检查点集成

与检查点后端集成，实现 LangGraph 的持久化存储。

检查点支持 LangGraph 的持久化功能，使智能体能够在多次交互间保存和恢复状态。

后端	包	源码
内存	langgraph-checkpoint	langchain-ai/langgraph
SQLite	langgraph-checkpoint-sqlite	langchain-ai/langgraph
PostgreSQL	langgraph-checkpoint-postgres	langchain-ai/langgraph
AWS (DynamoDB, Bedrock, Valkey)	langgraph-checkpoint-aws	langchain-ai/langchain-aws
MongoDB	langgraph-checkpoint-mongodb	langchain-ai/langchain-mongodb
Redis	langgraph-checkpoint-redis	redis-developer/langgraph-redis
Cockroach DB	langchain-cockroachdb	cockroachdb/langchain-cockroachdb
Aerospike	langgraph-checkpoint-aerospike	aerospike-community/aerospike-langgraph

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