Hey everyone, it's your resident 38-year-old 'oji' here, tinkering with AI agents and automated trading bots in the evenings and on weekends.
Today, I want to share a story about a quiet, unassuming bug in my self-built investment screener. It's a classic case where not a single line of code was wrong, yet the overall system continued to behave in an unintended way.
The Discovery: A Hunch About the 'Exclusion List'
I run a personal automated stock screener. It pulls data for all listed stocks, filters them based on my custom criteria, and narrows down potential candidates for monitoring. Pretty standard stuff.
Within this script, there was a static list of specific stock tickers to be mechanically excluded. For example, companies whose industry doesn't align with my strategy, or ones I'd previously researched and decided weren't a good fit.
