save only changed, deleted, or added tasks.

[monomycelium]

Hey, I was also writing a TUI to-do app in Rust (but using tui-rs), but I was considering a more efficient way to save the tasks by saving only the lines that have been changed and not the unchanged ones. I tried making many implementations, like using enums or checking if the file contains that task already. However, I kept getting stuck. Do you have any idea how we could implement this?

[monomycelium]

Should we have an ID field for each task? Or maybe we could use rusqlite? Or csv? As long as it would reduce IO operations without compromising too much performance.