fix: clarify client amounts and log date filters

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

@@ -890,6 +890,22 @@ describe('OperationsService', () => {
     });
   });
 
+  it('applies an explicit Beijing date interval to operation logs', async () => {
+    const prisma = createPrismaMock();
+    const service = new OperationsService(prisma as never);
+
+    await service.systemLogs({ createdAtFrom: '2026-08-21', createdAtTo: '2026-08-27' });
+
+    expect(prisma.operationLog.findMany).toHaveBeenCalledWith(expect.objectContaining({
+      where: expect.objectContaining({
+        createdAt: {
+          gte: new Date('2026-08-20T16:00:00.000Z'),
+          lte: new Date('2026-08-27T15:59:59.999Z'),
+        },
+      }),
+    }));
+  });
+
   it('exports filtered operation logs with a traceable operation id', async () => {
     const prisma = createPrismaMock();
     const service = new OperationsService(prisma as never);