add backfill vocal isolation button to shop settings

make_post_sell/templates/shop_settings.j2

@@ -455,6 +455,15 @@
 
     </form>
 
+    {% if request.shop.unsandbox_public_key and request.shop.unsandbox_secret_key %}
+    <form method="post" action="/s/{{ request.shop.id }}/settings" onsubmit="this.querySelector('[type=submit]').disabled = true; return true;">
+      <input type="hidden" name="form_section" value="backfill-karaoke" />
+      <input type="submit" class="mps-submit" value="Backfill Vocal Isolation" />
+      <br />
+      <small>Process all existing audio/video products for vocal isolation. Runs in background.</small>
+    </form>
+    {% endif %}
+
   </section>
 </section>
 

make_post_sell/views/shop.py

@@ -809,6 +809,19 @@ def shop_settings(request):
                     )
                     request.session.flash(("Backfilling vocal isolation for existing catalog in background.", "success"))
 
+        # Handle backfill karaoke button
+        if form_section == "backfill-karaoke":
+            if shop.unsandbox_public_key and shop.unsandbox_secret_key:
+                from ..lib.karaoke import backfill_karaoke_async
+                backfill_karaoke_async(
+                    shop.id,
+                    request.registry["dbsession_factory"],
+                    request.app,
+                )
+                request.session.flash(("Backfilling vocal isolation for existing catalog in background.", "success"))
+            else:
+                request.session.flash(("Set unsandbox API keys first.", "error"))
+
         # Handle maintenance settings form
         if form_section == "maintenance-settings":
             if shop.maint_mode != maint_mode: