diff --git a/apps/backend/migrations/00012_memberships_and_manage_token.sql b/apps/backend/migrations/00012_memberships_and_manage_token.sql
index 013e2f5..c73f2f7 100644
--- a/apps/backend/migrations/00012_memberships_and_manage_token.sql
+++ b/apps/backend/migrations/00012_memberships_and_manage_token.sql
@@ -30,12 +30,13 @@ WHERE manage_token IS NULL;
 ALTER TABLE locations
   ADD COLUMN IF NOT EXISTS updated_at timestamptz NOT NULL DEFAULT now();
 
--- Demo tenant membership so demo-owner resolves to Studio Atelier.
+-- Backfill memberships for every existing user linked via tenant_users.
+-- Covers the seeded demo owner (users.neon_subject = 'demo-owner').
 INSERT INTO tenant_memberships (tenant_id, user_neon_subject, role)
-SELECT t.id, u.neon_subject, 'owner'
-FROM tenants t
-JOIN users u ON u.neon_subject = 'demo-owner'
-WHERE t.slug = 'studio-atelier'
+SELECT tu.tenant_id, u.neon_subject, tu.role
+FROM tenant_users tu
+JOIN users u ON u.id = tu.user_id
+WHERE u.neon_subject IS NOT NULL
 ON CONFLICT (tenant_id, user_neon_subject) DO NOTHING;
 
 -- +goose Down
diff --git a/apps/frontend/src/routes/dashboard/bookings-page.tsx b/apps/frontend/src/routes/dashboard/bookings-page.tsx
index 5d8a0d1..946e729 100644
--- a/apps/frontend/src/routes/dashboard/bookings-page.tsx
+++ b/apps/frontend/src/routes/dashboard/bookings-page.tsx
@@ -72,15 +72,17 @@ function BookingsPage() {
     }
     setCreatingBooking(true);
     try {
-      await (apiClient as any).POST("/v1/catalog/bookings", {
+      const response = await (apiClient as any).POST("/v1/catalog/bookings", {
         headers: { Authorization: `Bearer ${bearer}` },
         body: {
           customerName: newBookingCustomer(), customerEmail: newBookingEmail(), service: newBookingService(),
           startsAt: new Date(`${newBookingDate()}T${newBookingTime()}`).toISOString(), notes: newBookingNotes()
         }
       });
+      if (response.error) throw new Error(typeof response.error === "string" ? response.error : "booking create failed");
       setNewBookingCustomer(""); setNewBookingEmail(""); setNewBookingService(""); setNewBookingDate(""); setNewBookingTime(""); setNewBookingNotes("");
       setShowNewBooking(false);
+      void data.refetchSummary();
     } catch { data.setDemoNotice(data.i18n.locale() === "cs" ? "Vytvoření rezervace selhalo." : "Failed to create booking."); }
     finally { setCreatingBooking(false); }
   };
diff --git a/apps/frontend/src/routes/dashboard/dashboard-data.ts b/apps/frontend/src/routes/dashboard/dashboard-data.ts
index f7bb7f2..fd829bc 100644
--- a/apps/frontend/src/routes/dashboard/dashboard-data.ts
+++ b/apps/frontend/src/routes/dashboard/dashboard-data.ts
@@ -94,6 +94,7 @@ export interface DashboardData {
   token: () => string | null | undefined;
   isDemoMode: () => boolean;
   resolvedSummary: () => any;
+  refetchSummary: () => void;
   resolvedBootstrap: () => any;
   resolvedBilling: () => any;
   normalizedKpis: () => any[];
@@ -150,7 +151,7 @@ export function DashboardDataProvider(props: { children: any }) {
   const isDemoMode = () => token()?.startsWith("demo.") ?? false;
   const demoData = createMemo(() => createDemoData(i18n));
 
-  const [summary] = createResource(token, async (bearer) => {
+  const [summary, { refetch: refetchSummary }] = createResource(token, async (bearer) => {
     if (!bearer) return null;
     if (bearer.startsWith("demo.")) return demoData().summary;
     const response = await apiClient.GET("/v1/dashboard/summary", { headers: { Authorization: `Bearer ${bearer}` } });
@@ -286,6 +287,7 @@ export function DashboardDataProvider(props: { children: any }) {
     token: () => token(),
     isDemoMode,
     resolvedSummary,
+    refetchSummary,
     resolvedBootstrap,
     resolvedBilling,
     normalizedKpis,