/**
 * Memory tier promotion types — records written by MemoryEngine.runTierPromotion().
 * The memory_promotions table schema lives in src/engines/schema/migrate.ts.
 */
/** A single tier-promotion event recorded in memory_promotions. */
export interface MemoryPromotionRecord {
    memoryId: string;
    from: string;
    to: string;
    at: number;
}
/**
 * Minimum access-count thresholds before a memory is eligible for promotion
 * out of a given tier during a promotion sweep.
 */
export declare const PROMOTION_ACCESS_THRESHOLDS: {
    /** prefrontal → hippocampus: accessed at least this many times */
    readonly prefrontal: 3;
    /** hippocampus → cortex: accessed at least this many times */
    readonly hippocampus: 5;
};
