Add checkpoint time to debug info

[d4n-a]

Hey team,

I am currently developing an AI Agent system. I want my application to use the time the checkpoint was created as a part of business logic.

A field ts of a class Checkpoint contains information about the creation time of the checkpoint.

However, this field is inaccessible, when I'm querying the graph.

I would expect this field to be a part of the debug information when I run:

agent_graph.astream({}, config, stream_mode="debug")

This could be done in the method astream within class Pregel, by calling map_debug_checkpoint with extra argument checkpoint.ts.

I can make a pull request about it. Please let me know what you think

[CostcoFanboy]

We are building an Agentic system as well and are having a hard time modifying the serialization tools to add consistent timestamps to the checkpoint and messages and are running into similar issues.

[nfcampos]

Hi, the timestamp is available on the timestamp property of the debug/checkpoint event.