feat(admin): multi-brand admin support

Implements the design at
docs/superpowers/specs/2026-06-04-multi-brand-admin-design.md.

Adds:
- admin_user_brands junction table (m:n admin<->brand) via migration 207
- New role 'multi_brand_admin' (auto-set when an admin has 2+ brands)
- 'active_brand_id' cookie that persists the admin's currently-selected
  brand across navigations; switchable via the new BrandSelector dropdown
  in the sidebar
- Centralised brand resolution in src/lib/brand-scope.ts:
  - getActiveBrandId (URL > cookie > legacy brand_id > first of brand_ids)
  - assertBrandAccess (defence-in-depth for cases where the brandId
    comes from a URL form or RPC return)
- ~30 server actions and ~10 page server components migrated to use
  getActiveBrandId instead of the silent brandId ?? adminUser.brand_id
  pattern that allowed cross-brand access bugs
- BrandSelector client component with proper a11y (aria-haspopup,
  aria-expanded, role=listbox, outside-click and escape-to-close)

Migration 207 also adds RLS so admins can read their own junction rows
(needed for the dropdown to populate) and SECURITY DEFINER RPCs
add/remove_admin_user_brand that auto-promote/demote between
brand_admin and multi_brand_admin.

Notes:
- Migration number is 207 not 204 — 204-206 were taken in this worktree
  by the concurrent locations work.
- The legacy admin_users.brand_id column is preserved for backwards
  compat; a follow-up migration 220_* will drop it.
- Dev sessions (dev_session cookie, NEXT_PUBLIC_USE_MOCK_DATA) get
  brand_ids: []; the documented limitation is that dev store_employee
  will see <AdminAccessDenied /> if no real brands exist.
- Pages that hardcode a Tuxedo brand UUID as a fallback
  (adminUser.brand_id ?? '64294306-...') are NOT migrated in this PR —
  they still work for single-brand admins and are out of scope.

Co-authored-by: implementer subagent (cancelled mid-run), Grok orchestrator

src/actions/ai-import.ts

@@ -1,6 +1,7 @@
 "use server";
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { assertBrandAccess } from "@/lib/brand-scope";
 import { parseExcelBuffer, parseTextBuffer } from "@/lib/excel-parser";
 import { importProductsBatch } from "@/actions/import-products";
 import { importOrdersBatch } from "@/actions/import-orders";
@@ -41,7 +42,9 @@ export async function analyzeImport(
 ): Promise<AnalyzeImportResult> {
   const adminUser = await getAdminUser();
   if (!adminUser) return { success: false, error: "Not authenticated" };
-  if (adminUser.role === "brand_admin" && adminUser.brand_id !== brandId) {
+  try {
+    assertBrandAccess(adminUser, brandId);
+  } catch {
     return { success: false, error: "Not authorized for this brand" };
   }
 

src/actions/analytics.ts

@@ -1,6 +1,7 @@
 "use server";
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { getActiveBrandId } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 
 const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
@@ -96,7 +97,7 @@ async function brandScopedRPC<T>(
   const adminUser = await getAdminUser();
   if (!adminUser) throw new Error("Not authenticated");
 
-  const brandId = adminUser.brand_id ?? null;
+  const brandId = await getActiveBrandId(adminUser);
 
   const response = await fetch(`${supabaseUrl}/rest/v1/rpc/${rpcName}`, {
     method: "POST",
@@ -232,7 +233,7 @@ export async function getRecentOrders(limit: number = 10): Promise<RecentOrder[]
     const adminUser = await getAdminUser();
     if (!adminUser) throw new Error("Not authenticated");
 
-    const brandId = adminUser.brand_id ?? null;
+    const brandId = await getActiveBrandId(adminUser);
 
     const params = new URLSearchParams({
       select: "id,customer_name,subtotal,status,created_at,fulfillment",
@@ -293,7 +294,7 @@ export async function getConversionFunnel(): Promise<ConversionFunnel[]> {
     const adminUser = await getAdminUser();
     if (!adminUser) throw new Error("Not authenticated");
 
-    const brandId = adminUser.brand_id ?? null;
+    const brandId = await getActiveBrandId(adminUser);
 
     const params = new URLSearchParams({
       select: "id,status",

src/actions/brands.ts

@@ -0,0 +1,65 @@
+import "server-only";
+
+import { getAdminUser } from "@/lib/admin-permissions";
+import { svcHeaders } from "@/lib/svc-headers";
+
+export type BrandListItem = {
+  id: string;
+  name: string;
+  slug: string;
+  logo_url: string | null;
+};
+
+/**
+ * Returns the list of brands the current admin user can act in.
+ *
+ * - platform_admin: all brands (queried directly from the `brands` table)
+ * - everyone else: brands in `adminUser.brand_ids`
+ * - empty array for unauthenticated / no-access admins
+ *
+ * This is a plain async function (not a server action) so it can be called
+ * from server components and server actions without the "use server" wrapper.
+ * The BrandSelector client component receives the result as a prop.
+ */
+export async function listBrandsForAdmin(): Promise<BrandListItem[]> {
+  const adminUser = await getAdminUser();
+  if (!adminUser) return [];
+
+  const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL;
+  const serviceKey = process.env.SUPABASE_SERVICE_ROLE_KEY;
+  if (!supabaseUrl || !serviceKey) return [];
+
+  if (adminUser.role === "platform_admin") {
+    try {
+      const res = await fetch(
+        `${supabaseUrl}/rest/v1/brands?select=id,name,slug,logo_url&order=name`,
+        { headers: svcHeaders(serviceKey), cache: "no-store" }
+      );
+      if (!res.ok) return [];
+      const data = await res.json();
+      return Array.isArray(data) ? data : [];
+    } catch {
+      return [];
+    }
+  }
+
+  if (adminUser.brand_ids.length === 0) return [];
+
+  // Use PostgREST `in` filter. The brand_ids are UUIDs, so the quoting
+  // pattern in the spec is safe; the inner quotes are required by PostgREST
+  // for UUID literals.
+  const filter = `id=in.(${adminUser.brand_ids
+    .map((id) => `"${id}"`)
+    .join(",")})`;
+  try {
+    const res = await fetch(
+      `${supabaseUrl}/rest/v1/brands?${filter}&select=id,name,slug,logo_url&order=name`,
+      { headers: svcHeaders(serviceKey), cache: "no-store" }
+    );
+    if (!res.ok) return [];
+    const data = await res.json();
+    return Array.isArray(data) ? data : [];
+  } catch {
+    return [];
+  }
+}

src/actions/communications/campaigns.ts

@@ -1,6 +1,7 @@
 "use server";
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { getActiveBrandId } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 
 export type CampaignType = "marketing" | "operational" | "transactional";
@@ -57,7 +58,11 @@ export async function getCommunicationCampaigns(brandId?: string): Promise<ListC
   const adminUser = await getAdminUser();
   if (!adminUser) return { success: false, error: "Not authenticated" };
 
-  const effectiveBrandId = brandId ?? adminUser.brand_id ?? null;
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  if (!activeBrandId && adminUser.role !== "platform_admin") {
+    return { success: false, error: "Brand access required" };
+  }
+  const effectiveBrandId = activeBrandId;
 
   const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
   const supabaseKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!;
@@ -147,7 +152,7 @@ export async function deleteCampaign(campaignId: string, brandId?: string): Prom
     {
       method: "POST",
       headers: { ...svcHeaders(supabaseKey), "Content-Type": "application/json" },
-      body: JSON.stringify({ p_campaign_id: campaignId, p_brand_id: adminUser.brand_id ?? null }),
+      body: JSON.stringify({ p_campaign_id: campaignId, p_brand_id: (await getActiveBrandId(adminUser)) ?? null }),
     }
   );
 
@@ -167,7 +172,7 @@ export async function getCampaignById(campaignId: string, brandId?: string): Pro
     {
       method: "POST",
       headers: { ...svcHeaders(supabaseKey), "Content-Type": "application/json" },
-      body: JSON.stringify({ p_campaign_id: campaignId, p_brand_id: brandId ?? adminUser.brand_id ?? null }),
+      body: JSON.stringify({ p_campaign_id: campaignId, p_brand_id: (await getActiveBrandId(adminUser, brandId)) ?? null }),
     }
   );
 

src/actions/communications/send.ts

@@ -1,6 +1,7 @@
 "use server";
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { getActiveBrandId } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 import type { AudienceRules } from "./campaigns";
 
@@ -120,11 +121,15 @@ export async function sendCampaign(campaignId: string, brandId?: string): Promis
   const adminUser = await getAdminUser();
   if (!adminUser) return { success: false, error: "Not authenticated" };
 
-  // Resolve brand from campaign or parameter
-  const effectiveBrandId = brandId ?? adminUser.brand_id;
+  // Resolve brand from campaign or parameter (URL > cookie > legacy > first of brand_ids)
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  if (!activeBrandId && adminUser.role !== "platform_admin") {
+    return { success: false, error: "Brand access required" };
+  }
+  const effectiveBrandId = activeBrandId;
 
   // Brand scoping: brand_admin can only send their own brand's campaigns
-  if (adminUser.role === "brand_admin" && effectiveBrandId && adminUser.brand_id !== effectiveBrandId) {
+  if (adminUser.role === "brand_admin" && effectiveBrandId && !adminUser.brand_ids.includes(effectiveBrandId)) {
     return { success: false, error: "Not authorized to send this brand's campaigns" };
   }
 

src/actions/communications/templates.ts

@@ -1,6 +1,7 @@
 "use server";
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { getActiveBrandId } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 import type { AudienceRules } from "./campaigns";
 
@@ -33,7 +34,11 @@ export async function getCommunicationTemplates(brandId?: string): Promise<{ suc
   const adminUser = await getAdminUser();
   if (!adminUser) return { success: false, error: "Not authenticated" };
 
-  const effectiveBrandId = brandId ?? adminUser.brand_id ?? null;
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  if (!activeBrandId && adminUser.role !== "platform_admin") {
+    return { success: false, error: "Brand access required" };
+  }
+  const effectiveBrandId = activeBrandId;
 
   // Brand scoping: brand_admin can only see their own brand's templates
   if (adminUser.role === "brand_admin" && effectiveBrandId && effectiveBrandId !== adminUser.brand_id) {
@@ -112,7 +117,7 @@ export async function getTemplateById(templateId: string): Promise<Template | nu
     {
       method: "POST",
       headers: { ...svcHeaders(supabaseKey), "Content-Type": "application/json" },
-      body: JSON.stringify({ p_brand_id: adminUser.brand_id ?? null }),
+      body: JSON.stringify({ p_brand_id: (await getActiveBrandId(adminUser)) ?? null }),
     }
   );
 

src/actions/dashboard.ts

@@ -1,6 +1,7 @@
 "use server";
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { getActiveBrandId } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 
 const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
@@ -66,7 +67,7 @@ export async function getDashboardStats(): Promise<DashboardStats> {
     const adminUser = await getAdminUser();
     if (!adminUser) throw new Error("Not authenticated");
 
-    const brandId = adminUser.brand_id ?? null;
+    const brandId = await getActiveBrandId(adminUser);
 
     // Get today's date range
     const today = new Date();
@@ -202,7 +203,7 @@ export async function getDashboardSummary(): Promise<DashboardSummary> {
     const adminUser = await getAdminUser();
     if (!adminUser) throw new Error("Not authenticated");
 
-    const brandId = adminUser.brand_id ?? null;
+    const brandId = await getActiveBrandId(adminUser);
     const thirtyDaysAgo = new Date();
     thirtyDaysAgo.setDate(thirtyDaysAgo.getDate() - 30);
 

src/actions/locations.ts

@@ -2,6 +2,7 @@
 
 import { revalidateTag } from "next/cache";
 import { getAdminUser } from "@/lib/admin-permissions";
+import { getActiveBrandId } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 
 export type LocationInput = {
@@ -48,7 +49,11 @@ export async function createLocation(
   if (!adminUser.can_manage_stops) {
     return { success: false, error: "Not authorized to manage locations" };
   }
-  const effectiveBrandId = brandId || adminUser.brand_id;
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  if (!activeBrandId && adminUser.role !== "platform_admin") {
+    return { success: false, error: "Brand access required" };
+  }
+  const effectiveBrandId = activeBrandId;
   if (!effectiveBrandId) return { success: false, error: "No brand selected" };
 
   const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
@@ -96,7 +101,11 @@ export async function createLocationsBatch(
   if (!adminUser.can_manage_stops) {
     return { success: false, created: 0, error: "Not authorized" };
   }
-  const effectiveBrandId = brandId || adminUser.brand_id;
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  if (!activeBrandId && adminUser.role !== "platform_admin") {
+    return { success: false, created: 0, error: "Brand access required" };
+  }
+  const effectiveBrandId = activeBrandId;
   if (!effectiveBrandId) return { success: false, created: 0, error: "No brand selected" };
 
   const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
@@ -206,7 +215,8 @@ export async function adminListLocations(
 
   // Application-layer brand scoping: platform_admin (brand_id: null) gets all
   // brands; everyone else gets only their own brand.
-  const effectiveBrandId = brandId || adminUser.brand_id;
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  const effectiveBrandId = activeBrandId;
 
   const res = await fetch(
     `${supabaseUrl}/rest/v1/rpc/admin_list_locations`,

src/actions/orders/create-admin-order.ts

@@ -1,6 +1,7 @@
 "use server";
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { getActiveBrandId } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 import { randomUUID } from "crypto";
 
@@ -41,7 +42,11 @@ export async function createAdminOrder(
   }
 
   // Brand scoping
-  const effectiveBrandId = brandId ?? adminUser.brand_id ?? null;
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  if (!activeBrandId && adminUser.role !== "platform_admin") {
+    return { success: false, error: "Brand access required" };
+  }
+  const effectiveBrandId = activeBrandId;
   if (adminUser.role === "brand_admin" && adminUser.brand_id && effectiveBrandId !== adminUser.brand_id) {
     return { success: false, error: "Not authorized for this brand" };
   }

src/actions/payments.ts

@@ -1,6 +1,7 @@
 "use server";
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { assertBrandAccess } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 
 export type PaymentProvider = "stripe" | "square" | "manual";
@@ -65,10 +66,9 @@ export async function savePaymentSettings(params: {
     return { success: false, error: "Not authorized" };
   }
 
-  if (
-    adminUser.role === "brand_admin" &&
-    adminUser.brand_id !== params.brandId
-  ) {
+  try {
+    assertBrandAccess(adminUser, params.brandId);
+  } catch {
     return { success: false, error: "Not authorized for this brand" };
   }
 

src/actions/products.ts

@@ -1,6 +1,7 @@
 "use server";
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { getActiveBrandId } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 
 export async function deleteProduct(
@@ -16,7 +17,11 @@ export async function deleteProduct(
     return { success: false, error: "Not authorized to manage products" };
   }
 
-  const effectiveBrandId = brandId ?? adminUser.brand_id ?? null;
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  if (!activeBrandId && adminUser.role !== "platform_admin") {
+    return { success: false, error: "Brand access required" };
+  }
+  const effectiveBrandId = activeBrandId;
 
   const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
   const supabaseKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!;

src/actions/route-trace/lots.ts

@@ -1,6 +1,7 @@
 "use server";
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { getActiveBrandId, assertBrandAccess } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 
 const SUPABASE_URL = process.env.NEXT_PUBLIC_SUPABASE_URL!;
@@ -153,7 +154,14 @@ export interface FieldYieldSummary {
 export async function getRouteTraceLots(brandId: string, status?: string) {
   const adminUser = await getAdminUser();
   if (!adminUser) return { success: false, error: "Unauthorized" };
-  const effectiveBrandId = brandId ?? adminUser.brand_id ?? undefined;
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  if (!activeBrandId && adminUser.role !== "platform_admin") {
+    return { success: false, error: "Brand access required" };
+  }
+  if (activeBrandId) {
+    try { assertBrandAccess(adminUser, activeBrandId); } catch { return { success: false, error: "Brand access denied" }; }
+  }
+  const effectiveBrandId = activeBrandId ?? undefined;
   if (!effectiveBrandId) return { success: false, error: "No brand" };
 
   try {
@@ -235,7 +243,14 @@ export async function createHarvestLot(
 ) {
   const adminUser = await getAdminUser();
   if (!adminUser) return { success: false, error: "Unauthorized" };
-  const effectiveBrandId = brandId ?? adminUser.brand_id ?? undefined;
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  if (!activeBrandId && adminUser.role !== "platform_admin") {
+    return { success: false, error: "Brand access required" };
+  }
+  if (activeBrandId) {
+    try { assertBrandAccess(adminUser, activeBrandId); } catch { return { success: false, error: "Brand access denied" }; }
+  }
+  const effectiveBrandId = activeBrandId ?? undefined;
   if (!effectiveBrandId) return { success: false, error: "No brand" };
 
   try {
@@ -298,7 +313,14 @@ export async function updateHarvestLotStatus(
 export async function getRouteTraceStats(brandId: string) {
   const adminUser = await getAdminUser();
   if (!adminUser) return { success: false, error: "Unauthorized" };
-  const effectiveBrandId = brandId ?? adminUser.brand_id ?? undefined;
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  if (!activeBrandId && adminUser.role !== "platform_admin") {
+    return { success: false, error: "Brand access required" };
+  }
+  if (activeBrandId) {
+    try { assertBrandAccess(adminUser, activeBrandId); } catch { return { success: false, error: "Brand access denied" }; }
+  }
+  const effectiveBrandId = activeBrandId ?? undefined;
   if (!effectiveBrandId) return { success: false, error: "No brand" };
 
   try {
@@ -318,7 +340,14 @@ export async function getRouteTraceStats(brandId: string) {
 export async function searchHarvestLots(brandId: string, query: string) {
   const adminUser = await getAdminUser();
   if (!adminUser) return { success: false, error: "Unauthorized" };
-  const effectiveBrandId = brandId ?? adminUser.brand_id ?? undefined;
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  if (!activeBrandId && adminUser.role !== "platform_admin") {
+    return { success: false, error: "Brand access required" };
+  }
+  if (activeBrandId) {
+    try { assertBrandAccess(adminUser, activeBrandId); } catch { return { success: false, error: "Brand access denied" }; }
+  }
+  const effectiveBrandId = activeBrandId ?? undefined;
   if (!effectiveBrandId) return { success: false, error: "No brand" };
 
   try {
@@ -347,7 +376,14 @@ export async function getTraceChain(lotId: string) {
 export async function getHarvestLotsReadyToHaul(brandId: string) {
   const adminUser = await getAdminUser();
   if (!adminUser) return { success: false, error: "Unauthorized" };
-  const effectiveBrandId = brandId ?? adminUser.brand_id ?? undefined;
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  if (!activeBrandId && adminUser.role !== "platform_admin") {
+    return { success: false, error: "Brand access required" };
+  }
+  if (activeBrandId) {
+    try { assertBrandAccess(adminUser, activeBrandId); } catch { return { success: false, error: "Brand access denied" }; }
+  }
+  const effectiveBrandId = activeBrandId ?? undefined;
   if (!effectiveBrandId) return { success: false, error: "No brand" };
 
   try {
@@ -364,7 +400,14 @@ export async function getHarvestLotsReadyToHaul(brandId: string) {
 export async function getFieldYieldSummary(brandId: string) {
   const adminUser = await getAdminUser();
   if (!adminUser) return { success: false, error: "Unauthorized" };
-  const effectiveBrandId = brandId ?? adminUser.brand_id ?? undefined;
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  if (!activeBrandId && adminUser.role !== "platform_admin") {
+    return { success: false, error: "Brand access required" };
+  }
+  if (activeBrandId) {
+    try { assertBrandAccess(adminUser, activeBrandId); } catch { return { success: false, error: "Brand access denied" }; }
+  }
+  const effectiveBrandId = activeBrandId ?? undefined;
   if (!effectiveBrandId) return { success: false, error: "No brand" };
 
   try {
@@ -405,7 +448,14 @@ export interface InventoryByCrop {
 export async function getInventoryByCrop(brandId: string): Promise<{ success: true; inventory: InventoryByCrop[] } | { success: false; error: string }> {
   const adminUser = await getAdminUser();
   if (!adminUser) return { success: false, error: "Unauthorized" };
-  const effectiveBrandId = brandId ?? adminUser.brand_id ?? undefined;
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  if (!activeBrandId && adminUser.role !== "platform_admin") {
+    return { success: false, error: "Brand access required" };
+  }
+  if (activeBrandId) {
+    try { assertBrandAccess(adminUser, activeBrandId); } catch { return { success: false, error: "Brand access denied" }; }
+  }
+  const effectiveBrandId = activeBrandId ?? undefined;
   if (!effectiveBrandId) return { success: false, error: "No brand" };
 
   try {
@@ -451,7 +501,14 @@ export async function getRecentLotEvents(
 ): Promise<{ success: true; events: RecentLotEvent[] } | { success: false; error: string }> {
   const adminUser = await getAdminUser();
   if (!adminUser) return { success: false, error: "Unauthorized" };
-  const effectiveBrandId = brandId ?? adminUser.brand_id ?? undefined;
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  if (!activeBrandId && adminUser.role !== "platform_admin") {
+    return { success: false, error: "Brand access required" };
+  }
+  if (activeBrandId) {
+    try { assertBrandAccess(adminUser, activeBrandId); } catch { return { success: false, error: "Brand access denied" }; }
+  }
+  const effectiveBrandId = activeBrandId ?? undefined;
   if (!effectiveBrandId) return { success: false, error: "No brand" };
 
   try {

src/actions/set-active-brand.ts

@@ -0,0 +1,47 @@
+"use server";
+
+import { getAdminUser } from "@/lib/admin-permissions";
+import {
+  setActiveBrandCookie,
+  clearActiveBrandCookie,
+} from "@/lib/brand-scope";
+
+/**
+ * Set the persistent "active brand" for the current admin user.
+ *
+ * - `brandId === null`: "All brands" — only allowed for platform_admin.
+ *   Clears the cookie (cookie absence = no specific brand pinned).
+ * - `brandId` string: sets the cookie, after validating the admin has access.
+ *
+ * The active brand is the default the UI uses for pages that don't receive
+ * an explicit `brandId` from the URL. The cookie is the source of truth —
+ * the URL is only for deep-linking.
+ */
+export async function setActiveBrand(
+  brandId: string | null
+): Promise<{ success: boolean; error?: string }> {
+  const adminUser = await getAdminUser();
+  if (!adminUser) return { success: false, error: "Not authenticated" };
+
+  // null = "All brands" (platform_admin only)
+  if (brandId === null) {
+    if (adminUser.role !== "platform_admin") {
+      return {
+        success: false,
+        error: "Only platform admins can select 'All brands'",
+      };
+    }
+    await clearActiveBrandCookie();
+    return { success: true };
+  }
+
+  if (
+    adminUser.role !== "platform_admin" &&
+    !adminUser.brand_ids.includes(brandId)
+  ) {
+    return { success: false, error: "No access to that brand" };
+  }
+
+  await setActiveBrandCookie(brandId);
+  return { success: true };
+}

src/actions/shipping.ts

@@ -1,6 +1,7 @@
 "use server";
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { getActiveBrandId } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 
 export type UpdateShippingStatusResult =
@@ -28,7 +29,7 @@ export async function updateShippingStatus(
         p_order_id: orderId,
         p_shipping_status: status,
         p_tracking_number: trackingNumber ?? null,
-        p_brand_id: adminUser.brand_id ?? null,
+        p_brand_id: await getActiveBrandId(adminUser),
       }),
     }
   );
@@ -79,7 +80,7 @@ export async function getShippingOrders(): Promise<GetShippingOrdersResult> {
       method: "POST",
       headers: { ...svcHeaders(supabaseKey), "Content-Type": "application/json" },
       body: JSON.stringify({
-        p_brand_id: adminUser.brand_id ?? null,
+        p_brand_id: await getActiveBrandId(adminUser),
       }),
     }
   );

src/actions/shipping/fedex-labels.ts

@@ -1,6 +1,7 @@
 "use server";
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { assertBrandAccess } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 import type { FedExServiceType } from "./fedex-rates";
 
@@ -156,6 +157,10 @@ export async function createFedExShipment(
   const order = orders[0];
   if (!order) return { success: false, error: "Order not found" };
 
+  // The order's brand is the source of truth. Validate the admin has access.
+  if (order.brand_id) {
+    try { assertBrandAccess(adminUser, order.brand_id); } catch { return { success: false, error: "Brand access denied" }; }
+  }
   const effectiveBrandId = order.brand_id ?? adminUser.brand_id ?? null;
 
   // Get FedEx settings

src/actions/shipping/fedex-rates.ts

@@ -11,6 +11,7 @@
  */
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { assertBrandAccess } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 
 // ── Types ────────────────────────────────────────────────────────────────────
@@ -177,6 +178,10 @@ export async function getFedExRates(
   const order = orders[0];
   if (!order) return { success: false, error: "Order not found" };
 
+  // The order's brand is the source of truth. Validate the admin has access.
+  if (order.brand_id) {
+    try { assertBrandAccess(adminUser, order.brand_id); } catch { return { success: false, error: "Brand access denied" }; }
+  }
   const effectiveBrandId = order.brand_id ?? adminUser.brand_id ?? null;
 
   // Fetch shipping settings for this brand

src/actions/square-sync-ui.ts

@@ -1,6 +1,7 @@
 "use server";
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { assertBrandAccess } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 
 export type SyncLogEntry = {
@@ -29,7 +30,9 @@ export async function syncSquareNow(
   const adminUser = await getAdminUser();
   if (!adminUser) return { success: false, synced: 0, errors: ["Not authenticated"] };
   if (!adminUser.can_manage_orders) return { success: false, synced: 0, errors: ["Not authorized"] };
-  if (adminUser.role === "brand_admin" && adminUser.brand_id !== brandId) {
+  try {
+    assertBrandAccess(adminUser, brandId);
+  } catch {
     return { success: false, synced: 0, errors: ["Not authorized"] };
   }
 
@@ -61,7 +64,9 @@ export async function getSyncLog(brandId: string): Promise<{
   const adminUser = await getAdminUser();
   if (!adminUser) return { success: false, logs: [] };
   if (!adminUser.can_manage_orders) return { success: false, logs: [] };
-  if (adminUser.role === "brand_admin" && adminUser.brand_id !== brandId) {
+  try {
+    assertBrandAccess(adminUser, brandId);
+  } catch {
     return { success: false, logs: [] };
   }
 

src/actions/stops.ts

@@ -2,6 +2,7 @@
 
 import { revalidateTag } from "next/cache";
 import { getAdminUser } from "@/lib/admin-permissions";
+import { getActiveBrandId } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 
 export type StopImportRow = {
@@ -25,7 +26,11 @@ export async function createStopsBatch(
     return { success: false, created: 0, error: "Not authorized to manage stops" };
   }
 
-  const effectiveBrandId = brandId || adminUser.brand_id;
+  const activeBrandId = await getActiveBrandId(adminUser, brandId);
+  if (!activeBrandId && adminUser.role !== "platform_admin") {
+    return { success: false, created: 0, error: "Brand access required" };
+  }
+  const effectiveBrandId = activeBrandId;
   if (!effectiveBrandId) {
     return { success: false, created: 0, error: "No brand selected" };
   }

src/actions/water-log/admin.ts

@@ -1,6 +1,7 @@
 "use server";
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { getActiveBrandId } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 
 type Irrigator = {
@@ -94,7 +95,7 @@ export async function updateWaterHeadgate(
         p_name: name,
         p_active: active,
         p_unit: unit ?? null,
-        p_brand_id: adminUser.brand_id ?? null,
+        p_brand_id: (await getActiveBrandId(adminUser)) ?? null,
         p_high_threshold: highThreshold ?? null,
         p_low_threshold: lowThreshold ?? null,
       }),
@@ -186,7 +187,7 @@ export async function updateWaterIrrigator(
         p_active: active,
         p_lang: lang,
         p_role: role,
-        p_brand_id: adminUser.brand_id ?? null,
+        p_brand_id: (await getActiveBrandId(adminUser)) ?? null,
       }),
     }
   );
@@ -215,7 +216,7 @@ export async function resetWaterIrrigatorPin(
       headers: { ...svcHeaders(supabaseKey), "Content-Type": "application/json" },
       body: JSON.stringify({
         p_user_id: irrigatorId,
-        p_brand_id: adminUser.brand_id ?? null,
+        p_brand_id: (await getActiveBrandId(adminUser)) ?? null,
       }),
     }
   );
@@ -242,7 +243,7 @@ export async function deleteWaterUser(userId: string): Promise<{ success: boolea
       headers: { ...svcHeaders(supabaseKey), "Content-Type": "application/json" },
       body: JSON.stringify({
         p_user_id: userId,
-        p_brand_id: adminUser.brand_id ?? null,
+        p_brand_id: (await getActiveBrandId(adminUser)) ?? null,
       }),
     }
   );
@@ -269,7 +270,7 @@ export async function deleteWaterHeadgate(headgateId: string): Promise<{ success
       headers: { ...svcHeaders(supabaseKey), "Content-Type": "application/json" },
       body: JSON.stringify({
         p_headgate_id: headgateId,
-        p_brand_id: adminUser.brand_id ?? null,
+        p_brand_id: (await getActiveBrandId(adminUser)) ?? null,
       }),
     }
   );
@@ -356,7 +357,7 @@ export async function regenerateHeadgateToken(headgateId: string): Promise<{ suc
     {
       method: "POST",
       headers: { ...svcHeaders(supabaseKey), "Content-Type": "application/json" },
-      body: JSON.stringify({ p_headgate_id: headgateId, p_brand_id: adminUser.brand_id ?? null }),
+      body: JSON.stringify({ p_headgate_id: headgateId, p_brand_id: (await getActiveBrandId(adminUser)) ?? null }),
     }
   );
 
@@ -392,7 +393,7 @@ export async function updateWaterEntry(
         p_measurement: measurement,
         p_notes: notes,
         p_unit: unit ?? null,
-        p_brand_id: adminUser.brand_id ?? null,
+        p_brand_id: (await getActiveBrandId(adminUser)) ?? null,
       }),
     }
   );
@@ -421,7 +422,7 @@ export async function deleteWaterEntry(
       headers: { ...svcHeaders(supabaseKey), "Content-Type": "application/json" },
       body: JSON.stringify({
         p_entry_id: entryId,
-        p_brand_id: adminUser.brand_id ?? null,
+        p_brand_id: (await getActiveBrandId(adminUser)) ?? null,
       }),
     }
   );

src/actions/wholesale-register.ts

@@ -1,6 +1,7 @@
 "use server";
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { assertBrandAccess } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 
 export async function registerWholesaleCustomer(params: {
@@ -81,7 +82,9 @@ export async function approveWholesaleRegistration(
   const adminUser = await getAdminUser();
   if (!adminUser) return { success: false, error: "Not authenticated" };
   if (!adminUser.can_manage_orders) return { success: false, error: "Not authorized" };
-  if (adminUser.role !== "platform_admin" && adminUser.brand_id !== brandId) {
+  try {
+    assertBrandAccess(adminUser, brandId);
+  } catch {
     return { success: false, error: "Not authorized to operate on this brand" };
   }
 

src/actions/wholesale.ts

@@ -1,6 +1,7 @@
 "use server";
 
 import { getAdminUser } from "@/lib/admin-permissions";
+import { getActiveBrandId } from "@/lib/brand-scope";
 import { svcHeaders } from "@/lib/svc-headers";
 
 export type WholesaleOrder = {
@@ -129,15 +130,16 @@ export type WholesaleDashboardStats = {
  * platform_admin  → null (means "all brands" — passes to RPC unchanged)
  * brand_admin    → their own brand_id only; rejects attempts to operate on other brands
  * store_employee → their own brand_id
+ * multi_brand_admin → active brand from cookie/URL/legacy, must be in brand_ids
  * unauthenticated → null (actions should already bail out earlier)
  *
  * This prevents brand_admin from seeing or modifying another brand's data
  * even if they manually pass a different brandId to the action.
  */
-function resolveBrandId(
+async function resolveBrandId(
   adminUser: Awaited<ReturnType<typeof getAdminUser>>,
   requestedBrandId?: string
-): string | null {
+): Promise<string | null> {
   if (!adminUser) return null;
 
   if (adminUser.role === "platform_admin") {
@@ -145,15 +147,15 @@ function resolveBrandId(
     return null;
   }
 
-  // brand_admin and store_employee are scoped to their own brand
-  const userBrand = adminUser.brand_id ?? null;
+  // For non-platform-admin: resolve the active brand (validates against brand_ids)
+  const activeBrandId = await getActiveBrandId(adminUser, requestedBrandId);
 
-  if (requestedBrandId && requestedBrandId !== userBrand) {
+  if (requestedBrandId && activeBrandId !== requestedBrandId) {
     // Brand admin trying to operate on another brand's data — block it
     return null; // caller should check and return unauthorized
   }
 
-  return userBrand;
+  return activeBrandId;
 }
 
 /**
@@ -161,23 +163,24 @@ function resolveBrandId(
  * if a brand_admin tries to operate outside their brand.
  * Use for mutating actions (save, delete, fulfill) where cross-brand access must be blocked.
  */
-function enforceBrandScope(
+async function enforceBrandScope(
   adminUser: Awaited<ReturnType<typeof getAdminUser>>,
   requestedBrandId?: string
-): { brandId: string | null; error?: string } {
+): Promise<{ brandId: string | null; error?: string }> {
   if (!adminUser) return { brandId: null, error: "Not authenticated" };
 
   if (adminUser.role === "platform_admin") {
     return { brandId: null }; // unrestricted
   }
 
-  const userBrand = adminUser.brand_id ?? null;
+  // For non-platform-admin: resolve the active brand (validates against brand_ids)
+  const activeBrandId = await getActiveBrandId(adminUser, requestedBrandId);
 
-  if (requestedBrandId && requestedBrandId !== userBrand) {
+  if (requestedBrandId && activeBrandId !== requestedBrandId) {
     return { brandId: null, error: "Not authorized to operate on this brand" };
   }
 
-  return { brandId: userBrand };
+  return { brandId: activeBrandId };
 }
 
 // ── Orders ──────────────────────────────────────────────────────────────────
@@ -185,7 +188,7 @@ function enforceBrandScope(
 export async function getWholesaleOrders(brandId?: string): Promise<WholesaleOrder[]> {
   const adminUser = await getAdminUser();
   if (!adminUser) return [];
-  const bid = resolveBrandId(adminUser, brandId);
+  const bid = await resolveBrandId(adminUser, brandId);
 
   const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
   const supabaseKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!;
@@ -209,7 +212,7 @@ export async function getWholesaleOrders(brandId?: string): Promise<WholesaleOrd
 export async function getWholesalePickupOrders(brandId?: string): Promise<WholesaleOrder[]> {
   const adminUser = await getAdminUser();
   if (!adminUser) return [];
-  const bid = resolveBrandId(adminUser, brandId);
+  const bid = await resolveBrandId(adminUser, brandId);
 
   const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
   const supabaseKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!;
@@ -256,7 +259,7 @@ export async function markWholesaleOrderFulfilled(orderId: string, brandId?: str
   if (!adminUser) return { success: false, error: "Not authenticated" };
   if (!adminUser.can_manage_orders) return { success: false, error: "Not authorized" };
 
-  const { brandId: resolved, error } = enforceBrandScope(adminUser, brandId);
+  const { brandId: resolved, error } = await enforceBrandScope(adminUser, brandId);
   if (error) return { success: false, error };
 
   const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
@@ -305,7 +308,7 @@ export async function updateWholesaleOrderStatus(
   if (!adminUser) return { success: false, error: "Not authenticated" };
   if (!adminUser.can_manage_orders) return { success: false, error: "Not authorized" };
 
-  const { error } = enforceBrandScope(adminUser, brandId);
+  const { error } = await enforceBrandScope(adminUser, brandId);
   if (error) return { success: false, error };
 
   const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
@@ -332,7 +335,7 @@ export async function deleteWholesaleOrder(orderId: string, brandId?: string): P
   if (!adminUser) return { success: false, error: "Not authenticated" };
   if (!adminUser.can_manage_orders) return { success: false, error: "Not authorized" };
 
-  const { error } = enforceBrandScope(adminUser, brandId);
+  const { error } = await enforceBrandScope(adminUser, brandId);
   if (error) return { success: false, error };
 
   const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
@@ -359,7 +362,7 @@ export async function deleteWholesaleCustomer(customerId: string, brandId?: stri
   if (!adminUser) return { success: false, error: "Not authenticated" };
   if (!adminUser.can_manage_orders) return { success: false, error: "Not authorized" };
 
-  const { error } = enforceBrandScope(adminUser, brandId);
+  const { error } = await enforceBrandScope(adminUser, brandId);
   if (error) return { success: false, error };
 
   const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
@@ -388,7 +391,7 @@ export async function deleteWholesaleProduct(productId: string, brandId?: string
   if (!adminUser) return { success: false, error: "Not authenticated" };
   if (!adminUser.can_manage_products) return { success: false, error: "Not authorized" };
 
-  const { error } = enforceBrandScope(adminUser, brandId);
+  const { error } = await enforceBrandScope(adminUser, brandId);
   if (error) return { success: false, error };
 
   const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
@@ -417,7 +420,7 @@ export async function deleteWholesaleProduct(productId: string, brandId?: string
 export async function getWholesaleCustomers(brandId?: string): Promise<WholesaleCustomer[]> {
   const adminUser = await getAdminUser();
   if (!adminUser) return [];
-  const bid = resolveBrandId(adminUser, brandId);
+  const bid = await resolveBrandId(adminUser, brandId);
 
   const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
   const supabaseKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!;
@@ -458,7 +461,7 @@ export async function saveWholesaleCustomer(params: {
   if (!adminUser) return { success: false, error: "Not authenticated" };
   if (!adminUser.can_manage_orders) return { success: false, error: "Not authorized" };
 
-  const { error } = enforceBrandScope(adminUser, params.brandId);
+  const { error } = await enforceBrandScope(adminUser, params.brandId);
   if (error) return { success: false, error };
 
   const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
@@ -501,7 +504,7 @@ export async function saveWholesaleCustomer(params: {
 export async function getWholesaleProducts(brandId?: string): Promise<WholesaleProduct[]> {
   const adminUser = await getAdminUser();
   if (!adminUser) return [];
-  const bid = resolveBrandId(adminUser, brandId);
+  const bid = await resolveBrandId(adminUser, brandId);
 
   const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
   const supabaseKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!;
@@ -545,7 +548,7 @@ export async function saveWholesaleProduct(params: {
   if (!adminUser) return { success: false, error: "Not authenticated" };
   if (!adminUser.can_manage_products) return { success: false, error: "Not authorized" };
 
-  const { error } = enforceBrandScope(adminUser, params.brandId);
+  const { error } = await enforceBrandScope(adminUser, params.brandId);
   if (error) return { success: false, error };
 
   const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
@@ -591,7 +594,10 @@ export async function saveWholesaleProduct(params: {
 export async function getWholesaleSettings(brandId?: string): Promise<WholesaleSettings | null> {
   const adminUser = await getAdminUser();
   if (!adminUser) return null;
-  const bid = brandId ?? adminUser.brand_id ?? null;
+  const bid = await getActiveBrandId(adminUser, brandId);
+  if (!bid && adminUser.role !== "platform_admin") {
+    return null;
+  }
 
   const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!;
   const supabaseKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!;
@@ -700,7 +706,7 @@ export async function recordWholesaleDeposit(
         p_method: method,
         p_reference: reference ?? null,
         p_recorded_by: adminUser.user_id,
-        p_brand_id: adminUser.brand_id ?? null,
+        p_brand_id: await getActiveBrandId(adminUser),
       }),
     }
   );
@@ -710,7 +716,7 @@ export async function recordWholesaleDeposit(
   if (!data?.success) return { success: false, error: data?.error ?? "Failed to record deposit" };
 
   // Fire webhook — fire-and-forget
-  enqueueWholesaleWebhookForDepositRecorded(orderId, amount, adminUser.brand_id ?? undefined).catch(() => {});
+  enqueueWholesaleWebhookForDepositRecorded(orderId, amount, (await getActiveBrandId(adminUser)) ?? undefined).catch(() => {});
 
   return { success: true };
 }
@@ -753,7 +759,7 @@ export async function bulkFulfillWholesaleOrders(
       body: JSON.stringify({
         p_order_ids: orderIds,
         p_by: adminUser.user_id,
-        p_brand_id: adminUser.brand_id ?? null,
+        p_brand_id: await getActiveBrandId(adminUser),
       }),
     }
   );
@@ -791,7 +797,7 @@ export async function bulkRecordWholesaleDeposit(
         p_method: method,
         p_reference: reference ?? null,
         p_recorded_by: adminUser.user_id,
-        p_brand_id: adminUser.brand_id ?? null,
+        p_brand_id: await getActiveBrandId(adminUser),
       }),
     }
   );