fix: correlate downstream receipts with submit responses

api/src/send-chain/send-chain.service.spec.ts

@@ -551,15 +551,20 @@ describe('SendChainService', () => {
       account: '100001',
       phoneNumber: '13800000001',
       content: 'unreported content',
+      sequenceId: 1216579149,
       remoteIp: '127.0.0.1',
     })).resolves.toEqual(expect.objectContaining({ accepted: true, messageRecordId: 'record-1' }));
 
+    expect(prisma.smsMessageRecord.create).toHaveBeenCalledWith({
+      data: expect.objectContaining({ cmppSubmitSequenceId: '1216579149' }),
+    });
+
     expect(prisma.smsReceiptRecord.create).toHaveBeenCalledWith({
       data: expect.objectContaining({ receiptStatus: 'undelivered', rawStatus: 'REJECTD', errorCode: 'TEMPLATE' }),
     });
     expect(service['postGatewayControl']).toHaveBeenCalledWith(
       '/downstream/receipt',
-      expect.objectContaining({ receiptStatus: 'undelivered', rawStatus: 'REJECTD', errorCode: 'TEMPLATE' }),
+      expect.objectContaining({ receiptStatus: 'undelivered', rawStatus: 'REJECTD', errorCode: 'TEMPLATE', submitSequenceId: 1216579149 }),
     );
     expect(riskReview.aggregateTemplateMismatch).not.toHaveBeenCalled();
   });
@@ -1484,6 +1489,29 @@ describe('SendChainService', () => {
     }));
   });
 
+  it('does not treat Result=0 with Msg_Id=0 as a business acknowledgement', async () => {
+    const { service, prisma } = createService();
+
+    await service.acknowledgeDownstreamDelivery({
+      id: 'delivery-1',
+      connectionId: 'conn-1',
+      sequenceId: '91',
+      messageId: '0',
+      result: 0,
+      acknowledgedAt: '2026-07-14T07:07:49.336Z',
+    });
+
+    expect(prisma.cmppDownstreamDelivery.updateMany).toHaveBeenCalledWith(expect.objectContaining({
+      data: expect.objectContaining({ ackResult: 0, ackMessageId: '0' }),
+    }));
+    expect(prisma.cmppDownstreamDelivery.update).toHaveBeenCalledWith(expect.objectContaining({
+      data: expect.objectContaining({ status: 'pending', lastError: expect.stringContaining('Msg_Id=0') }),
+    }));
+    expect(prisma.cmppDownstreamDelivery.updateMany).not.toHaveBeenCalledWith(expect.objectContaining({
+      data: expect.objectContaining({ status: 'delivered' }),
+    }));
+  });
+
   it('does not automatically retry an unacknowledged delivery when its policy snapshot is disabled', async () => {
     const { service, prisma } = createService();
     prisma.cmppDownstreamDelivery.findUnique.mockResolvedValue({
@@ -1564,6 +1592,15 @@ describe('SendChainService', () => {
         resourceId: 'delivery-1',
       }),
     });
+    expect(prisma.cmppDownstreamDelivery.update).toHaveBeenCalledWith(expect.objectContaining({
+      data: expect.objectContaining({
+        status: 'pending',
+        acknowledgedAt: null,
+        ackResult: null,
+        ackMessageId: null,
+        deliveredAt: null,
+      }),
+    }));
   });
 
   it('supports batch requeue of downstream deliveries', async () => {