pub async fn applied_set(pool: &PgPool) -> Result<HashSet<String>, MigrateError>Expand description
Set of migration names already recorded in the default ledger
table (__rustango_migrations__). For a custom ledger, build a
Builder with .ledger("…") and call its applied_set method.
§Errors
Returns MigrateError::Driver for any sqlx failure (including a
missing ledger table — call ensure_ledger first).