chore: remove immutable from custom fields

priv/repo/migrations/20251211172549_remove_immutable_from_custom_fields.exs

@@ -0,0 +1,21 @@
+defmodule Mv.Repo.Migrations.RemoveImmutableFromCustomFields do
+  @moduledoc """
+  Removes the immutable column from custom_fields table.
+
+  The immutable field is no longer needed in the custom field definition.
+  """
+
+  use Ecto.Migration
+
+  def up do
+    alter table(:custom_fields) do
+      remove :immutable
+    end
+  end
+
+  def down do
+    alter table(:custom_fields) do
+      add :immutable, :boolean, null: false, default: false
+    end
+  end
+end