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## What Problem This Solves `test_usage_metrics_lock_has_single_owner_and_releases_on_drop` hardcodes the **production** advisory lock key (`0x4255_5A5A_4D45_5452`) on the shared `TEST_DATABASE_URL`. Postgres advisory locks are per-database, so any live `buzz-relay` pointed at the same DB holds that key and the test fails (or races the relay tick). Diagnosis time was burned during #3268 verification, including near-misses on live dev relays. Fixes #3619. ## Why This Change Was Made Preferred fix from the issue: run the test on a private scratch DB via existing `create_scratch_db` / `drop_scratch_db` (same pattern as replica-routing fixtures). Keep the production lock key so the test still documents the real constant, without colliding with a running relay. ## User Impact - Local `cargo test -p buzz-db -- --ignored` no longer fails when a dev relay is running against the shared test DB - Safer: no temptation to `pg_terminate_backend` a live relay to "fix" the test ## Evidence - Code review of fixture isolation - Pattern matches existing `create_scratch_db` usage in this file - Test remains `#[ignore = "requires Postgres"]` (same as before) ## Related - Issue: #3619 - None found among open PRs for this exact fix Signed-off-by: NanoRisk6 <aidashtherapy@gmail.com>