Struct Migration 

pub struct Migration {
    pub to: u32,
    pub what: &'static str,
    pub run: fn(&Store) -> Result<()>,
}

One step from a format to the next.

Fields

to: u32

The format it brings a brain to, from the one before.

what: &'static str

What it changes, as kb update reports it.

run: fn(&Store) -> Result<()>

Changes the brain’s files. It runs under the brain’s write lock, once: the format is written after it.