Cloud Run appends the connecting peer to x-forwarded-for; the limiter read
the left-most value, which the caller controls, so a forged first hop earned
a fresh bucket per request.
- Quota reservation takes a per-host advisory lock; READ COMMITTED admitted
a whole burst past the cap (80/80 without, 60/80 with, against Postgres 16).
- Challenge issuance no longer writes push_hosts; the row lands on proof
verification. Stale hosts prune after 30 days. Per-IP token bucket on the
two unauthenticated routes.
- Streaming body limit via hono bodyLimit; a chunked body bypassed the
Content-Length check.
- registrationIds deduped in the schema; per-host device cap of 64; list
bounded to its schema.
- Gateway-side challenge TTL is the specified 10 s, not 40 s.
- APNs stream settles on close as well as end/error.
Jinwoo-H