Lots of REST systems have ways to denote a deleted resource (e.g. `{ "data": null }`) and some event systems too (e.g. Kafka, empty body and length -1), so I do

Lots of REST systems have ways to denote a deleted resource (e.g. `{ "data": null }`) and some event systems too (e.g. Kafka, empty body and length -1), so I don’t see why you need trigger events to handle deletion.