/**
 * agent_sessions CRUD — epoch-aware session metadata (ADR 0009 D4).
 */
import type { AgentSessionRecord, CreateAgentSessionInput } from './agent-db-models.js';
export interface AgentSessionStoreConfig {
    sessionIdleArchiveMs?: number;
}
interface DbModel {
    select(...fields: string[]): {
        where(condition: Record<string, unknown>): Promise<AgentSessionRecord[]>;
    };
    create(data: Record<string, unknown>): Promise<unknown>;
    update(data: Record<string, unknown>): {
        where(condition: Record<string, unknown>): Promise<unknown>;
    };
}
export declare function createAgentSessionEpochId(sessionKey: string): string;
export declare class AgentSessionStore {
    private readonly model;
    private readonly config;
    constructor(model: DbModel, config?: AgentSessionStoreConfig);
    findActive(sessionKey: string): Promise<AgentSessionRecord | null>;
    getOrCreateActive(input: CreateAgentSessionInput): Promise<AgentSessionRecord>;
    touch(sessionId: string): Promise<void>;
    getBySessionId(sessionId: string): Promise<AgentSessionRecord | null>;
    setActiveLeafMessageId(sessionId: string, messageId: number | null): Promise<void>;
    archiveByKey(sessionKey: string): Promise<boolean>;
    archiveIdleForKey(sessionKey: string): Promise<number>;
}
export declare class MemoryAgentSessionStore {
    private sessions;
    private static readonly MAX_SESSIONS;
    private static readonly IDLE_ARCHIVE_MS;
    private evictIfNeeded;
    findActive(sessionKey: string): Promise<AgentSessionRecord | null>;
    getOrCreateActive(input: CreateAgentSessionInput): Promise<AgentSessionRecord>;
    touch(sessionId: string): Promise<void>;
    getBySessionId(sessionId: string): Promise<AgentSessionRecord | null>;
    setActiveLeafMessageId(sessionId: string, messageId: number | null): Promise<void>;
    archiveByKey(sessionKey: string): Promise<boolean>;
    archiveIdleForKey(sessionKey: string): Promise<number>;
    dispose(): void;
    get sessionCount(): number;
}
export {};
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