//! Real-time subscription system.
//!
//! Forge provides automatic real-time updates via PostgreSQL LISTEN/NOTIFY.
//! When tables change, affected subscriptions are invalidated and re-executed.
//!
//! # Architecture
//!
//! ```text
//! Client Gateway PostgreSQL
//! │ │ │
//! │─── Subscribe ───────>│ │
//! │ │── Execute query ───────>│
//! │<── Initial data ─────│<── Results ────────────│
//! │ │ │
//! │ │<── NOTIFY on change ───│
//! │ │── Re-execute query ───>│
//! │<── Delta update ─────│<── New results ────────│
//! ```
//!
//! # Key Types
//!
//! - [`ReadSet`] - Tables a subscription depends on
//! - [`QueryGroup`] - Coalesced subscriptions sharing query+args+auth_scope
//! - [`Subscriber`] - Lightweight subscriber within a query group
//! - [`Delta`] - Change payload sent to clients
pub use ;
pub use ;
pub use ;