SECURITY: Limit length of edit reason column

app/models/post.rb

@@ -64,6 +64,7 @@ class Post < ActiveRecord::Base
   has_many :reviewables, as: :target, dependent: :destroy
 
   validates_with PostValidator, unless: :skip_validation
+  validates :edit_reason, length: { maximum: 1000 }
 
   after_commit :index_search
 

spec/models/post_spec.rb

@@ -61,6 +61,7 @@ RSpec.describe Post do
   end
 
   it { is_expected.to validate_presence_of :raw }
+  it { is_expected.to validate_length_of(:edit_reason).is_at_most(1000) }
 
   # Min/max body lengths, respecting padding
   it { is_expected.not_to allow_value("x").for(:raw) }