# persistance vs model update of a room
## persist first, return update object, update model with update object
- we went with this
## update model first, return update object, persist with update object
- not all models exist at all times (timeline only when room is "open"),
so model to create timeline update object might not exist for persistence need
## persist, update, each only based on sync data (independent of each other)
- possible inconsistency between syncing and loading from storage as they are different code paths
+ storage code remains very simple and focussed
## updating model and persisting in one go
- if updating model needs to do anything async, it needs to postpone it or the txn will be closed
## persist first, read from storage to update model
+ guaranteed consistency between what is on screen and in storage
- slower as we need to reread what was just synced every time (big accounts with frequent updates)
