fix(pricing, medusa): resolve minor pricing-module bugs (#5685)

* fix region price updates

* pricing migration: include title/name field value migration

* update migration scripts for pricing module

* move file to script utils

* rename file

* rename file

* add changeset

* remove redundant maps

* update migration script

* nit

* remove unnecessary variable

* filter before map

* array function naming cleanup

* chore: address pr reviews

---------

Co-authored-by: Philip Korsholm <philip.korsholm@hotmail.com>
Co-authored-by: Philip Korsholm <88927411+pKorsholm@users.noreply.github.com>

packages/workflows/src/handlers/product/upsert-variant-prices.ts

@@ -78,29 +78,34 @@ export async function upsertVariantPrices({
     )
 
     for (const price of prices) {
+      const region = price.region_id && regionsMap.get(price.region_id)
+      let region_currency_code: string | undefined
+      let region_rules: Record<string, string> | undefined
+
+      if (region) {
+        region_currency_code = region.currency_code
+        region_rules = {
+          region_id: region.id,
+        }
+      }
+
       if (price.id) {
-        moneyAmountsToUpdate.push({
+        const priceToUpdate = {
           id: price.id,
           min_quantity: price.min_quantity,
           max_quantity: price.max_quantity,
           amount: price.amount,
-          currency_code: price.currency_code,
-        })
+          currency_code: region_currency_code ?? price.currency_code,
+        }
+
+        moneyAmountsToUpdate.push(priceToUpdate)
       } else {
-        const region = price.region_id && regionsMap.get(price.region_id)
         const variantPrice: PricingTypes.CreatePricesDTO = {
           min_quantity: price.min_quantity,
           max_quantity: price.max_quantity,
           amount: price.amount,
-          currency_code: price.currency_code,
-          rules: {},
-        }
-
-        if (region) {
-          variantPrice.currency_code = region.currency_code
-          variantPrice.rules = {
-            region_id: region.id,
-          }
+          currency_code: region_currency_code ?? price.currency_code,
+          rules: region_rules ?? {},
         }
 
         delete price.region_id