last_verified_at
The date we last confirmed this record against its source.
last_verified_at is the date a human or a crawl last checked this record
against the page it came from and found them to agree.
It is per-record rather than site-wide, and that is the whole point. "We update daily" is a claim about a process; a date on a row is a claim about that row. The first is what every listing service publishes and the second is what a reader actually needs.
A record whose source was amended after this date is a record describing a page that has changed. Alerts report changes on records you follow, which is the case an amendment creates.
Shown as: the verification stamp on every record, in mono with tabular figures. When absent: never. See also last verified and amendment.