Hi,
I encountered missing prices in usstock-1d database on Sep 08 2020:
get_prices('usstock-1d', sids=get_securities(symbols=['VTI', 'SPY', 'GLD'], fields=['Sid']).index.tolist(), fields=['Close'], start_date = '2020-09-03', end_date = '2020-09-10').loc['Close']
Database recreation didn't help