Fix code review items: atomic qty increment, unit updatedAt, suppliers/all endpoint, SKU unique index

packages/backend/src/services/product.service.ts

@@ -225,7 +225,7 @@ export const InventoryUnitService = {
       if (!valid) throw new ValidationError(`Invalid status: "${input.status}"`)
     }
 
-    const updates: Record<string, unknown> = { ...input }
+    const updates: Record<string, unknown> = { ...input, updatedAt: new Date() }
     if (input.purchaseCost !== undefined) updates.purchaseCost = input.purchaseCost.toString()
 
     const [unit] = await db
@@ -317,14 +317,11 @@ export const StockReceiptService = {
       })
       .returning()
 
-    // For non-serialized products, increment qty_on_hand
-    const [product] = await db.select().from(products).where(eq(products.id, productId)).limit(1)
-    if (product && !product.isSerialized) {
-      await db
-        .update(products)
-        .set({ qtyOnHand: product.qtyOnHand + input.qty, updatedAt: new Date() })
-        .where(eq(products.id, productId))
-    }
+    // For non-serialized products, increment qty_on_hand atomically
+    await db
+      .update(products)
+      .set({ qtyOnHand: sql`${products.qtyOnHand} + ${input.qty}`, updatedAt: new Date() })
+      .where(and(eq(products.id, productId), eq(products.isSerialized, false)))
 
     return receipt
   },