//! Write-Ahead Log (WAL)
//!
//! Provides durability guarantees for record operations.
//!
//! # Architecture
//!
//! ```text
//! ┌─────────────────────────────────────────────────────────────┐
//! │ Write-Ahead Log (WAL) │
//! ├─────────────────────────────────────────────────────────────┤
//! │ 1. Log entry to WAL (fsync) │
//! │ 2. Apply to in-memory buffer │
//! │ 3. Periodically checkpoint to persistent store │
//! │ 4. Truncate WAL after successful checkpoint │
//! └─────────────────────────────────────────────────────────────┘
//! ```
//!
//! # Invariants
//!
//! - INV-003: WAL-before-buffer (operations logged before applied)
//!
//! # Entry Types
//!
//! - Insert: Add a new record
//! - UpdateStats: Update outcome statistics
//! - Delete: Mark record as deleted
pub use ;
pub use WalReader;
pub use ;