Add ui_chat_log column to checkpoints

Alper Akgunrequested to merge
571913-add-ui_chat_log-column-to-checkpoints into master

What does this MR do and why?

Add ui_chat_log column to checkpoints

Currently checkpoint column contains the ui_chat_log but it will move to a separate column for performance, storage and isolation purposes. Checkpoint is used by langgraph internally and ui_chat_log will be used in UI.

  • Model/API changes are a bit complicated and will come in another MR.
  • We don't need an immediate index here - we shall need due to json access during the graphql API implementation

Changelog: added

References

Related to #571913 (closed)

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Edited by Alper Akgun

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