add migration for missing value

Author: SamSaffron

db/migrate/20250429060311_move_dall_e_url.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+class MoveDallEUrl < ActiveRecord::Migration[7.2]
+  def up
+    execute <<~SQL
+      UPDATE site_settings
+      SET name = 'ai_openai_image_generation_url'
+      WHERE name = 'ai_openai_dall_e_3_url'
+      AND NOT EXISTS (
+        SELECT 1
+        FROM site_settings
+        WHERE name = 'ai_openai_image_generation_url')
+    SQL
+
+    execute <<~SQL
+      DELETE FROM site_settings
+      WHERE name = 'ai_openai_dall_e_3_url'
+    SQL
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end