1.entity

public class SaledData implements Serializable {

    private static final long serialVersionUID = 1L;
    @TableId(value = "id", type = IdType.AUTO)
    private Long id;
    private LocalDate recordDate; // has unique index
    ...
}

2.fetch data from remote then save to mysql db

@Scheduled(cron = "0 0 1/1 * * ?") 
public void getSaledData() {
    @Resource private ISaledDataService iSaledDataService;
    SaledData saledData = new SaledData();
    ...
    iSaledDataService.save(saledData); 
    // sometimes has repeated data will intercept by unique index 
}

3.wrong id’s result

        "id": 158,
        "createTime": "2024-05-13T04:00:08",
        "recordDate": "2024-05-12"

        "id": 160,
        "createTime": "2024-05-12T20:00:12",
        "recordDate": "2024-05-11"

How does it happen? I am confused.