[websockets] remark on UserSource/UserAction

src/Gargantext/Core/AsyncUpdates.hs

@@ -62,6 +62,14 @@ data UpdateAction =
   UpdateTree NodeId
   deriving (Eq, Show)
 
+
+-- NOTE: I'm not sure if UserAction/UserSource is needed. I initially
+-- created that to mark who initiated the action, but I think we don't
+-- need it.
+--
+-- Suppose we send an 'UpdateTree node_id' message: from the DB we can
+-- infer all users that are associated with that node (I do keep in
+-- mind that we can share nodes to other users).
 data UserSource =
     USUser UserId
   | USSystem
@@ -72,7 +80,8 @@ data UserSource =
 data UserAction =
   UserAction UserSource UpdateAction
   deriving (Eq, Show)
-    
+
+  
 -- | Represents a notification that goes to a given user. This is
 --   directly sent via WebSockets.
 data UserNotification =