Add SQL query for average cost retrieval and generate TriggerLog model

src/purchase-receipts/purchase-receipts.service.ts

@@ -25,7 +25,6 @@ export class PurchaseReceiptsService {
                 description: item.description ?? null,
                 product: { connect: { id: item.productId } },
               }
-              console.log(`[create] Step 3: Mapped item ${idx}:`, mapped)
               return mapped
             }),
           }