migrate method
Implementation
@override
Future<void> migrate(Migrator migrator, int fromVersion) async {
if (fromVersion < 2) {
await migrator.addField(
LogEntryDataBean, LogEntryDataBean.serviceName, ValueExpression(''));
}
if (fromVersion < 3) {
await migrator.addField(
InstanceDataBean,
InstanceDataBean.lastHeartbeat,
ValueExpression(DateTime.timestamp()),
);
}
}