Add retention policy for cached content and media (#19232)

spec/lib/vacuum/backups_vacuum_spec.rb

@@ -0,0 +1,24 @@
+require 'rails_helper'
+
+RSpec.describe Vacuum::BackupsVacuum do
+  let(:retention_period) { 7.days }
+
+  subject { described_class.new(retention_period) }
+
+  describe '#perform' do
+    let!(:expired_backup) { Fabricate(:backup, created_at: (retention_period + 1.day).ago) }
+    let!(:current_backup) { Fabricate(:backup) }
+
+    before do
+      subject.perform
+    end
+
+    it 'deletes backups past the retention period' do
+      expect { expired_backup.reload }.to raise_error ActiveRecord::RecordNotFound
+    end
+
+    it 'does not delete backups within the retention period' do
+      expect { current_backup.reload }.to_not raise_error
+    end
+  end
+end