//! The vista suite each SQL backend runs: typed and YAML-built vistas over a
//! seeded product table (`vista/product.rs`), and YAML references and `base:`
//! derivations over a client/orders pair (`vista/client_orders.rs`).
//!
//! A backend's `vista` module imports `vantage_dataset::prelude::*` and
//! `vantage_vista::VistaFactory`, and defines `TestResult` and two fixtures, each
//! taking a `suffix` that keeps tests apart where the database is shared:
//!
//! - `async fn product(suffix: &str) -> (DB, Table<DB, EmptyEntity>)`: a
//! product table with `id`, `name`, `price` and `is_deleted`, holding
//! `a`/Alpha/10, `b`/Beta/20 (deleted) and `c`/Gamma/30;
//! - `async fn clients_orders(suffix: &str) -> (DB, String, String)`:
//! clients `alice` and `bob`, orders `o1`, `o2` (alice, 10 and 20) and
//! `o3` (bob, 30), returning the client and orders table names.
//!
//! It then invokes `vista_tests!(SpecType, "block")`, `block` being the
//! dialect's YAML driver key.