Best logging that I have seen

I love that Simple History can log failed login attempts and changes to posts. It is the best free logging that I have considered.

What I wish for is better knowledge of how the two tables (simple_history, and simple_history_context) are related, so that I can construct my own queries with these tables. I see more data in the tables than I get with either a JSON for CSV export. With that said, it is still the best logger that I have seen for WordPress.