Require email at registration (editable on profile), add a Resend mailer with idempotent first-answer sends, and keep answer saves independent of delivery.
Hold a session advisory lock for the full migration apply path, and remove Chi RealIP so clientIP can validate the TCP peer before walking X-Forwarded-For.
Evict/cap limiter keys, replace hard username lockouts with IP+user progressive delays cleared on success, and create bootstrap admins under the same advisory/mutex lock as role changes.
Replace username-based admin bootstrap with a one-time setup secret, rate-limit login/register, equalize login bcrypt timing, cap passwords at 72 bytes, destroy sessions on logout, and require Secure cookies when PORT is set.
Introduce a Store interface with Postgres and in-memory backends, cover mutations/CSRF/session rotation without Postgres, bound avatar decode dimensions, add truncate/prepareAvatar unit tests, and run go test -race in CI.
codegirl007