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Investigate DuplicateKeyError when graph interrupted and TTL is defined

Should fix langchain-ai/langgraph#6040, "E11000 duplicate key error collection : checkpoint_writes_aio index"

@spsingh559 Would you please confirm that this fixes your issue?

@caseyclements caseyclements marked this pull request as ready for review September 24, 2025 10:50
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LGTM!

@caseyclements caseyclements merged commit 0999e36 into langchain-ai:main Sep 24, 2025
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E11000 duplicate key error collection : checkpoint_writes_aio index

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