The cross-midnight test read `push_attempts` for a synthetic `DEDUP`
channel. Separating the scheduler's bookkeeping from delivery diagnostics
moved the anchor to `notification_events`, and nothing has written that
channel since. The query matched no rows, `findMany` answered the empty
list, and the assertion compared an empty set it had no reason to expect —
a check that could not fail whatever the tick did.
It now reads `notification_events` by record and event type, and asserts
the single row's `dedupKey`. Removing the claim from the tick fails the
dispatch-count leg above it; narrowing the key so it no longer names the
slot fails this leg on the key's own content, which is what makes it a
check rather than a comment.
Marc-André Bombeck