Where to describe: database on the same server (empty: the URL's own database) after running
setup inside the transaction. built names a database this call created, so the caller can
let go of connections to older ones and then prune_schema_databases.
Fields
- database: string
- setup: string
- setup_marks: [] Setup_Mark
- built: bool
- failed: bool
- A migration failed while building the database for the whole set.
databaseis then the schema before it (empty when no migration comes before it): answers from it are stale. - failure: Migration_Failure