Macro define_domain_errors 

macro_rules! define_domain_errors {
    (
        domain: $domain:literal,
        prefix: $prefix:expr,
        errors: {
            $( $variant:ident => ($index:expr, $status:expr, $display:literal) ),* $(,)?
        }
    ) => { ... };
}

Macro to define domain-specific error codes with minimal boilerplate.

Example

use cqrs_rust_lib::define_domain_errors;
use http::StatusCode;

define_domain_errors! {
    domain: "tenant",
    prefix: 4,
    errors: {
        NotFound => (1, StatusCode::NOT_FOUND, "NOT_FOUND"),
        Suspended => (2, StatusCode::BAD_REQUEST, "SUSPENDED"),
        Deleted => (3, StatusCode::GONE, "DELETED"),
        SlugExists => (4, StatusCode::CONFLICT, "SLUG_EXISTS"),
    }
}

// Usage:
let err = ErrorCode::NotFound.error("Tenant 'abc' not found");
// -> CqrsError { domain: "tenant", code: "TENANT_NOT_FOUND", internal_code: 4001, ... }