Add migration for organisation name changes

db/migrate/20250409113321_create_organisation_name_changes.rb

@@ -0,0 +1,15 @@
+class CreateOrganisationNameChanges < ActiveRecord::Migration[7.2]
+  def change
+    create_table :organisation_name_changes do |t|
+      t.references :organisation, null: false, foreign_key: true
+      t.string :name, null: false
+      t.string :change_type
+      t.datetime :change_date, null: false
+      t.datetime :discarded_at
+
+      t.timestamps
+    end
+
+    add_index :organisation_name_changes, %i[organisation_id change_date], unique: true, name: "index_org_name_changes_on_org_id_and_change_date"
+  end
+end

db/schema.rb

@@ -497,6 +497,18 @@ ActiveRecord::Schema[7.2].define(version: 2025_03_05_092900) do
     t.boolean "show_additional_page"
   end
 
+  create_table "organisation_name_changes", force: :cascade do |t|
+    t.bigint "organisation_id", null: false
+    t.string "name", null: false
+    t.string "change_type"
+    t.datetime "change_date", null: false
+    t.datetime "discarded_at"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["organisation_id", "change_date"], name: "index_org_name_changes_on_org_id_and_change_date", unique: true
+    t.index ["organisation_id"], name: "index_organisation_name_changes_on_organisation_id"
+  end
+
   create_table "organisation_relationships", force: :cascade do |t|
     t.integer "child_organisation_id"
     t.integer "parent_organisation_id"