Earlier quoted context omitted.
I know many note-taking users like the concept of markdown and plain text. So do I. However, I think plain text has its limitations. There are many other types of structured data in life. Just like Word and Excel, they have different responsibilities. No one worries that Excel will not work in a few decades because it's just an offline software. Similarly, no one worries that SQLite will be unable to open or view bec…
SQLite won't stop working but your format is proprietary. A markdown can be understood even without rendering to HTML but your tables are useless for an user without your app.
As far as I can tell, the whole app is open source (AGPL), and sqlite is obviously open source as well. I agree that markdown is more portable, but this setup is far from proprietary.
I may not have made the same decision (I love having my notes in markdown), but I think OP was quite thoughtful about it and has made an informed and reasonable decision.