External price data sources

Allow users to provide an external data source to fetch historical prices and optionally current prices, splits and dividends.

This enables automated price tracking for assets that Capitally does not support and probably never will.

User should be able to use an existing API endpoint like AlphaVantage, or anything else that can be fetched and parsed by the browser.

:construction: It’s worth noting, that due to the security limitations, the API has to allow other sites to fetch data from it. Most legit data providers allow for that, but if you want to scrape a website, or use Yahoo Finance API - then it’s not possible. At least not directly.

As data formats are wildly different, it should allow for formulas, simple JavaScript or logic similar to Tax presets or Imports to extract data from the data source.