import type { UIMessage } from 'ai';
export type ChatTurn = {
    role: 'user' | 'assistant';
    content: string;
    createdAt: string;
};
export declare function loadHistory(sessionId: string): Promise<UIMessage<unknown, import("ai").UIDataTypes, import("ai").UITools>[]>;
export declare function saveHistory(sessionId: string, messages: UIMessage[]): Promise<void>;
export declare function loadTurns(sessionId: string): Promise<ChatTurn[]>;
export declare function saveTurns(sessionId: string, turns: ChatTurn[]): Promise<void>;
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