fix(restore): skip restoration of additional entities included in DES…

…C SCHEMA WITH INTERNALS

As described in the comment.

Fixes #4050

pkg/service/restore/schema_worker.go

@@ -141,6 +141,13 @@ func (w *schemaWorker) restoreFromSchemaFile(ctx context.Context) error {
 
 	var createdKs []string
 	for _, row := range *w.describedSchema {
+		if row.Keyspace == "" {
+			// Scylla 6.3 added roles and service levels to the output of
+			// DESC SCHEMA WITH INTERNALS (https://github.com/scylladb/scylladb/pull/20168).
+			// Those entities do not live in any particular keyspace, so that's how we identify them.
+			// We are skipping them until we properly support their restoration.
+			continue
+		}
 		if row.Keyspace == "system_replicated_keys" {
 			// See https://github.com/scylladb/scylla-enterprise/issues/4168
 			continue