Migration: Consolidated views (#5735)

* add migration

* behind ee_only + index

* no index yet

priv/repo/migrations/20250916154337_add_consolidated_field_to_sites.exs

@@ -0,0 +1,13 @@
+defmodule Plausible.Repo.Migrations.AddConsolidatedFieldToSites do
+  use Ecto.Migration
+
+  import Plausible.MigrationUtils
+
+  def change do
+    if enterprise_edition?() do
+      alter table(:sites) do
+        add :consolidated, :boolean, null: false, default: false
+      end
+    end
+  end
+end