Yes definitely, adding database schemas and queries is on our roadmap for capturing "indirect links" across codebases. We are thinking of something similar to Supabase studio's schema visualizer [1], but integrated with the map of the codebase so that which parts of the code read/writes to different tables. Is that what you have in mind? Or do you mean something else by database access patterns?
This is great work! Mechanistic interpretability has tons of use cases, it's great to see open research in that field.
You mentioned you spent your own time and money on it, would you be willing to share how much you spent? It would help others who might be considering independent research.
1: https://supabase.com/blog/supabase-studio-3-0#schema-visuali...