* Add sub label to model and set / delete funs
* Add migrations for sub label
* Tweaks to API and model
* Show sublabel if available
* Cleanups
* Update docs
* Show person in UI title
* Fix typo and don't fail on no json
* Transfer sub labels for in progress events
* Remove sublabel reset
* Remove person only check
* Make default null
* Update docs and formatting
* Make default null
* Make nullable in migration
* Undo null
* Update model to accept null
* Update migration to accept null
* Don't set to default values
* Remove redundant defaults and update http logic
* Only need a single route
* Enforce 20 character limit in http
* Update docs to mention 20 character limit
* Cleanup
* Separate insert and update to make sure updated values are retained when event ends
* Use insert instead of replace
* Remove redundant if and have should_update_db include clip or snapshot requirement.
