//! # Apache Kafka Backend - Modular Architecture
//!
//! Complete Apache Kafka integration for enterprise-scale RDF streaming.
//!
//! This module provides comprehensive Kafka integration with transactional producers,
//! exactly-once semantics, schema registry, consumer groups, and advanced performance
//! optimizations for mission-critical RDF streaming applications.
//!
//! ## Architecture
//!
//! This module is a thin facade. The implementation is split across sibling modules:
//! - [`super::backend_types`] — consumer identifiers, metrics, partition
//! assignments, and the rdkafka rebalance callback context.
//! - [`super::backend_producer`] — the [`KafkaBackend`] struct, connection setup,
//! topic creation, and producer-side publishing / statistics.
//! - [`super::backend_consumer`] — persistent/streaming consumer management,
//! lifecycle control, offset seeking, and consumer metrics.
//! - [`super::backend_trait`] — the [`StreamBackend`](crate::backend::StreamBackend)
//! trait implementation for [`KafkaBackend`].
pub use KafkaBackend;
pub use ;