Похоже работает

frontend/src/components/llm/ProviderConfig.svelte

@@ -75,8 +75,15 @@
     const method = editingProvider ? 'PUT' : 'POST';
     const endpoint = editingProvider ? `/llm/providers/${editingProvider.id}` : '/llm/providers';
 
+    // When editing, only include api_key if user entered a new one
+    const submitData = { ...formData };
+    if (editingProvider && !submitData.api_key) {
+      // If editing and api_key is empty, don't send it (backend will keep existing)
+      delete submitData.api_key;
+    }
+
     try {
-      await requestApi(endpoint, method, formData);
+      await requestApi(endpoint, method, submitData);
       showForm = false;
       resetForm();
       onSave();