use crate::MigrationContext;
pub trait MigrateFrom<TOld>: Sized {
const RENAMES: &'static [(&'static str, &'static str)] = &[];
const CONVERTS: &'static [(&'static str, u64, u64)] = &[];
fn migrate(old: TOld, ctx: &mut MigrationContext) -> crate::Result<Self>;
}