- CI-C1 false positive: actions/{checkout,setup-node,upload-artifact}
@v6 do exist (v6.0.0 releases published Oct-Dec 2025). Restore the
@v6 refs — the earlier batch-1 commit downgraded them unnecessarily.
- Widen idempotency_keys primary key to (key, user_id, method, path)
via new migration. Batch 1 widened the middleware lookup but left
the table PK at (key, user_id), so `INSERT OR IGNORE` silently
skipped the second endpoint that reused a key — the cache was
never populated for it and a replay re-ran the handler. The
migration rebuilds the table preserving existing rows (the old
narrower PK guarantees no conflicts against the new looser key).
- HSTS: keep `includeSubDomains` OFF by default. Enabling it for
every NODE_ENV=production install would break apex-domain setups
where siblings still serve HTTP. Operators who want the stricter
policy opt in with HSTS_INCLUDE_SUBDOMAINS=true.
- Extend the idempotency unit tests to cover the (method, path)
dimension — same user+key on different path no longer replays.
Maurice