improve invites, record usage

priv/repo/migrations/20230204191547_record_invites.exs

@@ -0,0 +1,11 @@
+defmodule Memex.Repo.Migrations.RecordInvites do
+  use Ecto.Migration
+
+  def change do
+    alter table(:users) do
+      add :invite_id, references(:invites, type: :binary_id)
+    end
+
+    rename table(:invites), :user_id, to: :created_by_id
+  end
+end