Change link previews to keep original URL from the status (#27312)

app/models/preview_cards_status.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: preview_cards_statuses
+#
+#  preview_card_id :bigint(8)        not null
+#  status_id       :bigint(8)        not null
+#  url             :string
+#
+class PreviewCardsStatus < ApplicationRecord
+  # Composite primary keys are not properly supported in Rails. However,
+  # we shouldn't need this anyway...
+  self.primary_key = nil
+
+  belongs_to :preview_card
+  belongs_to :status
+end