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app/rate_limit.py: an in-process sliding-window limiter (single-worker backend, so no Redis needed -- flagged for if that changes). /register and /login are capped at 10 attempts / minute / client IP (X-Forwarded-For aware), returning 429 + Retry-After past that. Blunts credential brute-force, which the backend had no protection against. - conftest.py resets the limiter between tests (every TestClient request looks like one IP). - tests/test_rate_limit.py: threshold, shared bucket, per-key window. 77 passed. CORS reviewed while here: already an explicit origin allowlist (settings.CORS_ORIGINS), not "*" -- and the Godot client isn't a browser so it doesn't apply there anyway. Left as-is. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015jtxAiu5dAW4WxCNdGkrkJ