diff --git a/backend/src/tools/media/routes.js b/backend/src/tools/media/routes.js
index 82edddc..5ad5e81 100644
--- a/backend/src/tools/media/routes.js
+++ b/backend/src/tools/media/routes.js
@@ -960,6 +960,31 @@ router.post('/favorites/:id/acknowledge', authenticate, requireAdmin, (req, res)
   } catch {}
 });
 
+// POST /favorites/:id/unacknowledge – Admin: Quittierung rückgängig machen
+router.post('/favorites/:id/unacknowledge', authenticate, requireAdmin, (req, res) => {
+  const fav = db.prepare('SELECT * FROM movie_favorites WHERE id=?').get(req.params.id);
+  if (!fav) return res.status(404).json({ error: 'Nicht gefunden' });
+  db.prepare('UPDATE movie_favorites SET acknowledged=0, acknowledged_at=NULL, user_notified=0 WHERE id=?').run(fav.id);
+  res.json({ ok: true });
+  // Pushover an den User — Quittierung zurückgezogen (fire & forget)
+  try {
+    const poCfg = db.prepare('SELECT user_key, app_token FROM pushover_settings WHERE user_id=?').get(fav.user_id);
+    if (poCfg?.app_token && poCfg?.user_key) {
+      fetch('https://api.pushover.net/1/messages.json', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({
+          token:   poCfg.app_token,
+          user:    poCfg.user_key,
+          title:   '↩ Favorit zurückgezogen',
+          message: `Die Bestätigung für "${fav.title}" wurde vom Admin zurückgezogen.`,
+          priority: 0,
+        }),
+      }).catch(() => {});
+    }
+  } catch {}
+});
+
 // Admin: ALLE verfügbaren Watch-Provider für Deutschland live von TMDb holen
 // Admin: Streaming-Top10-Cache leeren (z.B. nach Logik-Änderungen)
 // Debug: rohe TMDb-Treffer pro Anbieter/Schwelle prüfen
diff --git a/frontend/src/tools/media.jsx b/frontend/src/tools/media.jsx
index 98951c6..7d104c8 100644
--- a/frontend/src/tools/media.jsx
+++ b/frontend/src/tools/media.jsx
@@ -784,7 +784,7 @@ function FavoritenKalender({ onOpenModal }) {
                         {!!f.acknowledged && <span style={{marginLeft:6}}>✓</span>}
                       </div>
                     </div>
-                    {!f.acknowledged && (
+                    {!f.acknowledged ? (
                       <button onClick={async e=>{e.stopPropagation();
                         await api(`/tools/media/favorites/${f.id}/acknowledge`,{method:'POST',body:{}});
                         setAllFavs(prev=>prev.map(x=>x.id===f.id?{...x,acknowledged:1}:x));
@@ -792,6 +792,15 @@ function FavoritenKalender({ onOpenModal }) {
                         borderRadius:6,padding:'3px 10px',color:'#f59e0b',fontFamily:'monospace',fontSize:9,cursor:'pointer',flexShrink:0}}>
                         ✓
                       </button>
+                    ) : (
+                      <button onClick={async e=>{e.stopPropagation();
+                        await api(`/tools/media/favorites/${f.id}/unacknowledge`,{method:'POST',body:{}});
+                        setAllFavs(prev=>prev.map(x=>x.id===f.id?{...x,acknowledged:0}:x));
+                      }} title="Quittierung rückgängig"
+                        style={{background:'transparent',border:'1px solid rgba(255,255,255,0.1)',
+                        borderRadius:6,padding:'3px 8px',color:'rgba(255,255,255,0.25)',fontFamily:'monospace',fontSize:9,cursor:'pointer',flexShrink:0}}>
+                        ↩
+                      </button>
                     )}
                   </div>
                 ))}