Doctrine: how to describe manyToOne relation with composite key and update cascade?

I have a table that has composite primary key: id + est_date. And it has an entity:

class Parent
{
    /**
     * @ORMId
     */
    private $id;

    /**
     * @ORMId
     */
    private int $estDate;
...
}

Now I need to create a related table and its entity.

class Child
{
...
    /**
     * don't know what to write here
     */
    private $parentId;

    /**
     * don't know what to write here
     */
    private int $parentEstDate;
...
}

How to discribe relation ManyToOne (many “Child” entities may relate to 1 “Parent”)? And the second issue is – “estDate” of the “Parent” may change. How to specify cascade update in “Child”?
Please don’t write that doctrine doesn’t recomment to use composite keys. I know that.