Matt 27f8db4c67 fix(P1): rate-limit auth endpoints — F7
Pre-audit: 20 rapid wrong-password attempts all returned 401 with no
lockout. Brute-force open.

Post-fix: better-auth's built-in rate limiter caps /sign-in/email at
5 attempts per 60s. Verified live — attempts 1-5 return 401, attempt 6+
returns 429 "Too many requests".

Same tight cap applied to /sign-up/email, /forget-password,
/reset-password. Default 120/min for everything else so legitimate
multi-widget dashboards aren't hampered.

Memory storage in this commit (resets on restart). Production multi-replica
swap to `storage: 'database'` planned for a follow-up once the
rateLimit migration is run.

Also: in production, trust X-Forwarded-For / X-Real-IP so the IP that
rate-limit + audit logging see is the real client, not the proxy.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-14 22:41:47 +02:00
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