Finding ·
Head deletion needs an anchor outside the store (LangGraph #9099)
Binding a record to its place (#9004) cannot see a record that has been removed, so deleting the newest checkpoints still rolls a thread back silently. A community reference implementation lets the caller pass the id of the head it trusts; with it set, head deletion raises on both the sync and async checkpointers, and merged with the #9004 fix the rollback-by-overwrite case is rejected as well. Measured with the suite on both paths; the history view is not covered by the anchor and that is on record.