def update(hash)
      shash = {}
      hash.each do |key, value|
        shash[@serializer.key_for(key)] = value
      end
      @journal << shash
      @table.update(shash)
      self
    end
def update(hash)
      shash = {}
      hash.each do |key, value|
        shash[@serializer.key_for(key)] = value
      end
      @journal << shash
      @table.update(shash)
      self
    end
Update database with hash (Fast batch update)
 @param [Hash] hash the key/value hash
 @return [DB] self