FEATURE: add setting to show content of forwarded emails in topics (#7935)

db/migrate/20190724162522_migrate_forwarded_emails_behaviour_site_settings.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+class MigrateForwardedEmailsBehaviourSiteSettings < ActiveRecord::Migration[5.2]
+  def up
+    execute <<~SQL
+      UPDATE site_settings
+      SET name      = 'forwarded_emails_behaviour',
+          data_type = 7,
+          value     = 'create_replies'
+      WHERE name = 'enable_forwarded_emails' AND value = 't';
+    SQL
+
+    execute <<~SQL
+      DELETE
+      FROM site_settings
+      WHERE name = 'enable_forwarded_emails';
+    SQL
+  end
+
+  def down
+    execute <<~SQL
+      UPDATE site_settings
+      SET name      = 'enable_forwarded_emails',
+          data_type = 5,
+          value     = 't'
+      WHERE name = 'forwarded_emails_behaviour' AND value = 'create_replies';
+    SQL
+
+    execute <<~SQL
+      DELETE
+      FROM site_settings
+      WHERE name = 'forwarded_emails_behaviour';
+    SQL
+  end
+end