fix: paginate operational list pages

api/src/operations/operations.service.spec.ts

@@ -15,9 +15,10 @@ function createPrismaMock() {
     },
     smsMessageRecord: {
       findMany: jest.fn().mockResolvedValue([{ messageId: 'MSG-1' }]),
+      count: jest.fn().mockResolvedValue(51),
       groupBy: jest.fn().mockResolvedValue([{ status: 'delivered', _count: { _all: 2 }, _sum: { amountCents: 20, billingUnits: 2 } }]),
       aggregate: jest.fn().mockResolvedValue({ _count: { _all: 2 }, _sum: { amountCents: 20, billingUnits: 2 } }),
-    },
+  },
     smsReceiptRecord: {
       findMany: jest.fn().mockResolvedValue([]),
     },
@@ -254,6 +255,27 @@ describe('OperationsService', () => {
     }));
   });
 
+  it('paginates message records in PostgreSQL and limits heavy relations to the requested page', async () => {
+    const prisma = createPrismaMock();
+    const service = new OperationsService(prisma as never);
+
+    await expect(service.listMessagesPage({ tenantId: 'tenant-1', page: 2, pageSize: 25 })).resolves.toEqual({
+      items: [{ messageId: 'MSG-1' }],
+      total: 51,
+      page: 2,
+      pageSize: 25,
+    });
+    expect(prisma.smsMessageRecord.findMany).toHaveBeenCalledWith(expect.objectContaining({
+      where: expect.objectContaining({ tenantId: 'tenant-1' }),
+      skip: 25,
+      take: 25,
+      orderBy: [{ queuedAt: 'desc' }, { id: 'desc' }],
+    }));
+    expect(prisma.smsMessageRecord.count).toHaveBeenCalledWith({
+      where: expect.objectContaining({ tenantId: 'tenant-1' }),
+    });
+  });
+
   it('returns uplink messages with tenant and channel display data', async () => {
     const prisma = createPrismaMock();
     const service = new OperationsService(prisma as never);