Widen the SQL query to consider all statuses (queued, running,
succeeded, failed, cancelled) rather than terminal-only. An in-flight
prune that outlasts the 60s tick interval previously produced
ErrNotFound, causing the ticker to anchor at now-24h and fire a second
prune concurrently with the first.
Update the doc comment and test: remove the "queued job filtered out"
case, add assertions that a running job and a queued job are each
returned as the latest.
steve