SNAPSHOT.SNAPSHOTSNAPSHOT records the index information, start time, and end time of WDR snapshots stored in the current system.The results can only be queried in the system library, but not in the user library.Table 1 SNAPSHOT attributesNameTypeDescriptionExamplesnapshot_idbigintWDR snapshot ID1start_tstimestampStart time of a WDR snapshot2019-12-28 17:11:27.423742+08end_tstimestampEnd time of a WDR snapshot2019-12-28 17:11:43.67726+08