* A single entry in the data journal. We do not store {@code persistenceId} for each entry, as that is a
* journal-invariant, nor do we store {@code sequenceNr}, as that information is maintained by {@link JournalSegment}'s
* index.
- *
- * @author Robert Varga
*/
-abstract class DataJournalEntry {
+abstract sealed class DataJournalEntry {
/**
* A single data journal entry on its way to the backing file.
*/