Add moderation note (#5240)

* Add moderation note

* Add frozen_string_literal

* Make rspec pass

app/models/account.rb

@@ -90,6 +90,10 @@ class Account < ApplicationRecord
   has_many :reports
   has_many :targeted_reports, class_name: 'Report', foreign_key: :target_account_id
 
+  # Moderation notes
+  has_many :account_moderation_notes
+  has_many :targeted_moderation_notes, class_name: 'AccountModerationNote', foreign_key: :target_account_id
+
   scope :remote, -> { where.not(domain: nil) }
   scope :local, -> { where(domain: nil) }
   scope :without_followers, -> { where(followers_count: 0) }

app/models/account_moderation_note.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: account_moderation_notes
+#
+#  id                :integer          not null, primary key
+#  content           :text             not null
+#  account_id        :integer
+#  target_account_id :integer
+#  created_at        :datetime         not null
+#  updated_at        :datetime         not null
+#
+
+class AccountModerationNote < ApplicationRecord
+  belongs_to :account
+  belongs_to :target_account, class_name: 'Account'
+
+  scope :latest, -> { reorder('created_at DESC') }
+
+  validates :content, presence: true, length: { maximum: 500 }
+end