Problem/Motivation
In order to intercept an entity after it has saved, both hook_entity_insert and hook_entity_update must be implemented.
Proposed resolution
Add hook_entity_postsave. Detect if entity is new or being updated using entity API: $entity->isNew()
Remaining tasks
User interface changes
None
API changes
Deprecate hook_entity_[type_]insert and hook_entity_[type_]update.
Data model changes
Original report by ivanjaros
We already have a hook_entity_presave hook so why don't we also have hook_entity_postsave?
In current state if I want to run some logic after the entity hase been saved, and I don't care if it is/was new or already existing entity, I have to implement TWO hooks instead of just one: hook_entity_insert AND hook_entity_update.