/**
 * Memory Journal MCP Server - Analytics Digest
 *
 * Computes and persists analytical snapshots for proactive insight surfacing.
 * Uses the same SQL patterns as statistics.ts and importance.ts.
 */
import type { Database } from 'better-sqlite3';
/** A single stale project entry */
export interface StaleProject {
    projectNumber: number;
    lastEntryDate: string;
    daysSilent: number;
}
/** A top-importance entry summary */
export interface TopImportanceEntry {
    id: number;
    score: number;
    preview: string;
}
/** Full digest snapshot structure */
export interface DigestSnapshot {
    computedAt: string;
    currentPeriodEntries: number;
    previousPeriodEntries: number;
    activityGrowthPercent: number | null;
    currentPeriodSignificant: number;
    historicalAvgSignificant: number;
    significanceMultiplier: number | null;
    staleProjects: StaleProject[];
    currentRelDensity: number;
    previousRelDensity: number;
    topImportanceEntries: TopImportanceEntry[];
}
/**
 * Compute a full DigestSnapshot from the database.
 * All queries are synchronous (better-sqlite3) and individually lightweight.
 */
export declare function computeDigest(db: Database, workspaceId?: string): DigestSnapshot;
/**
 * Save an analytics snapshot to the database.
 * Returns the inserted row ID.
 */
export declare function saveAnalyticsSnapshot(db: Database, type: string, data: Record<string, unknown>): number;
/**
 * Get the latest analytics snapshot of a given type.
 */
export declare function getLatestAnalyticsSnapshot(db: Database, type: string): {
    id: number;
    createdAt: string;
    data: Record<string, unknown>;
} | null;
/**
 * Get multiple analytics snapshots of a given type (for historical comparison).
 */
export declare function getAnalyticsSnapshots(db: Database, type: string, limit?: number): {
    id: number;
    createdAt: string;
    data: Record<string, unknown>;
}[];
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