LangGraph Checkpointing and Time Travel Debugging (EXPLAINED)
TL;DR — Quick Answer
Checkpoints save graph state after each superstep to a persistence backend (memory, SQLite, Postgres). Time travel reloads prior checkpoint to replay, fork, or fix bad routing — essential for long workflows and human interrupts.
The Interview Question
How does checkpointing work in LangGraph? Explain persistence backends and how 'time travel' helps debug agent failures.
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LangGraphCheckpointingTime TravelDebuggingLangChainStartups