import type { DatabaseSync } from "node:sqlite";
import type { AgentHistoryRecord } from "@/types";
/**
 * Session history repository backed by SQLite without caching.
 * Expects: schema migrations already applied for session_history.
 */
export declare class HistoryRepository {
    private readonly db;
    constructor(db: DatabaseSync);
    findBySessionId(sessionId: string): Promise<AgentHistoryRecord[]>;
    findByAgentId(agentId: string, limit?: number): Promise<AgentHistoryRecord[]>;
    /**
     * Appends a history record and returns the new auto-increment id.
     * Expects: sessionId references an existing session.
     */
    append(sessionId: string, record: AgentHistoryRecord): Promise<number>;
    /**
     * Returns history records after a given id for a session, ordered by id ASC.
     * Expects: afterId >= 0; returns empty array when no records exist after afterId.
     */
    findSinceId(sessionId: string, afterId: number): Promise<AgentHistoryRecord[]>;
    /**
     * Returns the maximum history record id for a session.
     * Returns null when the session has no history records.
     */
    maxId(sessionId: string): Promise<number | null>;
}
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