import { Database as DatabaseType } from 'better-sqlite3';
declare const db: DatabaseType;
export declare function saveUserApiKey(username: string, apiKey: string): void;
export declare function getUserApiKey(username: string): string | null;
export declare function verifyUserApiKey(username: string, apiKey: string): boolean;
export declare function deleteUserApiKey(username: string): void;
export declare function getUserSettings(): {
    max_content_length: number;
    max_token: number;
    lock_duration: number;
    proxy_url: string;
};
export declare function saveUserSettings(max_content_length: number, max_token: number, lock_duration: number, proxy_url?: string): void;
export declare function getMcpRecord(userId: number): {
    content: string;
} | null;
export declare function upsertMcpRecord(userId: number, content: string): void;
export declare function getAgentMemoryUserList(userId: number): {
    id: number;
    description: string | null;
    content: string | null;
}[];
export declare function getAgentMemoryUserById(id: number, userId: number): {
    id: number;
    description: string | null;
    content: string | null;
} | null;
export declare function createAgentMemoryUser(description: string | null, content: string | null, userId: number): {
    id: number;
};
export declare function updateAgentMemoryUser(id: number, description: string | null, content: string | null, userId: number): boolean;
export declare function deleteAgentMemoryUser(id: number, userId: number): boolean;
export declare function getAgentMemorySkillsList(userId: number): {
    id: number;
    description: string | null;
    content: string | null;
}[];
export declare function getAgentMemorySkillsById(id: number, userId: number): {
    id: number;
    description: string | null;
    content: string | null;
} | null;
export declare function createAgentMemorySkills(description: string | null, content: string | null, userId: number): {
    id: number;
};
export declare function updateAgentMemorySkills(id: number, description: string | null, content: string | null, userId: number): boolean;
export declare function deleteAgentMemorySkills(id: number, userId: number): boolean;
export declare function getAgentMemoryDocsList(userId: number): {
    id: number;
    description: string | null;
    content: string | null;
}[];
export declare function getAgentMemoryDocsById(id: number, userId: number): {
    id: number;
    description: string | null;
    content: string | null;
} | null;
export declare function createAgentMemoryDocs(description: string | null, content: string | null, userId: number): {
    id: number;
};
export declare function updateAgentMemoryDocs(id: number, description: string | null, content: string | null, userId: number): boolean;
export declare function deleteAgentMemoryDocs(id: number, userId: number): boolean;
export declare function getUserFilesList(userId: number): {
    id: number;
    original_name: string;
    stored_name: string;
    mime_type: string | null;
    file_size: number;
    created_at: string;
}[];
export declare function getUserFileById(id: number, userId: number): {
    id: number;
    original_name: string;
    stored_name: string;
    mime_type: string | null;
    file_size: number;
    created_at: string;
} | null;
export declare function createUserFile(originalName: string, storedName: string, mimeType: string | null, fileSize: number, userId: number): {
    id: number;
};
export declare function deleteUserFile(id: number, userId: number): {
    stored_name: string;
} | null;
export interface ChatSessionRecord {
    id: string;
    title: string;
    modelName: string;
    createdAt: number;
    updatedAt: number;
    messages: any[];
}
/** 获取用户全部会话（按最近更新倒序） */
export declare function listChatSessions(userId: number): ChatSessionRecord[];
/** 获取用户单个会话 */
export declare function getChatSession(id: string, userId: number): ChatSessionRecord | null;
/** 新增或更新会话（upsert，created_at 以首次写入为准） */
export declare function upsertChatSession(userId: number, session: ChatSessionRecord): void;
/** 删除会话，返回是否命中记录 */
export declare function deleteChatSession(id: string, userId: number): boolean;
/** 清空用户全部会话，返回删除条数 */
export declare function deleteAllChatSessions(userId: number): number;
export default db;
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