markerTtlSeconds

How long the marker column (and so the whole husk row) survives past the data columns' own ttlSeconds. Must be strictly greater than ttlSeconds — if left at the default null, resolves to ttlSeconds + gcGraceSeconds of the entity's own @ScyllaTable (Cassandra/Scylla's real default of 864000s/10 days when gcGraceSeconds is left at its own sentinel default of -1).