diff --git a/src/service-worker.ts b/src/service-worker.ts
index ee3a14e..0bbc7e4 100644
--- a/src/service-worker.ts
+++ b/src/service-worker.ts
@@ -117,10 +117,12 @@ async function runSync(isUpdate: boolean): Promise<void> {
 
     await broadcast({ type: 'sync-start', total: worklist.length });
 
+    const successful = new Set<number>();
     let done = 0;
     const tasks = worklist.map((id) => async () => {
       const summary = summaries.find((s) => s.id === id);
-      await cacheRecipe(id, summary?.image_path ?? null);
+      const ok = await cacheRecipe(id, summary?.image_path ?? null);
+      if (ok) successful.add(id);
       done += 1;
       await broadcast({ type: 'sync-progress', current: done, total: worklist.length });
     });
@@ -130,7 +132,15 @@ async function runSync(isUpdate: boolean): Promise<void> {
       await removeRecipes(toRemove);
     }
 
-    await saveCachedIds(currentIds);
+    // Manifest: für Update = (cached - toRemove) + neue successes
+    // Für Initial = nur die diesmal erfolgreich gecachten
+    const finalManifest = isUpdate
+      ? Array.from(
+          new Set([...cachedIds.filter((id) => !toRemove.includes(id)), ...successful])
+        )
+      : Array.from(successful);
+
+    await saveCachedIds(finalManifest);
     await broadcast({ type: 'sync-done', lastSynced: Date.now() });
   } catch (e) {
     await broadcast({
@@ -154,24 +164,33 @@ async function fetchAllSummaries(): Promise<RecipeSummary[]> {
   return result;
 }
 
-async function cacheRecipe(id: number, imagePath: string | null): Promise<void> {
+async function cacheRecipe(id: number, imagePath: string | null): Promise<boolean> {
   const data = await caches.open(DATA_CACHE);
   const images = await caches.open(IMAGES_CACHE);
-  await Promise.all([
+  const [htmlOk, apiOk] = await Promise.all([
     addToCache(data, `/recipes/${id}`),
-    addToCache(data, `/api/recipes/${id}`),
-    imagePath && !/^https?:\/\//i.test(imagePath)
-      ? addToCache(images, `/images/${imagePath}`)
-      : Promise.resolve()
+    addToCache(data, `/api/recipes/${id}`)
   ]);
+  if (imagePath && !/^https?:\/\//i.test(imagePath)) {
+    // Image-Fehler soll den Recipe-Eintrag nicht invalidieren (bei
+    // manchen Rezepten gibt es schlicht kein Bild)
+    await addToCache(images, `/images/${imagePath}`);
+  }
+  return htmlOk && apiOk;
 }
 
-async function addToCache(cache: Cache, url: string): Promise<void> {
+async function addToCache(cache: Cache, url: string): Promise<boolean> {
   try {
     const res = await fetch(url);
-    if (res.ok) await cache.put(url, res);
-  } catch {
-    // Einzelne Fehler ignorieren — nächster Sync holt's nach.
+    if (!res.ok) {
+      console.warn(`[sw] cache miss ${url}: HTTP ${res.status}`);
+      return false;
+    }
+    await cache.put(url, res);
+    return true;
+  } catch (e) {
+    console.warn(`[sw] cache error ${url}:`, e);
+    return false;
   }
 }