Macro tracked 

macro_rules! tracked {
    ($ty:ident { $($field:ident : $value:expr),* $(,)? }) => { ... };
    ($ty:ident { $($field:ident : $value:expr),* , .. $rest:expr $(,)? }) => { ... };
}

Wrap a model struct literal and track which fields were explicitly provided.

This is the Rust equivalent of Pydantic’s “fields_set” tracking and enables correct exclude_unset behavior for dumps via TrackedModel::sql_model_dump().

Examples:

use sqlmodel::tracked;

let user = tracked!(User {
    id: 1,
    name: "Alice".to_string(),
    ..Default::default()
});

// Omits fields that came from defaults, keeps explicitly provided fields.
let json = user.sql_model_dump(DumpOptions::default().exclude_unset())?;