The frontend proxy fix alone was incomplete. Backend slowapi used the default
get_remote_address (request.client.host), which is the proxy's IP because
uvicorn runs without --proxy-headers — so the relayed x-forwarded-for was
ignored and all users still shared one rate-limit bucket.
- Add app/ratelimit.py: shared `limiter` + `client_ip_key` that reads
x-forwarded-for[0] → x-real-ip → peer. Replaces the three independent
Limiter(get_remote_address) instances in main.py / posts.py / prices.py
(which also had separate, non-shared storage).
- Register SlowAPIMiddleware so default_limits ("60/minute") applies to EVERY
route. Previously only the 2 decorated read endpoints were limited; all
signed-mutation routes had no rate limit at all (the "20/min per-route"
comment was aspirational — no such decorator existed).
- Add tests/test_ratelimit.py (7 tests): XFF precedence, fallbacks, two users
behind one proxy get distinct keys, middleware-registered guard.
72 tests pass.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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