I have group and contact entities in OneToMany relationship. I add contacts within the group. When I want to delete, I want both sides of the database to be deleted. but only the group table is deleted.

here's contact.entity

Here's one to many relationship:

here's group.entity

The function I wrote in the service is as follows:

I tried many solutions by searching. Adding cascades on both sides, I know this isn't right, but I wanted to try, but I couldn't get it to work.