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The point is to decouple the key-value storage layer and the event notification layer clearly. It gives the watchableKV the flexibility to define whatever event structure it wants without breaking the ondisk format at key-value storage layer. Changes: 1. change the format of key and value stored in backend Store KeyValue struct instead of Event struct in backend value for better abstraction as xiang suggests. And record the corresponded action in the backend key. 2. Remove word 'event' from functions