new revision model

app/models/status_revision.rb

@@ -0,0 +1,13 @@
+# == Schema Information
+#
+# Table name: status_revisions
+#
+#  id         :bigint(8)        not null, primary key
+#  status_id  :bigint(8)
+#  text       :string
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+
+class StatusRevision < ApplicationRecord
+end