//! Read replica management for query performance scaling
//!
//! Provides read scaling with load balancing capabilities.

/// Read replica configuration
#[derive(Debug, Clone)]
pub struct ReplicaConfig {
    pub read_preference: ReadPreference,
    pub max_lag_ms: u64,
}

#[derive(Debug, Clone)]
pub enum ReadPreference {
    Primary,
    Secondary,
    Nearest,
}

impl Default for ReplicaConfig {
    fn default() -> Self {
        Self {
            read_preference: ReadPreference::Secondary,
            max_lag_ms: 1000,
        }
    }
}

/// Read replica manager
pub struct ReadReplicaManager {
    #[allow(dead_code)] // Replica configuration settings (stored but not currently accessed in implementation)
    config: ReplicaConfig,
}

impl ReadReplicaManager {
    pub fn new(config: ReplicaConfig) -> Self {
        Self { config }
    }
}