Macro migration 

macro_rules! migration {
    (
        $type:ident,
        $name:literal,
        up: |$up_schema:ident| $up:block,
        down: |$down_schema:ident| $down:block $(,)?
    ) => { ... };
}

Define a migration without writing the pinned-future boilerplate.

migration!(
    CreateUsersTable,
    "2026_08_29_000001_create_users_table",
    up: |schema| {
        schema.create("users", |t| { t.id(); t.string("name"); }).await
    },
    down: |schema| { schema.drop("users").await },
);

The bodies are blocks rather than closures on purpose: a closure returning a future that borrows its argument cannot express the lifetime that relationship needs, and the error it produces is unreadable.