public override IEnumerable<KeyValuePair<long, Tick>> Read()
        {
            Cursor cursor = new Cursor(database);

            try
            {
                foreach (var item in cursor.Forward())
                    yield return new KeyValuePair<long, Tick>(Reverse(item.Key), ToTick(item.Value));
            }
            finally
            {
                cursor.Close();
            }
        }