Macro migration 

macro_rules! migration {
    (
        $struct_name:ident,
        $name:expr,
        up = $up:expr,
        down = $down:expr $(,)?
    ) => { ... };
}

Closure-style migration — Laravel’s Schema::create('posts', function (Blueprint $t) { ... }) ported to Rust.

Expands to a unit struct + Migration impl + inventory::submit! — the same machinery #[derive(Migration)] produces, just spelled in six lines instead of twenty.

Usage:

use anvilforge::prelude::*;

migration!(CreatePostsTable, "2026_05_20_create_posts_table",
    up = |s| {
        s.create("posts", |t| {
            t.id();
            t.string("title").not_null();
            t.text("body").not_null();
            t.timestamps();
        });
    },
    down = |s| {
        s.drop_if_exists("posts");
    },
);

The struct name is explicit (mirrors Laravel’s class name) so the inventory registration stays deterministic and rollback diagnostics can name the migration in panics/errors.