CLICKHOUSE_CLUSTER_EXTERNAL_ARTIFACT_UNSUPPORTED¶
External per-member staging requires one immutable replayable artifact with a SHA-256 digest, schema identity, byte size, and row count. The current artifact is one-shot, mutable, incomplete, over budget, or uses an unsupported canonical type profile.
Before candidate mutation, the owning runtime may perform exact cleanup and
record ABORTED. Produce a new bounded operation with a supported artifact;
do not materialize or replace data manually during recovery.