持久化

from langgraph.checkpoint.memory import InMemorySaver
from langgraph.store.memory import InMemoryStore

checkpointer = InMemorySaver()
store = InMemoryStore()

graph = builder.compile(checkpointer=checkpointer, store=store)

result = graph.invoke(
    {"messages": [{"role": "user", "content": "你好，我叫 Bob。"}]},
    {"configurable": {"thread_id": "thread-1"}},
)

import uuid

config = {"configurable": {"thread_id": str(uuid.uuid4())[:255]}}

from langgraph.checkpoint.postgres import PostgresSaver

checkpointer = PostgresSaver.from_conn_string("postgresql://...")
checkpointer.setup()  # 创建带索引的表
# 考虑添加一个定时任务来删除早于 N 天的检查点