interface SubresourceCrudInterface<T, U> {
    create(parentId: number, resource: U): Promise<T | null>;
    get(parentId: number, childId: number, parameters: object): Promise<T | null>;
    getAll(parentId: number, parameters: object): Promise<T[]>;
    update(parentId: number, childId: number, resource: T): Promise<void>;
    delete(parentId: number, childId: number): Promise<void>;
}