default freeze string literals where present

environment.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 RubyVM::YJIT.enable
 ENV['RACK_ENV'] ||= 'development'
 ENV['TZ'] = 'UTC'

models/event.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Event < Sequel::Model
   include Sequel::ParanoidDelete
 

models/site.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'tilt'
 require 'rss'
 require 'nokogiri'
@@ -144,7 +145,7 @@ class Site < Sequel::Model
   BLOCK_JERK_PERCENTAGE = 30
   BLOCK_JERK_THRESHOLD = 25
   MAXIMUM_TAGS = 5
-  MAX_USERNAME_LENGTH = 32.freeze
+  MAX_USERNAME_LENGTH = 32
 
   LEGACY_SUPPORTER_PRICES = {
     plan_one: 1,

models/site_change.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class SiteChange < Sequel::Model
   NEW_CHANGE_TIMEOUT = 3600 * 24 # 24 hours
   many_to_one :site

models/site_file.rb

@@ -1,8 +1,10 @@
+# frozen_string_literal: true
+
 require 'sanitize'
 
 class SiteFile < Sequel::Model
-  CLASSIFIER_LIMIT = 1_000_000.freeze
+  CLASSIFIER_LIMIT = 1_000_000
-  CLASSIFIER_WORD_LIMIT = 25.freeze
+  CLASSIFIER_WORD_LIMIT = 25
   unrestrict_primary_key
   plugin :update_primary_key
   many_to_one :site

models/stat.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'resolv'
 require 'zlib'
 

models/stat_location.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'geoip'
 
 class StatLocation < Sequel::Model

models/stat_path.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class StatPath < Sequel::Model
   RETAINMENT_DAYS = 7
 

models/stat_referrer.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class StatReferrer < Sequel::Model
   many_to_one :site
   RETAINMENT_DAYS = 7

models/tag.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Tag < Sequel::Model
 	NAME_LENGTH_MAX = 25
 	NAME_WORDS_MAX = 1