diff --git a/ui/src/api/queries/admin/apps.ts b/ui/src/api/queries/admin/apps.ts
index ede1e8bf..188f220c 100644
--- a/ui/src/api/queries/admin/apps.ts
+++ b/ui/src/api/queries/admin/apps.ts
@@ -203,3 +203,27 @@ export function usePromoteDeployment() {
     onSuccess: () => qc.invalidateQueries({ queryKey: ['apps'] }),
   });
 }
+
+// --- Dirty State ---
+
+export interface DirtyStateDifference {
+  field: string;
+  staged: string;
+  deployed: string;
+}
+
+export interface DirtyState {
+  dirty: boolean;
+  lastSuccessfulDeploymentId: string | null;
+  differences: DirtyStateDifference[];
+}
+
+export function useDirtyState(envSlug: string | undefined, appSlug: string | undefined) {
+  return useQuery({
+    queryKey: ['apps', envSlug, appSlug, 'dirty-state'],
+    queryFn: () => apiFetch<DirtyState>(
+      `${envBase(envSlug!)}/${encodeURIComponent(appSlug!)}/dirty-state`,
+    ),
+    enabled: !!envSlug && !!appSlug,
+  });
+}
diff --git a/ui/src/api/queries/commands.ts b/ui/src/api/queries/commands.ts
index 99fcc1c4..818b4f3e 100644
--- a/ui/src/api/queries/commands.ts
+++ b/ui/src/api/queries/commands.ts
@@ -83,9 +83,13 @@ export interface ConfigUpdateResponse {
 export function useUpdateApplicationConfig() {
   const queryClient = useQueryClient()
   return useMutation({
-    mutationFn: async ({ config, environment }: { config: ApplicationConfig; environment: string }) => {
+    mutationFn: async ({ config, environment, apply = 'live' }: {
+      config: ApplicationConfig;
+      environment: string;
+      apply?: 'staged' | 'live';
+    }) => {
       const res = await authFetch(
-        `/environments/${encodeURIComponent(environment)}/apps/${encodeURIComponent(config.application)}/config`, {
+        `/environments/${encodeURIComponent(environment)}/apps/${encodeURIComponent(config.application)}/config?apply=${apply}`, {
         method: 'PUT',
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify(config),