//! Internal Postgres substrate — `SqlAccumulator`, `DjogiPool`, and `PgConnection`.
//! This module is `pub(crate)` — it is an implementation detail of the framework,
//! not part of the public API. Macro-emitted code routes through `::djogi::__private::pg`
//! (re-exported from `lib.rs`), not through `::djogi::pg` directly.
//! # Module layout
//! | Submodule | Contents |
//! |-------------------|------------------------------------------------------------------|
//! | `accumulator` | `SqlAccumulator` — typed SQL builder with positional `$n` binds |
//! | `pool` | `DjogiPool` wrapping `deadpool_postgres::Pool` |
//! | `connection` | `PgConnection` wrapping `deadpool_postgres::Object` + stmt cache |