Snapshots shouldn't include data outside its specified duration
As in !157 (merged), snapshot filenames are of the form <ifos>_SEGMENTS_<last_snapshot_time>_<duration>
, but they include data from last_snapshot_time + duration
to last_snapshot_time + duration + 1
. The next snapshot for SEGMENTS will have overlapping data for that timestamp.
It's a very minor off by one. Could be fixed with some simple rearranging of when we run snapshots, though note if we put it before clustering it could potentially delay a gracedb upload.