fix: Product type tax overrides (#9951)

* fix: Make product type tax override work

* fix: Make product type tax override work

packages/modules/cart/src/models/line-item.ts

@@ -53,6 +53,13 @@ const ProductIdIndex = createPsqlIndexStatementHelper({
   where: "deleted_at IS NULL AND product_id IS NOT NULL",
 }).MikroORMIndex
 
+const ProductTypeIdIndex = createPsqlIndexStatementHelper({
+  name: "IDX_line_item_product_type_id",
+  tableName: "cart_line_item",
+  columns: "product_type_id",
+  where: "deleted_at IS NULL AND product_type_id IS NOT NULL",
+}).MikroORMIndex
+
 const DeletedAtIndex = createPsqlIndexStatementHelper({
   tableName: "cart_line_item",
   columns: "deleted_at",
@@ -111,6 +118,10 @@ export default class LineItem {
   @Property({ columnType: "text", nullable: true })
   product_type: string | null = null
 
+  @ProductTypeIdIndex()
+  @Property({ columnType: "text", nullable: true })
+  product_type_id: string | null = null
+
   @Property({ columnType: "text", nullable: true })
   product_collection: string | null = null