/**
 * Tool: analyze_query_performance
 * Analyzes slow queries using pg_stat_statements (if available) or provides query execution plan
 */
export interface AnalyzeQueryPerformanceInput {
    query?: string;
    topN?: number;
}
export interface SlowQuery {
    query: string;
    calls: number;
    total_time_ms: number;
    mean_time_ms: number;
    max_time_ms: number;
    rows: number;
    shared_blks_hit: number;
    shared_blks_read: number;
    cache_hit_ratio: number;
}
export interface QueryPlan {
    query: string;
    plan: any;
    execution_time_ms?: number;
    planning_time_ms?: number;
}
export interface AnalyzeQueryPerformanceOutput {
    has_pg_stat_statements: boolean;
    slow_queries?: SlowQuery[];
    query_plan?: QueryPlan;
    recommendations: string[];
}
/**
 * Analyzes query performance using pg_stat_statements or EXPLAIN
 */
export declare function analyzeQueryPerformance(input: AnalyzeQueryPerformanceInput): Promise<AnalyzeQueryPerformanceOutput>;
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