fix(pos): physical TPV (cashier) skips inventory check, selfpay still validates

project/src/modules/pos/application/create-pos-sale.ts

@@ -174,6 +174,8 @@ export class CreatePosSaleUseCase {
         throw new AppError(400, 'POS_EMPTY_CART', 'El carrito está vacío');
 
       const lineDiscountsEnabled = session.terminal_settings?.lineDiscountsEnabled !== false;
+      // POS-FIX-12: physical TPV (cashier) trusts real stock — skip inventory check
+      const selfpayMode = session.terminal_settings?.selfpayMode === true;
       let subtotalCents = 0;
       let discountCents = 0;
       let taxCents = 0;
@@ -246,7 +248,10 @@ export class CreatePosSaleUseCase {
             FOR UPDATE`,
           [catalog.variant_id, session.store_id],
         );
-        if (Number(stock.rows[0]?.available ?? 0) < inputItem.quantity) {
+        const availableStock = Number(stock.rows[0]?.available ?? 0);
+        // POS-FIX-12: only selfpay terminals validate against inventory_stock.
+        // Physical (cashier) TPV trusts real stock — the count is allowed to drift.
+        if (selfpayMode && availableStock < inputItem.quantity) {
           throw new AppError(
             409,
             'POS_STOCK_UNAVAILABLE',