Revert "Remove ApplicationRecord"

This reverts commit cf149b3.

Author: blocknotes

app/models/active_storage_db/application_record.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+module ActiveStorageDB
+  class ApplicationRecord < ActiveRecord::Base
+    self.abstract_class = true
+  end
+end

app/models/active_storage_db/file.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 module ActiveStorageDB
-  class File < ActiveRecord::Base
+  class File < ApplicationRecord
     validates :ref,
               presence: true,
               allow_blank: false,