improve accuracy of timestamps

lib/memex/notes/note.ex

@@ -24,7 +24,7 @@ defmodule Memex.Notes.Note do
 
     field :user_id, :binary_id
 
-    timestamps()
+    timestamps(type: :utc_datetime_usec)
   end
 
   @type t :: %__MODULE__{
@@ -34,8 +34,8 @@ defmodule Memex.Notes.Note do
           tags_string: String.t() | nil,
           visibility: :public | :private | :unlisted,
           user_id: User.id(),
-          inserted_at: NaiveDateTime.t(),
-          updated_at: NaiveDateTime.t()
+          inserted_at: DateTime.t(),
+          updated_at: DateTime.t()
         }
   @type id :: UUID.t()
   @type slug :: String.t()