The market_api sources were configured with endpoint='prev_bars' which
only fetches a single previous-day bar per ticker. Changed to
'intraday_bars' which fetches hourly bars for today from Polygon's
/v2/aggs/ticker/{ticker}/range/1/hour/{today}/{today} endpoint.
Updated: seed script, beta DB (50 sources), production DB (50 sources).
This gives ~7-8 hourly price bars per trading day per ticker instead
of 1 daily bar.
Celes Renata
2538da3f1e