fix: simplify balance billing and govern operation logs

api/src/sms-config/sms-config.service.spec.ts

@@ -437,6 +437,36 @@ describe('SmsConfigService', () => {
     });
   });
 
+  it.each([
+    ['heartbeat', 'lastHeartbeatAt'],
+    ['submit', 'lastSubmitAt'],
+    ['deliver', 'lastDeliverAt'],
+  ] as const)('updates downstream %s state without appending high-frequency operation logs', async (status, timestampField) => {
+    const prisma = createPrismaMock();
+    prisma.cmppDownstreamConnection.findUnique.mockResolvedValue({
+      id: 'downstream-1',
+      connectedAt: new Date('2026-07-11T11:00:00.000Z'),
+      lastHeartbeatAt: new Date('2026-07-11T11:00:00.000Z'),
+      lastSubmitAt: null,
+      lastDeliverAt: null,
+      lastError: null,
+    });
+    const service = new SmsConfigService(prisma as never);
+
+    await service.recordDownstreamConnectionEvent({
+      account: '100001',
+      connectionId: 'gateway-1-1',
+      status,
+      observedAt: '2026-07-11T11:00:30.000Z',
+    });
+
+    expect(prisma.cmppDownstreamConnection.update).toHaveBeenCalledWith(expect.objectContaining({
+      where: { id: 'downstream-1' },
+      data: expect.objectContaining({ [timestampField]: new Date('2026-07-11T11:00:30.000Z') }),
+    }));
+    expect(prisma.operationLog.create).not.toHaveBeenCalled();
+  });
+
   it('lists enterprise signatures with keyword filters and real relations', async () => {
     const prisma = createPrismaMock();
     const service = new SmsConfigService(prisma as never);

api/src/sms-config/sms-config.service.ts

@@ -593,13 +593,15 @@ export class SmsConfigService {
     const connection = existing
       ? await this.prisma.cmppDownstreamConnection.update({ where: { id: existing.id }, data: payload })
       : await this.prisma.cmppDownstreamConnection.create({ data: { connectionId: data.connectionId, ...payload } });
-    await this.writeOperationLog(application.tenantId, undefined, `cmpp_downstream_connection.${data.status}`, 'cmpp_downstream_connection', data.connectionId, {
-      applicationId: application.id,
-      account: data.account,
-      remoteIp: data.remoteIp,
-      protocol: data.protocol,
-      status: connection.status,
-    });
+    if (data.status === 'connected' || data.status === 'disconnected') {
+      await this.writeOperationLog(application.tenantId, undefined, `cmpp_downstream_connection.${data.status}`, 'cmpp_downstream_connection', data.connectionId, {
+        applicationId: application.id,
+        account: data.account,
+        remoteIp: data.remoteIp,
+        protocol: data.protocol,
+        status: connection.status,
+      });
+    }
     return connection;
   }