Update exclusive summary

migrations/000082_add_outlet_id_to_purchase_orders.up.sql

@@ -50,3 +50,17 @@ SET outlet_id = item_outlets.outlet_id
 FROM item_outlets
 WHERE po.id = item_outlets.purchase_order_id
   AND po.outlet_id IS NULL;
+
+WITH single_outlet_organizations AS (
+    SELECT
+        organization_id,
+        MIN(id) AS outlet_id
+    FROM outlets
+    GROUP BY organization_id
+    HAVING COUNT(*) = 1
+)
+UPDATE purchase_orders po
+SET outlet_id = single_outlet_organizations.outlet_id
+FROM single_outlet_organizations
+WHERE po.organization_id = single_outlet_organizations.organization_id
+  AND po.outlet_id IS NULL;