/**
 * Tool: get_database_health
 * Returns overall database health metrics and identifies performance issues
 */
export interface DatabaseHealthOutput {
    database_size: {
        total_size: string;
        total_size_bytes: number;
    };
    cache_performance: {
        cache_hit_ratio: number;
        buffer_cache_hit_ratio: number;
        index_cache_hit_ratio: number;
    };
    table_statistics: {
        total_tables: number;
        tables_never_vacuumed: number;
        tables_never_analyzed: number;
        tables_with_high_bloat: number;
    };
    index_statistics: {
        total_indexes: number;
        unused_indexes: number;
        total_index_size: string;
    };
    connection_info: {
        max_connections: number;
        current_connections: number;
        connection_utilization_percent: number;
        idle_connections: number;
        active_connections: number;
    };
    replication_health?: {
        is_primary: boolean;
        replication_slots: number;
        active_replicas: number;
        max_lag_bytes?: number;
        max_lag_seconds?: number;
    };
    constraint_health: {
        total_constraints: number;
        invalid_constraints: number;
        invalid_constraint_details: Array<{
            schema: string;
            table: string;
            constraint_name: string;
            constraint_type: string;
        }>;
    };
    sequence_health: {
        total_sequences: number;
        sequences_at_risk: number;
        at_risk_details: Array<{
            schema: string;
            sequence: string;
            current_value: number;
            max_value: number;
            percent_used: number;
        }>;
    };
    performance_issues: string[];
    recommendations: string[];
}
/**
 * Gets comprehensive database health metrics
 */
export declare function getDatabaseHealth(): Promise<DatabaseHealthOutput>;
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