In Odoo 16

You need to create automated action

By using odoo interface

1. Activate developer mode
2. Go to settings -> Automation -> Automated actions
3. Click create
4. Choose a model where you want apply on the action
5. Choose a trigger for example on form modification
6. In field Action To Do, choose Execute python code
7. In the Python code textarea, write action = your_record.unlik()

Note that your_record should be the records data you want to delete

You can also check server actions