If you're looking to get wrapped around the wheel on a Monday (🤣 ), look at schema.org's example data structures for thing like https://schema.org/Person and think about how to structure your

people.md

notes! The more thought I put into systematic organizing my thoughts and measuring different metrics of my life (Quantified Self, etc), the need for a database with an elaborate schema AND a custom app for input/out is inescapable.