/**
 * IM 活跃/归档会话元数据（ai_sessions），与 chat_messages 消息正文分离。
 */
import type { AISessionStatus } from './session.js';
export interface IMSessionRecord {
    id?: number;
    session_id: string;
    session_key: string;
    platform: string;
    endpoint_id: string;
    scene_id: string;
    scene_type: string;
    model: string;
    status: AISessionStatus;
    created_at: number;
    updated_at: number;
}
export interface CreateIMSessionInput {
    session_key: string;
    platform: string;
    endpoint_id: string;
    scene_id: string;
    scene_type: string;
    model?: string;
}
export interface IMSessionStoreConfig {
    sessionIdleArchiveMs?: number;
}
interface DbModel {
    select(...fields: string[]): {
        where(condition: Record<string, unknown>): Promise<IMSessionRecord[]>;
    };
    create(data: Record<string, unknown>): Promise<unknown>;
    update(data: Record<string, unknown>): {
        where(condition: Record<string, unknown>): Promise<unknown>;
    };
}
export declare function createSessionEpochId(sessionKey: string): string;
export declare class IMSessionStore {
    private readonly model;
    private readonly config;
    constructor(model: DbModel, config?: IMSessionStoreConfig);
    findActive(sessionKey: string): Promise<IMSessionRecord | null>;
    getOrCreateActive(input: CreateIMSessionInput): Promise<IMSessionRecord>;
    touch(sessionId: string): Promise<void>;
    archiveByKey(sessionKey: string): Promise<boolean>;
    archiveIdleForKey(sessionKey: string): Promise<number>;
    hasAnySession(sessionKey: string): Promise<boolean>;
}
export declare class MemoryIMSessionStore {
    private sessions;
    private static readonly MAX_ENTRIES;
    private static readonly ARCHIVED_TTL_MS;
    private prune;
    findActive(sessionKey: string): Promise<IMSessionRecord | null>;
    getOrCreateActive(input: CreateIMSessionInput): Promise<IMSessionRecord>;
    touch(sessionId: string): Promise<void>;
    archiveByKey(sessionKey: string): Promise<boolean>;
    archiveIdleForKey(_sessionKey: string): Promise<number>;
    hasAnySession(sessionKey: string): Promise<boolean>;
}
export {};
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