loadMetadata method
Implementation
@override
Future<Metadata?> loadMetadata(String pubKey) async {
await dbRdy;
final event = await _loadLatestVisibleEvent(
pubKey: pubKey,
kind: Metadata.kKind,
);
if (event == null) return null;
final metadata = Metadata.fromEvent(event);
metadata.refreshedTimestamp = Nip01Event.secondsSinceEpoch();
return metadata;
}