/**
 * metricsQuery.ts
 *
 * Aggregates request_events telemetry via a Supabase Postgres RPC function.
 * Falls back to zero-filled defaults when Supabase is not configured.
 *
 * SQL function definition: scripts/metrics-rpc.sql
 */
export interface MetricsResponse {
    window: string;
    search: {
        p50: number;
        p95: number;
        p99: number;
        totalRequests: number;
        errorRate: number;
        zeroResultRate: number;
        fallbackRate: number;
        backendBreakdown: Record<string, number>;
        topQueries: string[];
    };
    writes: {
        p50: number;
        p95: number;
        totalRequests: number;
    };
    overall: {
        p95: number;
        errorRate: number;
    };
}
export declare const VALID_WINDOWS: readonly ["1h", "6h", "24h", "7d"];
export type MetricsWindow = (typeof VALID_WINDOWS)[number];
export declare function isValidWindow(w: string): w is MetricsWindow;
/**
 * Query aggregated metrics for the given time window.
 * Returns zero-filled defaults when Supabase is not configured.
 * Throws on Supabase RPC errors so the HTTP handler can return 500.
 */
export declare function queryMetrics(window: MetricsWindow): Promise<MetricsResponse>;
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