/**
 * Index Analytics and Performance Monitoring
 *
 * Tracks index usage, query performance, and generates optimization recommendations.
 * Uses Rust implementation via WASM for performance-critical operations,
 * with TypeScript fallback when WASM unavailable.
 */
export interface IndexMetrics {
    name: string;
    reads: number;
    writes: number;
    hitRate: number;
    avgQueryTimeMs: number;
    avgWriteTimeMs: number;
    entries: number;
    lastUsedAt: number;
    createdAt: number;
}
export interface QueryTrace {
    timestamp: number;
    fields: string[];
    operator: string;
    indexUsed?: string;
    executionTimeMs: number;
    rowsScanned: number;
    resultCount: number;
}
export interface PerformanceReport {
    collectionName: string;
    period: 'hourly' | 'daily' | 'weekly';
    totalQueries: number;
    indexedQueries: number;
    fullScans: number;
    avgQueryTimeMs: number;
    slowestQuery?: QueryTrace;
    indexMetrics: IndexMetrics[];
    recommendations: TuningRecommendation[];
    timestamp: number;
}
export interface TuningRecommendation {
    type: 'create_index' | 'drop_index' | 'optimize_index';
    priority: 'high' | 'medium' | 'low';
    indexName?: string;
    reason: string;
    expectedSpeedup?: number;
    estimatedROI?: number;
}
/**
 * Tracks index usage and query performance.
 */
export declare class IndexAnalytics {
    private metrics;
    private queryTraces;
    private fieldQueryCount;
    private maxTraces;
    /**
     * Record an index usage event.
     */
    recordIndexUsage(indexName: string, operation: 'read' | 'write', timeMs: number): void;
    /**
     * Record a query execution.
     */
    recordQuery(fields: string[], operator: string, executionTimeMs: number, rowsScanned: number, resultCount: number, indexUsed?: string): void;
    /**
     * Get metrics for an index.
     */
    getIndexMetrics(indexName: string): IndexMetrics | null;
    /**
     * Get all index metrics.
     */
    getAllMetrics(): IndexMetrics[];
    /**
     * Get query traces (for performance analysis).
     */
    getQueryTraces(limit?: number): QueryTrace[];
    /**
     * Get slowest queries.
     */
    getSlowestQueries(limit?: number): QueryTrace[];
    /**
     * Get most frequently queried fields.
     */
    getFrequentFields(limit?: number): Array<[string, number]>;
    /**
     * Calculate hit rate for an index.
     */
    calculateHitRate(indexName: string): number;
    /**
     * Generate performance report.
     */
    generateReport(collectionName: string, period?: 'hourly' | 'daily' | 'weekly'): PerformanceReport;
    /**
     * Generate tuning recommendations based on usage patterns.
     */
    private generateRecommendations;
    /**
     * Reset analytics (for testing or period rollover).
     */
    reset(): void;
}
/**
 * Automatic tuning engine - applies recommendations automatically.
 */
export declare class AutoTuner {
    private analytics;
    private appliedRecommendations;
    constructor(analytics: IndexAnalytics);
    /**
     * Check if a recommendation should be auto-applied.
     */
    shouldAutoApply(recommendation: TuningRecommendation): boolean;
    /**
     * Apply a recommendation.
     */
    applyRecommendation(recommendation: TuningRecommendation): boolean;
    /**
     * Get recommendations that are ready for auto-apply.
     */
    getAutoApplyableRecommendations(report: PerformanceReport): TuningRecommendation[];
}
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