Add Geo::RepositoriesChangedEvent model

app/models/geo/repositories_changed_event.rb

+module Geo
+  class RepositoriesChangedEvent < ActiveRecord::Base
+    include Geo::Model
+
+    belongs_to :geo_node
+
+    validates :geo_node, presence: true
+  end
+end

db/migrate/20170801200418_geo_repositories_changed_events.rb

+class GeoRepositoriesChangedEvents < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def change
+    create_table :geo_repositories_changed_events, id: :bigserial do |t|
+      t.references :geo_node, index: true, foreign_key: { on_delete: :cascade }, null: false
+    end
+
+    add_column :geo_event_log, :repositories_changed_event_id, :integer, limit: 8
+  end
+end

db/schema.rb

@@ -629,6 +629,7 @@ ActiveRecord::Schema.define(version: 20170803130232) do
     t.integer "repository_updated_event_id", limit: 8
     t.integer "repository_deleted_event_id", limit: 8
     t.integer "repository_renamed_event_id", limit: 8
+    t.integer "repositories_changed_event_id", limit: 8
   end
 
   add_index "geo_event_log", ["repository_updated_event_id"], name: "index_geo_event_log_on_repository_updated_event_id", using: :btree
@@ -663,6 +664,12 @@ ActiveRecord::Schema.define(version: 20170803130232) do
   add_index "geo_nodes", ["host"], name: "index_geo_nodes_on_host", using: :btree
   add_index "geo_nodes", ["primary"], name: "index_geo_nodes_on_primary", using: :btree
 
+  create_table "geo_repositories_changed_events", id: :bigserial, force: :cascade do |t|
+    t.integer "geo_node_id", null: false
+  end
+
+  add_index "geo_repositories_changed_events", ["geo_node_id"], name: "index_geo_repositories_changed_events_on_geo_node_id", using: :btree
+
   create_table "geo_repository_deleted_events", id: :bigserial, force: :cascade do |t|
     t.integer "project_id", null: false
     t.text "repository_storage_name", null: false
@@ -1986,6 +1993,7 @@ ActiveRecord::Schema.define(version: 20170803130232) do
   add_foreign_key "geo_event_log", "geo_repository_updated_events", column: "repository_updated_event_id", on_delete: :cascade
   add_foreign_key "geo_node_namespace_links", "geo_nodes", on_delete: :cascade
   add_foreign_key "geo_node_namespace_links", "namespaces", name: "fk_41ff5fb854", on_delete: :cascade
+  add_foreign_key "geo_repositories_changed_events", "geo_nodes", on_delete: :cascade
   add_foreign_key "geo_repository_renamed_events", "projects", on_delete: :cascade
   add_foreign_key "geo_repository_updated_events", "projects", on_delete: :cascade
   add_foreign_key "index_statuses", "projects", name: "fk_74b2492545", on_delete: :cascade

spec/models/geo/repositories_changed_event_spec.rb

+require 'spec_helper'
+
+describe Geo::RepositoriesChangedEvent, type: :model do
+  describe 'relationships' do
+    it { is_expected.to belong_to(:geo_node) }
+  end
+
+  describe 'validations' do
+    it { is_expected.to validate_presence_of(:geo_node) }
+  end
+end