Add option to auto-delete old statuses

Fix #1295

app/models/deletion_schedule.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+# == Schema Information
+#
+# Table name: deletion_schedules
+#
+#  id         :bigint(8)        not null, primary key
+#  user_id    :bigint(8)
+#  delay      :integer          default(604800), not null
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+
+class DeletionSchedule < ApplicationRecord
+  belongs_to :user
+
+  validates :delay, presence: true, numericality: { only_integer: true, greater_than: 7.days.seconds }
+end

app/models/user.rb

@@ -70,6 +70,7 @@ class User < ApplicationRecord
 
   has_many :applications, class_name: 'Doorkeeper::Application', as: :owner
   has_many :backups, inverse_of: :user
+  has_one :deletion_schedule, dependent: :destroy
 
   validates :locale, inclusion: I18n.available_locales.map(&:to_s), if: :locale?
   validates_with BlacklistedEmailValidator, if: :email_changed?

app/workers/deletion_schedule_worker.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class DeletionScheduleWorker
+  include Sidekiq::Worker
+
+  sidekiq_options unique: :until_executed, retry: 0
+
+  def perform(account_id, delay)
+    RemovalWorker.push_bulk(status_ids(account_id, snowflake_at(Time.now.utc - delay.seconds)))
+  end
+
+  private
+
+  def snowflake_at(time)
+    Mastodon::Snowflake.id_at(time)
+  end
+
+  def status_ids(account_id, cut_off_id)
+    Status.where(account_id: account_id)
+          .where(Status.arel_table[:id].lt(cut_off_id))
+          .reorder(id: :asc)
+          .limit(100)
+          .pluck(:id)
+  end
+end

app/workers/scheduler/deletion_scheduler.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class Scheduler::DeletionScheduler
+  include Sidekiq::Worker
+
+  sidekiq_options unique: :until_executed, retry: 0
+
+  def perform
+    DeletionSchedule.includes(:user).find_in_batches do |schedules|
+      DeletionScheduleWorker.push_bulk(schedules) do |schedule|
+        [schedule.user.account_id, schedule.delay]
+      end
+    end
+  end
+end

config/sidekiq.yml

@@ -36,3 +36,6 @@
   pghero_scheduler:
     cron: '0 0 * * *'
     class: Scheduler::PgheroScheduler
+  deletion_scheduler:
+    cron: '<%= Random.rand(0..59) %> <%= Random.rand(0..23) %> * * *'
+    class: Scheduler::DeletionScheduler

db/migrate/20181127224209_create_deletion_schedules.rb

@@ -0,0 +1,10 @@
+class CreateDeletionSchedules < ActiveRecord::Migration[5.2]
+  def change
+    create_table :deletion_schedules do |t|
+      t.belongs_to :user, foreign_key: { on_delete: :cascade }
+      t.integer :delay, null: false, default: 7.days.seconds
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2018_11_27_130500) do
+ActiveRecord::Schema.define(version: 2018_11_27_224209) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -187,6 +187,14 @@ ActiveRecord::Schema.define(version: 2018_11_27_130500) do
     t.index ["account_id"], name: "index_custom_filters_on_account_id"
   end
 
+  create_table "deletion_schedules", force: :cascade do |t|
+    t.bigint "user_id"
+    t.integer "delay", default: 604800, null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["user_id"], name: "index_deletion_schedules_on_user_id"
+  end
+
   create_table "domain_blocks", force: :cascade do |t|
     t.string "domain", default: "", null: false
     t.datetime "created_at", null: false
@@ -645,6 +653,7 @@ ActiveRecord::Schema.define(version: 2018_11_27_130500) do
   add_foreign_key "conversation_mutes", "accounts", name: "fk_225b4212bb", on_delete: :cascade
   add_foreign_key "conversation_mutes", "conversations", on_delete: :cascade
   add_foreign_key "custom_filters", "accounts", on_delete: :cascade
+  add_foreign_key "deletion_schedules", "users", on_delete: :cascade
   add_foreign_key "favourites", "accounts", name: "fk_5eb6c2b873", on_delete: :cascade
   add_foreign_key "favourites", "statuses", name: "fk_b0e856845e", on_delete: :cascade
   add_foreign_key "follow_requests", "accounts", column: "target_account_id", name: "fk_9291ec025d", on_delete: :cascade

spec/fabricators/deletion_schedule_fabricator.rb

@@ -0,0 +1,4 @@
+Fabricator(:deletion_schedule) do
+  user
+  delay 30.days.seconds
+end

spec/models/deletion_schedule_spec.rb

@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe DeletionSchedule, type: :model do
+
+end