Python: break get_latest timestamp ties with the checkpoint lineage chain - #8514
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…ming and post-stream parsing Define is_pydantic_response_format once and reuse it to drive both skip_text and post-stream structured output recovery, preventing the two paths from drifting.
…hain Identical timestamps at a superstep boundary made max() pick whichever checkpoint the storage iterated first, so get_latest could return a stale checkpoint depending on save order. Both storages now first drop every checkpoint that another one supersedes via previous_checkpoint_id and only then compare timestamps. Signed-off-by: Manohar Paturi <186662190+ManoharPaturi@users.noreply.github.com>
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Fixes #8513.
Both
get_latestimplementations first drop every checkpoint that another one supersedes viaprevious_checkpoint_id(the ordering theWorkflowCheckpointdocstring already defines), then compare timestamps among the remaining tips. Unrelated chains and storages without lineage metadata fall back to the previous behavior.Regression test saves a parent/child pair with identical timestamps in both orders and asserts the child always wins; it fails on main. Checkpoint suite green.