Initialize repository for synchronizations

config/initializers/repository.rb

@@ -1,7 +1,8 @@
 # encoding: utf-8
+require_relative '../../services/data-repository/backend/sequel'
 require_relative '../../app/models/visualization/collection'
 require_relative '../../app/models/overlay/collection'
-require_relative '../../services/data-repository/backend/sequel'
+require_relative '../../app/models/synchronization/collection'
 
 CartoDB::Visualization.repository ||= 
   DataRepository::Backend::Sequel
@@ -9,4 +10,6 @@ CartoDB::Visualization.repository ||=
 CartoDB::Overlay.repository ||= 
   DataRepository::Backend::Sequel
     .new(Rails::Sequel.connection, :overlays)
-
+CartoDB::Overlay.repository ||= 
+  DataRepository::Backend::Sequel
+    .new(Rails::Sequel.connection, :synchronizations)