Investigate signup and auth flow - no issues found

[Copilot]

Comprehensive security audit of the signup and authentication flow covering Better Auth, Hono, tRPC, and Tanstack Router integration.

Findings

No issues found. All previously identified security vulnerabilities have been addressed:

• Email verification bypass vulnerability fixed
• Email sending race condition fixed (uses waitUntil for Cloudflare Workers)
• Legacy users table sync removed
• Security audit logging implemented for all auth operations
• Password complexity requirements (OWASP-compliant)
• Disposable email blocking and typo detection
• Token cleanup cron job added

Security Measures Verified

• Password validation: 8+ chars, uppercase, lowercase, number, special char
• Session management: HTTP-only cookies, 15-min cache, 7-day expiry
• Rate limiting: API and verification email resends
• Audit logging: All auth events logged to securityAuditLog
• Sentry integration: Error tracking throughout auth flow

Test Results

• 219 tests pass
• Type checking clean
• Build succeeds

Architecture

Client                          Server
──────                          ──────
Tanstack Router (guards) ──────► Hono (middleware)
     │                               │
     ├── auth-client.ts              ├── better-auth.ts (config)
     ├── useAuth.ts (hooks)          ├── auth.ts (tRPC router)
     └── register.tsx, etc.          └── security.ts (audit logging)

No code changes required.

Original prompt

investigate the sign up and auth flow for Tuvix. Check the interactions with Hono, Better Auth, Tanstack Router, and the rest of the app. Look for issues, errors, or areas of improvement.

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