import type { Message, MemoryStore } from '../core/types';
export interface SQLiteStoreOptions {
    /** Path to the .db file. Defaults to .opc/memory.db */
    dbPath?: string;
    /** Max messages per session before pruning oldest. Default 1000 */
    maxMessagesPerSession?: number;
}
export declare class SQLiteStore implements MemoryStore {
    private db;
    private dbPath;
    private maxMessages;
    private kvCache;
    private ready;
    constructor(options?: SQLiteStoreOptions);
    private init;
    private save;
    get(key: string): Promise<unknown>;
    set(key: string, value: unknown): Promise<void>;
    getConversation(sessionId: string): Promise<Message[]>;
    addMessage(sessionId: string, message: Message): Promise<void>;
    clear(sessionId?: string): Promise<void>;
    /**
     * Full-text search across all conversations.
     * Returns matching messages ranked by relevance.
     */
    search(query: string, limit?: number): Promise<Message[]>;
    /**
     * Get conversation stats.
     */
    stats(): Promise<{
        totalMessages: number;
        sessions: number;
        dbSizeKB: number;
    }>;
    /**
     * Close the database (for graceful shutdown).
     */
    close(): Promise<void>;
}
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