Thanks. That's how dbt runs here: write-audit-publish on a dbt-audit branch, which merges to main only when the whole build passes, so Trino never sees a half-built table.

On maintenance, Nessie changes the picture a bit. Iceberg tables behind Nessie keep a single snapshot in their own metadata, because the history lives in Nessie's commit log. So expire_snapshots has nothing to do. Orphan and unreferenced files are handled by Nessie GC, which runs weekly with a 30-day cutoff (still in record-only mode while I build trust in it).

rewrite_data_files is the real gap, and you're right about the cause. Compaction isn't scheduled yet, and the table written every minute is the one piling up small files on Ceph. That's next on the list.