import type { DatabaseSync } from 'node:sqlite';
import type { ScenePrincipal } from './contracts.js';
/** Explicit feedback is a usefulness signal, not proof of adoption or saved time. */
export declare class SceneMetrics {
    private readonly db;
    private readonly clock;
    private readonly modelRef;
    constructor(db: DatabaseSync, clock?: () => number, modelRef?: () => string | null);
    diagnostics(principal: ScenePrincipal): {
        checksPaused: boolean;
        currentModel: string;
        pendingChecks: number;
        oldestDueWaitMs: number;
        notifications: Record<string, import("node:sqlite").SQLOutputValue>[];
        activations: Record<string, import("node:sqlite").SQLOutputValue>[];
    };
    forUser(principal: ScenePrincipal, days?: number): {
        window: {
            since: number;
            until: number;
            days: number;
        };
        ratedOutcomes: number;
        usefulOutcomes: number;
        unhelpfulOutcomes: number;
        scenesWithUsefulOutcomes: number;
        checks: number;
        failedChecks: number;
        skippedChecks: number;
    };
}