diff --git a/backend/src/tools/dateien/routes.js b/backend/src/tools/dateien/routes.js
index cf263a4..c6f0ef4 100644
--- a/backend/src/tools/dateien/routes.js
+++ b/backend/src/tools/dateien/routes.js
@@ -10,6 +10,42 @@ const UPLOAD_DIR = process.env.UPLOAD_DIR || '/data/uploads';
 if (!fs.existsSync(UPLOAD_DIR)) fs.mkdirSync(UPLOAD_DIR, { recursive: true });
 const webdav = require('./webdav');
 
+// ── WebDAV Hilfsfunktionen ────────────────────────────────────────────────
+function getFolderPathById(folderId) {
+  if (!folderId) return '';
+  const parts = [];
+  let cur = folderId;
+  const seen = new Set();
+  while (cur) {
+    if (seen.has(cur)) break; seen.add(cur);
+    const fo = db.prepare('SELECT name, parent_id FROM folders WHERE id=?').get(cur);
+    if (!fo) break;
+    parts.unshift(fo.name.replace(/[\/]/g, '_'));
+    cur = fo.parent_id;
+  }
+  return parts.join('/');
+}
+
+function davFileUrl(username, folderId, filename) {
+  const cfg = webdav.getConfig();
+  if (!cfg.enabled) return null;
+  const base = webdav.userPath(cfg, username);
+  const folder = getFolderPathById(folderId);
+  return folder ? `${base}/${folder}/${filename}` : `${base}/${filename}`;
+}
+
+function davFolderUrl(username, folderId) {
+  const cfg = webdav.getConfig();
+  if (!cfg.enabled) return null;
+  const base = webdav.userPath(cfg, username);
+  const folder = getFolderPathById(folderId);
+  return folder ? `${base}/${folder}` : base;
+}
+
+function getUserName(userId) {
+  return db.prepare('SELECT username FROM users WHERE id=?').get(userId)?.username || String(userId);
+}
+
 const getSetting = key => db.prepare('SELECT value FROM admin_settings WHERE key=?').get(key)?.value;
 
 const diskStorage = multer.diskStorage({
@@ -102,7 +138,11 @@ router.post('/folders', authenticate, (req, res) => {
     if (!parent) return res.status(404).json({ error: 'Überordner nicht gefunden' });
   }
   const r = db.prepare('INSERT INTO folders (user_id,name,parent_id) VALUES (?,?,?)').run(req.user.id, name.trim(), parentId);
-  res.json(enrichFolder(db.prepare('SELECT * FROM folders WHERE id=?').get(r.lastInsertRowid)));
+  const newFolder = db.prepare('SELECT * FROM folders WHERE id=?').get(r.lastInsertRowid);
+  // WebDAV: Ordner anlegen
+  const _davFolderCreate = davFolderUrl(getUserName(req.user.id), newFolder.id);
+  if (_davFolderCreate) webdav.mkdirp(_davFolderCreate).catch(e => console.warn('[webdav] mkdir:', e.message));
+  res.json(enrichFolder(newFolder));
 });
 
 router.delete('/folders/:id', authenticate, (req, res) => {
@@ -111,6 +151,9 @@ router.delete('/folders/:id', authenticate, (req, res) => {
   // Delete all files inside
   const files = db.prepare('SELECT * FROM files WHERE folder_id=? AND user_id=?').all(folder.id, req.user.id);
   for (const f of files) { try { fs.unlinkSync(path.join(UPLOAD_DIR, f.filename)); } catch {} }
+  // WebDAV: Ordner löschen (vor DB-Löschung damit Pfad noch auflösbar)
+  const _davFolderDel = davFolderUrl(getUserName(req.user.id), folder.id);
+  if (_davFolderDel) webdav.deleteFile(_davFolderDel).catch(e => console.warn('[webdav] rmdir:', e.message));
   db.prepare('DELETE FROM files WHERE folder_id=? AND user_id=?').run(folder.id, req.user.id);
   db.prepare('DELETE FROM folders WHERE id=?').run(folder.id);
   res.json({ success: true });
@@ -200,32 +243,11 @@ router.post('/', authenticate, (req, res) => {
       .run(uid, req.file.filename, req.file.originalname, req.file.mimetype||'application/octet-stream', req.file.size, folderId);
     const newFile = db.prepare('SELECT f.*,u.username as owner FROM files f JOIN users u ON u.id=f.user_id WHERE f.id=?').get(r.lastInsertRowid);
 
-    // WebDAV: Datei asynchron spiegeln mit Ordnerstruktur
-    const cfg = webdav.getConfig();
-    if (cfg.enabled) {
-      const user = db.prepare('SELECT username FROM users WHERE id=?').get(uid);
-      // Ordnerpfad auflösen
-      function getFolderPath(fid) {
-        if (!fid) return '';
-        const parts = [];
-        let cur = fid;
-        const seen = new Set();
-        while (cur) {
-          if (seen.has(cur)) break; seen.add(cur);
-          const fo = db.prepare('SELECT name, parent_id FROM folders WHERE id=?').get(cur);
-          if (!fo) break;
-          parts.unshift(fo.name.replace(/[/\\]/g, '_'));
-          cur = fo.parent_id;
-        }
-        return parts.join('/');
-      }
-      const folderPath = getFolderPath(folderId);
-      const userBase   = webdav.userPath(cfg, user.username);
-      const davPath    = folderPath
-        ? `${userBase}/${folderPath}/${req.file.originalname}`
-        : `${userBase}/${req.file.originalname}`;
+    // WebDAV: Datei asynchron spiegeln
+    const _davPath = davFileUrl(getUserName(uid), folderId, req.file.originalname);
+    if (_davPath) {
       fs.readFile(path.join(UPLOAD_DIR, req.file.filename), (err, buf) => {
-        if (!err) webdav.uploadFile(buf, davPath, req.file.mimetype).catch(e => console.error('[webdav upload]', e.message));
+        if (!err) webdav.uploadFile(buf, _davPath, req.file.mimetype).catch(e => console.error('[webdav upload]', e.message));
       });
     }
 
@@ -333,6 +355,9 @@ router.get('/:id/download', authenticate, async (req, res) => {
 router.delete('/:id', authenticate, (req, res) => {
   const file = db.prepare('SELECT * FROM files WHERE id=? AND user_id=?').get(req.params.id, req.user.id);
   if (!file) return res.status(404).json({ error: 'Nicht gefunden' });
+  // WebDAV: Datei löschen
+  const _davFileDel = davFileUrl(getUserName(file.user_id), file.folder_id, file.originalname);
+  if (_davFileDel) webdav.deleteFile(_davFileDel).catch(e => console.warn('[webdav] delete:', e.message));
   try { fs.unlinkSync(path.join(UPLOAD_DIR, file.filename)); } catch {}
   db.prepare('DELETE FROM files WHERE id=?').run(file.id);
   res.json({ success: true });