Finish migration to the new events setup

This finishes the procedure for migrating events from the old format
into the new format. Code no longer uses the old setup and the database
tables used during the migration process are swapped, with the old table
being dropped.

While the database migration can be reversed this will 1) take a lot of
time as data has to be coped around 2) won't restore data in the
"events.data" column as we have no way of restoring this.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/37241

app/models/event.rb

 class Event < ActiveRecord::Base
   include Sortable
+  include IgnorableColumn
   default_scope { reorder(nil).where.not(author_id: nil) }
 
   CREATED   = 1
@@ -50,13 +51,9 @@ class Event < ActiveRecord::Base
   belongs_to :target, polymorphic: true # rubocop:disable Cop/PolymorphicAssociations
   has_one :push_event_payload, foreign_key: :event_id
 
-  # For Hash only
-  serialize :data # rubocop:disable Cop/ActiveRecordSerialize
-
   # Callbacks
   after_create :reset_project_activity
   after_create :set_last_repository_updated_at, if: :push?
-  after_create :replicate_event_for_push_events_migration
 
   # Scopes
   scope :recent, -> { reorder(id: :desc) }
@@ -82,6 +79,10 @@ class Event < ActiveRecord::Base
 
   self.inheritance_column = 'action'
 
+  # "data" will be removed in 10.0 but it may be possible that JOINs happen that
+  # include this column, hence we're ignoring it as well.
+  ignore_column :data
+
   class << self
     def model_name
       ActiveModel::Name.new(self, nil, 'event')
@@ -159,7 +160,7 @@ class Event < ActiveRecord::Base
   end
 
   def push?
-    action == PUSHED && valid_push?
+    false
   end
 
   def merged?
@@ -272,87 +273,6 @@ class Event < ActiveRecord::Base
     end
   end
 
-  def valid_push?
-    data[:ref] && ref_name.present?
-  rescue
-    false
-  end
-
-  def tag?
-    Gitlab::Git.tag_ref?(data[:ref])
-  end
-
-  def branch?
-    Gitlab::Git.branch_ref?(data[:ref])
-  end
-
-  def new_ref?
-    Gitlab::Git.blank_ref?(commit_from)
-  end
-
-  def rm_ref?
-    Gitlab::Git.blank_ref?(commit_to)
-  end
-
-  def md_ref?
-    !(rm_ref? || new_ref?)
-  end
-
-  def commit_from
-    data[:before]
-  end
-
-  def commit_to
-    data[:after]
-  end
-
-  def ref_name
-    if tag?
-      tag_name
-    else
-      branch_name
-    end
-  end
-
-  def branch_name
-    @branch_name ||= Gitlab::Git.ref_name(data[:ref])
-  end
-
-  def tag_name
-    @tag_name ||= Gitlab::Git.ref_name(data[:ref])
-  end
-
-  # Max 20 commits from push DESC
-  def commits
-    @commits ||= (data[:commits] || []).reverse
-  end
-
-  def commit_title
-    commit = commits.last
-
-    commit[:message] if commit
-  end
-
-  def commit_id
-    commit_to || commit_from
-  end
-
-  def commits_count
-    data[:total_commits_count] || commits.count || 0
-  end
-
-  def ref_type
-    tag? ? "tag" : "branch"
-  end
-
-  def push_with_commits?
-    !commits.empty? && commit_from && commit_to
-  end
-
-  def last_push_to_non_root?
-    branch? && project.default_branch != branch_name
-  end
-
   def target_iid
     target.respond_to?(:iid) ? target.iid : target_id
   end
@@ -432,16 +352,6 @@ class Event < ActiveRecord::Base
     user ? author_id == user.id : false
   end
 
-  # We're manually replicating data into the new table since database triggers
-  # are not dumped to db/schema.rb. This could mean that a new installation
-  # would not have the triggers in place, thus losing events data in GitLab
-  # 10.0.
-  def replicate_event_for_push_events_migration
-    new_attributes = attributes.with_indifferent_access.except(:title, :data)
-
-    EventForMigration.create!(new_attributes)
-  end
-
   def to_partial_path
     # We are intentionally using `Event` rather than `self.class` so that
     # subclasses also use the `Event` implementation.

app/models/event_for_migration.rb

-# This model is used to replicate events between the old "events" table and the
-# new "events_for_migration" table that will replace "events" in GitLab 10.0.
-class EventForMigration < ActiveRecord::Base
-  self.table_name = 'events_for_migration'
-end

app/models/push_event.rb

@@ -15,15 +15,21 @@ class PushEvent < Event
   # should ensure the ID points to a valid project.
   validates :project_id, presence: true
 
-  # The "data" field must not be set for push events since it's not used and a
-  # waste of space.
-  validates :data, absence: true
-
   # These fields are also not used for push events, thus storing them would be a
   # waste.
   validates :target_id, absence: true
   validates :target_type, absence: true
 
+  delegate :branch?, to: :push_event_payload
+  delegate :tag?, to: :push_event_payload
+  delegate :commit_from, to: :push_event_payload
+  delegate :commit_to, to: :push_event_payload
+  delegate :ref_type, to: :push_event_payload
+  delegate :commit_title, to: :push_event_payload
+
+  delegate :commit_count, to: :push_event_payload
+  alias_method :commits_count, :commit_count
+
   def self.sti_name
     PUSHED
   end
@@ -36,86 +42,35 @@ class PushEvent < Event
     !!(commit_from && commit_to)
   end
 
-  def tag?
-    return super unless push_event_payload
-
-    push_event_payload.tag?
-  end
-
-  def branch?
-    return super unless push_event_payload
-
-    push_event_payload.branch?
-  end
-
   def valid_push?
-    return super unless push_event_payload
-
     push_event_payload.ref.present?
   end
 
   def new_ref?
-    return super unless push_event_payload
-
     push_event_payload.created?
   end
 
   def rm_ref?
-    return super unless push_event_payload
-
     push_event_payload.removed?
   end
 
-  def commit_from
-    return super unless push_event_payload
-
-    push_event_payload.commit_from
-  end
-
-  def commit_to
-    return super unless push_event_payload
-
-    push_event_payload.commit_to
+  def md_ref?
+    !(rm_ref? || new_ref?)
   end
 
   def ref_name
-    return super unless push_event_payload
-
     push_event_payload.ref
   end
 
-  def ref_type
-    return super unless push_event_payload
-
-    push_event_payload.ref_type
-  end
-
-  def branch_name
-    return super unless push_event_payload
-
-    ref_name
-  end
-
-  def tag_name
-    return super unless push_event_payload
-
-    ref_name
-  end
-
-  def commit_title
-    return super unless push_event_payload
-
-    push_event_payload.commit_title
-  end
+  alias_method :branch_name, :ref_name
+  alias_method :tag_name, :ref_name
 
   def commit_id
     commit_to || commit_from
   end
 
-  def commits_count
-    return super unless push_event_payload
-
-    push_event_payload.commit_count
+  def last_push_to_non_root?
+    branch? && project.default_branch != branch_name
   end
 
   def validate_push_action

changelogs/unreleased/events-migration-cleanup.yml

+---
+title: Finish migration to the new events setup
+merge_request:
+author:
+type: changed

db/migrate/20170830130119_steal_remaining_event_migration_jobs.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class StealRemainingEventMigrationJobs < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    Gitlab::BackgroundMigration.steal('MigrateEventsToPushEventPayloads')
+  end
+
+  def down
+  end
+end

db/migrate/20170830131015_swap_event_migration_tables.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class SwapEventMigrationTables < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  def up
+    rename_tables
+  end
+
+  def down
+    rename_tables
+  end
+
+  def rename_tables
+    rename_table :events, :events_old
+    rename_table :events_for_migration, :events
+    rename_table :events_old, :events_for_migration
+  end
+end

db/migrate/limits_to_mysql.rb

@@ -7,6 +7,5 @@ class LimitsToMysql < ActiveRecord::Migration
     change_column :merge_request_diffs, :st_diffs, :text, limit: 2147483647
     change_column :snippets, :content, :text, limit: 2147483647
     change_column :notes, :st_diff, :text, limit: 2147483647
-    change_column :events, :data, :text, limit: 2147483647
   end
 end

db/post_migrate/20170830150306_drop_events_for_migration_table.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class DropEventsForMigrationTable < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  class Event < ActiveRecord::Base
+    include EachBatch
+  end
+
+  def up
+    transaction do
+      drop_table :events_for_migration
+    end
+  end
+
+  # rubocop: disable Migration/Datetime
+  def down
+    create_table :events_for_migration do |t|
+      t.string :target_type, index: true
+      t.integer :target_id, index: true
+      t.string :title
+      t.text :data
+      t.integer :project_id
+      t.datetime :created_at, index: true
+      t.datetime :updated_at
+      t.integer :action, index: true
+      t.integer :author_id, index: true
+
+      t.index [:project_id, :id]
+    end
+
+    Event.all.each_batch do |relation|
+      start_id, stop_id = relation.pluck('MIN(id), MAX(id)').first
+
+      execute <<-EOF.strip_heredoc
+      INSERT INTO events_for_migration (target_type, target_id, project_id, created_at, updated_at, action, author_id)
+      SELECT target_type, target_id, project_id, created_at, updated_at, action, author_id
+      FROM events
+      WHERE id BETWEEN #{start_id} AND #{stop_id}
+      EOF
+    end
+  end
+end

db/schema.rb

@@ -531,25 +531,6 @@ ActiveRecord::Schema.define(version: 20170901071411) do
   add_index "environments", ["project_id", "slug"], name: "index_environments_on_project_id_and_slug", unique: true, using: :btree
 
   create_table "events", force: :cascade do |t|
-    t.string "target_type"
-    t.integer "target_id"
-    t.string "title"
-    t.text "data"
-    t.integer "project_id"
-    t.datetime "created_at"
-    t.datetime "updated_at"
-    t.integer "action"
-    t.integer "author_id"
-  end
-
-  add_index "events", ["action"], name: "index_events_on_action", using: :btree
-  add_index "events", ["author_id"], name: "index_events_on_author_id", using: :btree
-  add_index "events", ["created_at"], name: "index_events_on_created_at", using: :btree
-  add_index "events", ["project_id", "id"], name: "index_events_on_project_id_and_id", using: :btree
-  add_index "events", ["target_id"], name: "index_events_on_target_id", using: :btree
-  add_index "events", ["target_type"], name: "index_events_on_target_type", using: :btree
-
-  create_table "events_for_migration", force: :cascade do |t|
     t.integer "project_id"
     t.integer "author_id", null: false
     t.integer "target_id"
@@ -559,10 +540,10 @@ ActiveRecord::Schema.define(version: 20170901071411) do
     t.string "target_type"
   end
 
-  add_index "events_for_migration", ["action"], name: "index_events_for_migration_on_action", using: :btree
-  add_index "events_for_migration", ["author_id"], name: "index_events_for_migration_on_author_id", using: :btree
-  add_index "events_for_migration", ["project_id", "id"], name: "index_events_for_migration_on_project_id_and_id", using: :btree
-  add_index "events_for_migration", ["target_type", "target_id"], name: "index_events_for_migration_on_target_type_and_target_id", using: :btree
+  add_index "events", ["action"], name: "index_events_on_action", using: :btree
+  add_index "events", ["author_id"], name: "index_events_on_author_id", using: :btree
+  add_index "events", ["project_id", "id"], name: "index_events_on_project_id_and_id", using: :btree
+  add_index "events", ["target_type", "target_id"], name: "index_events_on_target_type_and_target_id", using: :btree
 
   create_table "feature_gates", force: :cascade do |t|
     t.string "feature_key", null: false
@@ -1697,9 +1678,8 @@ ActiveRecord::Schema.define(version: 20170901071411) do
   add_foreign_key "deploy_keys_projects", "projects", name: "fk_58a901ca7e", on_delete: :cascade
   add_foreign_key "deployments", "projects", name: "fk_b9a3851b82", on_delete: :cascade
   add_foreign_key "environments", "projects", name: "fk_d1c8c1da6a", on_delete: :cascade
-  add_foreign_key "events", "projects", name: "fk_0434b48643", on_delete: :cascade
-  add_foreign_key "events_for_migration", "projects", on_delete: :cascade
-  add_foreign_key "events_for_migration", "users", column: "author_id", name: "fk_edfd187b6f", on_delete: :cascade
+  add_foreign_key "events", "projects", on_delete: :cascade
+  add_foreign_key "events", "users", column: "author_id", name: "fk_edfd187b6f", on_delete: :cascade
   add_foreign_key "forked_project_links", "projects", column: "forked_to_project_id", name: "fk_434510edb0", on_delete: :cascade
   add_foreign_key "gpg_keys", "users", on_delete: :cascade
   add_foreign_key "gpg_signatures", "gpg_keys", on_delete: :nullify
@@ -1743,7 +1723,7 @@ ActiveRecord::Schema.define(version: 20170901071411) do
   add_foreign_key "protected_tag_create_access_levels", "protected_tags", name: "fk_f7dfda8c51", on_delete: :cascade
   add_foreign_key "protected_tag_create_access_levels", "users"
   add_foreign_key "protected_tags", "projects", name: "fk_8e4af87648", on_delete: :cascade
-  add_foreign_key "push_event_payloads", "events_for_migration", column: "event_id", name: "fk_36c74129da", on_delete: :cascade
+  add_foreign_key "push_event_payloads", "events", name: "fk_36c74129da", on_delete: :cascade
   add_foreign_key "releases", "projects", name: "fk_47fe2a0596", on_delete: :cascade
   add_foreign_key "services", "projects", name: "fk_71cce407f9", on_delete: :cascade
   add_foreign_key "snippets", "projects", name: "fk_be41fd4bb7", on_delete: :cascade

doc/user/project/settings/import_export.md

@@ -29,8 +29,9 @@ with all their related data and be moved into a new GitLab instance.
 ## Version history
 
 | GitLab version   | Import/Export version |
-| -------- | -------- |
-| 9.4.0 to current | 0.1.8 |
+| ---------------- | --------------------- |
+| 10.0 to current  | 0.2.0                 |
+| 9.4.0            | 0.1.8                 |
 | 9.2.0            | 0.1.7                 |
 | 8.17.0           | 0.1.6                 |
 | 8.13.0           | 0.1.5                 |

features/steps/user.rb

@@ -17,14 +17,9 @@ class Spinach::Features::User < Spinach::FeatureSteps
     Issues::CreateService.new(project, user, issue_params).execute
 
     # Push code contribution
-    push_params = {
-      project: project,
-      action: Event::PUSHED,
-      author_id: user.id,
-      data: { commit_count: 3 }
-    }
-
-    Event.create(push_params)
+    event = create(:push_event, project: project, author: user)
+
+    create(:push_event_payload, event: event, commit_count: 3)
   end
 
   step 'I should see contributed projects' do
@@ -38,6 +33,6 @@ class Spinach::Features::User < Spinach::FeatureSteps
   end
 
   def contributed_project
-    @contributed_project ||= create(:project, :public)
+    @contributed_project ||= create(:project, :public, :empty_repo)
   end
 end

lib/api/entities.rb

@@ -545,7 +545,7 @@ module API
     end
 
     class Event < Grape::Entity
-      expose :title, :project_id, :action_name
+      expose :project_id, :action_name
       expose :target_id, :target_iid, :target_type, :author_id
       expose :target_title
       expose :created_at

lib/api/v3/entities.rb

@@ -31,7 +31,7 @@ module API
       end
 
       class Event < Grape::Entity
-        expose :title, :project_id, :action_name
+        expose :project_id, :action_name
         expose :target_id, :target_type, :author_id
         expose :target_title
         expose :created_at

lib/gitlab/import_export.rb

@@ -3,7 +3,7 @@ module Gitlab
     extend self
 
     # For every version update, the version history in import_export.md has to be kept up to date.
-    VERSION = '0.1.8'.freeze
+    VERSION = '0.2.0'.freeze
     FILENAME_LIMIT = 50
 
     def export_path(relative_path:)

lib/gitlab/import_export/relation_factory.rb

@@ -69,7 +69,6 @@ module Gitlab
         reset_tokens!
         remove_encrypted_attributes!
 
-        @relation_hash['data'].deep_symbolize_keys! if @relation_name == :events && @relation_hash['data']
         set_st_diff_commits if @relation_name == :merge_request_diff
         set_diff if @relation_name == :merge_request_diff_files
       end

lib/tasks/gitlab/import_export.rake

@@ -9,5 +9,16 @@ namespace :gitlab do
     task data: :environment do
       puts YAML.load_file(Gitlab::ImportExport.config_file)['project_tree'].to_yaml(SortKeys: true)
     end
+
+    desc 'GitLab | Bumps the Import/Export version for test_project_export.tar.gz'
+    task bump_test_version: :environment do
+      Dir.mktmpdir do |tmp_dir|
+        system("tar -zxf spec/features/projects/import_export/test_project_export.tar.gz -C #{tmp_dir} > /dev/null")
+        File.write(File.join(tmp_dir, 'VERSION'), Gitlab::ImportExport.version, mode: 'w')
+        system("tar -zcvf spec/features/projects/import_export/test_project_export.tar.gz -C #{tmp_dir} . > /dev/null")
+      end
+
+      puts "Updated to #{Gitlab::ImportExport.version}"
+    end
   end
 end

spec/features/dashboard/projects_spec.rb

@@ -84,25 +84,11 @@ feature 'Dashboard Projects' do
   end
 
   context 'last push widget' do
-    let(:push_event_data) do
-      {
-        before: Gitlab::Git::BLANK_SHA,
-        after: '0220c11b9a3e6c69dc8fd35321254ca9a7b98f7e',
-        ref: 'refs/heads/feature',
-        user_id: user.id,
-        user_name: user.name,
-        repository: {
-          name: project.name,
-          url: 'localhost/rubinius',
-          description: '',
-          homepage: 'localhost/rubinius',
-          private: true
-        }
-      }
-    end
-    let!(:push_event) { create(:event, :pushed, data: push_event_data, project: project, author: user) }
-
     before do
+      event = create(:push_event, project: project, author: user)
+
+      create(:push_event_payload, event: event, ref: 'feature', action: :created)
+
       visit dashboard_projects_path
     end
 

spec/lib/gitlab/background_migration/migrate_events_to_push_event_payloads_spec.rb

 require 'spec_helper'
 
-describe Gitlab::BackgroundMigration::MigrateEventsToPushEventPayloads::Event do
+describe Gitlab::BackgroundMigration::MigrateEventsToPushEventPayloads::Event, :migration, schema: 20170608152748 do
   describe '#commit_title' do
     it 'returns nil when there are no commits' do
       expect(described_class.new.commit_title).to be_nil

spec/lib/gitlab/import_export/project.json

@@ -75,8 +75,6 @@
             "id": 487,
             "target_type": "Milestone",
             "target_id": 1,
-            "title": null,
-            "data": null,
             "project_id": 46,
             "created_at": "2016-06-14T15:02:04.418Z",
             "updated_at": "2016-06-14T15:02:04.418Z",
@@ -364,8 +362,6 @@
             "id": 487,
             "target_type": "Milestone",
             "target_id": 1,
-            "title": null,
-            "data": null,
             "project_id": 46,
             "created_at": "2016-06-14T15:02:04.418Z",
             "updated_at": "2016-06-14T15:02:04.418Z",
@@ -2311,8 +2307,6 @@
           "id": 487,
           "target_type": "Milestone",
           "target_id": 1,
-          "title": null,
-          "data": null,
           "project_id": 46,
           "created_at": "2016-06-14T15:02:04.418Z",
           "updated_at": "2016-06-14T15:02:04.418Z",
@@ -2336,8 +2330,6 @@
           "id": 240,
           "target_type": "Milestone",
           "target_id": 20,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:04.593Z",
           "updated_at": "2016-06-14T15:02:04.593Z",
@@ -2348,8 +2340,6 @@
           "id": 60,
           "target_type": "Milestone",
           "target_id": 20,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:04.593Z",
           "updated_at": "2016-06-14T15:02:04.593Z",
@@ -2373,8 +2363,6 @@
           "id": 241,
           "target_type": "Milestone",
           "target_id": 19,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:04.585Z",
           "updated_at": "2016-06-14T15:02:04.585Z",
@@ -2385,41 +2373,6 @@
           "id": 59,
           "target_type": "Milestone",
           "target_id": 19,
-          "title": null,
-          "data": {
-            "object_kind": "push",
-            "before": "0000000000000000000000000000000000000000",
-            "after": "de990aa15829d0ab182ad5a55b4c527846c0d39c",
-            "ref": "refs/heads/removable-group-owner",
-            "checkout_sha": "de990aa15829d0ab182ad5a55b4c527846c0d39c",
-            "message": null,
-            "user_id": 273486,
-            "user_name": "James Lopez",
-            "user_email": "james@jameslopez.es",
-            "project_id": 562317,
-            "repository": {
-              "name": "GitLab Community Edition",
-              "url": "git@gitlab.com:james11/gitlab-ce.git",
-              "description": "Version Control on your Server. See http://gitlab.org/gitlab-ce/ and the README for more information",
-              "homepage": "https://gitlab.com/james11/gitlab-ce",
-              "git_http_url": "https://gitlab.com/james11/gitlab-ce.git",
-              "git_ssh_url": "git@gitlab.com:james11/gitlab-ce.git",
-              "visibility_level": 20
-            },
-            "commits": [
-              {
-                "id": "de990aa15829d0ab182ad5a55b4c527846c0d39c",
-                "message": "fixed last group owner issue and added test\\n",
-                "timestamp": "2015-10-29T16:10:27+00:00",
-                "url": "https://gitlab.com/james11/gitlab-ce/commit/de990aa15829d0ab182ad5a55b4c527846c0d39c",
-                "author": {
-                  "name": "James Lopez",
-                  "email": "james.lopez@vodafone.com"
-                }
-              }
-            ],
-            "total_commits_count": 1
-          },
           "project_id": 5,
           "created_at": "2016-06-14T15:02:04.585Z",
           "updated_at": "2016-06-14T15:02:04.585Z",
@@ -2947,8 +2900,6 @@
           "id": 221,
           "target_type": "MergeRequest",
           "target_id": 27,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:36.703Z",
           "updated_at": "2016-06-14T15:02:36.703Z",
@@ -2959,8 +2910,6 @@
           "id": 187,
           "target_type": "MergeRequest",
           "target_id": 27,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:36.703Z",
           "updated_at": "2016-06-14T15:02:36.703Z",
@@ -3230,8 +3179,6 @@
           "id": 222,
           "target_type": "MergeRequest",
           "target_id": 26,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:36.496Z",
           "updated_at": "2016-06-14T15:02:36.496Z",
@@ -3242,8 +3189,6 @@
           "id": 186,
           "target_type": "MergeRequest",
           "target_id": 26,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:36.496Z",
           "updated_at": "2016-06-14T15:02:36.496Z",
@@ -3513,8 +3458,6 @@
           "id": 223,
           "target_type": "MergeRequest",
           "target_id": 15,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:25.262Z",
           "updated_at": "2016-06-14T15:02:25.262Z",
@@ -3525,8 +3468,6 @@
           "id": 175,
           "target_type": "MergeRequest",
           "target_id": 15,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:25.262Z",
           "updated_at": "2016-06-14T15:02:25.262Z",
@@ -4202,8 +4143,6 @@
           "id": 224,
           "target_type": "MergeRequest",
           "target_id": 14,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:25.113Z",
           "updated_at": "2016-06-14T15:02:25.113Z",
@@ -4214,8 +4153,6 @@
           "id": 174,
           "target_type": "MergeRequest",
           "target_id": 14,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:25.113Z",
           "updated_at": "2016-06-14T15:02:25.113Z",
@@ -4274,9 +4211,7 @@
             {
               "id": 529,
               "target_type": "Note",
-              "target_id": 2521,
-              "title": "test levels",
-              "data": null,
+              "target_id": 793,
               "project_id": 4,
               "created_at": "2016-07-07T14:35:12.128Z",
               "updated_at": "2016-07-07T14:35:12.128Z",
@@ -4749,8 +4684,6 @@
           "id": 225,
           "target_type": "MergeRequest",
           "target_id": 13,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:24.636Z",
           "updated_at": "2016-06-14T15:02:24.636Z",
@@ -4761,8 +4694,6 @@
           "id": 173,
           "target_type": "MergeRequest",
           "target_id": 13,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:24.636Z",
           "updated_at": "2016-06-14T15:02:24.636Z",
@@ -5247,8 +5178,6 @@
           "id": 226,
           "target_type": "MergeRequest",
           "target_id": 12,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:24.253Z",
           "updated_at": "2016-06-14T15:02:24.253Z",
@@ -5259,8 +5188,6 @@
           "id": 172,
           "target_type": "MergeRequest",
           "target_id": 12,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:24.253Z",
           "updated_at": "2016-06-14T15:02:24.253Z",
@@ -5506,8 +5433,6 @@
           "id": 227,
           "target_type": "MergeRequest",
           "target_id": 11,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:23.865Z",
           "updated_at": "2016-06-14T15:02:23.865Z",
@@ -5518,8 +5443,6 @@
           "id": 171,
           "target_type": "MergeRequest",
           "target_id": 11,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:23.865Z",
           "updated_at": "2016-06-14T15:02:23.865Z",
@@ -6195,8 +6118,6 @@
           "id": 228,
           "target_type": "MergeRequest",
           "target_id": 10,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:23.660Z",
           "updated_at": "2016-06-14T15:02:23.660Z",
@@ -6207,8 +6128,6 @@
           "id": 170,
           "target_type": "MergeRequest",
           "target_id": 10,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:23.660Z",
           "updated_at": "2016-06-14T15:02:23.660Z",
@@ -6478,8 +6397,6 @@
           "id": 229,
           "target_type": "MergeRequest",
           "target_id": 9,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:22.927Z",
           "updated_at": "2016-06-14T15:02:22.927Z",
@@ -6490,8 +6407,6 @@
           "id": 169,
           "target_type": "MergeRequest",
           "target_id": 9,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:22.927Z",
           "updated_at": "2016-06-14T15:02:22.927Z",

spec/lib/gitlab/import_export/project_tree_restorer_spec.rb

@@ -57,10 +57,6 @@ describe Gitlab::ImportExport::ProjectTreeRestorer do
         expect(Ci::Pipeline.where(ref: nil)).not_to be_empty
       end
 
-      it 'restores the correct event with symbolised data' do
-        expect(Event.where.not(data: nil).first.data[:ref]).not_to be_empty
-      end
-
       it 'preserves updated_at on issues' do
         issue = Issue.where(description: 'Aliquam enim illo et possimus.').first
 
@@ -80,7 +76,7 @@ describe Gitlab::ImportExport::ProjectTreeRestorer do
       end
 
       context 'event at forth level of the tree' do
-        let(:event) { Event.where(title: 'test levels').first }
+        let(:event) { Event.where(action: 6).first }
 
         it 'restores the event' do
           expect(event).not_to be_nil

spec/lib/gitlab/import_export/safe_model_attributes.yml

@@ -29,8 +29,6 @@ Event:
 - id
 - target_type
 - target_id
-- title
-- data
 - project_id
 - created_at
 - updated_at

spec/models/event_spec.rb

@@ -11,7 +11,6 @@ describe Event do
     it { is_expected.to respond_to(:author_email) }
     it { is_expected.to respond_to(:issue_title) }
     it { is_expected.to respond_to(:merge_request_title) }
-    it { is_expected.to respond_to(:commits) }
   end
 
   describe 'Callbacks' do