getSyncPoint method
Implementation
@override
Future<DateTime?> getSyncPoint(SyncScope scope) async {
final sk = _scopeKey(scope);
final q = db.select(db.syncPoints)
..where((t) => t.scopeName.equals(scope.name) & t.scopeKeys.equals(sk));
final row = await q.getSingleOrNull();
return row == null ? null : DateTime.parse(row.lastServerTs).toUtc();
}