X_QUERY_ETAG_INVALID
Means
etag: true on a read that has its own validator
Typical cause
query({ etag: true }) on a download read or a live read — a download answers its own ETag, and a live read is revalidated by its cursor
Fix
query({ input, policy, sql }) # the declaration the cause names, with etag: true removed; a live read's cursor is its validator