public @interface Uid
UIDs identify entities (and properties) uniquely in the meta object model file (objectbox-model/default.json).
With UIDs you can map entities to their meta model representation in a stable way without its name.
Once a UID is set, you can rename the entity as often as you like - ObjectBox keeps track of it automatically.
Thus, it is advisable to lookup the UID in objectbox-model/default.json and use it here before renaming a entity.