feat: Re-compute the given items cost job.

feat: Optimize the architecture.

server/src/interfaces/InventoryCostMethod.ts

@@ -0,0 +1,6 @@
+
+
+interface IInventoryCostMethod {
+  computeItemsCost(fromDate: Date): void,
+  initialize(): void,
+}

server/src/interfaces/InventoryTransaction.ts

@@ -18,6 +18,7 @@ export interface IInventoryLotCost {
   itemId: number,
   rate: number,
   remaining: number,
+  lotNumber: string|number,
   transactionType: string,
   transactionId: string,
 }

server/src/interfaces/index.ts

@@ -0,0 +1,11 @@
+import { IInventoryTransaction, IInventoryLotCost } from './InventoryTransaction';
+import { IBillPaymentEntry, IBillPayment } from './BillPayment';
+import { IInventoryCostMethod } from './IInventoryCostMethod';
+
+export {
+  IBillPaymentEntry,
+  IBillPayment,
+  IInventoryTransaction,
+  IInventoryLotCost,
+  IInventoryCostMethod,
+};