What you’re seeing: one ASNSnapshot “truth row” per ASN (the current report card for that ASN).
Totals: long-term aggregates (all-time) from ASNTrafficTotal and ASNRiskTotal.
Rollup window: the ETL run window that produced this row (from ASNRollupRun, linked by etl_run_uuid).
ASNSnapshot contains rows for the latest completed ETL run.