diff --git a/Gemfile b/Gemfile
index 4dd59eabf..e93041609 100644
--- a/Gemfile
+++ b/Gemfile
@@ -69,8 +69,7 @@ gem "sprockets", "~> 3.7", ">= 3.7.2"
 gem 'uuid', '~> 2.3', '>= 2.3.9'
 gem 'strong_migrations', '~> 0.6.0'
 gem 'crawler_detect'
-
-
+gem 'lhm', '~> 2.2'
 
 group :development, :test do
   gem "rspec-rails", "~> 3.8", ">= 3.8.2"
diff --git a/Gemfile.lock b/Gemfile.lock
index f4f82ec9f..7ae6a9476 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -59,7 +59,7 @@ GEM
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
     ansi (1.5.0)
-    apollo-federation (1.0.0)
+    apollo-federation (1.0.1)
       google-protobuf (~> 3.7)
       graphql (~> 1.9.8)
     arel (9.0.0)
@@ -139,7 +139,7 @@ GEM
     builder (3.2.4)
     byebug (11.1.1)
     cancancan (2.3.0)
-    capybara (3.30.0)
+    capybara (3.31.0)
       addressable
       mini_mime (>= 0.1.3)
       nokogiri (~> 1.8)
@@ -170,6 +170,7 @@ GEM
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
     crass (1.0.6)
+    crawler_detect (0.1.11)
     csl (1.5.1)
       namae (~> 1.0)
     csl-styles (1.0.1.10)
@@ -177,7 +178,7 @@ GEM
     css_parser (1.7.1)
       addressable
     dalli (2.7.10)
-    database_cleaner (1.7.0)
+    database_cleaner (1.8.1)
     debug_inspector (0.0.3)
     diff-lcs (1.3)
     diffy (3.3.0)
@@ -241,7 +242,7 @@ GEM
     globalid (0.4.2)
       activesupport (>= 4.2.0)
     google-protobuf (3.10.0.rc.1)
-    graphql (1.9.18)
+    graphql (1.9.19)
     graphql-batch (0.4.2)
       graphql (>= 1.3, < 2)
       promise.rb (~> 0.7.2)
@@ -280,19 +281,20 @@ GEM
       oj (~> 3)
       optimist (~> 3)
     jwt (2.2.1)
-    kaminari (1.1.1)
+    kaminari (1.2.0)
       activesupport (>= 4.1.0)
-      kaminari-actionview (= 1.1.1)
-      kaminari-activerecord (= 1.1.1)
-      kaminari-core (= 1.1.1)
-    kaminari-actionview (1.1.1)
+      kaminari-actionview (= 1.2.0)
+      kaminari-activerecord (= 1.2.0)
+      kaminari-core (= 1.2.0)
+    kaminari-actionview (1.2.0)
       actionview
-      kaminari-core (= 1.1.1)
-    kaminari-activerecord (1.1.1)
+      kaminari-core (= 1.2.0)
+    kaminari-activerecord (1.2.0)
       activerecord
-      kaminari-core (= 1.1.1)
-    kaminari-core (1.1.1)
+      kaminari-core (= 1.2.0)
+    kaminari-core (1.2.0)
     latex-decode (0.3.1)
+    lhm (2.2.0)
     link_header (0.0.8)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -332,7 +334,7 @@ GEM
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.1009)
-    mimemagic (0.3.3)
+    mimemagic (0.3.4)
     mini_magick (4.10.1)
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
@@ -348,7 +350,7 @@ GEM
     nio4r (2.5.2)
     nokogiri (1.10.7)
       mini_portile2 (~> 2.4.0)
-    oj (3.10.1)
+    oj (3.10.2)
     oj_mimic_json (1.0.1)
     optimist (3.0.0)
     pandoc-ruby (2.0.2)
@@ -368,7 +370,7 @@ GEM
     pwqgen.rb (0.1.0)
       docopt (~> 0.5)
       sysrandom
-    rack (2.1.1)
+    rack (2.1.2)
     rack-accept (0.4.5)
       rack (>= 0.4)
     rack-cors (1.1.1)
@@ -513,7 +515,7 @@ GEM
       regexp_parser (~> 1.3, >= 1.3.0)
     strip_attributes (1.9.0)
       activemodel (>= 3.0, < 7.0)
-    strong_migrations (0.6.0)
+    strong_migrations (0.6.1)
       activerecord (>= 5)
     sxp (1.1.0)
       rdf (~> 3.1)
@@ -573,6 +575,7 @@ DEPENDENCIES
   commonmarker (~> 0.17.9)
   countries (~> 2.1, >= 2.1.2)
   country_select (~> 3.1)
+  crawler_detect
   dalli (~> 2.7, >= 2.7.6)
   database_cleaner
   diffy (~> 3.2, >= 3.2.1)
@@ -602,6 +605,7 @@ DEPENDENCIES
   jsonlint (~> 0.3.0)
   jwt
   kaminari (~> 1.0, >= 1.0.1)
+  lhm (~> 2.2)
   listen (>= 3.0.5, < 3.2)
   lograge (~> 0.11.2)
   logstash-event (~> 1.2, >= 1.2.02)
diff --git a/db/migrate/20200131180609_add_events_properties.rb b/db/migrate/20200131180609_add_events_properties.rb
index 26805d225..53aaaa382 100644
--- a/db/migrate/20200131180609_add_events_properties.rb
+++ b/db/migrate/20200131180609_add_events_properties.rb
@@ -1,12 +1,27 @@
 # frozen_string_literal: true
 
+require 'lhm'
+
 class AddEventsProperties < ActiveRecord::Migration[5.2]
-  def change
-    add_column :events, :source_doi, :text
-    add_column :events, :target_doi, :text
-    add_column :events, :source_relation_type_id, :string, limit: 191
-    add_column :events, :target_relation_type_id, :string, limit: 191
-    add_index :events, [:source_doi, :source_relation_type_id], name: "index_events_on_source_doi", length: { source_doi: 100, source_relation_type_id: 191 }
-    add_index :events, [:target_doi, :target_relation_type_id], name: "index_events_on_target_doi", length: { target_doi: 100, target_relation_type_id: 191 }
+  def up
+    Lhm.change_table :events do |m|
+      m.add_column :source_doi, "TEXT"
+      m.add_column :target_doi, "TEXT"
+      m.add_column :source_relation_type_id, "VARCHAR(191)"
+      m.add_column :target_relation_type_id, "VARCHAR(191)"
+      m.add_index ["source_doi(100)", "source_relation_type_id(191)"], :index_events_on_source_doi
+      m.add_index ["target_doi(100)", "target_relation_type_id(191)"], :index_events_on_target_doi
+    end
+  end
+
+  def down
+    Lhm.change_table :events do |m|
+      m.remove_column :source_doi
+      m.remove_column :target_doi
+      m.remove_column :source_relation_type_id
+      m.remove_column :target_relation_type_id
+      m.remove_index ["source_doi(100)", "source_relation_type_id(191)"], :index_events_on_source_doi
+      m.remove_index ["target_doi(100)", "target_relation_type_id(191)"], :index_events_on_target_doi
+    end
   end
 end