langgraph-persistence

To persist LangGraph state across conversations, configure a checkpointer backend like PostgresSaver or InMemorySaver and assign a thread_id to isolate and retain graph state for continuous, contextual interactions.

A thread_id in LangGraph persistence isolates individual conversations by scoping checkpoints and graph state to a specific thread, ensuring durable history replay and contextual continuity for each unique session.

Time travel in LangGraph works by loading previous checkpointed states saved by backends like SqliteSaver, allowing you to replay graph history and resume interactions from any historical point.

Yes, PostgresSaver is a supported checkpointer backend for storing LangGraph graph state, enabling production-grade persistence and durable state retention across multiple threads and sessions.

You manage long-term cross-thread memory in LangGraph by integrating the Store component, which retains shared facts and user preferences outside of individual thread-scoped checkpoints.

Yes, LangGraph persistence includes subgraph persistence modes, allowing you to save and restore isolated states of nested subgraphs alongside the parent graph's checkpointed history.