minor invite fixes

Author: michaeljguarino

apps/core/lib/core/pubsub/protocols/cacheable.ex

@@ -38,7 +38,8 @@ defimpl Core.PubSub.Cacheable, for: Core.PubSub.ClusterDependencyCreated do
   end
 end
 
-defimpl Core.PubSub.Cacheable, for: Core.PubSub.UserDeleted do
+
+defimpl Core.PubSub.Cacheable, for: [Core.PubSub.UserDeleted, Core.PubSub.UserCreated] do
   def cache(%{item: %{id: user_id}}), do: {:del, {:login, user_id}, nil}
 end
 

apps/core/lib/core/schema/invite.ex

@@ -40,7 +40,7 @@ defmodule Core.Schema.Invite do
     |> foreign_key_constraint(:oidc_provider_id)
     |> foreign_key_constraint(:service_account_id)
     |> unique_constraint(:secure_id)
-    |> unique_constraint(:email)
+    |> unique_constraint(:email, message: "the user with this email has already been invited")
     |> validate_format(:email, @email_re)
     |> validate_required([:email, :account_id,  :secure_id])
   end