diff --git a/config/prod.exs b/config/prod.exs
index c8a7e59..5408599 100644
--- a/config/prod.exs
+++ b/config/prod.exs
@@ -15,7 +15,7 @@ config :chiya, ChiyaWeb.Endpoint, cache_static_manifest: "priv/static/cache_mani
 config :swoosh, api_client: Swoosh.ApiClient.Finch, finch_name: Chiya.Finch
 
 # Do not print debug messages in production
-config :logger, level: :info
+config :logger, level: :debug
 
 # Runtime production configuration, including reading
 # of environment variables, is done on config/runtime.exs.
diff --git a/lib/chiya/notes/note_note.ex b/lib/chiya/notes/note_note.ex
index a2ae964..2ccaf84 100644
--- a/lib/chiya/notes/note_note.ex
+++ b/lib/chiya/notes/note_note.ex
@@ -15,5 +15,6 @@ defmodule Chiya.Notes.NoteNote do
     note_note
     |> cast(attrs, [:source_id, :target_id])
     |> validate_required([:source_id, :target_id])
+    |> unique_constraint([:source_id, :target_id])
   end
 end