add logic to store event modification and deleted event

storage/storage.go

@@ -11,6 +11,7 @@ type Storage interface {
 	GetEvent(string) (*Event, error)
 	GetEvents(namespaces []string) ([]Event, error)
 	AddSubscription(eventid string, subscription Subscription) error
+	UpdateEvent(Event) error
 }
 type StorageImpl struct {
 }