feat: add stuff

apps/api/prisma/migrations/20261027120000_product_buy_price/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "Product" ADD COLUMN "buyPriceInCents" INTEGER;

apps/api/prisma/migrations/20261027130000_product_desired_stock/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "Product" ADD COLUMN "desiredStock" INTEGER;

apps/api/prisma/schema.prisma

@@ -212,13 +212,18 @@ model Product {
   productId         String
   name              String
   category          String?
+  // The sell price: what the terminals charge
   priceInCents      Int
+  // What the bar pays for one; null when not entered. Kept on the dashboard only, the terminals never get it
+  buyPriceInCents   Int?
   // Null when stock is not tracked for this product. Can be negative: a sale is never blocked.
   stock             Int?
   // When the stock was last counted; line events that happened before it are already in the count
   countedAt         DateTime?
   // Warn when the stock drops to this level
   lowStockThreshold Int?
+  // How many the bar wants in stock; the dashboard shows what to order to get there. Not sent to the terminals
+  desiredStock      Int?
   // When it was created or last changed
   reportedAt        DateTime
   // Deleted on the dashboard: hidden on the terminals, kept because tabs and history refer to it