checkpoint postgres: add a shallow checkpointer #2826
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vbarda
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libs/checkpoint-postgres/langgraph/checkpoint/postgres/shallow.py
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libs/checkpoint-postgres/langgraph/checkpoint/postgres/shallow.py
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This PR adds a "shallow" version of `PostgresSaver` checkpointer that ONLY stores the most recent checkpoint and does NOT retain any history. It is meant to be a light-weight drop-in replacement for the PostgresSaver that supports most of the LangGraph persistence functionality with the exception of time travel.
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This PR adds a "shallow" version of
PostgresSavercheckpointer that ONLY stores the most recent checkpoint and does NOT retain any history. It is meant to be a light-weight drop-in replacement for the PostgresSaver that supports most of the LangGraph persistence functionality with the exception of time travel.