V02 of the package DDL: the nullable metadata jsonb column on the runs table (ADR-0006 decision 3, decision 4's migration shape).

Nullable, because a run created with no metadata stores none, and ADR-0006 decision 3 makes the empty map the never-refused default - a NOT NULL column would turn "no metadata" into a write this package would have to invent a value for.

No index. Which key/value pairs a host queries by, and therefore which expression or GIN index it wants, is the host's call and not something this package can guess (ADR-0006 decision 4). A host that queries the column at any volume adds its own index in its own migration; StatifierPersistence.Storage.Ecto.list_runs_by_metadata/2 issues a jsonb containment query a GIN index on the column serves directly.

:blob_type does not reach this column and never will: it is a queryable column, not a blob, which is exactly why ADR-0006 decision 2 admits host identities into it and nothing else.