Alpha Vantage

The Alpha Vantage documentation describes daily adjusted data containing raw OHLCV, an adjusted close and split/dividend information. Those fields should not be silently treated as one uniformly adjusted price series.

For the Alpha Vantage integration, choose a documented corporate-action date and inspect the fields around it. Label raw and adjusted values explicitly in storage and charts. This is a data-interpretation check, not a recommendation to trade on a particular series.