V03 of the package DDL: the runs table's nullable outcome_blob column, and a GIN index on metadata.

outcome_blob

A run's own answer, kept where a reader that has never seen the run live can find it. A durable subchart child's completion used to exist only on the step that produced it - a stored record carries no donedata - which is fine while a completion is answered immediately and not fine once N of them have to be collected and assembled in index order. The column is written once, at the child's completion, by StatifierPersistence.Storage.update_run_status/4.

Nullable, because almost no run has one: an ordinary run answers nobody, and a run that fails at creation never completes.

It is a blob column, not a jsonb one, and the difference is a disclosure decision rather than a typing convenience. metadata is restricted to host identities (ADR-0006 decision 2) precisely because :blob_type encryption does not reach a queryable column. A donedata payload carries whatever the chart's author put in it, so it belongs on the side of that line the encryption reaches: outcome_blob joins the three existing blob columns and takes the configured :blob_type with them.

The metadata GIN index

V02 shipped no index and said why: which pairs a host queries by is the host's call (ADR-0006 decision 4). Fan-out settlement changes the arithmetic. Every child completion asks "are all N of my siblings terminal?", which is the same jsonb containment query the cascade already issues, so one fan-out of N children issues N of them; without an index each is a sequential scan of the host's whole runs table. That is not a cost a host can be left to discover in production, so this package now ships the index the query it issues needs.

jsonb_path_ops rather than the default jsonb_ops: containment (@>) is the only operator either query uses, and the path-ops opclass serves exactly that, with a smaller index. A host that needs the wider operator set, or an expression index on particular keys, still adds its own - ADR-0006 decision 4's clause is narrowed by this migration, not withdrawn, and the record carries a dated Note saying so.