/**
 * Session Store
 *
 * SQLite-based persistence for kernel sessions.
 * Enables recovery after server restarts.
 */
import { PersistedSession } from './types';
export declare class SessionStore {
    private db;
    constructor(dbPath?: string);
    /**
     * Create tables if they don't exist
     */
    private initDb;
    /**
     * Insert or update a session
     */
    saveSession(session: PersistedSession): void;
    /**
     * Get a session by ID
     */
    getSession(sessionId: string): PersistedSession | null;
    /**
     * Get all active sessions
     */
    getActiveSessions(): PersistedSession[];
    /**
     * Get orphaned sessions (from previous server run)
     */
    getOrphanedSessions(serverId?: string): PersistedSession[];
    /**
     * Update heartbeat timestamp
     */
    updateHeartbeat(sessionId: string): void;
    /**
     * Update session status
     */
    updateStatus(sessionId: string, status: 'active' | 'orphaned' | 'terminated'): void;
    /**
     * Delete a session
     */
    deleteSession(sessionId: string): void;
    /**
     * Mark all active sessions as orphaned (called on startup)
     */
    markAllOrphaned(serverId?: string, serverInstanceId?: string): number;
    /**
     * Get session by file path
     */
    getSessionByFile(filePath: string): PersistedSession | null;
    /**
     * Cleanup old terminated/orphaned sessions
     */
    cleanupOldSessions(maxAgeHours?: number): number;
    /**
     * Get dead sessions (orphaned or terminated) - candidates for cleanup
     */
    getDeadSessions(serverId?: string): PersistedSession[];
    /**
     * Delete specific sessions by ID
     */
    deleteSessions(sessionIds: string[]): number;
    /**
     * Save kernel preference for a notebook file.
     */
    saveNotebookKernelPreference(filePath: string, kernelName: string, serverId?: string | null): void;
    /**
     * Get kernel preference for a notebook file.
     */
    getNotebookKernelPreference(filePath: string): {
        kernelName: string;
        serverId: string | null;
        updatedAt: number;
    } | null;
    /**
     * Delete kernel preference for a notebook file.
     */
    deleteNotebookKernelPreference(filePath: string): void;
    /**
     * Close database connection
     */
    close(): void;
    /**
     * Convert database row to PersistedSession
     */
    private rowToSession;
}