//! The delete, custom action and header action handlers, the CSV export, and
//! the relationship option search.
//!
//! Fetch, policy checks, and writes share one framework transaction:
//! a mid-loop failure deletes zero rows.
//!
//! The record fetchers live in `fetch`, the one pipeline the deletes and the
//! custom actions share in `mutation`, a many-to-many relation's attach and detach in `link`,
//! the CSV export and its chunk walker in `export`, and the relationship option search in
//! `options`.
pub use ;