feat(db): add get_dashboard_summary RPC for v2 dashboard

db/migrations/0091_dashboard_summary_rpc.sql

@@ -0,0 +1,89 @@
+-- 0091_dashboard_summary_rpc.sql
+--
+-- Dashboard summary RPC for the mobile-first admin v2 dashboard
+-- (`/admin/v2`).
+--
+-- Returns a single JSONB document that powers the four stat cards +
+-- the "Today's stops" timeline + the 7-day mini-chart:
+--
+--   {
+--     "orders_today":         <int>,            -- count of orders placed today
+--     "revenue_today":        <int cents>,      -- sum of total_cents (excl. canceled)
+--     "pending_fulfillment":  <int>,            -- count of orders awaiting pickup/ship
+--     "stops_today":          <int>,            -- count of stops scheduled for today
+--     "orders_last_7_days":   [{date, count}]   -- 7-element array, oldest → today
+--   }
+--
+-- Schema notes (vs. the plan's draft):
+--   * `orders` uses `placed_at` (TIMESTAMPTZ) — not `created_at`
+--   * `orders.status` is the legacy enum: 'pending' | 'confirmed' |
+--     'fulfilled' | 'canceled'  (not the v2 vocabulary 'placed'/'ready')
+--   * `orders.total_cents` is INTEGER (NOT NULL DEFAULT 0 in 0001) — no
+--     column-add step is required
+--   * `stops` has a `date DATE` column (not `scheduled_at`); the legacy
+--     stops page (and v2 stops page) both key off `stops.date`
+--
+-- SECURITY DEFINER so the v2 server action can call it without depending
+-- on RLS; brand scoping is enforced inside the function via the
+-- `p_brand_id` parameter (NULL → platform_admin "all brands" scope).
+-- Re-runs are safe — this is `CREATE OR REPLACE FUNCTION`.
+
+CREATE OR REPLACE FUNCTION get_dashboard_summary(p_brand_id UUID)
+RETURNS JSONB
+LANGUAGE plpgsql
+SECURITY DEFINER
+AS $$
+DECLARE
+  result JSONB;
+  brand_filter TEXT;
+BEGIN
+  -- The brand filter is the same text fragment for every SELECT in this
+  -- function. NULL = "all brands" (platform_admin scope); non-NULL =
+  -- scope to a single brand.
+  IF p_brand_id IS NULL THEN
+    brand_filter := '';
+  ELSE
+    brand_filter := format(' AND brand_id = %L', p_brand_id);
+  END IF;
+
+  EXECUTE format(
+    $q$
+    SELECT jsonb_build_object(
+      'orders_today', (
+        SELECT COUNT(*) FROM orders
+        WHERE placed_at::date = CURRENT_DATE %s
+      ),
+      'revenue_today', (
+        SELECT COALESCE(SUM(total_cents), 0)::bigint FROM orders
+        WHERE placed_at::date = CURRENT_DATE
+          AND status <> 'canceled' %s
+      ),
+      'pending_fulfillment', (
+        SELECT COUNT(*) FROM orders
+        WHERE status IN ('pending', 'confirmed') %s
+      ),
+      'stops_today', (
+        SELECT COUNT(*) FROM stops
+        WHERE "date" = CURRENT_DATE %s
+      ),
+      'orders_last_7_days', (
+        SELECT COALESCE(jsonb_agg(jsonb_build_object('date', d::date, 'count', COALESCE(o.cnt, 0)) ORDER BY d), '[]'::jsonb)
+        FROM generate_series(CURRENT_DATE - INTERVAL '6 days', CURRENT_DATE, '1 day') d
+        LEFT JOIN (
+          SELECT placed_at::date AS day, COUNT(*) AS cnt
+          FROM orders
+          WHERE placed_at >= CURRENT_DATE - INTERVAL '7 days' %s
+          GROUP BY 1
+        ) o ON o.day = d::date
+      )
+    )
+    $q$,
+    brand_filter, brand_filter, brand_filter, brand_filter, brand_filter
+  ) INTO result;
+
+  RETURN result;
+END;
+$$;
+
+COMMENT ON FUNCTION get_dashboard_summary(UUID) IS
+  'Returns a single JSONB document with the four dashboard stat counts + 7-day order history. p_brand_id = NULL means platform_admin scope (all brands).';