fix: simplify balance billing and govern operation logs

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

@@ -249,11 +249,13 @@ function createPrismaMock() {
       updateMany: jest.fn().mockResolvedValue({ count: 1 }),
     },
     gatewayDownstreamRecoveryStatus: {
+      findUnique: jest.fn().mockResolvedValue(null),
       upsert: jest.fn().mockResolvedValue({
         id: 'recover-1',
         tenantId: 'tenant-1',
         applicationId: 'app-1',
         account: '100001',
+        gatewayInstanceId: 'gateway-a',
         state: 'waiting_connection',
         lockOwner: 'gateway-a',
         lockExpiresAt: new Date('2026-07-08T12:00:30.000Z'),
@@ -341,7 +343,7 @@ describe('SendChainService', () => {
         expect.objectContaining({ phoneNumber: '13800000002', status: 'queued', billingUnits: 1, amountCents: 3, queuePriority: 'normal' }),
       ]),
     });
-    expect(billing.freeze).toHaveBeenCalledWith(expect.objectContaining({ amountCents: 6, smsUnits: 2, relatedId: 'task-1' }));
+    expect(billing.freeze).toHaveBeenCalledWith(expect.objectContaining({ amountCents: 6, relatedId: 'task-1' }));
     expect(service.enqueueBatchTask).toHaveBeenCalledWith('task-1');
   });
 
@@ -376,7 +378,7 @@ describe('SendChainService', () => {
       dispatched: 1,
       results: [{ taskId: 'task-1', status: 'queued', enqueued: 1 }],
     });
-    expect(billing.freeze).toHaveBeenCalledWith(expect.objectContaining({ amountCents: 3, smsUnits: 1, relatedId: 'task-1' }));
+    expect(billing.freeze).toHaveBeenCalledWith(expect.objectContaining({ amountCents: 3, relatedId: 'task-1' }));
     expect(prisma.smsMessageRecord.updateMany).toHaveBeenCalledWith({
       where: { batchTaskId: 'task-1', status: 'scheduled' },
       data: { status: 'queued' },
@@ -854,8 +856,8 @@ describe('SendChainService', () => {
       where: { id: 'record-1' },
       data: expect.objectContaining({ gatewayMessageId: 'GW-1', status: 'submitted', submitStatus: 'accepted' }),
     });
-    expect(billing.release).toHaveBeenCalledWith(expect.objectContaining({ amountCents: 3, smsUnits: 1, relatedId: 'task-1' }));
-    expect(billing.charge).toHaveBeenCalledWith(expect.objectContaining({ amountCents: 3, smsUnits: 1, relatedId: 'MSG-1' }));
+    expect(billing.release).toHaveBeenCalledWith(expect.objectContaining({ amountCents: 3, relatedId: 'task-1' }));
+    expect(billing.charge).toHaveBeenCalledWith(expect.objectContaining({ amountCents: 3, relatedId: 'MSG-1' }));
     expect(prisma.smsBillingRecord.create).toHaveBeenCalledWith({
       data: expect.objectContaining({ messageId: 'MSG-1', amountCents: 3, billingStatus: 'charged', transactionId: 'tx-charge' }),
     });
@@ -1412,12 +1414,39 @@ describe('SendChainService', () => {
     }));
     expect(prisma.operationLog.create).toHaveBeenCalledWith(expect.objectContaining({
       data: expect.objectContaining({
-        action: 'gateway.downstream_recovery_status_sync',
+        action: 'gateway.downstream_recovery_status_changed',
         resource: 'gateway_downstream_recovery_status',
       }),
     }));
   });
 
+  it('does not append recovery audit logs when only periodic timestamps change', async () => {
+    const { service, prisma } = createService();
+    prisma.gatewayDownstreamRecoveryStatus.findUnique.mockResolvedValue({
+      state: 'waiting_connection',
+      gatewayInstanceId: 'gateway-a',
+      lockOwner: 'gateway-a',
+      failureCategory: 'client_disconnected',
+      lastError: 'downstream client is not connected',
+      lastSkipReason: null,
+    });
+
+    await service.recordGatewayDownstreamRecoveryStatus({
+      account: '100001',
+      gatewayInstanceId: 'gateway-a',
+      state: 'waiting_connection',
+      lastAttemptAt: '2026-07-08T12:01:00.000Z',
+      nextRetryAt: '2026-07-08T12:11:00.000Z',
+      attemptCount: 3,
+      lockOwner: 'gateway-a',
+      lockExpiresAt: '2026-07-08T12:01:30.000Z',
+      lastError: 'downstream client is not connected',
+    });
+
+    expect(prisma.gatewayDownstreamRecoveryStatus.upsert).toHaveBeenCalled();
+    expect(prisma.operationLog.create).not.toHaveBeenCalled();
+  });
+
   it('marks downstream delivery as failed after reaching retry limit', async () => {
     const { service, prisma } = createService();
     const previous = process.env.CMPP_DOWNSTREAM_MAX_RETRIES;