export interface OTATask {
    id?: number;
    device_id: string;
    firmware_id: number;
    status: 'pending' | 'downloading' | 'installing' | 'success' | 'failed';
    progress: number;
    error_message?: string;
    start_time?: Date;
    end_time?: Date;
    created_at?: Date;
    updated_at?: Date;
}
export declare class OTATaskModel {
    static create(taskData: Omit<OTATask, 'id' | 'created_at' | 'updated_at'>): Promise<OTATask>;
    static getById(id: number): Promise<OTATask | null>;
    static getByDeviceId(deviceId: string): Promise<OTATask[]>;
    static getAll(): Promise<OTATask[]>;
    static getByStatus(status: string): Promise<OTATask[]>;
    static getByDeviceIdAndStatus(deviceId: string, status: string): Promise<OTATask[]>;
    static getPendingTasksByDeviceId(deviceId: string): Promise<OTATask[]>;
    static getIncompleteTasksByDeviceId(deviceId: string): Promise<OTATask[]>;
    static updateStatusAndProgress(id: number, status: OTATask['status'], progress: number): Promise<boolean>;
    static updateResult(id: number, status: 'success' | 'failed', errorMessage?: string): Promise<boolean>;
    static delete(id: number): Promise<boolean>;
    static createTable(): Promise<void>;
}
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