GS_TXN_SNAPSHOTGS_TXN_SNAPSHOT is a timestamp-CSN mapping table. It periodically samples and maintains an appropriate time range to estimate the CSN value corresponding to the timestamp in the range.Table 1 GS_TXN_SNAPSHOT columnsNameData TypeDescriptionsnptimetimestamptzSnapshot timesnpxminbigintMinimum transaction ID snapshotssnpcsnbigintCommit sequence number (CSN) snapshotssnpsnapshotTEXTSerialized snapshot text