Announcing a new `langchain-postgres` integration package, implementing: Vectorstore based on pgvector Chat Message History Checkpoint Saver for LangGraph Vector store docs: https://
python.langchain.com/docs/integrati
ons/vectorstores/pgvector/
… Chat message history docs: https://
github.com/langchain-ai/l
angchain-postgres/?tab=readme-ov-file#chatmessagehistory
… Checkpoint

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