loadEventSources method
Implementation
@override
Future<List<String>> loadEventSources(String eventId) async {
final records = await _eventSourceStore.find(
_database,
finder: sembast.Finder(filter: sembast.Filter.equals('eventId', eventId)),
);
final sources =
records.map((record) => record.value['relayUrl'] as String).toList()
..sort();
return sources;
}