Data engineering·Files, formats and table layers
you deleted the rows a month ago and the bytes were still in the bucket, because the old snapshots still referenced them.
Snapshot expiry
Also calledvacuum, snapshot retention, file cleanup
The maintenance operation that drops old table versions and physically removes the files only they referenced. Until it runs, deleted data is still on disk and still costs money, and it is still readable by anyone who can query an old snapshot. That makes it a privacy control as much as a cost control, and it is the step most often missing when a team implements erasure requests against a lakehouse.