fix(communications): create email_templates table + resolve platform_admin brand fallback

Two related bugs caused the 'New Template' modal on
/admin/communications to fail with a database error:

1. The `email_templates` table was defined in `db/schema/marketing.ts`
   (Drizzle) but never migrated, so the modal's `upsertTemplate`
   server action errored with 'relation "email_templates" does not
   exist'. Adds migration 0092 to create the table (and `campaigns`)
   to match the Drizzle schema. Uses CREATE TABLE IF NOT EXISTS,
   gen_random_uuid() PKs, and the standard set_updated_at trigger
   pattern from 0001_init.sql.

2. `/admin/communications/page.tsx` resolved `effectiveBrandId`
   with a hard-coded UUID ('64294306-...') for sessions without a
   brand (e.g., dev platform_admin). That UUID isn't in the local
   dev DB (brands are '11111111-...' and '22222222-...'), so the
   modal would FK-violate on insert with 'violates foreign key
   constraint email_templates_brand_id_fkey'. Replaced with a
   `listBrandsForAdmin()` lookup that picks the first accessible
   brand.

3. `listBrandsForAdmin()` (`src/actions/brands.ts`) was SELECTing
   `logo_url` from `brands`, but that column doesn't exist (the
   brands table only has id/name/slug/plan_tier/limits/stripe_*/...).
   The query threw 'column "logo_url" does not exist', got caught
   by the silent try/catch, returned [], which made #2 above render
   the page with brandId="" — and any submit would then error with
   'invalid input syntax for type uuid: ""'. Removed logo_url
   from the SELECT; BrandListItem.logo_url is always null until a
   future migration adds the column.

E2E verified: opening /admin/communications → Templates tab → New
Template → fill name → Create Template inserts a row in
email_templates with the correct brand_id.

db/migrations/0092_email_templates_and_campaigns.sql

@@ -0,0 +1,87 @@
+-- 0092_email_templates_and_campaigns.sql
+--
+-- Creates the `email_templates` and `campaigns` tables referenced by
+-- `db/schema/marketing.ts` (Drizzle). These tables were defined in the
+-- schema but never migrated, so the "Create Template" UI on the
+-- communications page errored with `relation "email_templates" does
+-- not exist`.
+--
+-- A parallel set of tables (`communication_templates`,
+-- `communication_campaigns`) already exists from 0001_init.sql — those
+-- are a different schema used by the Harvest Reach module and are
+-- untouched here. This migration only adds the marketing-schema tables
+-- the `upsertTemplate` / `createCampaign` actions need.
+--
+-- Conventions (mirror 0001_init.sql):
+--   - gen_random_uuid() for PKs
+--   - TIMESTAMPTZ for timestamps
+--   - TEXT + CHECK for the campaigns.status enum
+--   - CREATE TABLE IF NOT EXISTS for re-runnability
+--   - set_updated_at() trigger for updated_at maintenance
+
+BEGIN;
+
+-- ============================================================================
+-- email_templates
+-- ============================================================================
+CREATE TABLE IF NOT EXISTS email_templates (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  brand_id UUID NOT NULL REFERENCES brands(id) ON DELETE CASCADE,
+  name TEXT NOT NULL,
+  subject TEXT NOT NULL,
+  body_html TEXT NOT NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1 FROM pg_trigger t
+    JOIN pg_class c ON t.tgrelid = c.oid
+    JOIN pg_namespace n ON c.relnamespace = n.oid
+    WHERE t.tgname = 'email_templates_set_updated_at' AND n.nspname = current_schema()
+  ) THEN
+    CREATE TRIGGER email_templates_set_updated_at
+      BEFORE UPDATE ON email_templates
+      FOR EACH ROW EXECUTE FUNCTION set_updated_at();
+  END IF;
+END $$;
+
+CREATE INDEX IF NOT EXISTS email_templates_brand_idx ON email_templates (brand_id);
+
+-- ============================================================================
+-- campaigns
+-- ============================================================================
+CREATE TABLE IF NOT EXISTS campaigns (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  brand_id UUID NOT NULL REFERENCES brands(id) ON DELETE CASCADE,
+  template_id UUID REFERENCES email_templates(id) ON DELETE SET NULL,
+  name TEXT NOT NULL,
+  status TEXT NOT NULL DEFAULT 'draft'
+    CHECK (status IN ('draft', 'scheduled', 'sending', 'sent', 'canceled')),
+  scheduled_for TIMESTAMPTZ,
+  sent_at TIMESTAMPTZ,
+  recipient_count INTEGER NOT NULL DEFAULT 0,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1 FROM pg_trigger t
+    JOIN pg_class c ON t.tgrelid = c.oid
+    JOIN pg_namespace n ON c.relnamespace = n.oid
+    WHERE t.tgname = 'campaigns_set_updated_at' AND n.nspname = current_schema()
+  ) THEN
+    CREATE TRIGGER campaigns_set_updated_at
+      BEFORE UPDATE ON campaigns
+      FOR EACH ROW EXECUTE FUNCTION set_updated_at();
+  END IF;
+END $$;
+
+CREATE INDEX IF NOT EXISTS campaigns_brand_idx ON campaigns (brand_id);
+CREATE INDEX IF NOT EXISTS campaigns_status_idx ON campaigns (brand_id, status);
+
+COMMIT;

src/actions/brands.ts

@@ -24,20 +24,20 @@ export async function listBrandsForAdmin(): Promise<BrandListItem[]> {
   try {
     if (adminUser.role === "platform_admin") {
       const { rows } = await pool.query<BrandListItem>(
-        `SELECT id, name, slug, logo_url FROM brands ORDER BY name`,
+        `SELECT id, name, slug FROM brands ORDER BY name`,
       );
-      return rows;
+      return rows.map((r) => ({ ...r, logo_url: null }));
     }
 
     if (adminUser.brand_ids.length === 0) return [];
 
     const { rows } = await pool.query<BrandListItem>(
-      `SELECT id, name, slug, logo_url FROM brands
+      `SELECT id, name, slug FROM brands
        WHERE id = ANY($1::uuid[])
        ORDER BY name`,
       [adminUser.brand_ids],
     );
-    return rows;
+    return rows.map((r) => ({ ...r, logo_url: null }));
   } catch {
     return [];
   }

src/app/admin/communications/page.tsx

@@ -5,6 +5,7 @@ import { getCommunicationCampaigns } from "@/actions/communications/campaigns";
 import { getCommunicationTemplates } from "@/actions/communications/templates";
 import { getHarvestReachSegments } from "@/actions/harvest-reach/segments";
 import { getCampaignAnalytics } from "@/actions/harvest-reach/campaigns";
+import { listBrandsForAdmin } from "@/actions/brands";
 import CommunicationsPage from "@/components/admin/CommunicationsPage";
 
 export const metadata: Metadata = {
@@ -18,7 +19,29 @@ export default async function CommunicationsRootPage() {
     redirect("/admin/pickup");
   }
 
-  const effectiveBrandId = adminUser!.brand_id ?? "64294306-5f42-463d-a5e8-2ad6c81a96de";
+  // Resolve a real brand id. For platform_admin (and any other session
+  // without an explicit brand), fall back to the first accessible brand
+  // rather than a hard-coded UUID — the previous fallback was tied to
+  // a specific DB and would FK-violate anywhere else, breaking the
+  // "Create Template" / "New Campaign" forms with "violates foreign
+  // key constraint email_templates_brand_id_fkey".
+  let effectiveBrandId = adminUser!.brand_id ?? null;
+  if (!effectiveBrandId) {
+    const brands = await listBrandsForAdmin();
+    effectiveBrandId = brands[0]?.id ?? null;
+  }
+  if (!effectiveBrandId) {
+    // No brands exist — render the page with empty data rather than crash.
+    return (
+      <CommunicationsPage
+        campaigns={[]}
+        templates={[]}
+        brandId=""
+        initialSegments={[]}
+        initialAnalytics={{ success: true, analytics: null }}
+      />
+    );
+  }
 
   const [campaignsResult, templatesResult, segmentsResult, analyticsResult] = await Promise.all([
     getCommunicationCampaigns(effectiveBrandId),