diff --git a/app/jobs/target_doi_by_id_job.rb b/app/jobs/target_doi_by_id_job.rb
index f908064f1..b641893a7 100644
--- a/app/jobs/target_doi_by_id_job.rb
+++ b/app/jobs/target_doi_by_id_job.rb
@@ -10,6 +10,7 @@ def perform(id, options={})
     return false if item.blank?
 
     item.set_source_and_target_doi
+    
     if item.save
       Rails.logger.info "Target doi for #{item.uuid} updated."
     else
diff --git a/app/models/concerns/indexable.rb b/app/models/concerns/indexable.rb
index 1eb395685..dab153272 100644
--- a/app/models/concerns/indexable.rb
+++ b/app/models/concerns/indexable.rb
@@ -451,11 +451,11 @@ def create_index
 
       self.__elasticsearch__.create_index!(index: index_name) unless self.__elasticsearch__.index_exists?(index: index_name)
       self.__elasticsearch__.create_index!(index: alternate_index_name) unless self.__elasticsearch__.index_exists?(index: alternate_index_name)
-      
+
       # index_name is the active index
       client = Elasticsearch::Model.client
       client.indices.put_alias index: index_name, name: alias_name unless client.indices.exists_alias?(name: alias_name)
-      
+
       "Created indexes #{index_name} (active) and #{alternate_index_name}."
     end
 
diff --git a/app/models/doi.rb b/app/models/doi.rb
index fe9d06bca..d108eb6dc 100644
--- a/app/models/doi.rb
+++ b/app/models/doi.rb
@@ -80,7 +80,8 @@ class Doi < ActiveRecord::Base
   has_many :part_of, -> { where target_relation_type_id: "part_of" }, class_name: "Event", primary_key: :doi, foreign_key: :target_doi, dependent: :destroy
   has_many :versions, -> { where source_relation_type_id: "versions" }, class_name: "Event", primary_key: :doi, foreign_key: :source_doi, dependent: :destroy
   has_many :version_of, -> { where target_relation_type_id: "version_of" }, class_name: "Event", primary_key: :doi, foreign_key: :target_doi, dependent: :destroy
-  
+  has_many :activities, foreign_key: :auditable_id, dependent: :destroy
+
   delegate :provider, to: :client, allow_nil: true
   delegate :consortium_id, to: :provider, allow_nil: true
 
diff --git a/app/models/provider.rb b/app/models/provider.rb
index 5698eda1c..e52adaf2a 100644
--- a/app/models/provider.rb
+++ b/app/models/provider.rb
@@ -1,7 +1,6 @@
 require "countries"
 
 class Provider < ActiveRecord::Base
-
   # include helper module for caching infrequently changing resources
   include Cacheable
 
diff --git a/config/routes.rb b/config/routes.rb
index 7b7a0925d..da9f6bb61 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -2,13 +2,13 @@
   post "/client-api/graphql", to: "graphql#execute"
   get "/client-api/graphql", to: "index#method_not_allowed"
 
-  root :to => 'index#index'
+  root to: "index#index"
 
   # authentication
-  post 'token', :to => 'sessions#create_token'
+  post "token", to: "sessions#create_token"
 
   # authentication via openid connect in load balancer
-  post 'oidc-token', :to => 'sessions#create_oidc_token'
+  post "oidc-token", to: "sessions#create_oidc_token"
 
   # send reset link
   post 'reset', :to => 'sessions#reset'
diff --git a/spec/jobs/event_registrant_update_by_id_job_spec.rb b/spec/jobs/event_registrant_update_by_id_job_spec.rb
new file mode 100644
index 000000000..99392798d
--- /dev/null
+++ b/spec/jobs/event_registrant_update_by_id_job_spec.rb
@@ -0,0 +1,16 @@
+require "rails_helper"
+
+describe EventRegistrantUpdateByIdJob, type: :job do
+  let(:event) { create(:event) }
+  subject(:job) { EventRegistrantUpdateByIdJob.perform_later(event.uuid) }
+
+  it "queues the job" do
+    expect { job }.to have_enqueued_job(EventRegistrantUpdateByIdJob)
+      .on_queue("test_lupo_background")
+  end
+
+  after do
+    clear_enqueued_jobs
+    clear_performed_jobs
+  end
+end
diff --git a/spec/jobs/event_update_by_id_job.rb b/spec/jobs/event_update_by_id_job.rb
deleted file mode 100644
index e996a9c0b..000000000
--- a/spec/jobs/event_update_by_id_job.rb
+++ /dev/null
@@ -1,16 +0,0 @@
-require 'rails_helper'
-
-describe EventUpdateByIdJob, type: :job do
-  let(:event) { create(:event) }
-  subject(:job) { EventUpdateByIdJob.perform_later(event.uuid) }
-
-  it 'queues the job' do
-    expect { job }.to have_enqueued_job(EventUpdateByIdJob)
-      .on_queue("test_lupo_background")
-  end
-
-  after do
-    clear_enqueued_jobs
-    clear_performed_jobs
-  end
-end
diff --git a/spec/jobs/index_background_job_spec.rb b/spec/jobs/index_background_job_spec.rb
new file mode 100644
index 000000000..2694fe523
--- /dev/null
+++ b/spec/jobs/index_background_job_spec.rb
@@ -0,0 +1,16 @@
+require "rails_helper"
+
+describe IndexBackgroundJob, type: :job do
+  let(:doi) { create(:doi) }
+  subject(:job) { IndexBackgroundJob.perform_later(doi) }
+
+  it "queues the job" do
+    expect { job }.to have_enqueued_job(IndexBackgroundJob)
+      .on_queue("test_lupo_background").at_least(1).times
+  end
+
+  after do
+    clear_enqueued_jobs
+    clear_performed_jobs
+  end
+end
diff --git a/spec/jobs/index_job_spec.rb b/spec/jobs/index_job_spec.rb
index 93daa32d5..cb64beef2 100644
--- a/spec/jobs/index_job_spec.rb
+++ b/spec/jobs/index_job_spec.rb
@@ -1,10 +1,10 @@
-require 'rails_helper'
+require "rails_helper"
 
 describe IndexJob, type: :job do
   let(:doi) { create(:doi) }
   subject(:job) { IndexJob.perform_later(doi) }
 
-  it 'queues the job' do
+  it "queues the job" do
     expect { job }.to have_enqueued_job(IndexJob)
       .on_queue("test_lupo").at_least(1).times
   end
@@ -13,4 +13,4 @@
     clear_enqueued_jobs
     clear_performed_jobs
   end
-end
\ No newline at end of file
+end
diff --git a/spec/jobs/target_doi_by_id_job_spec.rb b/spec/jobs/target_doi_by_id_job_spec.rb
new file mode 100644
index 000000000..d5d70e0aa
--- /dev/null
+++ b/spec/jobs/target_doi_by_id_job_spec.rb
@@ -0,0 +1,16 @@
+require "rails_helper"
+
+describe TargetDoiByIdJob, type: :job do
+  let(:doi) { create(:doi) }
+  subject(:job) { TargetDoiByIdJob.perform_later(doi) }
+
+  it "queues the job" do
+    expect { job }.to have_enqueued_job(TargetDoiByIdJob)
+      .on_queue("test_lupo_background").at_least(1).times
+  end
+
+  after do
+    clear_enqueued_jobs
+    clear_performed_jobs
+  end
+end
diff --git a/spec/jobs/update_state_job.rb b/spec/jobs/update_state_job_spec.rb
similarity index 85%
rename from spec/jobs/update_state_job.rb
rename to spec/jobs/update_state_job_spec.rb
index 11c681b42..c51556648 100644
--- a/spec/jobs/update_state_job.rb
+++ b/spec/jobs/update_state_job_spec.rb
@@ -1,10 +1,10 @@
-require 'rails_helper'
+require "rails_helper"
 
 describe UpdateStateJob, type: :job do
   let(:doi) { create(:doi) }
   subject(:job) { UpdateStateJob.perform_later(doi.doi) }
 
-  it 'queues the job' do
+  it "queues the job" do
     expect { job }.to have_enqueued_job(UpdateStateJob)
       .on_queue("test_lupo_background")
   end
@@ -13,4 +13,4 @@
     clear_enqueued_jobs
     clear_performed_jobs
   end
-end
\ No newline at end of file
+end
diff --git a/spec/models/client_spec.rb b/spec/models/client_spec.rb
index 289d84ff9..7579f4977 100644
--- a/spec/models/client_spec.rb
+++ b/spec/models/client_spec.rb
@@ -1,8 +1,8 @@
-require 'rails_helper'
+require "rails_helper"
 
 describe Client, type: :model do
-  let(:provider)  { create(:provider) }
-  let(:client)  { create(:client, provider: provider) }
+  let(:provider) { create(:provider) }
+  let(:client) { create(:client, provider: provider) }
 
   describe "Validations" do
     it { should validate_presence_of(:symbol) }
diff --git a/spec/models/doi_spec.rb b/spec/models/doi_spec.rb
index e87439b77..adcc358e3 100644
--- a/spec/models/doi_spec.rb
+++ b/spec/models/doi_spec.rb
@@ -606,7 +606,8 @@
   describe "citations", elasticsearch: true do
     let(:client) { create(:client) }
     let(:doi) { create(:doi, client: client, aasm_state: "findable") }
-    let!(:citations) { create_list(:event_for_datacite_crossref, 1, subj_id: "https://doi.org/#{doi.doi}", relation_type_id: "is-referenced-by") }
+    let(:source_doi) { create(:doi, client: client, aasm_state: "findable") }
+    let!(:citations) { create_list(:event_for_datacite_crossref, 1, subj_id: "https://doi.org/#{doi.doi}", obj_id: "https://doi.org/#{source_doi.doi}", relation_type_id: "is-referenced-by") }
 
     before do
       Doi.import
diff --git a/spec/models/event_spec.rb b/spec/models/event_spec.rb
index 0ddd279f2..95b03cc78 100644
--- a/spec/models/event_spec.rb
+++ b/spec/models/event_spec.rb
@@ -1,6 +1,6 @@
-require 'rails_helper'
+require "rails_helper"
 
-describe Event, :type => :model, vcr: true do
+describe Event, type: :model, vcr: true do
   before(:each) { allow(Time.zone).to receive(:now).and_return(Time.mktime(2015, 4, 8)) }
   context "event" do
     subject { create(:event) }
@@ -16,15 +16,15 @@
 
   context "citation" do
     subject { create(:event_for_datacite_related) }
-   
+
     it "has citation_id" do
       expect(subject.citation_id).to eq("https://doi.org/10.5061/dryad.47sd5/1-https://doi.org/10.5061/dryad.47sd5e/1")
     end
-  
+
     it "has citation_year" do
       expect(subject.citation_year).to eq(2015)
     end
-  
+
     it "has published_dates" do
       expect(subject.subj["datePublished"]).to eq("2006-06-13T16:14:19Z")
       expect(subject.obj["datePublished"]).to be_nil
@@ -33,7 +33,7 @@
     let(:doi) { create(:doi) }
 
     it "date_published from the database" do
-      published = subject.date_published("https://doi.org/"+doi.doi)
+      published = subject.date_published("https://doi.org/" + doi.doi)
       expect(published).to eq("2011")
       expect(published).not_to eq(2011)
     end
diff --git a/spec/requests/dois_spec.rb b/spec/requests/dois_spec.rb
index 54ebc093c..8a9e0cd97 100644
--- a/spec/requests/dois_spec.rb
+++ b/spec/requests/dois_spec.rb
@@ -1,4 +1,4 @@
-require 'rails_helper'
+require "rails_helper"
 
 describe "dois", type: :request do
   let(:admin) { create(:provider, symbol: "ADMIN") }
@@ -14,7 +14,7 @@
   let(:bearer) { Client.generate_token(role_id: "client_admin", uid: client.symbol, provider_id: provider.symbol.downcase, client_id: client.symbol.downcase, password: client.password) }
   let(:headers) { { 'HTTP_ACCEPT'=>'application/vnd.api+json', 'HTTP_AUTHORIZATION' => 'Bearer ' + bearer }}
 
-  describe 'GET /dois', elasticsearch: true do
+  describe "GET /dois", elasticsearch: true do
     let!(:dois) { create_list(:doi, 3, client: client, aasm_state: "findable") }
 
     before do
@@ -23,7 +23,7 @@
     end
 
     it 'returns dois', vcr: true do
-      get '/dois', nil, headers
+      get "/dois", nil, headers
 
       expect(last_response.status).to eq(200)
       expect(json['data'].size).to eq(3)
diff --git a/spec/support/elasticsearch_helper.rb b/spec/support/elasticsearch_helper.rb
index a4d4ecdd3..6702b97cb 100644
--- a/spec/support/elasticsearch_helper.rb
+++ b/spec/support/elasticsearch_helper.rb
@@ -1,5 +1,5 @@
 ## https://github.com/elastic/elasticsearch-ruby/issues/462
-SEARCHABLE_MODELS = [Client, Provider, Doi, Event]
+SEARCHABLE_MODELS = [Client, Provider, Doi, Event, Activity]
 
 RSpec.configure do |config|
   config.around :all, elasticsearch: true do |example|