Don't forget voice notes. And, eventually, taking a picture or two as a way to better define a note.
So, something like title/subject, date, text, audio and pictures. The three forms of notes could coexist under a single title/object or be three different kind of notes.
Ok, this is how to make a simple project a nightmare

A boring Sunday simple job transformed in a relatively complex and long lasting experience...the good part is that there's a lot to learn from it.