An analytics job needs a "last 24 hours" filter. For deterministic grading, treat 2026-05-25 12:00:00 UTC as "now". events (event_id, user_id, event_type, event_ts) stores a UTC timestamp for each event.
Return the events from the last 24 hours: from 12:00 on 24 May, inclusive, up to and including "now". An event stamped after "now" comes from a clock error and must not count.