The download counter was read-modify-written, so two concurrent retrievals
recorded one. It is an audit trail — under-reporting is the failure mode it
must not have.
The creation-race test broke when issuing moved into a transaction: its
simulated competitor writes inside our transaction, so the rollback removes
that row too. It now asserts what actually matters (the loser is told, and
creates nothing) and states what a single-connection sqlite test cannot show.
This test was red in the previous commit — my mistake for committing before
reading the run.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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