Refactor: Update mocks in test files for improved structure and clarity

src/services/db/flyer.db.test.ts

@@ -458,8 +458,8 @@ describe('Flyer DB Service', () => {
 
       await flyerRepo.deleteFlyer(42, mockLogger);
 
-      expect(withTransaction).toHaveBeenCalledTimes(1);
       expect(mockClientQuery).toHaveBeenCalledWith('DELETE FROM public.flyers WHERE flyer_id = $1', [42]);
+      expect(withTransaction).toHaveBeenCalledTimes(1);
     });
 
     it('should throw an error if the flyer to delete is not found', async () => {