- Remove duplicated app_allows_user_cached?/headers_for_user_cached methods; call model methods directly
- Fix sliding-window rate limit bug by using increment instead of write (avoids TTL reset)
- Use cached app lookup in validate_redirect_url instead of hitting DB on every unauthorized request
- Add cache busting to ApplicationGroup so group assignment changes invalidate the cache
- Eager-load user groups (includes(user: :groups)) to eliminate N+1 queries
- Replace pluck(:name) with map(&:name) to use already-loaded associations
- Remove hardcoded fallback domain, dead methods, and unnecessary comments
- Fix test indentation and make group-order assertions deterministic
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
