diff --git a/backend/main.py b/backend/main.py
index 2496738..4d66590 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -406,7 +406,7 @@ async def serve_media(path: str, request: _Request):
         raise _HE(404, "Nicht gefunden.")
     return _media_response(filepath)
 
-APP_VER = "937"  # muss mit APP_VER in app.js übereinstimmen
+APP_VER = "938"  # muss mit APP_VER in app.js übereinstimmen
 
 @app.get("/.well-known/assetlinks.json")
 async def assetlinks():
diff --git a/backend/routes/admin.py b/backend/routes/admin.py
index 19e93eb..b48720c 100644
--- a/backend/routes/admin.py
+++ b/backend/routes/admin.py
@@ -1067,7 +1067,7 @@ async def generate_media_previews(user=Depends(require_admin)):
     skipped   = 0
     errors    = 0
 
-    for subdir in ("diary", "forum"):
+    for subdir in ("diary", "forum", "breeds", "breeds/gallery", "breeds/submissions"):
         folder = os.path.join(MEDIA_DIR, subdir)
         if not os.path.isdir(folder):
             continue
diff --git a/backend/static/js/app.js b/backend/static/js/app.js
index cd0ced3..f7dde7c 100644
--- a/backend/static/js/app.js
+++ b/backend/static/js/app.js
@@ -3,7 +3,7 @@
    Router, State-Management, Navigation, Initialisierung.
    ============================================================ */
 
-const APP_VER     = '937'; // ← bei jedem Deploy mit Frontend-Änderungen erhöhen
+const APP_VER     = '938'; // ← bei jedem Deploy mit Frontend-Änderungen erhöhen
 const APP_VERSION = '1.5.1'; // ← semantische Version, wird bei make release gesetzt
 const IS_STAGING  = location.hostname === 'staging.banyaro.app';
 // Cache-Bust-Parameter nach Update-Reload sofort entfernen
diff --git a/backend/static/js/pages/wiki.js b/backend/static/js/pages/wiki.js
index b0c101d..86bb8d9 100644
--- a/backend/static/js/pages/wiki.js
+++ b/backend/static/js/pages/wiki.js
@@ -384,8 +384,13 @@ window.Page_wiki = (() => {
 
   function _breedCardHtml(r) {
     const fotoUrl   = r.foto_url || r.user_foto || '';
+    // Für lokale Bilder: _preview.webp zuerst, bei Fehler Original nachladen
+    const srcUrl    = fotoUrl.startsWith('/media/')
+      ? fotoUrl.replace(/\.(jpe?g|png|gif|webp)$/i, '_preview.webp')
+      : fotoUrl;
     const photoHtml = fotoUrl
-      ? `<img class="wiki-breed-photo" src="${_esc(fotoUrl)}" loading="lazy" alt="${_esc(r.name)}" onerror="this.style.display='none';this.nextElementSibling.style.display='flex'">`
+      ? `<img class="wiki-breed-photo" src="${_esc(srcUrl)}" loading="lazy" alt="${_esc(r.name)}"
+             onerror="if(this.src.includes('_preview')){this.src='${_esc(fotoUrl)}'}else{this.style.display='none';this.nextElementSibling.style.display='flex'}">`
       : '';
     const fallbackHtml = `<div class="wiki-breed-photo-fallback" style="${fotoUrl ? 'display:none' : ''}">${_DOG_SILHOUETTE}</div>`;
 
@@ -746,7 +751,9 @@ window.Page_wiki = (() => {
              ${allFotos.map((f, i) => `
                <button class="wiki-gallery-thumb${i === 0 ? ' active' : ''}" data-idx="${i}"
                        aria-label="Foto ${i + 1}">
-                 <img src="${_esc(f.foto_url)}" alt="" loading="lazy">
+                 <img src="${_esc(f.foto_url.startsWith('/media/') ? f.foto_url.replace(/\.(jpe?g|png|gif|webp)$/i,'_preview.webp') : f.foto_url)}"
+                      alt="" loading="lazy"
+                      onerror="if(this.src.includes('_preview')){this.src='${_esc(f.foto_url)}'}else{this.style.display='none'}">
                  ${f.user_name ? `<span class="wiki-gallery-thumb-label">von ${_esc(f.user_name)}</span>` : ''}
                </button>`).join('')}
            </div>` : ''}
diff --git a/backend/static/sw.js b/backend/static/sw.js
index ce2b895..5be62bd 100644
--- a/backend/static/sw.js
+++ b/backend/static/sw.js
@@ -3,7 +3,7 @@
    Offline-Cache + Push Notifications + Tile-Cache
    ============================================================ */
 
-const CACHE_VERSION = 'by-v937';
+const CACHE_VERSION = 'by-v938';
 const CACHE_STATIC  = `${CACHE_VERSION}-static`;
 const CACHE_TILES   = 'ban-yaro-tiles-v1';  // bleibt über SW-Updates erhalten
 const CACHE_API     = 'ban-yaro-api-v1';    // API-Response-Cache