Delta Dv Replacement Precondition
Check the two named atomic logical-file replacement preconditions before a data writer proposes a new deletion-vector identity for an existing physical file. Checks only per-path action multiplicity and exact prior-DV retirement; observed is not full Delta commit validity. Pseudonym metadata only,no file access or changes. Schema-valid unknown is successful at the same fixed price;invalid input requires native400 before settlement.
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