v2.0.0 - Complete rewrite with Next.js and Vercel AI SDK

🎉 v2.0.0 - Complete Rewrite

Complete architectural overhaul from LangChain/Express to Next.js with Vercel AI SDK.

⚠️ Breaking Changes

This is NOT backward compatible with v1.x

• Complete rewrite - new codebase
• New database schema required (PostgreSQL with Drizzle ORM)
• New authentication flow (NextAuth)
• New API structure (Next.js App Router)

Major Changes

Architecture

• ✅ Migrated from LangChain/Express to Next.js App Router
• ✅ Replaced LangChain with Vercel AI SDK
• ✅ Migrated from file-based sessions to PostgreSQL with Drizzle ORM
• ✅ Added NextAuth for authentication

AI Providers

• ✅ Multi-provider support (Google Gemini, Anthropic Claude)
• ✅ Reasoning/thinking modes for both providers
• ✅ Speed vs Enhanced Reasoning model selection

Features

• ✅ Complete UI redesign with shadcn/ui components
• ✅ Chat history and persistence
• ✅ User management and authentication
• ✅ Settings management with encrypted API keys
• ✅ Title and summary generation for chats

License

• ✅ New Sustainable Use License with Unstacked Apps, LLC ownership

Migration Notes

Users upgrading from v1.x will need to:

1. Set up new database (PostgreSQL)
2. Run migrations (pnpm db:migrate)
3. Re-authenticate with NetSuite
4. Re-configure AI provider settings

Full Changelog

See CHANGELOG.md for complete details.