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LangChain Forum - Latest posts

Prompt_cache_retention: '24h' supported in langchain agents and where to provide it, inside invoke or while creating client? Could RAG pipelines realistically cause deployment timeouts, is Render suitable for first-time RAG deployments? How do I use langchain_postgres' init_vectorstore_table correctly? Proposal: Graph-wide default error handler for StateGraph (fallback for nodes without error_handler) Support timedelta for CachePolicy.ttl, consistent with TimeoutPolicy Question about LangSmith Trace Search via API How to cancel a run correct !! Anyone confirms this issue that deepagent ui streaming is disturb by update in deepagent or bug issue Would pre-inference routing help long-context agent workflows? Best Stack for Building AI Applications Question about LangSmith Trace Search Seeking help regarding the connection between Websocket and tool calls Tool invocation error with empty error message when using `InjectedState` + `Command` return in async tool How to use @langchain/react FileSystem middleware Using ChatSnowflake with agents Built llmsessioncontract on AgentMiddleware: runtime enforcement of tool-call protocols — feedback wanted DeltaChannelHistory not found in langgraph-api:3.12 Improving citation accuracy and reducing hallucinations in custom Parent-Child RAG pipeline (Gemma3:4B + FAISS+BM25 + Cross-encoder reranker) Metadata filter not filtering for alerts Connecting the Slack integration fails with invalid_team_for_non_distributed_app Trouble understanding and editing experiment summary evaluators feedbacks SSL certificate error from httpx with LangGraph server WikipediaLoader endup in JSONDecodeError Human-in-the-loop approval dashboard for LangGraph agents — open source, free to deploy Should interrupt() be split into two primitives — one for human input, one for s2s data fetching? How are people handling data governance across agent handoffs in production? Feature Request: @task metadata Research: Friction Points in Agentic Commerce Transactions How should I provide an agent to a LangGraph server?
LangGraph + PostgreSQL: Chat history and summarization be...
prakash · 2026-04-20 · via LangChain Forum - Latest posts

Hi everyone, I am building a chatbot using LangGraph with PostgreSQL as the checkpointer and storage layer. Current setup: Using LangGraph agent with tools and memory PostgreSQL to store chat history (messages table) UI displays chat conversations similar to ChatGPT Problem: I am facing confusion around handling long conversations and summarization. My requirements: UI should display the full chat history (like ChatGPT sidebar/chat window) For LLM context, I want to send: summarized ol...