Default to last purchased price and quantity when adding transaction item

Groceries.Data/Migrations/20230728185157_update_item_purchases.sql

@@ -0,0 +1,14 @@
+CREATE OR REPLACE VIEW item_purchases AS
+SELECT
+    item_id,
+    transaction_id,
+    created_at,
+    store_id,
+    price,
+    quantity,
+    CASE ROW_NUMBER() OVER (PARTITION BY item_id ORDER BY created_at DESC)
+        WHEN 1 THEN true
+        ELSE false
+    END AS is_last_purchase
+FROM transaction_items
+JOIN transactions USING (transaction_id);