Feat/chat routing chain rewrite#6
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sylvanding merged 6 commits intomainfrom Mar 12, 2026
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… rewrite Comprehensive planning documents for migrating chat message routing from custom SSE + monolithic _stream_chat to Vercel AI SDK 5.0 Data Stream Protocol + LangGraph StateGraph pipeline. Made-with: Cursor
Backend: LangGraph StateGraph with 6 nodes (understand, retrieve, rank, clean, generate, persist) emitting Data Stream Protocol events via get_stream_writer(). New /stream/v2 endpoint runs alongside existing /stream for gradual migration. Frontend: Vercel AI SDK 5.0 useChat hook with custom transport, OmeletteUIMessage types, useChatStream wrapper, and MessageBubbleV2 component rendering UIMessage.parts. PlaygroundPage rewritten to eliminate manual SSE parsing and 15+ useState/useRef. Made-with: Cursor
…dd pipeline tests - Remove legacy _stream_chat and helpers (TOOL_MODE_PROMPTS, _clean_excerpt, etc.) - Promote /stream/v2 to /stream as the sole chat endpoint - Initialize LLM/RAG services at endpoint layer for proper config sharing - Remove streamChat from frontend chat-api.ts (replaced by AI SDK transport) - Update transport URL from /stream/v2 to /stream - Add 23 tests: stream_writer formatting, ChatState types, graph compilation, config helpers, and 3 endpoint integration tests - Simplify test_chat.py to only cover Conversation CRUD Made-with: Cursor
Prevents React duplicate key warning when multiple thinking steps share the same step name (e.g. two "understand" events). Made-with: Cursor
Made-with: Cursor
Documents the full chat message routing chain rewrite: problem symptoms, root cause, LangGraph + AI SDK 5.0 solution architecture, 5 implementation pitfalls encountered, and prevention strategies. Made-with: Cursor
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