Add Geo::Event model

And its table.

db/migrate/20200121192942_create_geo_events.rb

+# frozen_string_literal: true
+
+class CreateGeoEvents < ActiveRecord::Migration[5.2]
+  DOWNTIME = false
+
+  def change
+    create_table :geo_events do |t|
+      t.string :replicable_name, limit: 255, null: false
+      t.string :event_name, limit: 255, null: false
+      t.jsonb :payload, default: {}, null: false
+      t.datetime_with_timezone :created_at, null: false
+    end
+  end
+end

db/migrate/20200121194000_add_geo_event_id_to_geo_event_log.rb

+# frozen_string_literal: true
+
+class AddGeoEventIdToGeoEventLog < ActiveRecord::Migration[5.2]
+  DOWNTIME = false
+
+  def change
+    add_column :geo_event_log, :geo_event_id, :integer
+  end
+end

db/migrate/20200121194048_add_geo_event_id_index_to_geo_event_log.rb

+# frozen_string_literal: true
+
+class AddGeoEventIdIndexToGeoEventLog < ActiveRecord::Migration[5.2]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :geo_event_log, :geo_event_id,
+                         where: "(geo_event_id IS NOT NULL)",
+                         using: :btree,
+                         name: 'index_geo_event_log_on_geo_event_id'
+  end
+
+  def down
+    remove_concurrent_index :geo_event_log, :geo_event_id, name: 'index_geo_event_log_on_geo_event_id'
+  end
+end

db/migrate/20200121194154_add_geo_events_foreign_key.rb

+# frozen_string_literal: true
+
+class AddGeoEventsForeignKey < ActiveRecord::Migration[5.2]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_foreign_key :geo_event_log, :geo_events,
+                               column: :geo_event_id,
+                               name: 'fk_geo_event_log_on_geo_event_id',
+                               on_delete: :cascade
+  end
+
+  def down
+    remove_foreign_key_without_error :geo_event_log, column: :geo_event_id, name: 'fk_geo_event_log_on_geo_event_id'
+  end
+end

db/schema.rb

@@ -1665,8 +1665,10 @@ ActiveRecord::Schema.define(version: 2020_02_03_025821) do
     t.bigint "reset_checksum_event_id"
     t.bigint "cache_invalidation_event_id"
     t.bigint "container_repository_updated_event_id"
+    t.integer "geo_event_id"
     t.index ["cache_invalidation_event_id"], name: "index_geo_event_log_on_cache_invalidation_event_id", where: "(cache_invalidation_event_id IS NOT NULL)"
     t.index ["container_repository_updated_event_id"], name: "index_geo_event_log_on_container_repository_updated_event_id"
+    t.index ["geo_event_id"], name: "index_geo_event_log_on_geo_event_id", where: "(geo_event_id IS NOT NULL)"
     t.index ["hashed_storage_attachments_event_id"], name: "index_geo_event_log_on_hashed_storage_attachments_event_id", where: "(hashed_storage_attachments_event_id IS NOT NULL)"
     t.index ["hashed_storage_migrated_event_id"], name: "index_geo_event_log_on_hashed_storage_migrated_event_id", where: "(hashed_storage_migrated_event_id IS NOT NULL)"
     t.index ["job_artifact_deleted_event_id"], name: "index_geo_event_log_on_job_artifact_deleted_event_id", where: "(job_artifact_deleted_event_id IS NOT NULL)"
@@ -1680,6 +1682,13 @@ ActiveRecord::Schema.define(version: 2020_02_03_025821) do
     t.index ["upload_deleted_event_id"], name: "index_geo_event_log_on_upload_deleted_event_id", where: "(upload_deleted_event_id IS NOT NULL)"
   end
 
+  create_table "geo_events", force: :cascade do |t|
+    t.string "replicable_name", limit: 255, null: false
+    t.string "event_name", limit: 255, null: false
+    t.jsonb "payload", default: {}, null: false
+    t.datetime_with_timezone "created_at", null: false
+  end
+
   create_table "geo_hashed_storage_attachments_events", force: :cascade do |t|
     t.integer "project_id", null: false
     t.text "old_attachments_path", null: false
@@ -4620,6 +4629,7 @@ ActiveRecord::Schema.define(version: 2020_02_03_025821) do
   add_foreign_key "geo_container_repository_updated_events", "container_repositories", name: "fk_212c89c706", on_delete: :cascade
   add_foreign_key "geo_event_log", "geo_cache_invalidation_events", column: "cache_invalidation_event_id", name: "fk_42c3b54bed", on_delete: :cascade
   add_foreign_key "geo_event_log", "geo_container_repository_updated_events", column: "container_repository_updated_event_id", name: "fk_6ada82d42a", on_delete: :cascade
+  add_foreign_key "geo_event_log", "geo_events", name: "fk_geo_event_log_on_geo_event_id", on_delete: :cascade
   add_foreign_key "geo_event_log", "geo_hashed_storage_migrated_events", column: "hashed_storage_migrated_event_id", name: "fk_27548c6db3", on_delete: :cascade
   add_foreign_key "geo_event_log", "geo_job_artifact_deleted_events", column: "job_artifact_deleted_event_id", name: "fk_176d3fbb5d", on_delete: :cascade
   add_foreign_key "geo_event_log", "geo_lfs_object_deleted_events", column: "lfs_object_deleted_event_id", name: "fk_d5af95fcd9", on_delete: :cascade

ee/app/models/geo/event.rb

+# frozen_string_literal: true
+
+module Geo
+  class Event < ApplicationRecord
+    include Geo::Model
+    include Geo::Eventable
+
+    has_one :geo_event_log, class_name: 'Geo::EventLog', foreign_key: :geo_event_id
+  end
+end

ee/app/models/geo/event_log.rb

@@ -17,7 +17,8 @@ module Geo
                        Geo::LfsObjectDeletedEvent
                        Geo::JobArtifactDeletedEvent
                        Geo::UploadDeletedEvent
-                       Geo::ContainerRepositoryUpdatedEvent].freeze
+                       Geo::ContainerRepositoryUpdatedEvent
+                       Geo::Event].freeze
 
     belongs_to :cache_invalidation_event,
       class_name: 'Geo::CacheInvalidationEvent',
@@ -71,6 +72,10 @@ module Geo
       class_name: 'Geo::ContainerRepositoryUpdatedEvent',
       foreign_key: :container_repository_updated_event_id
 
+    belongs_to :event,
+      class_name: 'Geo::Event',
+      foreign_key: :geo_event_id
+
     def self.latest_event
       order(id: :desc).first
     end

ee/spec/models/geo/every_geo_event_spec.rb

@@ -18,7 +18,7 @@ describe 'Every Geo event' do
     geo   = root.join('geo')
 
     events = Dir[geo.join('**', '*.rb')]
-      .select { |path| path.end_with?('_event.rb') }
+      .select { |path| path.end_with?('event.rb') }
 
     events.map! do |path|
       ns = Pathname.new(path).relative_path_from(root).to_s.gsub('.rb', '')