method
Store.ReadyWithMigrationHistory
func (backend *Store) ReadyWithMigrationHistory(
ctx context.Context,
manifest schema.Manifest,
expectedHistoryDigest string,
) errorProve exact executable history, manifest, completed step state, and managed-index readiness.
Source adapters/mongodb/migration_runner.go:663
It compares every ordered ledger filename and artifact digest with the ridu build fingerprint, verifies indexes without mutation, then rereads the ledger to reject a concurrent change.