add lock events

app/models/lock_event.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: lock_events
+#
+#  id         :bigint           not null, primary key
+#  event_name :string           not null
+#  key        :string           not null
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+# Indexes
+#
+#  index_lock_events_on_event_name_and_key  (event_name,key) UNIQUE WHERE ((event_name)::text = ANY ((ARRAY['start'::character varying, 'complete'::character varying])::text[]))
+#  index_lock_events_on_key                 (key)
+#
+class LockEvent < ApplicationRecord
+  enum :event_name, {
+    complete: 'complete',
+    fail: 'fail',
+    start: 'start',
+    retry: 'retry'
+  }, scope: false
+end