Add comments for the subscriptionHistoryEvent call (#21946)

app/user.go

@@ -316,7 +316,11 @@ func (a *App) createUserOrGuest(c request.CTX, user *model.User, guest bool) (*m
 		}, plugin.UserHasBeenCreatedID)
 	})
 
-	// Create/Update the subscriptionHistoryEvent
+	// For cloud yearly subscriptions, if the current user count of the workspace exceeds the number of seats initially purchased
+	// (plus the “threshold” of 10%), then a subscriptionHistoryEvent object would need to be created and added to the subscriptionHistory
+	// table in CWS. This is then used to calculate how much the customers have to pay in addition for the extra users. If the
+	// workspace is currently on a monthly plan, then this function will not do anything.
+
 	go func() {
 		_, err := a.SendSubscriptionHistoryEvent(ruser.Id)
 		if err != nil {