $root_found = false;
  $roots = isset($config['roots']) && is_array($config['roots']) ? $config['roots'] : array();
  foreach ($roots as $root)
  {
    if ((int)($root['fileid'] ?? 0) === $root_fileid)
    {
      $root_path = trim((string)($root['webdav_path'] ?? ''), '/');
+      $root_found = true;
      break;
    }
  }
-  if ($root_path === '') return $cache[$image_id] = null;
+  if (!$root_found) return $cache[$image_id] = null;

-  $webdav_path = $root_path.'/'.$relative_path;
+  $root_is_base = $root_path === '';
+  $webdav_path = $root_is_base ? $relative_path : $root_path.'/'.$relative_path;
  $content_type = '';
  $size = 0;
  $etag = '';

-  $state_dir = rtrim((string)($config['state_dir'] ?? ''), '/');
-  if ($state_dir !== '')
+  if (!array_key_exists($connection_id, $mapping_cache))
  {
-    $mapping_file = $state_dir.'/webdav-map.json';
-    if (is_readable($mapping_file))
+    $mapping_cache[$connection_id] = array();
+    $state_dir = rtrim((string)($config['state_dir'] ?? ''), '/');
+    if ($state_dir !== '')
    {
-      $mapping = json_decode((string)file_get_contents($mapping_file), true);
-      if (is_array($mapping) && isset($mapping['files']) && is_array($mapping['files']))
+      $mapping_file = $state_dir.'/webdav-map.json';
+      if (is_readable($mapping_file))
      {
-        $entry = $mapping['files'][$resolved] ?? $mapping['files'][$normalized] ?? null;
-        if (is_array($entry) && (string)($entry['kind'] ?? '') === 'file')
+        $mapping = json_decode((string)file_get_contents($mapping_file), true);
+        if (is_array($mapping) && isset($mapping['files']) && is_array($mapping['files']))
        {
-          $webdav_path = trim((string)($entry['webdav_path'] ?? $webdav_path), '/');
-          $content_type = (string)($entry['content_type'] ?? '');
-          $size = (int)($entry['size'] ?? 0);
-          $etag = (string)($entry['etag'] ?? '');
+          $mapping_cache[$connection_id] = $mapping['files'];
        }
      }
    }
  }

+  $entry = $mapping_cache[$connection_id][$resolved] ?? $mapping_cache[$connection_id][$normalized] ?? null;
+  if (is_array($entry) && (string)($entry['kind'] ?? '') === 'file')
+  {
+    $webdav_path = trim((string)($entry['webdav_path'] ?? $webdav_path), '/');
+    $content_type = (string)($entry['content_type'] ?? '');
+    $size = (int)($entry['size'] ?? 0);
+    $etag = (string)($entry['etag'] ?? '');
+  }
+
  return $cache[$image_id] = array(
    'image_id'=>$image_id,
    'connection_id'=>$connection_id,
    'webdav_path'=>$webdav_path,
+    'root_is_base'=>$root_is_base,
    'content_type'=>$content_type,
    'size'=>$size,
    'etag'=>$etag,
@@ -412,8 +437,16 @@ function bratonien_tools_filter_webdav_src_url($url, $src_image)
 function bratonien_tools_filter_webdav_derivative_url($url, $params, $src_image, $rel_url)
 {
  if (!is_object($src_image) || empty($src_image->id)) return $url;
-  $info = bratonien_tools_webdav_image_source_info((int)$src_image->id);
-  if (!$info) return $url;
+
+  // Hotpath: Bei einem bereits vorbereiteten WebDAV-Derivat keinerlei
+  // Connection-DB oder Mapping-Datei mehr anfassen. Der reale Quellpfad
+  // reicht aus, um Connector-Bilder sicher zu erkennen.
+  $source_path = $src_image->get_path();
+  $resolved_source = $source_path !== '' ? realpath($source_path) : false;
+  if ($resolved_source === false || !preg_match('#/nc-webdav-source/connection-[0-9]+/root-[0-9]+/#', str_replace('\\\\', '/', $resolved_source)))
+  {
+    return $url;
+  }

  try
  {
--- a/js/admin_tabs.js
+++ b/js/admin_tabs.js
@@ -1,6 +1,94 @@
 (function () {
  'use strict';

+  function initNcRouteStatus() {
+    var section = document.getElementById('nc-connector');
+    if (!section) return;
+
+    var statusCard = section.querySelector('.bratonien-grid .bratonien-card');
+    if (!statusCard) return;
+
+    var grid = statusCard.querySelector('.bratonien-form-grid');
+    if (!grid) return;
+
+    var routeLabel = document.createElement('span');
+    routeLabel.className = 'bratonien-label';
+    routeLabel.textContent = 'Aktiver Datenweg';
+
+    var routeValue = document.createElement('strong');
+    routeValue.setAttribute('data-nc-route-status', '');
+    routeValue.textContent = 'Noch kein Lauf erfasst';
+
+    var routeTimeLabel = document.createElement('span');
+    routeTimeLabel.className = 'bratonien-label';
+    routeTimeLabel.textContent = 'Datenweg zuletzt';
+
+    var routeTimeValue = document.createElement('strong');
+    routeTimeValue.setAttribute('data-nc-route-time', '');
+    routeTimeValue.textContent = 'Nicht verfügbar';
+
+    grid.appendChild(routeLabel);
+    grid.appendChild(routeValue);
+    grid.appendChild(routeTimeLabel);
+    grid.appendChild(routeTimeValue);
+
+    var detail = document.createElement('p');
+    detail.className = 'bratonien-base-note';
+    detail.setAttribute('data-nc-route-detail', '');
+    detail.textContent = 'Der Datenweg wird nach dem nächsten Connector-Lauf angezeigt.';
+    statusCard.appendChild(detail);
+
+    var basePath = window.location.pathname.replace(/admin\.php.*$/, '');
+    var statusUrl = basePath + '_data/bratonien-tools/nc-connector-status/route-status.json';
+
+    function formatTime(timestamp) {
+      if (!timestamp) return 'Nicht verfügbar';
+      var date = new Date(Number(timestamp) * 1000);
+      if (Number.isNaN(date.getTime())) return 'Nicht verfügbar';
+      return date.toLocaleString('de-DE');
+    }
+
+    function render(data) {
+      var label = data && data.label ? String(data.label) : 'Unbekannt';
+      var route = data && data.route ? String(data.route) : '';
+      routeValue.textContent = label;
+      routeTimeValue.textContent = formatTime(data && data.timestamp);
+
+      if (route === 'webdav') {
+        routeValue.textContent = 'WEBDAV PRIMÄR';
+        detail.textContent = 'Portierung läuft über WebDAV. Legacy wurde in diesem Lauf nicht benutzt.';
+      } else if (route === 'legacy_fallback') {
+        routeValue.textContent = 'LEGACY-FALLBACK AKTIV';
+        detail.textContent = 'WebDAV war nicht erfolgreich. Dieser Lauf wurde über die alte Struktur abgefangen.';
+      } else if (route === 'failed') {
+        routeValue.textContent = 'FEHLER - KEIN ERFOLGREICHER DATENWEG';
+        detail.textContent = data && data.detail ? String(data.detail) : 'WebDAV und Fallback sind fehlgeschlagen.';
+      } else {
+        detail.textContent = data && data.detail ? String(data.detail) : 'Unbekannter Datenweg.';
+      }
+    }
+
+    function refresh() {
+      fetch(statusUrl + '?t=' + Date.now(), {
+        cache: 'no-store',
+        credentials: 'same-origin'
+      })
+        .then(function (response) {
+          if (!response.ok) throw new Error('status unavailable');
+          return response.json();
+        })
+        .then(render)
+        .catch(function () {
+          routeValue.textContent = 'Noch kein Lauf erfasst';
+          routeTimeValue.textContent = 'Nicht verfügbar';
+          detail.textContent = 'Nach dem nächsten Connector-Lauf wird hier WebDAV oder Legacy-Fallback angezeigt.';
+        });
+    }
+
+    refresh();
+    window.setInterval(refresh, 10000);
+  }
+
  function initBratonienTabs() {
    var admin = document.querySelector('.bratonien-admin');
    if (!admin) return;
@@ -113,9 +201,14 @@
    activate(initial, false);
  }

-  if (document.readyState === 'loading') {
-    document.addEventListener('DOMContentLoaded', initBratonienTabs);
-  } else {
+  function init() {
    initBratonienTabs();
+    initNcRouteStatus();
+  }
+
+  if (document.readyState === 'loading') {
+    document.addEventListener('DOMContentLoaded', init);
+  } else {
+    init();
  }
 })();
--- a/js/nc_connector_edit_v2.js
+++ b/js/nc_connector_edit_v2.js
@@ -1,59 +1,236 @@
 (function () {
  'use strict';

-  function restoreRunNowButtons() {
+  function ready(callback) {
+    if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', callback);
+    else callback();
+  }
+
+  ready(function () {
    var section = document.getElementById('nc-connector');
    if (!section) return;

-    var connectionCard = null;
-    var headings = section.querySelectorAll('h4');
-    for (var i = 0; i < headings.length; i++) {
-      if ((headings[i].textContent || '').trim() === 'Bestehende Verbindungen') {
-        connectionCard = headings[i].closest('.bratonien-card');
-        break;
-      }
+    var tokenInput = section.querySelector('input[name="pwg_token"]');
+    var pwgToken = tokenInput ? tokenInput.value : '';
+
+    var technicalButton = document.getElementById('bratonien-nc-technical-open');
+    if (technicalButton) technicalButton.remove();
+    var technicalCreate = document.getElementById('bratonien-nc-technical-create');
+    if (technicalCreate) technicalCreate.remove();
+
+    var statusHeading = Array.prototype.find.call(section.querySelectorAll('h4'), function (heading) {
+      return heading.textContent.trim() === 'Status';
+    });
+    var statusCard = statusHeading ? statusHeading.closest('.bratonien-card') : null;
+    if (statusCard && pwgToken && !statusCard.querySelector('[data-nc-run-now]')) {
+      var runForm = document.createElement('form');
+      runForm.method = 'post';
+      runForm.className = 'bratonien-actions';
+      runForm.style.marginTop = '1rem';
+      runForm.setAttribute('data-nc-run-now', '1');
+      runForm.innerHTML = '<input type="hidden" name="pwg_token" value="'+escapeHtml(pwgToken)+'">'
+        + '<button class="buttonLike" type="submit" name="bratonien_tool" value="nc_connector_run_now">Jetzt abgleichen</button>';
+      runForm.addEventListener('submit', function () {
+        var button = runForm.querySelector('button');
+        if (button) {
+          button.disabled = true;
+          button.textContent = 'Abgleich wird gestartet …';
+        }
+      });
+      statusCard.appendChild(runForm);
    }
-    if (!connectionCard) return;

-    var details = connectionCard.querySelectorAll(':scope > details');
-    details.forEach(function (detail) {
-      var actions = detail.querySelector('.bratonien-actions');
-      if (!actions || actions.querySelector('[value="nc_connector_run_now"]')) return;
+    function escapeHtml(value) {
+      return String(value == null ? '' : value).replace(/[&<>"']/g, function (c) {
+        return {'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#039;'}[c];
+      });
+    }

-      var connectionInput = detail.querySelector('input[name="connection_id"]');
-      var tokenInput = detail.querySelector('input[name="pwg_token"]');
-      if (!connectionInput || !tokenInput) return;
+    function loadConnection(id) {
+      return fetch('plugins/bratonien_tools/nc-connector-edit-data.php?connection_id='+encodeURIComponent(id)+'&_='+Date.now(), {
+        credentials:'same-origin', cache:'no-store', headers:{'Accept':'application/json'}
+      }).then(function (response) {
+        return response.json().then(function (data) {
+          if (!response.ok) throw new Error(data.error || ('HTTP '+response.status));
+          return data;
+        });
+      });
+    }

+    function createPostForm(label, tool, id) {
      var form = document.createElement('form');
      form.method = 'post';
+      form.style.display = 'inline';
+      form.innerHTML = '<input type="hidden" name="pwg_token" value="'+escapeHtml(pwgToken)+'">'
+        + '<input type="hidden" name="connection_id" value="'+escapeHtml(id)+'">'
+        + '<button class="buttonLike" type="submit" name="bratonien_tool" value="'+escapeHtml(tool)+'">'+escapeHtml(label)+'</button>';
+      return form;
+    }

-      var token = document.createElement('input');
-      token.type = 'hidden';
-      token.name = 'pwg_token';
-      token.value = tokenInput.value;
-      form.appendChild(token);
+    function dialog() {
+      var node = document.getElementById('bratonien-nc-connection-edit-v2');
+      if (node) return node;
+      node = document.createElement('dialog');
+      node.id = 'bratonien-nc-connection-edit-v2';
+      node.className = 'bratonien-edit-dialog';
+      node.innerHTML = '<div class="bratonien-edit-dialog__body">'
+        + '<div style="display:flex;align-items:flex-start;justify-content:space-between;gap:1rem">'
+        + '<div><h4 style="margin:0">Verbindung bearbeiten</h4><p class="bratonien-base-note" style="margin:.35rem 0 0">Die Einstellungen gelten nur für diese Verbindung.</p></div>'
+        + '<button type="button" class="buttonLike" data-edit-close>Schließen</button></div>'
+        + '<div data-edit-content style="margin-top:1rem"></div></div>';
+      document.body.appendChild(node);
+      node.querySelector('[data-edit-close]').addEventListener('click', function () { node.close(); });
+      node.addEventListener('click', function (event) { if (event.target === node) node.close(); });
+      return node;
+    }

-      var connection = document.createElement('input');
-      connection.type = 'hidden';
-      connection.name = 'connection_id';
-      connection.value = connectionInput.value;
-      form.appendChild(connection);
+    function storageRow(storage) {
+      storage = storage || {};
+      return '<div class="bratonien-storage-row" data-storage-row>'
+        + '<label>Storage-ID<input name="nc_storage_id[]" value="'+escapeHtml(storage.storage_id || '')+'" required></label>'
+        + '<label>Quellordner<input name="nc_source_prefix[]" value="'+escapeHtml(storage.source_prefix || '')+'" placeholder="optional"></label>'
+        + '<label>Lokaler Speicherpfad<input name="nc_local_mount[]" value="'+escapeHtml(storage.local_mount || '')+'" required></label>'
+        + '<button type="button" class="buttonLike" data-remove-storage>Entfernen</button></div>';
+    }

-      var button = document.createElement('button');
-      button.className = 'buttonLike';
-      button.type = 'submit';
-      button.name = 'bratonien_tool';
-      button.value = 'nc_connector_run_now';
-      button.textContent = 'Jetzt abgleichen';
-      form.appendChild(button);
+    function showError(form, data) {
+      var old = form.querySelector('[data-edit-error]');
+      if (old) old.remove();
+      var box = document.createElement('div');
+      box.dataset.editError = '1';
+      box.className = 'bratonien-main-cache__warning';
+      box.style.margin = '0 0 1rem';
+      box.textContent = (data && data.message) ? data.message : 'Die Verbindung konnte nicht gespeichert werden.';
+      form.insertBefore(box, form.firstChild);
+    }

-      actions.insertBefore(form, actions.firstChild);
+    function submitLocal(form, editDialog) {
+      if (!form.reportValidity()) return;
+      var button = form.querySelector('button[type="submit"]');
+      if (button) button.disabled = true;
+      fetch('plugins/bratonien_tools/nc-connector-edit-save.php', {
+        method:'POST', credentials:'same-origin', cache:'no-store', headers:{'Accept':'application/json'}, body:new FormData(form)
+      }).then(function (response) {
+        return response.json().then(function (data) {
+          if (!response.ok || !data.ok) { showError(form, data); return; }
+          editDialog.close();
+          window.location.reload();
+        });
+      }).catch(function (error) {
+        showError(form, {message:error.message || String(error)});
+      }).finally(function () {
+        if (button) button.disabled = false;
+      });
+    }
+
+    function openLocalEditor(id) {
+      var editDialog = dialog();
+      var content = editDialog.querySelector('[data-edit-content]');
+      content.innerHTML = '<p class="bratonien-base-note">Verbindung wird geladen …</p>';
+      if (typeof editDialog.showModal === 'function') editDialog.showModal();
+      else editDialog.setAttribute('open', 'open');
+
+      loadConnection(id).then(function (data) {
+        if (data.adapter !== 'local') throw new Error('Diese Verbindung wird über den WebDAV-Assistenten bearbeitet.');
+        var legacy = data.legacy || {};
+        var webdav = data.webdav || {};
+        var storages = Array.isArray(legacy.storages) ? legacy.storages : [];
+        var rows = storages.map(storageRow).join('') || storageRow({});
+
+        content.innerHTML = '<form method="post" data-edit-form>'
+          + '<input type="hidden" name="pwg_token" value="'+escapeHtml(pwgToken)+'">'
+          + '<input type="hidden" name="connection_id" value="'+escapeHtml(data.id)+'">'
+          + '<h5>Verbindung</h5><div class="bratonien-form-grid">'
+          + '<label class="bratonien-label">Name</label><input name="connection_name" value="'+escapeHtml(data.name)+'" required>'
+          + '</div>'
+          + '<h5 style="margin-top:1.2rem">Nextcloud</h5><div class="bratonien-form-grid">'
+          + '<label class="bratonien-label">Nextcloud-Adresse</label><input name="nc_nextcloud_url" value="'+escapeHtml(webdav.nextcloud_url || '')+'">'
+          + '<label class="bratonien-label">Nextcloud-Benutzer</label><input name="nc_nextcloud_user" value="'+escapeHtml(webdav.nextcloud_user || '')+'" autocomplete="username">'
+          + '<label class="bratonien-label">Nextcloud-Passwort</label><input name="nc_nextcloud_password" type="password" autocomplete="current-password" placeholder="'+(webdav.has_nextcloud_password ? 'gespeichert – leer = unverändert' : 'noch nicht gespeichert')+'">'
+          + '</div>'
+          + '<h5 style="margin-top:1.2rem">Piwigo-Zugang</h5><div class="bratonien-form-grid">'
+          + '<label class="bratonien-label">API-Schlüssel-ID</label><input name="nc_connection_api_key_id" value="'+escapeHtml(webdav.api_key_id || '')+'" autocomplete="off">'
+          + '<label class="bratonien-label">API-Geheimnis</label><input name="nc_connection_api_key_secret" type="password" autocomplete="new-password" placeholder="'+(webdav.has_api_key_secret ? 'gespeichert – leer = unverändert' : 'noch nicht gespeichert')+'">'
+          + '<label class="bratonien-label">Fallback-Benutzer</label><input name="nc_fallback_user" value="'+escapeHtml(webdav.fallback_user || '')+'" autocomplete="username">'
+          + '<label class="bratonien-label">Fallback-Passwort</label><input name="nc_fallback_password" type="password" autocomplete="current-password" placeholder="'+(webdav.has_fallback_password ? 'gespeichert – leer = unverändert' : 'noch nicht gespeichert')+'">'
+          + '</div>'
+          + '<h5 style="margin-top:1.2rem">Lokaler Connector</h5><div class="bratonien-form-grid">'
+          + '<label class="bratonien-label">Datenbank-Server</label><input name="nc_host" value="'+escapeHtml(legacy.host)+'" required>'
+          + '<label class="bratonien-label">Port</label><input name="nc_port" type="number" min="1" max="65535" value="'+escapeHtml(legacy.port || 5432)+'" required>'
+          + '<label class="bratonien-label">Datenbank</label><input name="nc_database" value="'+escapeHtml(legacy.database)+'" required>'
+          + '<label class="bratonien-label">Reader-Benutzer</label><input name="nc_user" value="'+escapeHtml(legacy.user)+'" required>'
+          + '<label class="bratonien-label">Reader-Passwort</label><input name="nc_db_password" type="password" autocomplete="new-password" placeholder="'+(legacy.has_db_password ? 'gespeichert – leer = unverändert' : 'noch nicht gespeichert')+'">'
+          + '</div>'
+          + '<h5 style="margin-top:1.2rem">Speicherorte</h5><div data-storage-list>'+rows+'</div>'
+          + '<button type="button" class="buttonLike" data-add-storage>Speicherort hinzufügen</button>'
+          + '<details style="margin-top:1rem"><summary>Erweiterte Einstellungen</summary><div class="bratonien-form-grid" style="margin-top:.75rem">'
+          + '<label class="bratonien-label">Source-View</label><input name="nc_source_view" value="'+escapeHtml(legacy.source_view)+'" required>'
+          + '<label class="bratonien-label">Activity-View</label><input name="nc_activity_view" value="'+escapeHtml(legacy.activity_view)+'" required>'
+          + '<label class="bratonien-label">Piwigo-Galerieordner</label><input name="nc_gallery_root" value="'+escapeHtml(legacy.gallery_root)+'" required>'
+          + '<label class="bratonien-label">Ruhezeit (Sek.)</label><input name="nc_quiet_seconds" type="number" min="0" value="'+escapeHtml(legacy.quiet_seconds)+'">'
+          + '<label class="bratonien-label">Maximale Wartezeit (Sek.)</label><input name="nc_max_wait_seconds" type="number" min="60" value="'+escapeHtml(legacy.max_wait_seconds)+'">'
+          + '<label class="bratonien-label">Vollprüfung nach (Sek.)</label><input name="nc_full_sync_seconds" type="number" min="300" value="'+escapeHtml(legacy.full_sync_seconds)+'">'
+          + '</div></details>'
+          + '<div class="bratonien-actions" style="margin-top:1rem"><button class="buttonLike" type="submit">Änderungen prüfen und speichern</button><button class="buttonLike" type="button" data-cancel>Abbrechen</button></div>'
+          + '</form>';
+
+        var form = content.querySelector('[data-edit-form]');
+        form.querySelector('[data-cancel]').addEventListener('click', function () { editDialog.close(); });
+        form.querySelector('[data-add-storage]').addEventListener('click', function () {
+          form.querySelector('[data-storage-list]').insertAdjacentHTML('beforeend', storageRow({}));
+        });
+        form.addEventListener('click', function (event) {
+          var remove = event.target.closest('[data-remove-storage]');
+          if (remove) {
+            var row = remove.closest('[data-storage-row]');
+            if (row) row.remove();
+          }
+        });
+        form.addEventListener('submit', function (event) {
+          event.preventDefault();
+          submitLocal(form, editDialog);
+        });
+      }).catch(function (error) {
+        content.innerHTML = '<p class="bratonien-main-cache__warning"><strong>Bearbeiten nicht möglich:</strong> '+escapeHtml(error.message || String(error))+'</p>';
+      });
+    }
+
+    [].slice.call(section.querySelectorAll('button[value="nc_connector_edit_start"]')).forEach(function (button) {
+      var form = button.closest('form');
+      if (form) form.remove();
    });
-  }

-  if (document.readyState === 'loading') {
-    document.addEventListener('DOMContentLoaded', restoreRunNowButtons);
-  } else {
-    restoreRunNowButtons();
-  }
+    [].slice.call(section.querySelectorAll('button[value="nc_connector_migrate_start"]')).forEach(function (button) {
+      var form = button.closest('form');
+      if (form) form.remove();
+    });
+
+    [].slice.call(section.querySelectorAll('button[value="nc_connector_delete"]')).forEach(function (deleteButton) {
+      var deleteForm = deleteButton.closest('form');
+      if (!deleteForm || !deleteForm.parentElement) return;
+      var idInput = deleteForm.querySelector('input[name="connection_id"]');
+      if (!idInput) return;
+      var id = idInput.value;
+      var actions = deleteForm.parentElement;
+
+      loadConnection(id).then(function (data) {
+        var edit;
+        if (data.adapter === 'local') {
+          edit = document.createElement('button');
+          edit.type = 'button';
+          edit.className = 'buttonLike';
+          edit.textContent = 'Bearbeiten';
+          edit.addEventListener('click', function () { openLocalEditor(id); });
+        } else {
+          edit = createPostForm('Bearbeiten', 'nc_connector_edit_start', id);
+        }
+        actions.insertBefore(edit, deleteForm);
+      }).catch(function (error) {
+        var info = document.createElement('span');
+        info.className = 'bratonien-main-cache__warning';
+        info.textContent = 'Verbindung konnte nicht geladen werden: '+(error.message || String(error));
+        actions.insertBefore(info, deleteForm);
+      });
+    });
+  });
 })();
--- a/main.inc.php
+++ b/main.inc.php
@@ -1,7 +1,7 @@
 <?php
 /*
 Plugin Name: Bratonien Tools
-Version: 0.9.7.22
+Version: 0.9.7.8
 Description: Erweiterbare Administrationswerkzeuge fuer die Bratonien-Piwigo-Installation.
 Plugin URI: https://github.com/Terranom674/Piwigo_Bratonien_Tools
 Author: Bratonien
@@ -17,6 +17,7 @@ define('BRATONIEN_TOOLS_PATH', PHPWG_PLUGINS_PATH . BRATONIEN_TOOLS_ID . '/');

 require_once(BRATONIEN_TOOLS_PATH . 'include/watermark_runtime.inc.php');
 require_once(BRATONIEN_TOOLS_PATH . 'include/webdav_image_runtime.inc.php');
+require_once(BRATONIEN_TOOLS_PATH . 'include/webdav_gallery_runtime.inc.php');
 require_once(BRATONIEN_TOOLS_PATH . 'include/public_selection.inc.php');
 require_once(BRATONIEN_TOOLS_PATH . 'include/picture_navigation.inc.php');
 require_once(BRATONIEN_TOOLS_PATH . 'include/batch_titles.inc.php');
@@ -29,7 +30,7 @@ require_once(BRATONIEN_TOOLS_PATH . 'include/nc_connector_scheduler.inc.php');
 add_event_handler('get_admin_plugin_menu_links', 'bratonien_tools_admin_menu');
 add_event_handler('get_derivative_url', 'bratonien_tools_filter_derivative_url', EVENT_HANDLER_PRIORITY_NEUTRAL, 4);
 add_event_handler('get_src_image_url', 'bratonien_tools_filter_webdav_src_url', EVENT_HANDLER_PRIORITY_NEUTRAL + 50, 2);
-add_event_handler('get_derivative_url', 'bratonien_tools_filter_webdav_derivative_url', EVENT_HANDLER_PRIORITY_NEUTRAL + 50, 4);
+add_event_handler('get_derivative_url', 'bratonien_tools_filter_webdav_gallery_derivative_url', EVENT_HANDLER_PRIORITY_NEUTRAL + 50, 4);
 add_event_handler('loc_end_element_set_global', 'bratonien_tools_batch_titles_register_action');
 add_event_handler('element_set_global_action', 'bratonien_tools_batch_titles_apply', EVENT_HANDLER_PRIORITY_NEUTRAL, 2);
 add_event_handler('init', 'bratonien_tools_prepare_connector_private_import', EVENT_HANDLER_PRIORITY_NEUTRAL - 30);
--- a/maintain.class.php
+++ b/maintain.class.php
@@ -9,6 +9,7 @@ require_once(dirname(__FILE__) . '/include/database.class.php');
 require_once(dirname(__FILE__) . '/tools/watermark_profiles.inc.php');
 require_once(dirname(__FILE__) . '/include/dependencies.inc.php');
 require_once(dirname(__FILE__) . '/include/nc_connector_scheduler.inc.php');
+require_once(dirname(__FILE__) . '/include/nc_legacy_reset.inc.php');

 class bratonien_tools_maintain extends PluginMaintain
 {
@@ -51,6 +52,18 @@ class bratonien_tools_maintain extends PluginMaintain
  public function update($old_version, $new_version, &$errors = array())
  {
    $this->prepare($errors);
+
+    if (version_compare((string)$old_version, '0.9.7.7', '<') && version_compare((string)$new_version, '0.9.7.7', '>='))
+    {
+      try
+      {
+        bratonien_tools_nc_reset_legacy_imports();
+      }
+      catch (Throwable $e)
+      {
+        $errors[] = 'Connector-Altbestand konnte nicht vollständig bereinigt werden: '.$e->getMessage();
+      }
+    }
  }

  public function uninstall()
--- a/nc-connector-edit-data.php
+++ b/nc-connector-edit-data.php
@@ -0,0 +1,93 @@
+<?php
+$piwigo_root = realpath(dirname(__DIR__, 2));
+if ($piwigo_root === false)
+{
+  http_response_code(500);
+  exit;
+}
+define('PHPWG_ROOT_PATH', rtrim($piwigo_root, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR);
+include_once(PHPWG_ROOT_PATH.'include/common.inc.php');
+
+header('Content-Type: application/json; charset=utf-8');
+header('Cache-Control: no-store, max-age=0');
+
+if (!defined('BRATONIEN_TOOLS_PATH'))
+{
+  http_response_code(404);
+  echo json_encode(array('error'=>'Bratonien Tools ist nicht aktiv.'));
+  exit;
+}
+if (!function_exists('is_admin') || !is_admin())
+{
+  http_response_code(403);
+  echo json_encode(array('error'=>'Administratorrechte erforderlich.'));
+  exit;
+}
+
+require_once(BRATONIEN_TOOLS_PATH.'include/nc_connector.inc.php');
+require_once(BRATONIEN_TOOLS_PATH.'include/nc_connector_manage.inc.php');
+require_once(BRATONIEN_TOOLS_PATH.'include/nc_connector_connection_scope.inc.php');
+
+$id = (int)($_GET['connection_id'] ?? 0);
+$connection = bratonien_tools_nc_connector_connection($id, true);
+if (!$connection)
+{
+  http_response_code(404);
+  echo json_encode(array('error'=>'Connector-Verbindung wurde nicht gefunden.'));
+  exit;
+}
+
+$config = isset($connection['config']) && is_array($connection['config']) ? $connection['config'] : array();
+$credentials = array();
+try
+{
+  $credentials = bratonien_tools_nc_connector_scoped_secret($connection);
+}
+catch (Throwable $e)
+{
+  $credentials = array();
+}
+
+$storages = array();
+foreach ((array)($config['storages'] ?? array()) as $storage)
+{
+  $storages[] = array(
+    'storage_id'=>(string)($storage['storage_id'] ?? ''),
+    'source_prefix'=>(string)($storage['source_prefix'] ?? ''),
+    'local_mount'=>(string)($storage['local_mount'] ?? ''),
+  );
+}
+
+$payload = array(
+  'id'=>(int)$connection['id'],
+  'name'=>(string)$connection['name'],
+  'adapter'=>(string)$connection['adapter'],
+  'enabled'=>(bool)$connection['enabled'],
+  'takeover_state'=>(string)$connection['takeover_state'],
+  'source_mode'=>(string)($config['source_mode'] ?? ''),
+  'legacy'=>array(
+    'host'=>(string)($config['host'] ?? ''),
+    'port'=>(string)($config['port'] ?? '5432'),
+    'database'=>(string)($config['database'] ?? ''),
+    'user'=>(string)($config['user'] ?? ''),
+    'has_db_password'=>trim((string)($credentials['db_password'] ?? '')) !== '',
+    'source_view'=>(string)($config['source_view'] ?? ''),
+    'activity_view'=>(string)($config['activity_view'] ?? ''),
+    'gallery_root'=>(string)($config['gallery_root'] ?? ''),
+    'quiet_seconds'=>(int)($config['quiet_seconds'] ?? 120),
+    'max_wait_seconds'=>(int)($config['max_wait_seconds'] ?? 900),
+    'full_sync_seconds'=>(int)($config['full_sync_seconds'] ?? 86400),
+    'storages'=>$storages,
+  ),
+  'webdav'=>array(
+    'nextcloud_url'=>(string)($config['nextcloud_url'] ?? ''),
+    'nextcloud_user'=>(string)($credentials['nextcloud_user'] ?? $config['nextcloud_access_user'] ?? $config['access_user'] ?? ''),
+    'has_nextcloud_password'=>(string)($credentials['nextcloud_password'] ?? '') !== '',
+    'api_key_id'=>(string)($credentials['api_key_id'] ?? ''),
+    'has_api_key_secret'=>trim((string)($credentials['api_key_secret'] ?? '')) !== '',
+    'fallback_user'=>(string)($credentials['piwigo_user'] ?? ''),
+    'has_fallback_password'=>(string)($credentials['piwigo_password'] ?? '') !== '',
+  ),
+);
+
+echo json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
--- a/nc-connector-edit-save.php
+++ b/nc-connector-edit-save.php
@@ -0,0 +1,356 @@
+<?php
+$piwigo_root = realpath(dirname(__DIR__, 2));
+if ($piwigo_root === false)
+{
+  http_response_code(500);
+  exit;
+}
+define('PHPWG_ROOT_PATH', rtrim($piwigo_root, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR);
+include_once(PHPWG_ROOT_PATH.'include/common.inc.php');
+
+header('Content-Type: application/json; charset=utf-8');
+header('Cache-Control: no-store, max-age=0');
+
+function bratonien_tools_nc_edit_json($status, array $payload)
+{
+  http_response_code((int)$status);
+  echo json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+  exit;
+}
+
+function bratonien_tools_nc_edit_fail($message, array $fields = array(), $stage = '', $detail = '')
+{
+  $visible = trim((string)$message);
+  if ($stage !== '') $visible = 'Bereich: '.$stage.' — '.$visible;
+  if ($detail !== '') $visible .= ' Technische Ursache: '.$detail;
+
+  bratonien_tools_nc_edit_json(422, array(
+    'ok'=>false,
+    'message'=>$visible,
+    'stage'=>(string)$stage,
+    'detail'=>(string)$detail,
+    'fields'=>array_values(array_unique($fields)),
+  ));
+}
+
+function bratonien_tools_nc_edit_probe($url, $username = '', $password = '', array $headers = array())
+{
+  if (!function_exists('curl_init'))
+  {
+    return array('ok'=>false, 'http'=>0, 'errno'=>-1, 'error'=>'cURL ist in PHP nicht verfügbar.', 'body'=>'');
+  }
+
+  $ch = curl_init($url);
+  $options = array(
+    CURLOPT_RETURNTRANSFER=>true,
+    CURLOPT_FOLLOWLOCATION=>true,
+    CURLOPT_MAXREDIRS=>3,
+    CURLOPT_CONNECTTIMEOUT=>8,
+    CURLOPT_TIMEOUT=>15,
+    CURLOPT_HTTPHEADER=>array_merge(array('Accept: application/json'), $headers),
+    CURLOPT_USERAGENT=>'Bratonien-Tools-NC-Editor/'.(function_exists('bratonien_tools_current_version') ? bratonien_tools_current_version() : 'dev'),
+  );
+  if ($username !== '')
+  {
+    $options[CURLOPT_HTTPAUTH] = CURLAUTH_BASIC;
+    $options[CURLOPT_USERPWD] = $username.':'.$password;
+  }
+  curl_setopt_array($ch, $options);
+  $body = curl_exec($ch);
+  $errno = curl_errno($ch);
+  $error = curl_error($ch);
+  $http = (int)curl_getinfo($ch, CURLINFO_HTTP_CODE);
+  curl_close($ch);
+
+  return array(
+    'ok'=>$body !== false && $errno === 0,
+    'http'=>$http,
+    'errno'=>$errno,
+    'error'=>$error,
+    'body'=>$body === false ? '' : (string)$body,
+  );
+}
+
+if (!defined('BRATONIEN_TOOLS_PATH'))
+{
+  bratonien_tools_nc_edit_json(404, array('ok'=>false, 'message'=>'Bratonien Tools ist nicht aktiv.', 'fields'=>array()));
+}
+if (!function_exists('is_admin') || !is_admin())
+{
+  bratonien_tools_nc_edit_json(403, array('ok'=>false, 'message'=>'Administratorrechte erforderlich.', 'fields'=>array()));
+}
+if (($_SERVER['REQUEST_METHOD'] ?? '') !== 'POST')
+{
+  bratonien_tools_nc_edit_json(405, array('ok'=>false, 'message'=>'Nur POST ist erlaubt.', 'fields'=>array()));
+}
+
+try
+{
+  check_pwg_token();
+  require_once(BRATONIEN_TOOLS_PATH.'include/tool_registry.inc.php');
+
+  $id = (int)($_POST['connection_id'] ?? 0);
+  $connection = bratonien_tools_nc_connector_connection($id, true);
+  if (!$connection)
+  {
+    bratonien_tools_nc_edit_fail('Die zu bearbeitende Verbindung wurde nicht gefunden.', array(), 'Verbindung');
+  }
+
+  $config = isset($connection['config']) && is_array($connection['config']) ? $connection['config'] : array();
+  $credentials = bratonien_tools_nc_connector_scoped_secret($connection);
+
+  $nextcloud_input = trim((string)($_POST['nc_nextcloud_url'] ?? ($config['nextcloud_url'] ?? '')));
+  $nextcloud_user = trim((string)($_POST['nc_nextcloud_user'] ?? ($credentials['nextcloud_user'] ?? '')));
+  $submitted_nc_password = (string)($_POST['nc_nextcloud_password'] ?? '');
+  $nextcloud_password = $submitted_nc_password !== '' ? $submitted_nc_password : (string)($credentials['nextcloud_password'] ?? '');
+
+  $has_any_nextcloud = $nextcloud_input !== '' || $nextcloud_user !== '' || $nextcloud_password !== '';
+  if ($has_any_nextcloud)
+  {
+    $missing = array();
+    if ($nextcloud_input === '') $missing[] = 'nc_nextcloud_url';
+    if ($nextcloud_user === '') $missing[] = 'nc_nextcloud_user';
+    if ($nextcloud_password === '') $missing[] = 'nc_nextcloud_password';
+    if ($missing)
+    {
+      bratonien_tools_nc_edit_fail(
+        'Die WebDAV-Daten sind unvollständig. Adresse, Benutzer und Passwort werden gemeinsam benötigt.',
+        $missing,
+        'Nextcloud / WebDAV'
+      );
+    }
+
+    try
+    {
+      $candidate_urls = bratonien_tools_nc_wizard_candidate_urls($nextcloud_input);
+    }
+    catch (Throwable $e)
+    {
+      bratonien_tools_nc_edit_fail($e->getMessage(), array('nc_nextcloud_url'), 'Nextcloud / WebDAV');
+    }
+
+    $nextcloud_url = '';
+    $last_probe = null;
+    $last_status_url = '';
+    foreach ($candidate_urls as $candidate_url)
+    {
+      $status_url = $candidate_url.'/status.php';
+      $probe = bratonien_tools_nc_edit_probe($status_url);
+      $last_probe = $probe;
+      $last_status_url = $status_url;
+
+      if (!$probe['ok'] || $probe['http'] < 200 || $probe['http'] >= 300)
+      {
+        continue;
+      }
+
+      $status = json_decode($probe['body'], true);
+      if (!is_array($status) || empty($status['installed']))
+      {
+        continue;
+      }
+
+      $nextcloud_url = $candidate_url;
+      break;
+    }
+
+    if ($nextcloud_url === '')
+    {
+      $attempts = array();
+      foreach ($candidate_urls as $candidate_url)
+      {
+        $attempts[] = $candidate_url.'/status.php';
+      }
+      if (is_array($last_probe) && !$last_probe['ok'])
+      {
+        $technical = $last_probe['errno'] >= 0
+          ? 'cURL '.$last_probe['errno'].($last_probe['error'] !== '' ? ': '.$last_probe['error'] : '')
+          : $last_probe['error'];
+        bratonien_tools_nc_edit_fail(
+          'Die Nextcloud-Adresse ist vom Piwigo-Server aus nicht erreichbar. Ohne angegebenes Protokoll wurden HTTPS und HTTP geprüft.',
+          array('nc_nextcloud_url'),
+          'Nextcloud / WebDAV – Erreichbarkeit',
+          $technical.' · Geprüft: '.implode(' ; ', $attempts)
+        );
+      }
+
+      bratonien_tools_nc_edit_fail(
+        'Unter der angegebenen Adresse wurde keine erreichbare installierte Nextcloud gefunden. Ohne angegebenes Protokoll wurden HTTPS und HTTP geprüft.',
+        array('nc_nextcloud_url'),
+        'Nextcloud / WebDAV – Erkennung',
+        'Geprüft: '.implode(' ; ', $attempts).($last_probe ? ' · Letzter HTTP-Status: '.$last_probe['http'] : '')
+      );
+    }
+
+    $_POST['nc_nextcloud_url'] = $nextcloud_url;
+
+    $user_url = $nextcloud_url.'/ocs/v2.php/cloud/user?format=json';
+    $user_probe = bratonien_tools_nc_edit_probe($user_url, $nextcloud_user, $nextcloud_password, array('OCS-APIRequest: true'));
+    if (!$user_probe['ok'])
+    {
+      $technical = $user_probe['errno'] >= 0
+        ? 'cURL '.$user_probe['errno'].($user_probe['error'] !== '' ? ': '.$user_probe['error'] : '')
+        : $user_probe['error'];
+      bratonien_tools_nc_edit_fail(
+        'Die Nextcloud-Anmeldung konnte technisch nicht geprüft werden.',
+        array('nc_nextcloud_url','nc_nextcloud_user','nc_nextcloud_password'),
+        'Nextcloud / WebDAV – Anmeldung',
+        $technical.' · Ziel: '.$user_url
+      );
+    }
+    if ($user_probe['http'] === 401 || $user_probe['http'] === 403)
+    {
+      bratonien_tools_nc_edit_fail(
+        'Nextcloud hat Benutzername oder Passwort abgelehnt.',
+        array('nc_nextcloud_user','nc_nextcloud_password'),
+        'Nextcloud / WebDAV – Anmeldung',
+        'HTTP '.$user_probe['http']
+      );
+    }
+    if ($user_probe['http'] < 200 || $user_probe['http'] >= 300)
+    {
+      bratonien_tools_nc_edit_fail(
+        'Nextcloud ist erreichbar, aber die Benutzerprüfung wurde vom Server abgelehnt.',
+        array('nc_nextcloud_user','nc_nextcloud_password'),
+        'Nextcloud / WebDAV – Anmeldung',
+        'HTTP '.$user_probe['http'].' · Ziel: '.$user_url
+      );
+    }
+    try
+    {
+      bratonien_tools_nc_wizard_ocs_data($user_probe['body']);
+    }
+    catch (Throwable $e)
+    {
+      bratonien_tools_nc_edit_fail(
+        'Nextcloud antwortet auf die Benutzerprüfung, die Antwort ist aber nicht gültig: '.$e->getMessage(),
+        array('nc_nextcloud_user','nc_nextcloud_password'),
+        'Nextcloud / WebDAV – Anmeldung'
+      );
+    }
+  }
+
+  $api_key_id = trim((string)($_POST['nc_connection_api_key_id'] ?? ($credentials['api_key_id'] ?? '')));
+  $submitted_api_secret = trim((string)($_POST['nc_connection_api_key_secret'] ?? ''));
+  $api_key_secret = $submitted_api_secret !== '' ? $submitted_api_secret : trim((string)($credentials['api_key_secret'] ?? ''));
+  if (($api_key_id === '') !== ($api_key_secret === ''))
+  {
+    $missing = $api_key_id === '' ? array('nc_connection_api_key_id') : array('nc_connection_api_key_secret');
+    bratonien_tools_nc_edit_fail(
+      'API-Schlüssel-ID und API-Geheimnis müssen gemeinsam vollständig sein.',
+      $missing,
+      'Piwigo API'
+    );
+  }
+  if ($api_key_id !== '')
+  {
+    try
+    {
+      bratonien_tools_nc_connector_validate_scoped_api($api_key_id, $api_key_secret);
+    }
+    catch (Throwable $e)
+    {
+      bratonien_tools_nc_edit_fail(
+        'Der Piwigo-API-Zugang konnte nicht bestätigt werden: '.$e->getMessage(),
+        array('nc_connection_api_key_id','nc_connection_api_key_secret'),
+        'Piwigo API'
+      );
+    }
+  }
+
+  $fallback_user = trim((string)($_POST['nc_fallback_user'] ?? ($credentials['piwigo_user'] ?? '')));
+  $submitted_fallback_password = (string)($_POST['nc_fallback_password'] ?? '');
+  $fallback_password = $submitted_fallback_password !== '' ? $submitted_fallback_password : (string)($credentials['piwigo_password'] ?? '');
+  if (($fallback_user === '') !== ($fallback_password === ''))
+  {
+    bratonien_tools_nc_edit_fail(
+      'Fallback-Benutzer und Fallback-Passwort müssen gemeinsam vollständig sein.',
+      array('nc_fallback_user','nc_fallback_password'),
+      'Piwigo-Fallback'
+    );
+  }
+  if ($fallback_user !== '')
+  {
+    try
+    {
+      bratonien_tools_nc_connector_validate_fallback_credentials($fallback_user, $fallback_password);
+    }
+    catch (Throwable $e)
+    {
+      bratonien_tools_nc_edit_fail(
+        'Der Piwigo-Fallback wurde abgelehnt: '.$e->getMessage(),
+        array('nc_fallback_user','nc_fallback_password'),
+        'Piwigo-Fallback'
+      );
+    }
+  }
+
+  $result = bratonien_tools_nc_connector_update_local_friendly();
+
+  if (array_key_exists('nc_fallback_user', $_POST) || array_key_exists('nc_fallback_password', $_POST))
+  {
+    $updated = bratonien_tools_nc_connector_connection($id, true);
+    if (!$updated) throw new RuntimeException('Die Verbindung konnte nach dem Speichern nicht erneut geladen werden.');
+    $updated_credentials = bratonien_tools_nc_connector_scoped_secret($updated);
+    $updated_credentials['piwigo_user'] = $fallback_user;
+    $updated_credentials['piwigo_password'] = $fallback_password;
+    bratonien_tools_nc_connector_store_scoped_secret($id, $updated, $updated_credentials);
+  }
+
+  bratonien_tools_nc_edit_json(200, array(
+    'ok'=>true,
+    'message'=>(string)($result['message'] ?? 'Verbindung wurde gespeichert.'),
+    'fields'=>array(),
+  ));
+}
+catch (Throwable $e)
+{
+  $message = trim($e->getMessage());
+  if ($message === '') $message = 'Die Verbindung konnte nicht gespeichert werden.';
+
+  $fields = array();
+  $stage = 'Verbindung';
+  $add = function($name) use (&$fields)
+  {
+    if (!in_array($name, $fields, true)) $fields[] = $name;
+  };
+
+  if (stripos($message, 'Name') !== false && stripos($message, 'Datenbankname') === false) $add('connection_name');
+  if (stripos($message, 'Datenbank-Server') !== false) { $add('nc_host'); $stage = 'Legacy-Datenbank'; }
+  if (stripos($message, 'Datenbank-Port') !== false) { $add('nc_port'); $stage = 'Legacy-Datenbank'; }
+  if (stripos($message, 'Datenbankname') !== false) { $add('nc_database'); $stage = 'Legacy-Datenbank'; }
+  if (stripos($message, 'Reader-Benutzer') !== false) { $add('nc_user'); $stage = 'Legacy-Datenbank'; }
+  if (stripos($message, 'Datenbankpasswort') !== false) { $add('nc_db_password'); $stage = 'Legacy-Datenbank'; }
+  if (stripos($message, 'Storage-ID') !== false) { $add('nc_storage_id[]'); $stage = 'Speicherorte'; }
+  if (stripos($message, 'lokaler Pfad') !== false || stripos($message, 'Speicherort') !== false) { $add('nc_local_mount[]'); $stage = 'Speicherorte'; }
+  if (stripos($message, 'Galerieordner') !== false) { $add('nc_gallery_root'); $stage = 'Erweiterte Legacy-Einstellungen'; }
+  if (stripos($message, 'Datenbankansichten') !== false || stripos($message, 'Source-View') !== false) { $add('nc_source_view'); $stage = 'Erweiterte Legacy-Einstellungen'; }
+  if (stripos($message, 'Datenbankansichten') !== false || stripos($message, 'Activity-View') !== false) { $add('nc_activity_view'); $stage = 'Erweiterte Legacy-Einstellungen'; }
+
+  if (stripos($message, 'Nextcloud') !== false)
+  {
+    $stage = 'Nextcloud / WebDAV';
+    if (stripos($message, 'Adresse') !== false) $add('nc_nextcloud_url');
+    if (stripos($message, 'Benutzer') !== false) $add('nc_nextcloud_user');
+    if (stripos($message, 'Passwort') !== false) $add('nc_nextcloud_password');
+  }
+  if (stripos($message, 'API') !== false)
+  {
+    $stage = 'Piwigo API';
+    $add('nc_connection_api_key_id');
+    $add('nc_connection_api_key_secret');
+  }
+  if (stripos($message, 'Fallback') !== false)
+  {
+    $stage = 'Piwigo-Fallback';
+    $add('nc_fallback_user');
+    $add('nc_fallback_password');
+  }
+
+  bratonien_tools_nc_edit_fail(
+    $message,
+    $fields,
+    $stage,
+    'Interne Prüfung: '.get_class($e)
+  );
+}
--- a/nc-connector-source-picker-start.php
+++ b/nc-connector-source-picker-start.php
@@ -0,0 +1,104 @@
+<?php
+$piwigo_root = realpath(dirname(__DIR__, 2));
+if ($piwigo_root === false)
+{
+  http_response_code(500);
+  exit;
+}
+define('PHPWG_ROOT_PATH', rtrim($piwigo_root, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR);
+include_once(PHPWG_ROOT_PATH.'include/common.inc.php');
+
+header('Content-Type: application/json; charset=utf-8');
+header('Cache-Control: no-store, max-age=0');
+
+function bratonien_tools_nc_source_picker_json($status, array $payload)
+{
+  http_response_code((int)$status);
+  echo json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+  exit;
+}
+
+function bratonien_tools_nc_source_picker_fail($message, array $fields = array())
+{
+  bratonien_tools_nc_source_picker_json(422, array(
+    'ok'=>false,
+    'message'=>(string)$message,
+    'fields'=>array_values(array_unique($fields)),
+  ));
+}
+
+if (!defined('BRATONIEN_TOOLS_PATH'))
+{
+  bratonien_tools_nc_source_picker_json(404, array('ok'=>false, 'message'=>'Bratonien Tools ist nicht aktiv.', 'fields'=>array()));
+}
+if (!function_exists('is_admin') || !is_admin())
+{
+  bratonien_tools_nc_source_picker_json(403, array('ok'=>false, 'message'=>'Administratorrechte erforderlich.', 'fields'=>array()));
+}
+if (($_SERVER['REQUEST_METHOD'] ?? '') !== 'POST')
+{
+  bratonien_tools_nc_source_picker_json(405, array('ok'=>false, 'message'=>'Nur POST ist erlaubt.', 'fields'=>array()));
+}
+
+try
+{
+  check_pwg_token();
+  require_once(BRATONIEN_TOOLS_PATH.'include/tool_registry.inc.php');
+
+  $id = (int)($_POST['connection_id'] ?? 0);
+  $connection = bratonien_tools_nc_connector_connection($id, true);
+  if (!$connection)
+  {
+    bratonien_tools_nc_source_picker_fail('Die zu bearbeitende Verbindung wurde nicht gefunden.');
+  }
+  if ((string)$connection['adapter'] !== 'local')
+  {
+    bratonien_tools_nc_source_picker_fail('Die automatische Migrationsauswahl ist nur für die bestehende Legacy-Verbindung vorgesehen.');
+  }
+
+  $config = isset($connection['config']) && is_array($connection['config']) ? $connection['config'] : array();
+  $credentials = bratonien_tools_nc_connector_scoped_secret($connection);
+
+  $base_url = trim((string)($config['nextcloud_url'] ?? ''));
+  $username = trim((string)($credentials['nextcloud_user'] ?? ''));
+  $password = (string)($credentials['nextcloud_password'] ?? '');
+
+  $missing = array();
+  if ($base_url === '') $missing[] = 'nc_nextcloud_url';
+  if ($username === '') $missing[] = 'nc_nextcloud_user';
+  if ($password === '') $missing[] = 'nc_nextcloud_password';
+  if ($missing)
+  {
+    bratonien_tools_nc_source_picker_fail(
+      'Für die automatische Ordnerauswahl müssen Nextcloud-Adresse, Benutzer und Passwort gespeichert sein.',
+      $missing
+    );
+  }
+
+  bratonien_tools_nc_connector_prepare_webdav_wizard_from_connection($connection, 'migrate');
+
+  $state = bratonien_tools_nc_wizard_state();
+  if ((int)($state['step'] ?? 0) !== 2 || empty($state['scan_ok']) || empty($state['directory_selection_ready']))
+  {
+    $detail = trim((string)($state['technical_error'] ?? ''));
+    bratonien_tools_nc_source_picker_fail(
+      $detail !== '' ? 'Die Nextcloud-Ordner konnten nicht geladen werden: '.$detail : 'Die Nextcloud-Ordner konnten nicht geladen werden.',
+      array('nc_nextcloud_url','nc_nextcloud_user','nc_nextcloud_password')
+    );
+  }
+
+  bratonien_tools_nc_source_picker_json(200, array(
+    'ok'=>true,
+    'message'=>'Nextcloud-Ordner wurden geladen. Die Auswahl wird geöffnet.',
+    'fields'=>array(),
+  ));
+}
+catch (Throwable $e)
+{
+  $message = trim($e->getMessage());
+  if ($message === '') $message = 'Die Nextcloud-Ordnerauswahl konnte nicht vorbereitet werden.';
+  bratonien_tools_nc_source_picker_fail(
+    $message,
+    array('nc_nextcloud_url','nc_nextcloud_user','nc_nextcloud_password')
+  );
+}
--- a/runtime/build-webdav-media.sh
+++ b/runtime/build-webdav-media.sh
@@ -1,7 +1,35 @@
 #!/usr/bin/env bash
 set -Eeuo pipefail

-# Seit 0.9.7.20 greift der NC Connector nicht mehr in Piwigos Bild-/Derivatlogik ein.
-# Der Shadowtree dient nur der Piwigo-Synchronisation; die Bild-URL wird zur Laufzeit
-# ueber den bestehenden WebDAV-URL-Hook auf Nextcloud aufgeloest.
-exit 0
+CONFIG_FILE="${PIWIGO_CONFIG:-}"
+[[ -n "$CONFIG_FILE" && -r "$CONFIG_FILE" ]] || { echo "WebDAV-Konfiguration fehlt: ${CONFIG_FILE:-<leer>}" >&2; exit 1; }
+
+# shellcheck source=/dev/null
+source "$CONFIG_FILE"
+
+: "${PIWIGO_ROOT:?PIWIGO_ROOT fehlt}"
+: "${CONNECTION_ID:?CONNECTION_ID fehlt}"
+: "${WEBDAV_BASE_URL:?WEBDAV_BASE_URL fehlt}"
+: "${WEBDAV_USER:?WEBDAV_USER fehlt}"
+: "${WEBDAV_PASSWORD_FILE:?WEBDAV_PASSWORD_FILE fehlt}"
+: "${WEBDAV_MAPPING_FILE:?WEBDAV_MAPPING_FILE fehlt}"
+: "${STATE_DIR:?STATE_DIR fehlt}"
+
+SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+LOCK_FILE="$STATE_DIR/webdav-media.lock"
+mkdir -p -- "$STATE_DIR"
+exec 9>"$LOCK_FILE"
+flock -n 9 || exit 0
+
+PREVIEW_CACHE="$PIWIGO_ROOT/_data/bratonien-tools/nc-webdav-preview/connection-$CONNECTION_ID"
+
+php "$SCRIPT_DIR/lib/precache-webdav-previews.php" \
+    --mapping="$WEBDAV_MAPPING_FILE" \
+    --base-url="$WEBDAV_BASE_URL" \
+    --user="$WEBDAV_USER" \
+    --password-file="$WEBDAV_PASSWORD_FILE" \
+    --cache-dir="$PREVIEW_CACHE"
+
+php "$SCRIPT_DIR/lib/build-webdav-derivatives.php" \
+    --piwigo-root="$PIWIGO_ROOT" \
+    --connection-id="$CONNECTION_ID"
--- a/runtime/cleanup-missing-webdav-images.php
+++ b/runtime/cleanup-missing-webdav-images.php
@@ -1,142 +0,0 @@
-#!/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);
-}
-
-$prefixes = array(
-  './_data/bratonien-tools/nc-webdav-gallery/connection-'.$connection_id.'/',
-  './_data/bratonien-tools/nc-webdav-source/connection-'.$connection_id.'/',
-  './galleries/bratonien-webdav-'.$connection_id.'/',
-);
-
-$gallery_root = rtrim(str_replace('\\', '/', (string)($config['parallel_gallery_root'] ?? '')), '/');
-$normalized_piwigo_root = rtrim(str_replace('\\', '/', $piwigo_root), '/');
-if ($gallery_root !== '' && strpos($gallery_root, $normalized_piwigo_root.'/') === 0)
-{
-  $relative = ltrim(substr($gallery_root, strlen($normalized_piwigo_root)), '/');
-  if ($relative !== '') $prefixes[] = './'.rtrim($relative, '/').'/';
-}
-$prefixes = array_values(array_unique($prefixes));
-
-$where = array();
-foreach ($prefixes as $prefix)
-{
-  $escaped = $db->real_escape_string(addcslashes($prefix, "_%\\"));
-  $where[] = "path LIKE '{$escaped}%' ESCAPE '\\\\'";
-}
-
-$images_table = $prefixeTable.'images';
-$rows = $db->query("SELECT id, path FROM `{$images_table}` WHERE ".implode(' OR ', $where));
-if (!$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'];
-  $owned = false;
-  foreach ($prefixes as $prefix)
-  {
-    if (strpos($path, $prefix) === 0)
-    {
-      $owned = true;
-      break;
-    }
-  }
-  if (!$owned) 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);
-}
-
-// Dieser Prozess wird ausschliesslich nach einem erfolgreich abgeschlossenen
-// WebDAV-Aufbau und erfolgreicher Piwigo-Synchronisierung gestartet. Eine
-// nicht erreichbare Verbindung kann deshalb niemals ueber diesen Pfad Bilder
-// entfernen.
-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'] = '';
-$_SERVER['HTTPS'] = 'off';
-
-require_once(PHPWG_ROOT_PATH.'include/common.inc.php');
-include_once(PHPWG_ROOT_PATH.'admin/include/functions.php');
-
-$deleted = delete_elements(array_values(array_unique(array_map('intval', $missing_ids))), false);
-update_category('all');
-invalidate_user_cache(true);
-
-echo 'WebDAV-Bereinigung: '.(int)$deleted." nicht mehr freigegebene/vorhandene Bilder aus Piwigo entfernt.\n";
--- a/runtime/cleanup-webdav-piwigo.php
+++ b/runtime/cleanup-webdav-piwigo.php
@@ -47,31 +47,24 @@ function bratonien_cleanup_tree($path, $allowed_root)
  @rmdir($path);
 }

-function bratonien_connection_id_from_owned_path($path)
+function bratonien_webdav_site_images($site_id)
 {
-  $path = (string)$path;
-  foreach (array(
-    '#^\./_data/bratonien-tools/nc-webdav-gallery/connection-([0-9]+)/#',
-    '#^\./_data/bratonien-tools/nc-webdav-source/connection-([0-9]+)/#',
-    '#^\./galleries/bratonien-webdav-([0-9]+)/#',
-  ) as $pattern)
+  $rows = array();
+  $query = '
+SELECT DISTINCT i.id, i.path, i.representative_ext
+  FROM '.IMAGES_TABLE.' AS i
+  LEFT JOIN '.CATEGORIES_TABLE.' AS sc ON sc.id = i.storage_category_id
+  LEFT JOIN '.IMAGE_CATEGORY_TABLE.' AS ic ON ic.image_id = i.id
+  LEFT JOIN '.CATEGORIES_TABLE.' AS vc ON vc.id = ic.category_id
+  WHERE sc.site_id = '.(int)$site_id.' OR vc.site_id = '.(int)$site_id.'
+;';
+  $result = pwg_query($query);
+  while ($row = pwg_db_fetch_assoc($result))
  {
-    if (preg_match($pattern, $path, $match)) return (int)$match[1];
+    $row['id'] = (int)$row['id'];
+    $rows[$row['id']] = $row;
  }
-  return 0;
-}
-
-function bratonien_connection_id_from_site_url($url)
-{
-  $url = (string)$url;
-  foreach (array(
-    '#^\./_data/bratonien-tools/nc-webdav-gallery/connection-([0-9]+)/$#',
-    '#^\./galleries/bratonien-webdav-([0-9]+)/$#',
-  ) as $pattern)
-  {
-    if (preg_match($pattern, $url, $match)) return (int)$match[1];
-  }
-  return 0;
+  return $rows;
 }

 try
@@ -91,24 +84,24 @@ try
    }
  }

-  $removed_images = 0;
-  $stale_by_connection = array();
+  $site_prefix = './_data/bratonien-tools/nc-webdav-gallery/connection-';
  $result = pwg_query(
-    "SELECT id, path, representative_ext FROM ".IMAGES_TABLE.
-    " WHERE path LIKE './_data/bratonien-tools/nc-webdav-gallery/connection-%'".
-    " OR path LIKE './_data/bratonien-tools/nc-webdav-source/connection-%'".
-    " OR path LIKE './galleries/bratonien-webdav-%'"
+    "SELECT id, galleries_url FROM ".SITES_TABLE.
+    " WHERE galleries_url LIKE '".pwg_db_real_escape_string($site_prefix)."%'"
  );
-  while ($row = pwg_db_fetch_assoc($result))
-  {
-    $connection_id = bratonien_connection_id_from_owned_path($row['path'] ?? '');
-    if ($connection_id < 1 || isset($active[$connection_id])) continue;
-    $row['id'] = (int)$row['id'];
-    $stale_by_connection[$connection_id][$row['id']] = $row;
-  }

-  foreach ($stale_by_connection as $connection_id=>$images)
+  $removed_sites = 0;
+  $removed_images = 0;
+  while ($site = pwg_db_fetch_assoc($result))
  {
+    $site_id = (int)$site['id'];
+    $site_url = (string)$site['galleries_url'];
+    if (!preg_match('#^\./_data/bratonien-tools/nc-webdav-gallery/connection-([0-9]+)/$#', $site_url, $match)) continue;
+
+    $connection_id = (int)$match[1];
+    if ($connection_id < 1 || isset($active[$connection_id])) continue;
+
+    $images = bratonien_webdav_site_images($site_id);
    foreach ($images as $row)
    {
      try
@@ -121,60 +114,48 @@ try
      }
    }

-    delete_elements(array_map('intval', array_keys($images)), false);
-    $removed_images += count($images);
-    echo 'NC WebDAV: entferne '.count($images).' verwaiste Bilder der gelöschten Verbindung '.$connection_id.".\n";
-  }
+    delete_site($site_id);

-  $removed_sites = 0;
-  $result = pwg_query('SELECT id, galleries_url FROM '.SITES_TABLE);
-  $stale_sites = array();
-  while ($site = pwg_db_fetch_assoc($result))
-  {
-    $connection_id = bratonien_connection_id_from_site_url($site['galleries_url'] ?? '');
-    if ($connection_id < 1 || isset($active[$connection_id])) continue;
-    $stale_sites[] = array('id'=>(int)$site['id'], 'connection_id'=>$connection_id);
-  }
+    if ($images)
+    {
+      $ids = array_keys($images);
+      $remaining = query2array(
+        'SELECT id FROM '.IMAGES_TABLE.' WHERE id IN ('.implode(',', array_map('intval', $ids)).')',
+        null,
+        'id'
+      );
+      if ($remaining)
+      {
+        delete_elements(array_map('intval', $remaining), false);
+      }
+    }

-  foreach ($stale_sites as $site)
-  {
-    delete_site($site['id']);
    $removed_sites++;
-    echo 'NC WebDAV: entferne verwaiste Piwigo-Site '.$site['id'].' der gelöschten Verbindung '.$site['connection_id'].".\n";
-  }
+    $removed_images += count($images);
+    echo 'NC WebDAV: entferne verwaiste Piwigo-Site '.$site_id.' für gelöschte Verbindung '.$connection_id.".\n";

-  $stale_connection_ids = array_unique(array_merge(
-    array_map('intval', array_keys($stale_by_connection)),
-    array_map(function($site) { return (int)$site['connection_id']; }, $stale_sites)
-  ));
-
-  $gallery_root = PHPWG_ROOT_PATH.'_data/bratonien-tools/nc-webdav-gallery';
-  $source_root = PHPWG_ROOT_PATH.'_data/bratonien-tools/nc-webdav-source';
-  $preview_root = PHPWG_ROOT_PATH.'_data/bratonien-tools/nc-webdav-preview';
-  $legacy_root = PHPWG_ROOT_PATH.'galleries';
-  $state_root = '/var/lib/bratonien-tools/nc-connector';
-  $status_root = PHPWG_ROOT_PATH.'_data/bratonien-tools/nc-connector-status';
-
-  foreach ($stale_connection_ids as $connection_id)
-  {
-    if ($connection_id < 1) continue;
+    $gallery_root = PHPWG_ROOT_PATH.'_data/bratonien-tools/nc-webdav-gallery';
+    $source_root = PHPWG_ROOT_PATH.'_data/bratonien-tools/nc-webdav-source';
+    $preview_root = PHPWG_ROOT_PATH.'_data/bratonien-tools/nc-webdav-preview';
    bratonien_cleanup_tree($gallery_root.'/connection-'.$connection_id, $gallery_root);
    bratonien_cleanup_tree($source_root.'/connection-'.$connection_id, $source_root);
    bratonien_cleanup_tree($preview_root.'/connection-'.$connection_id, $preview_root);
-    bratonien_cleanup_tree($legacy_root.'/bratonien-webdav-'.$connection_id, $legacy_root);
+
+    $state_root = '/var/lib/bratonien-tools/nc-connector';
    bratonien_cleanup_tree($state_root.'/connection-'.$connection_id, $state_root);

    foreach (glob('/etc/bratonien-tools/nc-connector/webdav-connection-'.$connection_id.'.*') ?: array() as $file)
    {
      @unlink($file);
    }
+
+    $status_root = PHPWG_ROOT_PATH.'_data/bratonien-tools/nc-connector-status';
    @unlink($status_root.'/connection-'.$connection_id.'.json');
    @unlink($status_root.'/deleted-'.$connection_id);
  }

-  if ($removed_sites > 0 || $removed_images > 0)
+  if ($removed_sites > 0)
  {
-    update_category('all');
    invalidate_user_cache(true);
  }

--- a/runtime/lib/build-webdav-derivatives.php
+++ b/runtime/lib/build-webdav-derivatives.php
@@ -6,7 +6,7 @@ if (PHP_SAPI !== 'cli')
  exit(1);
 }

-const BRATONIEN_WEBDAV_DERIVATIVE_BUILDER_VERSION = '0.9.6.1';
+const BRATONIEN_WEBDAV_DERIVATIVE_BUILDER_VERSION = '0.9.7.8';

 $options = getopt('', array('piwigo-root:', 'connection-id:'));
 $piwigo_root = rtrim((string)($options['piwigo-root'] ?? ''), '/');
@@ -46,20 +46,84 @@ if (!function_exists('bratonien_tools_webdav_image_source_info') || !function_ex
  exit(1);
 }

+function bratonien_tools_webdav_modus_config()
+{
+  global $conf;
+
+  $modus = $conf['modus_theme'] ?? array();
+  if (is_string($modus) && $modus !== '')
+  {
+    $decoded = @unserialize($modus);
+    if (is_array($decoded)) $modus = $decoded;
+  }
+  if (!is_array($modus)) $modus = array();
+
+  return array_merge(
+    array(
+      'index_photo_deriv'=>'2small',
+      'index_photo_deriv_hdpi'=>'xsmall',
+    ),
+    $modus
+  );
+}
+
+function bratonien_tools_webdav_gallery_base_params()
+{
+  $modus = bratonien_tools_webdav_modus_config();
+  $type = trim((string)($modus['index_photo_deriv'] ?? '2small'));
+  $params = $type !== '' ? @ImageStdParams::get_by_type($type) : null;
+  if ($params) return $params;
+
+  $params = ImageStdParams::get_by_type(IMG_THUMB);
+  if (!$params)
+  {
+    throw new RuntimeException('Piwigo-Galeriederivat ist nicht konfiguriert.');
+  }
+  return $params;
+}
+
+function bratonien_tools_webdav_modus_gallery_params(SrcImage $src, $base_params)
+{
+  $row_height = (int)$base_params->max_height();
+  $candidates = array($base_params);
+
+  foreach (ImageStdParams::get_defined_type_map() as $params)
+  {
+    if (
+      $params->max_height() > $row_height
+      && $params->sizing->max_crop == $base_params->sizing->max_crop
+    )
+    {
+      $candidates[] = $params;
+      if (count($candidates) === 3) break;
+    }
+  }
+
+  $selected = $base_params;
+  foreach ($candidates as $params)
+  {
+    $selected = $params;
+    $probe = new DerivativeImage($params, $src);
+    $size = $probe->get_size();
+    if ((int)$size[1] >= $row_height - 2) break;
+  }
+
+  return $selected;
+}
+
 try
 {
-  $variants = bratonien_tools_webdav_derivative_variants();
-  if (!$variants)
-  {
-    throw new RuntimeException('Keine Piwigo-Derivate konfiguriert.');
-  }
+  $gallery_base_params = bratonien_tools_webdav_gallery_base_params();
+  $gallery_base_type = (string)$gallery_base_params->type;

  $images = 0;
  $generated_or_ready = 0;
  $identity = 0;
  $metadata_repaired = 0;
+  $legacy_derivatives_rebuilt = 0;
  $errors = 0;
  $error_lines = array();
+  $variant_counts = array();

  $result = pwg_query('SELECT * FROM '.IMAGES_TABLE.' ORDER BY id');
  while ($row = pwg_db_fetch_assoc($result))
@@ -109,34 +173,59 @@ try
    }

    $src = new SrcImage($row);
-    foreach ($variants as $variant_name => $params)
+    try
    {
-      try
-      {
-        $probe = new DerivativeImage($params, $src);
-        if ($probe->same_as_source())
-        {
-          $identity++;
-          continue;
-        }
+      $gallery_params = bratonien_tools_webdav_modus_gallery_params($src, $gallery_base_params);
+      $variant = (string)$gallery_params->type;
+      if ($variant === '') $variant = 'custom';
+      $variant_counts[$variant] = ($variant_counts[$variant] ?? 0) + 1;

-        $detail = '';
-        if (bratonien_tools_webdav_generate_derivative($params, $src, $detail))
+      $probe = new DerivativeImage($gallery_params, $src);
+      if ($probe->same_as_source())
+      {
+        $identity++;
+        continue;
+      }
+
+      $target = $probe->get_path();
+      if ($target !== '' && is_file($target) && is_readable($target))
+      {
+        $expected_size = $gallery_params->compute_final_size(array($preview_width, $preview_height));
+        $existing_size = @getimagesize($target);
+        if (
+          is_array($expected_size)
+          && isset($expected_size[0], $expected_size[1])
+          && is_array($existing_size)
+          && isset($existing_size[0], $existing_size[1])
+          && ((int)$existing_size[0] !== (int)$expected_size[0] || (int)$existing_size[1] !== (int)$expected_size[1])
+        )
        {
-          $generated_or_ready++;
-        }
-        else
-        {
-          $errors++;
-          $error_lines[] = 'Bild #'.$image_id.' '.$variant_name.': '.($detail !== '' ? $detail : 'Derivat konnte nicht erzeugt werden.');
+          if (!@unlink($target))
+          {
+            $errors++;
+            $error_lines[] = 'Bild #'.$image_id.' Galerie: falsches Alt-Derivat konnte nicht entfernt werden: '.$target;
+            continue;
+          }
+          $legacy_derivatives_rebuilt++;
        }
      }
-      catch (Throwable $e)
+
+      $detail = '';
+      if (bratonien_tools_webdav_generate_derivative($gallery_params, $src, $detail))
+      {
+        $generated_or_ready++;
+      }
+      else
      {
        $errors++;
-        $error_lines[] = 'Bild #'.$image_id.' '.$variant_name.': '.get_class($e).': '.$e->getMessage();
+        $error_lines[] = 'Bild #'.$image_id.' Galerie: '.($detail !== '' ? $detail : 'Galeriederivat konnte nicht erzeugt werden.');
      }
    }
+    catch (Throwable $e)
+    {
+      $errors++;
+      $error_lines[] = 'Bild #'.$image_id.' Galerie: '.get_class($e).': '.$e->getMessage();
+    }
  }

  if ($metadata_repaired > 0)
@@ -157,12 +246,22 @@ try
    }
  }

+  ksort($variant_counts);
+  $variant_parts = array();
+  foreach ($variant_counts as $type=>$count)
+  {
+    $variant_parts[] = $type.':'.$count;
+  }
+
  echo 'WebDAV-Derivative-Builder: version='.BRATONIEN_WEBDAV_DERIVATIVE_BUILDER_VERSION.
    ' bilder='.$images.
-    ' varianten='.count($variants).
+    ' varianten_pro_bild=1'.
+    ' modus_basis='.$gallery_base_type.
+    ' modus_varianten='.implode(',', $variant_parts).
    ' bereit='.$generated_or_ready.
    ' identisch='.$identity.
    ' metadaten_repariert='.$metadata_repaired.
+    ' alt_derivate_neu='.$legacy_derivatives_rebuilt.
    ' fehler='.$errors."\n";

  exit($errors > 0 ? 1 : 0);
--- a/runtime/lib/build_webdav_placeholder_source.py
+++ b/runtime/lib/build_webdav_placeholder_source.py
@@ -2,12 +2,8 @@
 """Build a placeholder-backed local source tree from Nextcloud WebDAV.

 This creates only tiny placeholder files plus a metadata mapping; no Nextcloud
-original media is stored locally. The authenticated Nextcloud user is never used
-as an album name.
-
-Each placeholder carries the original image dimensions. Dimensions are read
-from Nextcloud metadata first. If those metadata are unavailable, only the
-beginning of the original file is read through WebDAV and parsed locally.
+original media is downloaded. The authenticated Nextcloud user is never used as
+an album name.
 """

 from __future__ import annotations
@@ -31,10 +27,8 @@ from pathlib import Path, PurePosixPath

 DAV = "DAV:"
 OC = "http://owncloud.org/ns"
-NC = "http://nextcloud.org/ns"
 SUPPORTED_IMAGE_EXTENSIONS = {".jpg", ".jpeg", ".png", ".gif", ".webp"}
 PLACEHOLDER = base64.b64decode("R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==")
-DIMENSION_PROBE_BYTES = 4 * 1024 * 1024


 def fail(message: str) -> None:
@@ -60,101 +54,6 @@ def safe_local_name(name: str) -> str:
    return name


-def parse_dimensions(prop: ET.Element) -> tuple[int, int]:
-    for property_name in ("file-metadata-size", "metadata-photos-size"):
-        raw = prop.findtext(f"{{{NC}}}{property_name}", default="").strip()
-        if not raw:
-            continue
-        try:
-            decoded = json.loads(raw)
-        except (TypeError, ValueError, json.JSONDecodeError):
-            continue
-        if isinstance(decoded, dict) and isinstance(decoded.get("value"), dict):
-            decoded = decoded["value"]
-        if not isinstance(decoded, dict):
-            continue
-        try:
-            width = int(decoded.get("width", 0) or 0)
-            height = int(decoded.get("height", 0) or 0)
-        except (TypeError, ValueError):
-            continue
-        if width > 0 and height > 0:
-            return width, height
-    return 0, 0
-
-
-def parse_image_header_dimensions(data: bytes) -> tuple[int, int]:
-    if len(data) >= 24 and data.startswith(b"\x89PNG\r\n\x1a\n") and data[12:16] == b"IHDR":
-        return int.from_bytes(data[16:20], "big"), int.from_bytes(data[20:24], "big")
-
-    if len(data) >= 10 and data[:6] in (b"GIF87a", b"GIF89a"):
-        return int.from_bytes(data[6:8], "little"), int.from_bytes(data[8:10], "little")
-
-    if len(data) >= 12 and data[:4] == b"RIFF" and data[8:12] == b"WEBP":
-        chunk = data[12:16]
-        if chunk == b"VP8X" and len(data) >= 30:
-            width = 1 + int.from_bytes(data[24:27], "little")
-            height = 1 + int.from_bytes(data[27:30], "little")
-            return width, height
-        if chunk == b"VP8 " and len(data) >= 30:
-            payload = 20
-            if data[payload + 3:payload + 6] == b"\x9d\x01\x2a":
-                width = int.from_bytes(data[payload + 6:payload + 8], "little") & 0x3FFF
-                height = int.from_bytes(data[payload + 8:payload + 10], "little") & 0x3FFF
-                return width, height
-        if chunk == b"VP8L" and len(data) >= 25 and data[20] == 0x2F:
-            b1, b2, b3, b4 = data[21:25]
-            width = 1 + b1 + ((b2 & 0x3F) << 8)
-            height = 1 + ((b2 & 0xC0) >> 6) + (b3 << 2) + ((b4 & 0x0F) << 10)
-            return width, height
-
-    if len(data) >= 4 and data[:2] == b"\xff\xd8":
-        sof_markers = {
-            0xC0, 0xC1, 0xC2, 0xC3,
-            0xC5, 0xC6, 0xC7,
-            0xC9, 0xCA, 0xCB,
-            0xCD, 0xCE, 0xCF,
-        }
-        pos = 2
-        while pos + 4 <= len(data):
-            if data[pos] != 0xFF:
-                pos += 1
-                continue
-            while pos < len(data) and data[pos] == 0xFF:
-                pos += 1
-            if pos >= len(data):
-                break
-            marker = data[pos]
-            pos += 1
-            if marker in (0xD8, 0xD9) or 0xD0 <= marker <= 0xD7:
-                continue
-            if marker == 0xDA:
-                break
-            if pos + 2 > len(data):
-                break
-            segment_length = int.from_bytes(data[pos:pos + 2], "big")
-            if segment_length < 2:
-                break
-            if marker in sof_markers:
-                if pos + 7 > len(data):
-                    break
-                height = int.from_bytes(data[pos + 3:pos + 5], "big")
-                width = int.from_bytes(data[pos + 5:pos + 7], "big")
-                return width, height
-            pos += segment_length
-
-    return 0, 0
-
-
-def placeholder_bytes(width: int, height: int) -> bytes:
-    if not (1 <= width <= 65535 and 1 <= height <= 65535):
-        fail(f"unsupported image dimensions for placeholder: {width}x{height}")
-    data = bytearray(PLACEHOLDER)
-    data[6:8] = width.to_bytes(2, "little")
-    data[8:10] = height.to_bytes(2, "little")
-    return bytes(data)
-
-
@contextmanager
 def pinned_resolution(host: str, ip: str):
    host = host.strip("[]").lower()
@@ -193,50 +92,22 @@ class WebDavClient:
        self.auth_header = f"Basic {token}"
        self.context = ssl.create_default_context()

-    def file_url(self, relative: str) -> str:
+    def collection_url(self, relative: str) -> str:
        user = urllib.parse.quote(self.user, safe="")
        suffix = quote_path(relative)
-        return f"{self.base_url}/remote.php/dav/files/{user}/{suffix}"
-
-    def collection_url(self, relative: str) -> str:
-        url = self.file_url(relative)
-        if not url.endswith("/"):
-            url += "/"
+        url = f"{self.base_url}/remote.php/dav/files/{user}/"
+        if suffix:
+            url += suffix + "/"
        return url

-    def probe_dimensions(self, relative: str) -> tuple[int, int]:
-        request = urllib.request.Request(self.file_url(relative), method="GET")
-        request.add_header("Authorization", self.auth_header)
-        request.add_header("Range", f"bytes=0-{DIMENSION_PROBE_BYTES - 1}")
-        try:
-            with pinned_resolution(self.host, self.connect_ip):
-                with urllib.request.urlopen(request, timeout=self.timeout, context=self.context) as response:
-                    if response.status not in (200, 206):
-                        fail(f"Nextcloud image header returned HTTP {response.status}")
-                    data = response.read(DIMENSION_PROBE_BYTES)
-        except urllib.error.HTTPError as error:
-            if error.code in {401, 403}:
-                fail("Nextcloud rejected the WebDAV credentials or file access")
-            fail(f"Nextcloud image header request failed with HTTP {error.code}")
-        except urllib.error.URLError as error:
-            fail(f"Nextcloud WebDAV is unreachable while reading image dimensions: {error.reason}")
-
-        width, height = parse_image_header_dimensions(data)
-        if width < 1 or height < 1:
-            fail(f"original image dimensions could not be read from Nextcloud file header: {relative}")
-        return width, height
-
    def list_collection(self, relative: str) -> tuple[dict[str, object], list[dict[str, object]]]:
        relative = validate_relative(relative)
        url = self.collection_url(relative)
        body = (
            '<?xml version="1.0"?>'
-            '<d:propfind xmlns:d="DAV:" xmlns:oc="http://owncloud.org/ns" '
-            'xmlns:nc="http://nextcloud.org/ns">'
+            '<d:propfind xmlns:d="DAV:" xmlns:oc="http://owncloud.org/ns">'
            '<d:prop><d:displayname/><d:resourcetype/><d:getcontenttype/>'
-            '<d:getcontentlength/><d:getetag/><oc:fileid/>'
-            '<nc:file-metadata-size/><nc:metadata-photos-size/>'
-            '</d:prop></d:propfind>'
+            '<d:getcontentlength/><d:getetag/><oc:fileid/></d:prop></d:propfind>'
        ).encode("utf-8")
        request = urllib.request.Request(url, data=body, method="PROPFIND")
        request.add_header("Authorization", self.auth_header)
@@ -280,7 +151,6 @@ class WebDavClient:
            fileid_text = prop.findtext(f"{{{OC}}}fileid", default="").strip()
            resource_type = prop.find(f"{{{DAV}}}resourcetype")
            is_dir = resource_type is not None and resource_type.find(f"{{{DAV}}}collection") is not None
-            width, height = parse_dimensions(prop)
            item = {
                "display_name": display,
                "fileid": int(fileid_text) if fileid_text.isdigit() else 0,
@@ -288,8 +158,6 @@ class WebDavClient:
                "content_type": prop.findtext(f"{{{DAV}}}getcontenttype", default=""),
                "size": int(prop.findtext(f"{{{DAV}}}getcontentlength", default="0") or 0),
                "etag": prop.findtext(f"{{{DAV}}}getetag", default="").strip('"'),
-                "width": width,
-                "height": height,
            }
            if href_path == base_path:
                current = item
@@ -301,17 +169,18 @@ class WebDavClient:
        return current, children


-def write_placeholder(target: Path, width: int, height: int) -> None:
+def link_placeholder(seed: Path, target: Path) -> None:
    target.parent.mkdir(parents=True, exist_ok=True)
-    target.write_bytes(placeholder_bytes(width, height))
-    os.chmod(target, 0o644)
+    try:
+        os.link(seed, target)
+    except OSError:
+        target.write_bytes(PLACEHOLDER)


-def build_root(client: WebDavClient, remote_root: str, local_root: Path, mapping: dict[str, dict[str, object]]) -> tuple[int, int, int, int]:
+def build_root(client: WebDavClient, remote_root: str, local_root: Path, seed: Path, mapping: dict[str, dict[str, object]]) -> tuple[int, int, int]:
    files = 0
    folders = 0
    skipped = 0
-    probed = 0
    stack: list[tuple[str, Path]] = [(validate_relative(remote_root), local_root)]
    visited: set[str] = set()

@@ -341,16 +210,7 @@ def build_root(client: WebDavClient, remote_root: str, local_root: Path, mapping
            if extension not in SUPPORTED_IMAGE_EXTENSIONS:
                skipped += 1
                continue
-
-            width = int(child.get("width", 0) or 0)
-            height = int(child.get("height", 0) or 0)
-            dimension_source = "metadata"
-            if width < 1 or height < 1:
-                width, height = client.probe_dimensions(child_remote)
-                dimension_source = "header"
-                probed += 1
-
-            write_placeholder(child_local, width, height)
+            link_placeholder(seed, child_local)
            files += 1
            mapping[str(child_local)] = {
                "kind": "file",
@@ -360,11 +220,8 @@ def build_root(client: WebDavClient, remote_root: str, local_root: Path, mapping
                "content_type": str(child.get("content_type", "")),
                "size": int(child.get("size", 0)),
                "etag": str(child.get("etag", "")),
-                "width": width,
-                "height": height,
-                "dimension_source": dimension_source,
            }
-    return files, folders, skipped, probed
+    return files, folders, skipped


 def atomic_json(path: Path, payload: object) -> None:
@@ -408,7 +265,10 @@ def main() -> int:
        source_dir = args.source_dir.resolve()
        staging = source_dir.with_name(f".{source_dir.name}.next")
        previous = source_dir.with_name(f".{source_dir.name}.previous")
+        seed = source_dir.parent / ".bratonien-webdav-placeholder.gif"
        source_dir.parent.mkdir(parents=True, exist_ok=True)
+        seed.write_bytes(PLACEHOLDER)
+        os.chmod(seed, 0o644)
        if staging.exists():
            shutil.rmtree(staging)
        staging.mkdir(parents=True)
@@ -416,7 +276,7 @@ def main() -> int:
        client = WebDavClient(args.base_url, args.user, password, max(1, args.timeout), args.connect_ip)
        mapping: dict[str, dict[str, object]] = {}
        manifest: list[str] = []
-        total_files = total_folders = total_skipped = total_probed = 0
+        total_files = total_folders = total_skipped = 0
        used_fileids: set[int] = set()

        for remote_root_raw in args.root:
@@ -428,11 +288,10 @@ def main() -> int:
            used_fileids.add(fileid)
            local_name = f"root-{fileid}"
            local_root = staging / local_name
-            files, folders, skipped, probed = build_root(client, remote_root, local_root, mapping)
+            files, folders, skipped = build_root(client, remote_root, local_root, seed, mapping)
            total_files += files
            total_folders += folders
            total_skipped += skipped
-            total_probed += probed

            if remote_root == "":
                for child in sorted(root_children, key=lambda item: str(item.get("display_name", "")).casefold()):
@@ -474,7 +333,7 @@ def main() -> int:

        atomic_text(args.manifest, "\n".join(manifest) + "\n")
        atomic_json(args.mapping, {
-            "version": 3,
+            "version": 1,
            "base_url": args.base_url.rstrip("/"),
            "connect_ip": client.connect_ip,
            "user": args.user,
@@ -485,7 +344,6 @@ def main() -> int:
            "files": total_files,
            "folders": total_folders,
            "skipped": total_skipped,
-            "dimension_header_probes": total_probed,
            "connect_ip": client.connect_ip,
            "source_dir": str(source_dir),
            "manifest": str(args.manifest),
--- a/runtime/lib/piwigo-sync.php
+++ b/runtime/lib/piwigo-sync.php
@@ -252,8 +252,6 @@ try
      );
      decode_ws(http_request($base_url.'/ws.php?format=json', array('method'=>'bratonien.nc.syncProductive', 'site_id'=>$site_id), $headers));
      $orphan = decode_ws(http_request($base_url.'/ws.php?format=json', array('method'=>'bratonien.nc.syncOrphans', 'site_id'=>$site_id, 'simulate'=>0), $headers));
-      // Entfernt alte technische bratonien-webdav-N Wrapper aus Site 1,
-      // nachdem deren generierte Verzeichnisse beim Reconcile entfernt wurden.
      if ($site_id !== 1)
      {
        decode_ws(http_request($base_url.'/ws.php?format=json', array('method'=>'bratonien.nc.syncOrphans', 'site_id'=>1, 'simulate'=>0), $headers));
@@ -284,16 +282,31 @@ try
  try
  {
    decode_ws(http_request($base_url.'/ws.php?format=json', array('method'=>'pwg.session.login', 'username'=>$fallback_user, 'password'=>$fallback_password), array(), $cookie_file));
-    http_request(
-      $base_url.'/admin.php?page=site_update&site='.$site_id,
-      array('sync'=>'files','display_info'=>1,'privacy_level'=>0,'sync_meta'=>1,'simulate'=>0,'subcats-included'=>1,'bratonien_connector'=>1,'submit'=>1),
+
+    // Der Fallback darf keinen zweiten Strukturpfad benutzen. Auch mit
+    // Benutzer/Passwort wird exakt derselbe Bratonien-Sync wie mit API-Key
+    // ausgefuehrt. Dadurch werden alte technische WebDAV-Kategorien entfernt
+    // und vorhandene Piwigo-Alben wiederverwendet.
+    decode_ws(http_request(
+      $base_url.'/ws.php?format=json',
+      array('method'=>'bratonien.nc.syncProductive', 'site_id'=>$site_id),
      array(),
      $cookie_file
-    );
-    $orphan = decode_ws(http_request($base_url.'/ws.php?format=json', array('method'=>'bratonien.nc.syncOrphans', 'site_id'=>$site_id, 'simulate'=>0), array(), $cookie_file));
+    ));
+    $orphan = decode_ws(http_request(
+      $base_url.'/ws.php?format=json',
+      array('method'=>'bratonien.nc.syncOrphans', 'site_id'=>$site_id, 'simulate'=>0),
+      array(),
+      $cookie_file
+    ));
    if ($site_id !== 1)
    {
-      decode_ws(http_request($base_url.'/ws.php?format=json', array('method'=>'bratonien.nc.syncOrphans', 'site_id'=>1, 'simulate'=>0), array(), $cookie_file));
+      decode_ws(http_request(
+        $base_url.'/ws.php?format=json',
+        array('method'=>'bratonien.nc.syncOrphans', 'site_id'=>1, 'simulate'=>0),
+        array(),
+        $cookie_file
+      ));
    }
    $added = (int)($orphan['added_orphans'] ?? 0);
    $deleted = (int)($orphan['deleted_orphans'] ?? 0);
--- a/runtime/lib/precache-webdav-previews.php
+++ b/runtime/lib/precache-webdav-previews.php
@@ -34,7 +34,7 @@ function fetch_remote_blob($url, $user, $password)
    CURLOPT_HTTPAUTH => CURLAUTH_BASIC,
    CURLOPT_USERPWD => $user.':'.$password,
    CURLOPT_FAILONERROR => false,
-    CURLOPT_USERAGENT => 'Bratonien-Tools-WebDAV-Precache/0.9.7.16',
+    CURLOPT_USERAGENT => 'Bratonien-Tools-WebDAV-Precache/0.9.7.1',
  );
  bratonien_tools_nc_transport_apply_curl($options, $url);
  curl_setopt_array($ch, $options);
@@ -52,11 +52,12 @@ function fetch_remote_blob($url, $user, $password)

 function preview_extension_for_entry(array $entry)
 {
+  $content_type = strtolower(trim((string)($entry['content_type'] ?? '')));
  $path = strtolower((string)($entry['webdav_path'] ?? ''));
-  $extension = strtolower(pathinfo($path, PATHINFO_EXTENSION));
-  if ($extension === 'png') return 'png';
-  if ($extension === 'gif') return 'gif';
-  if ($extension === 'webp') return 'webp';
+  if ($content_type === 'image/png' || preg_match('/\.png$/', $path))
+  {
+    return 'png';
+  }
  return 'jpg';
 }

@@ -67,7 +68,7 @@ function preview_target_for_entry($cache_dir, $key, array $entry)

 function remove_other_preview_format($cache_dir, $key, $keep_target)
 {
-  foreach (array('jpg', 'png', 'gif', 'webp') as $ext)
+  foreach (array('jpg', 'png', 'webp') as $ext)
  {
    $candidate = $cache_dir.'/'.$key.'.'.$ext;
    if ($candidate !== $keep_target && is_file($candidate)) @unlink($candidate);
@@ -89,19 +90,13 @@ function write_preview_imagick($blob, $target, $extension)
    {
      $image->setImageFormat('png');
    }
-    elseif ($extension === 'gif')
-    {
-      $image->setImageFormat('gif');
-    }
-    elseif ($extension === 'webp')
-    {
-      $image->setImageFormat('webp');
-      $image->setImageCompressionQuality(BRATONIEN_WEBDAV_PREVIEW_JPEG_QUALITY);
-    }
    else
    {
      $image->setImageBackgroundColor('white');
-      if (method_exists($image, 'mergeImageLayers')) $image = $image->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);
+      if (method_exists($image, 'mergeImageLayers'))
+      {
+        $image = $image->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);
+      }
      $image->setImageFormat('jpeg');
      $image->setImageCompression(Imagick::COMPRESSION_JPEG);
      $image->setImageCompressionQuality(BRATONIEN_WEBDAV_PREVIEW_JPEG_QUALITY);
@@ -136,7 +131,7 @@ function write_preview_gd($blob, $target, $extension)

    try
    {
-      if (in_array($extension, array('png', 'gif', 'webp'), true))
+      if ($extension === 'png')
      {
        imagealphablending($preview, false);
        imagesavealpha($preview, true);
@@ -154,12 +149,10 @@ function write_preview_gd($blob, $target, $extension)
        fail_preview('GD konnte das Preview nicht skalieren.');
      }

-      if ($extension === 'png') $written = imagepng($preview, $target, 6);
-      elseif ($extension === 'gif') $written = function_exists('imagegif') ? imagegif($preview, $target) : false;
-      elseif ($extension === 'webp') $written = function_exists('imagewebp') ? imagewebp($preview, $target, BRATONIEN_WEBDAV_PREVIEW_JPEG_QUALITY) : false;
-      else $written = imagejpeg($preview, $target, BRATONIEN_WEBDAV_PREVIEW_JPEG_QUALITY);
-
-      if (!$written) fail_preview('GD konnte das Preview im Format '.$extension.' nicht schreiben.');
+      $written = $extension === 'png'
+        ? imagepng($preview, $target, 6)
+        : imagejpeg($preview, $target, BRATONIEN_WEBDAV_PREVIEW_JPEG_QUALITY);
+      if (!$written) fail_preview('GD konnte das Preview nicht schreiben.');
    }
    finally
    {
@@ -175,7 +168,7 @@ function write_preview_gd($blob, $target, $extension)
 function write_preview($blob, $target, $extension)
 {
  $dir = dirname($target);
-  if (!is_dir($dir) && !mkdir($dir, 0775, true) && !is_dir($dir)) fail_preview('Preview-Verzeichnis konnte nicht angelegt werden.');
+  if (!is_dir($dir) && !mkdir($dir, 0755, true) && !is_dir($dir)) fail_preview('Preview-Verzeichnis konnte nicht angelegt werden.');

  if (class_exists('Imagick'))
  {
@@ -197,48 +190,7 @@ function write_preview($blob, $target, $extension)
    @unlink($target);
    fail_preview('Das erzeugte Preview ist ungültig.');
  }
-  @chmod($target, 0664);
-}
-
-function local_source_is_hydrated($source_path, $preview)
-{
-  if (!is_file($source_path) || !is_readable($source_path)) return false;
-  $source_size = @getimagesize($source_path);
-  $preview_size = @getimagesize($preview);
-  if (!is_array($source_size) || !is_array($preview_size)) return false;
-  if ((int)$source_size[0] !== (int)$preview_size[0] || (int)$source_size[1] !== (int)$preview_size[1]) return false;
-  $source_bytes = @filesize($source_path);
-  $preview_bytes = @filesize($preview);
-  return $source_bytes !== false && $preview_bytes !== false && (int)$source_bytes === (int)$preview_bytes;
-}
-
-function hydrate_local_source($source_path, $preview)
-{
-  $normalized = str_replace('\\', '/', (string)$source_path);
-  if (!preg_match('#/nc-webdav-source/connection-[0-9]+/root-[0-9]+/#', $normalized))
-  {
-    fail_preview('Unsicherer lokaler Connector-Quellpfad: '.$source_path);
-  }
-  if (!is_file($preview) || !is_readable($preview)) fail_preview('Preview für lokale Quelle fehlt: '.$preview);
-  if (local_source_is_hydrated($source_path, $preview)) return false;
-
-  $dir = dirname($source_path);
-  if (!is_dir($dir) && !mkdir($dir, 0775, true) && !is_dir($dir)) fail_preview('Lokales Connector-Verzeichnis konnte nicht angelegt werden: '.$dir);
-
-  $tmp = $source_path.'.bratonien-next-'.getmypid();
-  if (!@copy($preview, $tmp)) fail_preview('Preview konnte nicht in lokale Piwigo-Quelle kopiert werden: '.$source_path);
-  @chmod($tmp, 0664);
-  $mtime = @filemtime($preview);
-  if ($mtime) @touch($tmp, $mtime);
-  if (!@rename($tmp, $source_path))
-  {
-    @unlink($tmp);
-    fail_preview('Lokale Piwigo-Quelle konnte nicht ersetzt werden: '.$source_path);
-  }
-  clearstatcache(true, $source_path);
-  $size = @getimagesize($source_path);
-  if (!is_array($size) || empty($size[0]) || empty($size[1])) fail_preview('Lokale Piwigo-Quelle ist nach dem Ersetzen ungültig: '.$source_path);
-  return true;
+  @chmod($target, 0644);
 }

 try
@@ -260,8 +212,8 @@ try
  $mapping = json_decode((string)file_get_contents($mapping_file), true);
  if (!is_array($mapping) || !isset($mapping['files']) || !is_array($mapping['files'])) fail_preview('WebDAV-Mapping ist ungültig.');

-  if (!is_dir($cache_dir) && !mkdir($cache_dir, 0775, true) && !is_dir($cache_dir)) fail_preview('Preview-Cache konnte nicht angelegt werden.');
-  @chmod($cache_dir, 2775);
+  if (!is_dir($cache_dir) && !mkdir($cache_dir, 0755, true) && !is_dir($cache_dir)) fail_preview('Preview-Cache konnte nicht angelegt werden.');
+  @chmod($cache_dir, 0755);

  $state_file = $cache_dir.'/state.json';
  $old_state = array();
@@ -274,10 +226,9 @@ try
  $new_state = array();
  $generated = 0;
  $cached = 0;
-  $hydrated = 0;
  $errors = 0;

-  foreach ($mapping['files'] as $local_path=>$entry)
+  foreach ($mapping['files'] as $entry)
  {
    if (!is_array($entry) || (string)($entry['kind'] ?? '') !== 'file') continue;
    $webdav_path = trim((string)($entry['webdav_path'] ?? ''), '/');
@@ -294,29 +245,26 @@ try
      'version' => BRATONIEN_WEBDAV_PREVIEW_VERSION,
    );

+    $old = $old_state[$key] ?? null;
+    if (
+      is_file($target)
+      && is_array($old)
+      && (string)($old['etag'] ?? '') === $etag
+      && (string)($old['format'] ?? '') === $extension
+      && (int)($old['version'] ?? 0) === BRATONIEN_WEBDAV_PREVIEW_VERSION
+    )
+    {
+      $cached++;
+      continue;
+    }
+
    try
    {
-      $old = $old_state[$key] ?? null;
-      $valid_cached = is_file($target)
-        && is_array($old)
-        && (string)($old['etag'] ?? '') === $etag
-        && (string)($old['format'] ?? '') === $extension
-        && (int)($old['version'] ?? 0) === BRATONIEN_WEBDAV_PREVIEW_VERSION;
-
-      if (!$valid_cached)
-      {
-        $url = $base_url.'/remote.php/dav/files/'.rawurlencode($user).'/'.quote_webdav_path($webdav_path);
-        $blob = fetch_remote_blob($url, $user, $password);
-        write_preview($blob, $target, $extension);
-        remove_other_preview_format($cache_dir, $key, $target);
-        $generated++;
-      }
-      else
-      {
-        $cached++;
-      }
-
-      if (hydrate_local_source((string)$local_path, $target)) $hydrated++;
+      $url = $base_url.'/remote.php/dav/files/'.rawurlencode($user).'/'.quote_webdav_path($webdav_path);
+      $blob = fetch_remote_blob($url, $user, $password);
+      write_preview($blob, $target, $extension);
+      remove_other_preview_format($cache_dir, $key, $target);
+      $generated++;
    }
    catch (Throwable $e)
    {
@@ -329,14 +277,14 @@ try
  {
    if (!is_file($file) || basename($file) === 'state.json') continue;
    $name = basename($file);
-    if (!preg_match('/^([a-f0-9]{40})\.(jpg|png|gif|webp)$/', $name, $m)) continue;
+    if (!preg_match('/^([a-f0-9]{40})\.(jpg|png|webp)$/', $name, $m)) continue;
    if (!isset($new_state[$m[1]])) @unlink($file);
  }

  file_put_contents($state_file, json_encode($new_state, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT)."\n", LOCK_EX);
-  @chmod($state_file, 0664);
+  @chmod($state_file, 0644);

-  echo 'WebDAV-Previews: erzeugt='.$generated.' vorhanden='.$cached.' lokale_quellen='.$hydrated.' fehler='.$errors."\n";
+  echo 'WebDAV-Previews: erzeugt='.$generated.' vorhanden='.$cached.' fehler='.$errors."\n";
  exit($errors > 0 ? 1 : 0);
 }
 catch (Throwable $e)
--- a/runtime/repair-webdav-cache-permissions.sh
+++ b/runtime/repair-webdav-cache-permissions.sh
@@ -1,36 +0,0 @@
-#!/usr/bin/env bash
-set -Eeuo pipefail
-
-PIWIGO_ROOT="${1:-/var/www/piwigo}"
-PIWIGO_ROOT="${PIWIGO_ROOT%/}"
-DATA_DIR="$PIWIGO_ROOT/_data"
-
-[[ -d "$DATA_DIR" ]] || { echo "Piwigo-_data wurde nicht gefunden: $DATA_DIR" >&2; exit 1; }
-[[ "$(id -u)" -eq 0 ]] || { echo "Die Reparatur muss als root ausgeführt werden." >&2; exit 1; }
-
-DATA_UID="$(stat -c '%u' "$DATA_DIR")"
-DATA_GID="$(stat -c '%g' "$DATA_DIR")"
-
-PATHS=(
-  "$DATA_DIR/bratonien-tools/nc-webdav-gallery"
-  "$DATA_DIR/bratonien-tools/nc-webdav-preview"
-  "$DATA_DIR/i/_data/bratonien-tools/nc-webdav-gallery"
-  "$DATA_DIR/i/bratonien-watermark"
-)
-
-found=0
-for path in "${PATHS[@]}"; do
-  [[ -e "$path" ]] || continue
-  found=1
-  echo "Repariere: $path"
-  chown -R "$DATA_UID:$DATA_GID" -- "$path"
-  find "$path" -type d -exec chmod 2775 {} +
-  find "$path" -type f -exec chmod 0664 {} +
-done
-
-if [[ "$found" -eq 0 ]]; then
-  echo "Keine Bratonien-Cache-Verzeichnisse gefunden."
-  exit 0
-fi
-
-echo "Bratonien-Cache-Rechte wurden an $DATA_DIR angeglichen (UID $DATA_UID, GID $DATA_GID)."
--- a/runtime/sync-webdav.sh
+++ b/runtime/sync-webdav.sh
@@ -138,9 +138,33 @@ if [[ "${PIWIGO_SYNC_ENABLED:-0}" == "1" ]]; then
        exit "$PIWIGO_EXIT"
    fi

+    if [[ "${BRATONIEN_NC_NATIVE:-0}" == "1" ]]; then
+        if command -v timeout >/dev/null 2>&1; then
+            if ! timeout 30m env PIWIGO_CONFIG="$CONFIG_FILE" bash "$SCRIPT_DIR/build-webdav-media.sh"; then
+                write_status error "Bildaufbereitung ist fehlgeschlagen oder hat das 30-Minuten-Limit erreicht"
+                exit 1
+            fi
+        elif ! env PIWIGO_CONFIG="$CONFIG_FILE" bash "$SCRIPT_DIR/build-webdav-media.sh"; then
+            write_status error "Bildaufbereitung ist fehlgeschlagen"
+            exit 1
+        fi
+    else
+        MEDIA_UNIT="bratonien-nc-media-${CONNECTION_ID}-$(date +%s)"
+        if ! systemd-run \
+            --quiet \
+            --collect \
+            --unit="$MEDIA_UNIT" \
+            --property=RuntimeMaxSec=30min \
+            --setenv="PIWIGO_CONFIG=$CONFIG_FILE" \
+            /usr/bin/env bash "$SCRIPT_DIR/build-webdav-media.sh"; then
+            write_status error "Bildaufbereitung konnte nicht im Hintergrund gestartet werden"
+            exit 1
+        fi
+    fi
+
    if grep -q 'Piwigo-Synchronisierung per API erfolgreich' <<<"$PIWIGO_OUTPUT"; then
        write_status ok \
-            "WebDAV eingelesen und Piwigo synchronisiert" \
+            "WebDAV eingelesen und Piwigo synchronisiert; Bildaufbereitung abgeschlossen" \
            "" \
            "api" \
            "ok" \
@@ -149,7 +173,7 @@ if [[ "${PIWIGO_SYNC_ENABLED:-0}" == "1" ]]; then
            "Fallback wurde nicht benötigt"
    elif grep -q 'Piwigo-Datenbanksynchronisierung per Benutzername/Passwort-Fallback erfolgreich' <<<"$PIWIGO_OUTPUT"; then
        write_status ok \
-            "WebDAV eingelesen und Piwigo über Fallback synchronisiert" \
+            "WebDAV eingelesen und Piwigo über Fallback synchronisiert; Bildaufbereitung abgeschlossen" \
            "" \
            "fallback" \
            "not_used" \
@@ -157,7 +181,7 @@ if [[ "${PIWIGO_SYNC_ENABLED:-0}" == "1" ]]; then
            "ok" \
            "Benutzername/Passwort-Fallback erfolgreich"
    else
-        write_status ok "WebDAV eingelesen und Piwigo synchronisiert"
+        write_status ok "WebDAV eingelesen und Piwigo synchronisiert; Bildaufbereitung abgeschlossen"
    fi
 else
    write_status ok "WebDAV eingelesen; Piwigo-Synchronisierung ist für diese Verbindung deaktiviert"
--- a/template/admin_tabs.tpl
+++ b/template/admin_tabs.tpl
@@ -9,7 +9,13 @@
 .bratonien-tab-panel { width:100%; max-width:none; margin-left:0 !important; margin-right:0 !important; }
 .bratonien-tab-panel[hidden] { display:none !important; }
 .bratonien-card { margin-left:0; margin-right:0; }
-@media (max-width:760px) { .bratonien-tabs{gap:5px}.bratonien-tab{border-bottom:1px solid rgba(255,255,255,.16);border-radius:4px;margin-bottom:0;padding:9px 11px} }
+.bratonien-edit-dialog { width:min(920px,calc(100vw - 3rem)); max-height:88vh; overflow:auto; background:#444; color:inherit; border:1px solid #777; border-radius:4px; padding:0; box-shadow:0 18px 60px rgba(0,0,0,.55); }
+.bratonien-edit-dialog::backdrop { background:rgba(0,0,0,.55); }
+.bratonien-edit-dialog__body { padding:1.25rem 1.5rem; }
+.bratonien-storage-row { display:grid; grid-template-columns:minmax(120px,.7fr) minmax(150px,1fr) minmax(240px,1.5fr) auto; gap:.5rem; align-items:end; margin:.5rem 0; }
+.bratonien-storage-row label { display:flex; flex-direction:column; gap:.25rem; }
+.bratonien-storage-row input { width:100%; box-sizing:border-box; }
+@media (max-width:760px) { .bratonien-tabs{gap:5px}.bratonien-tab{border-bottom:1px solid rgba(255,255,255,.16);border-radius:4px;margin-bottom:0;padding:9px 11px}.bratonien-storage-row{grid-template-columns:1fr} }
 </style>
 <div id="bratonien-tabs-anchor"></div>
 <script>
@@ -53,15 +59,19 @@

    function token(){var input=section.querySelector('input[name="pwg_token"]');return input?input.value:'';}
    function setOpen(value){try{if(value)sessionStorage.setItem(storageKey,'1');else sessionStorage.removeItem(storageKey);}catch(e){}}
-    function setMode(value){try{if(value)sessionStorage.setItem(modeKey,value);else sessionStorage.removeItem(modeKey);}catch(e){}}
    function mode(){try{return sessionStorage.getItem(modeKey)||'';}catch(e){return '';}}
+    function clearMode(){try{sessionStorage.removeItem(modeKey);}catch(e){}}
    function applyMode(){
      if(!dialog)return;
+      var current=mode();
      var heading=dialog.querySelector('h4');
      var finish=dialog.querySelector('button[value="nc_connector_wizard_finish"]');
-      if(mode()==='edit'){
+      if(current==='edit'){
        if(heading)heading.textContent='Verbindung bearbeiten';
        if(finish)finish.textContent='Änderungen speichern';
+      }else if(current==='migrate'){
+        if(heading)heading.textContent='Auf WebDAV migrieren';
+        if(finish)finish.textContent='Migration starten';
      }else{
        if(heading)heading.textContent='Neue Verbindung';
        if(finish)finish.textContent='Verbindung anlegen';
@@ -80,13 +90,13 @@
      return fetch(window.location.href,{method:'POST',credentials:'same-origin',cache:'no-store',headers:{'Content-Type':'application/x-www-form-urlencoded;charset=UTF-8'},body:body.toString()});
    }
    function closeAfterReset(){
-      if(resetBusy)return;resetBusy=true;setOpen(false);setMode('');
+      if(resetBusy)return;resetBusy=true;setOpen(false);clearMode();
      resetServer().catch(function(){}).finally(function(){resetBusy=false;if(dialog){if(typeof dialog.close==='function'&&dialog.open)dialog.close();else dialog.removeAttribute('open');}});
    }

    if(openButton){
      openButton.addEventListener('click',function(event){
-        event.preventDefault();event.stopImmediatePropagation();setMode('');showWizard();
+        event.preventDefault();event.stopImmediatePropagation();clearMode();showWizard();
      },true);
    }
    if(closeButton){
@@ -95,33 +105,111 @@
    if(dialog){
      dialog.addEventListener('cancel',function(event){event.preventDefault();event.stopImmediatePropagation();closeAfterReset();},true);
      dialog.addEventListener('click',function(event){if(event.target===dialog){event.preventDefault();event.stopImmediatePropagation();closeAfterReset();}},true);
-
      [].slice.call(dialog.querySelectorAll('form[data-bratonien-wizard-form]')).forEach(function(form){
        form.addEventListener('submit',function(event){
          var submitter=event.submitter;
          setOpen(true);
          if(submitter&&submitter.hasAttribute('data-bratonien-wizard-end')){
            setOpen(false);
-            if(submitter.value==='nc_connector_wizard_reset'||submitter.value==='nc_connector_wizard_finish')setMode('');
+            if(submitter.value==='nc_connector_wizard_reset')clearMode();
          }
        },true);
      });
-
-      [].slice.call(section.querySelectorAll('form')).forEach(function(form){
-        var editButton=form.querySelector('button[value="nc_connector_edit_start"]');
-        if(!editButton)return;
-        form.addEventListener('submit',function(event){
-          if(event.submitter&&event.submitter.value==='nc_connector_edit_start'){
-            setMode('edit');setOpen(true);
-          }
-        },true);
-      });
-
      try{if(sessionStorage.getItem(storageKey)==='1')showWizard();}catch(e){}
      applyMode();
    }
  }

+  function initNCConnectionEditing(){
+    var section=document.getElementById('nc-connector');if(!section)return;
+    var modeKey='bratonienNcWizardMode';
+    var pwgTokenInput=section.querySelector('input[name="pwg_token"]');
+    var pwgToken=pwgTokenInput?pwgTokenInput.value:'';
+
+    function setMode(value){try{sessionStorage.setItem(modeKey,value);}catch(e){}}
+    function makePostButton(label,tool,id,modeValue){
+      var form=document.createElement('form');form.method='post';form.style.display='inline';
+      var token=document.createElement('input');token.type='hidden';token.name='pwg_token';token.value=pwgToken;form.appendChild(token);
+      var connection=document.createElement('input');connection.type='hidden';connection.name='connection_id';connection.value=String(id);form.appendChild(connection);
+      var button=document.createElement('button');button.type='submit';button.className='buttonLike';button.name='bratonien_tool';button.value=tool;button.textContent=label;
+      if(modeValue)form.addEventListener('submit',function(){setMode(modeValue);});
+      form.appendChild(button);return form;
+    }
+    function escapeHtml(value){return String(value==null?'':value).replace(/[&<>"']/g,function(c){return {'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#039;'}[c];});}
+    function localEditorDialog(){
+      var dialog=document.getElementById('bratonien-nc-local-edit-dialog');
+      if(dialog)return dialog;
+      dialog=document.createElement('dialog');dialog.id='bratonien-nc-local-edit-dialog';dialog.className='bratonien-edit-dialog';
+      dialog.innerHTML='<div class="bratonien-edit-dialog__body"><div style="display:flex;align-items:center;justify-content:space-between;gap:1rem"><div><h4 style="margin:0">Verbindung bearbeiten</h4><p class="bratonien-base-note" style="margin:.35rem 0 0">Bestehende Legacy-Verbindung. Änderungen werden in derselben Verbindung gespeichert.</p></div><button type="button" class="buttonLike" data-local-edit-close>Schließen</button></div><div data-local-edit-content style="margin-top:1rem"></div></div>';
+      document.body.appendChild(dialog);
+      dialog.querySelector('[data-local-edit-close]').addEventListener('click',function(){dialog.close();});
+      dialog.addEventListener('click',function(event){if(event.target===dialog)dialog.close();});
+      return dialog;
+    }
+    function storageRow(storage){
+      return '<div class="bratonien-storage-row" data-storage-row>'+
+        '<label>Storage-ID<input name="nc_storage_id[]" value="'+escapeHtml(storage.storage_id||'')+'" required></label>'+
+        '<label>Quellordner<input name="nc_source_prefix[]" value="'+escapeHtml(storage.source_prefix||'')+'" placeholder="optional"></label>'+
+        '<label>Lokaler Speicherpfad<input name="nc_local_mount[]" value="'+escapeHtml(storage.local_mount||'')+'" required></label>'+
+        '<button type="button" class="buttonLike" data-remove-storage>Entfernen</button></div>';
+    }
+    function openLocalEditor(id){
+      var dialog=localEditorDialog();
+      var content=dialog.querySelector('[data-local-edit-content]');
+      content.innerHTML='<p class="bratonien-base-note">Verbindung wird geladen …</p>';
+      if(typeof dialog.showModal==='function')dialog.showModal();else dialog.setAttribute('open','open');
+      fetch('plugins/bratonien_tools/nc-connector-edit-data.php?connection_id='+encodeURIComponent(id)+'&_='+Date.now(),{credentials:'same-origin',cache:'no-store',headers:{'Accept':'application/json'}})
+        .then(function(response){return response.json().then(function(data){if(!response.ok)throw new Error(data.error||('HTTP '+response.status));return data;});})
+        .then(function(data){
+          if(data.adapter!=='local')throw new Error('Diese Verbindung ist keine Legacy-Verbindung.');
+          var legacy=data.legacy||{};var storages=Array.isArray(legacy.storages)?legacy.storages:[];
+          var rows=storages.map(storageRow).join('');
+          if(!rows)rows=storageRow({});
+          content.innerHTML='<form method="post" data-local-edit-form>'+
+            '<input type="hidden" name="pwg_token" value="'+escapeHtml(pwgToken)+'">'+
+            '<input type="hidden" name="connection_id" value="'+escapeHtml(data.id)+'">'+
+            '<div class="bratonien-form-grid">'+
+              '<label class="bratonien-label">Name</label><input name="connection_name" value="'+escapeHtml(data.name)+'" required>'+
+              '<label class="bratonien-label">Datenbank-Server</label><input name="nc_host" value="'+escapeHtml(legacy.host)+'" required>'+
+              '<label class="bratonien-label">Port</label><input name="nc_port" type="number" min="1" max="65535" value="'+escapeHtml(legacy.port||5432)+'" required>'+
+              '<label class="bratonien-label">Datenbank</label><input name="nc_database" value="'+escapeHtml(legacy.database)+'" required>'+
+              '<label class="bratonien-label">Reader-Benutzer</label><input name="nc_user" value="'+escapeHtml(legacy.user)+'" required>'+
+              '<label class="bratonien-label">Reader-Passwort</label><input name="nc_db_password" type="password" autocomplete="new-password" placeholder="leer = unverändert">'+
+            '</div>'+
+            '<h5 style="margin-top:1rem">Speicherorte</h5><p class="bratonien-base-note">Jeder Speicherort wird einzeln bearbeitet. Es ist kein Pipe-/Textformat erforderlich.</p><div data-storage-list>'+rows+'</div><button type="button" class="buttonLike" data-add-storage>Speicherort hinzufügen</button>'+
+            '<details style="margin-top:1rem"><summary>Erweiterte Legacy-Einstellungen</summary><div class="bratonien-form-grid" style="margin-top:.75rem">'+
+              '<label class="bratonien-label">Source-View</label><input name="nc_source_view" value="'+escapeHtml(legacy.source_view)+'" required>'+
+              '<label class="bratonien-label">Activity-View</label><input name="nc_activity_view" value="'+escapeHtml(legacy.activity_view)+'" required>'+
+              '<label class="bratonien-label">Piwigo-Galerieordner</label><input name="nc_gallery_root" value="'+escapeHtml(legacy.gallery_root)+'" required>'+
+              '<label class="bratonien-label">Ruhezeit (Sek.)</label><input name="nc_quiet_seconds" type="number" min="0" value="'+escapeHtml(legacy.quiet_seconds)+'">'+
+              '<label class="bratonien-label">Maximale Wartezeit (Sek.)</label><input name="nc_max_wait_seconds" type="number" min="60" value="'+escapeHtml(legacy.max_wait_seconds)+'">'+
+              '<label class="bratonien-label">Vollprüfung nach (Sek.)</label><input name="nc_full_sync_seconds" type="number" min="300" value="'+escapeHtml(legacy.full_sync_seconds)+'">'+
+            '</div></details>'+
+            '<div class="bratonien-actions" style="margin-top:1rem"><button class="buttonLike" type="submit" name="bratonien_tool" value="nc_connector_update_local">Änderungen speichern</button><button class="buttonLike" type="button" data-local-edit-cancel>Abbrechen</button></div></form>';
+          var form=content.querySelector('[data-local-edit-form]');
+          form.querySelector('[data-local-edit-cancel]').addEventListener('click',function(){dialog.close();});
+          form.querySelector('[data-add-storage]').addEventListener('click',function(){form.querySelector('[data-storage-list]').insertAdjacentHTML('beforeend',storageRow({}));});
+          form.addEventListener('click',function(event){var remove=event.target.closest('[data-remove-storage]');if(remove){var row=remove.closest('[data-storage-row]');if(row)row.remove();}});
+        })
+        .catch(function(error){content.innerHTML='<p class="bratonien-main-cache__warning"><strong>Bearbeiten nicht möglich:</strong> '+escapeHtml(error.message||String(error))+'</p>';});
+    }
+
+    [].slice.call(section.querySelectorAll('button[value="nc_connector_edit_start"]')).forEach(function(button){var form=button.closest('form');if(form)form.remove();});
+
+    [].slice.call(section.querySelectorAll('button[value="nc_connector_delete"]')).forEach(function(deleteButton){
+      var deleteForm=deleteButton.closest('form');var card=deleteButton.closest('details');if(!deleteForm||!card)return;
+      var idInput=deleteForm.querySelector('input[name="connection_id"]');if(!idInput)return;var id=idInput.value;
+      var actions=deleteForm.parentElement;if(!actions)return;
+      var text=card.textContent||'';var isLocal=text.indexOf('bestehende Legacy-Konfiguration')!==-1;
+      if(isLocal){
+        var edit=document.createElement('button');edit.type='button';edit.className='buttonLike';edit.textContent='Bearbeiten';edit.addEventListener('click',function(){openLocalEditor(id);});actions.insertBefore(edit,deleteForm);
+        actions.insertBefore(makePostButton('Auf WebDAV migrieren','nc_connector_migrate_start',id,'migrate'),deleteForm);
+      }else{
+        actions.insertBefore(makePostButton('Bearbeiten','nc_connector_edit_start',id,'edit'),deleteForm);
+      }
+    });
+  }
+
  function initNCConnectorPolling(){
    var section=document.getElementById('nc-connector');if(!section)return;
    var endpoint='plugins/bratonien_tools/nc-connector-status.php';
@@ -174,7 +262,7 @@
    poll();schedule();
  }

-  function initAll(){initBratonienTabs();initNCWizardLifecycle();initNCConnectorPolling();}
+  function initAll(){initBratonienTabs();initNCWizardLifecycle();initNCConnectionEditing();initNCConnectorPolling();}
  if(document.readyState==='loading')document.addEventListener('DOMContentLoaded',initAll);else initAll();
 })();
 </script>
--- a/tools/album_rules.inc.php
+++ b/tools/album_rules.inc.php
@@ -93,7 +93,37 @@ function bratonien_tools_resolve_album_rule($category_id, array $categories, arr
    $by_id[(int)$category['id']] = $category;
  }

-  $current = (int)$category_id;
+  $category_id = (int)$category_id;
+  $root = $by_id[$category_id] ?? null;
+  $is_private = $root && isset($root['status']) && $root['status'] === 'private';
+
+  // Privat ist eine Vererbungsgrenze. Eine direkt auf diesem privaten Album
+  // gesetzte Regel bleibt moeglich, aber Regeln oeffentlicher Eltern duerfen
+  // nicht in ein privates Album hineinvererbt werden.
+  if ($is_private)
+  {
+    if (isset($rules[$category_id]))
+    {
+      $rule = $rules[$category_id];
+      if ($rule['mode'] === 'disabled')
+      {
+        return array('mode'=>'disabled','profile_id'=>null,'source'=>'album');
+      }
+      if ($rule['mode'] === 'profile')
+      {
+        return array('mode'=>'profile','profile_id'=>(int)$rule['profile_id'],'source'=>'album');
+      }
+    }
+
+    $profile_id = $defaults['private_profile'] ?? null;
+    if (empty($profile_id))
+    {
+      return array('mode'=>'disabled','profile_id'=>null,'source'=>'global');
+    }
+    return array('mode'=>'profile','profile_id'=>(int)$profile_id,'source'=>'global');
+  }
+
+  $current = $category_id;
  $visited = array();

  while ($current > 0 && isset($by_id[$current]) && !isset($visited[$current]))
@@ -116,10 +146,7 @@ function bratonien_tools_resolve_album_rule($category_id, array $categories, arr
    $current = (int)($by_id[$current]['id_uppercat'] ?? 0);
  }

-  $root = $by_id[(int)$category_id] ?? null;
-  $is_private = $root && isset($root['status']) && $root['status'] === 'private';
-  $profile_id = $is_private ? ($defaults['private_profile'] ?? null) : ($defaults['public_profile'] ?? null);
-
+  $profile_id = $defaults['public_profile'] ?? null;
  if (empty($profile_id))
  {
    return array('mode'=>'disabled','profile_id'=>null,'source'=>'global');
--- a/webdav-image.php
+++ b/webdav-image.php
@@ -121,7 +121,7 @@ $options = array(
  CURLOPT_USERPWD => $user.':'.$password,
  CURLOPT_RETURNTRANSFER => false,
  CURLOPT_FAILONERROR => false,
-  CURLOPT_USERAGENT => 'Bratonien-Tools-WebDAV-Image/0.9.7.16',
+  CURLOPT_USERAGENT => 'Bratonien-Tools-WebDAV-Image/0.9.7.1',
  CURLOPT_HEADERFUNCTION => function($ch, $line)
  {
    $length = strlen($line);
Author	SHA1	Message	Date
Terranom674	531bffa973	Bereinige versehentlich angelegte Leerdatei	2026-08-19 22:17:02 +02:00
Terranom674	5ed53dca8d	noop	2026-08-19 22:15:46 +02:00