Need a retro event triggered while adding/updating a new contact

Summary:

While employee adds/updates a dependent, we would like the retro event to be triggered.

Content (please ensure you mask any confidential information):

There is no such event trigger available as such. There are some payroll calculations based on employee dependent details.

Version (include the version you are using, if applicable):

23C

Code Snippet (add any code snippets that support your topic, if applicable):