— Find the AWR snapshot details.
select snap_id,begin_interval_time,end_interval_time from sys.wrm$_snapshot order by snap_id

— Purge snapshot between snapid 439 to 800
execute dbms_workload_repository.drop_snapshot_range(low_snap_id =>439 , high_snap_id =>800);

— Verify again
select snap_id,begin_interval_time,end_interval_time from sys.wrm$_snapshot order by snap_id’

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