def update_market_history_data(region_id, type_id):
    """Gets a types market data and store it in the datastore."""

    market      = crest_market.Market(crest_api.API())
    market_data = market.get_price_history(region_id, type_id)

    market_data['items'] = reversed(market_data['items'])

    for day in market_data['items']:
        entry_date     = datetime.strptime(day['date'], '%Y-%m-%dT%H:%M:%S').date()
        entry_date_str = '%s' % entry_date

        parent_key           = ndb.Key(m_misc.TypeModel, type_id)
        market_history_entry = m_market.MarketHistoryEntryModel.get_by_id(entry_date_str, parent_key)

        if market_history_entry is None:
            logging.info('Market history data for %s on %s does not exist. Adding.' % (type_id, entry_date_str))

            market_history_entry = m_market.MarketHistoryEntryModel(id=entry_date_str, parent=parent_key)

            market_history_entry.date          = entry_date
            market_history_entry.volume        = day['volume']
            market_history_entry.order_count   = day['orderCount']
            market_history_entry.price_average = day['avgPrice']
            market_history_entry.price_high    = day['highPrice']
            market_history_entry.price_low     = day['lowPrice']

            market_history_entry.put()