Adding Persistent Event

Instructions

Copy this checklist and check off items as you complete them. Note that some items are conditional:

Task Progress:
- [ ] Create a new sealed interface if needed.
- [ ] Create the event class.
- [ ] Create typealias(es) for the event class.
- [ ] Create a new subject payload class if needed.
- [ ] Make sure the subject is handled in EventLogPayloadTransformer.
- [ ] Add custom FieldsUpdatedAction logic to EventLogPayloadTransformer if needed.
- [ ] Add a database migration to backfill events for existing entities if needed.
- [ ] Add code to publish the new event.
- [ ] Add test(s) for any new logic in EventLogPayloadTransformer.
- [ ] Add test(s) or modify existing tests to verify code that publishes the new event.
- [ ] Generate translations of localized strings with `yarn translate`.
- [ ] Format code with `./gradlew spotlessApply`.
- [ ] Run all tests with `./gradlew test`.

Reference

See EVENTS.md for detailed documentation including best practices.