fix profit value after each order 2

database/sql/backfill_order_product_and_fees.sql

@@ -0,0 +1,28 @@
+-- Backfill helpers for orders (run manually after migrate; test on one row first).
+-- 1) product_id from first related transaction that has product_id
+UPDATE orders o
+INNER JOIN (
+  SELECT order_id, MIN(product_id) AS product_id
+  FROM transactions
+  WHERE order_id IS NOT NULL
+    AND product_id IS NOT NULL
+    AND product_id > 0
+  GROUP BY order_id
+) t ON t.order_id = o.id
+SET o.product_id = t.product_id
+WHERE o.product_id IS NULL;
+
+-- 2) Recalc fee / total_fee / total_price_original from stored prices
+-- Example dry-run for one order:
+-- SELECT id, fee, total_fee,
+--   ABS(price - price_original) AS fee_new,
+--   ABS(amount * (price - price_original)) AS total_fee_new
+-- FROM orders WHERE id = ?;
+
+UPDATE orders
+SET
+  fee = ABS(price - price_original),
+  total_fee = ABS(amount * (price - price_original)),
+  total_price_original = amount * price_original
+WHERE price_original IS NOT NULL
+  AND amount IS NOT NULL;