How to implement a feed of events that have a different structure (database schema)?

Question

Software design

You need to implement something like an event feed, in which each object has a different structure.
What is required:
1. The ability to get the objects associated with the event. For example, if a comment was added to a discussion, then the ability to get this comment (i.e., its id must be stored somewhere). Important: an event can have several related objects (links to different tables).
2. When deleting one of the objects associated with the event (or changing it), the event should be removed from the feed. You don't need to add it again.
3. Possibility to get all events with one request in chronological order. In order to be able to display the latest events in the feed, for example.
How to implement all this correctly from the point of view of architecture?
Example: https://phabricator.wikimedia.org/

Answer 1

Polymorphic relationships?