import type { Pool } from 'pg';
export interface RecallTracker {
    /** Record that the given memory ids were surfaced to the model for a query. */
    record(params: RecallRecordParams): Promise<void>;
    /** Backend-specific schema migration. Idempotent. */
    migrate(): Promise<void>;
}
export interface RecallRecordParams {
    agentId: string;
    query: string;
    hits: Array<{
        id: string;
        path: string;
        score: number;
    }>;
    nowMs?: number;
}
export declare const RECALL_TABLE = "agent_memory_recalls";
export declare class PgvectorRecallTracker implements RecallTracker {
    private readonly pool;
    private readonly table;
    constructor(pool: Pool, table?: string);
    migrate(): Promise<void>;
    record(params: RecallRecordParams): Promise<void>;
}
/** No-op tracker — used when recall tracking is disabled or the backend isn't pgvector. */
export declare class NullRecallTracker implements RecallTracker {
    record(): Promise<void>;
    migrate(): Promise<void>;
}