feat: new background work process

This removes all previous dependencies on RabbitMQ and the need to run separate cron and requeueing processes.

spec/factories/webhook_request_factory.rb

@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: webhook_requests
+#
+#  id          :integer          not null, primary key
+#  attempts    :integer          default(0)
+#  error       :text(65535)
+#  event       :string(255)
+#  locked_at   :datetime
+#  locked_by   :string(255)
+#  payload     :text(65535)
+#  retry_after :datetime
+#  url         :string(255)
+#  uuid        :string(255)
+#  created_at  :datetime
+#  server_id   :integer
+#  webhook_id  :integer
+#
+# Indexes
+#
+#  index_webhook_requests_on_locked_by  (locked_by)
+#
+FactoryBot.define do
+  factory :webhook_request do
+    webhook
+    url { "https://example.com" }
+    event { "ExampleEvent" }
+    payload { { "hello" => "world" } }
+
+    before(:create) do |webhook_request|
+      webhook_request.server = webhook_request.webhook&.server
+    end
+
+    trait :locked do
+      locked_by { "test" }
+      locked_at { 5.minutes.ago }
+    end
+  end
+end