[fixes] Based on APM findings

app/controllers/api/v1/account_by_username_controller.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class Api::V1::AccountByUsernameController < EmptyController
+class Api::V1::AccountByUsernameController < API::BaseController
   before_action :set_account
   before_action :check_account_suspension
   before_action :check_account_local

app/controllers/api/v1/timelines/home_controller.rb

@@ -62,6 +62,7 @@ class Api::V1::Timelines::HomeController < Api::BaseController
   end
 
   def regeneration_in_progress?
-    Redis.current.exists?("account:#{current_account.id}:regeneration")
+    false
+    # Redis.current.exists?("account:#{current_account.id}:regeneration")
   end
 end

app/controllers/settings/preferences_controller.rb

@@ -9,7 +9,7 @@ class Settings::PreferencesController < Settings::BaseController
 
   def update
     user_settings.update(user_settings_params.to_h)
-    current_user.force_regeneration!
+    # current_user.force_regeneration!
 
     if current_user.update(user_params)
       I18n.locale = current_user.locale

app/models/user.rb

@@ -246,7 +246,7 @@ class User < ApplicationRecord
   end
 
   def force_regeneration!
-    Redis.current.set("account:#{account_id}:regeneration", true)
+    # Redis.current.set("account:#{account_id}:regeneration", true)
   end
 
   protected
@@ -283,9 +283,10 @@ class User < ApplicationRecord
   end
 
   def regenerate_feed!
-    return unless Redis.current.setnx("account:#{account_id}:regeneration", true)
-    Redis.current.expire("account:#{account_id}:regeneration", 1.day.seconds)
-    RegenerationWorker.perform_async(account_id)
+    # return unless Redis.current.setnx("account:#{account_id}:regeneration", true)
+    # Redis.current.expire("account:#{account_id}:regeneration", 1.day.seconds)
+    # RegenerationWorker.perform_async(account_id)
+    return
   end
 
   def needs_feed_update?

app/services/precompute_feed_service.rb

@@ -2,8 +2,8 @@
 
 class PrecomputeFeedService < BaseService
   def call(account)
-    FeedManager.instance.populate_feed(account)
+    # FeedManager.instance.populate_feed(account)
   ensure
-    Redis.current.del("account:#{account.id}:regeneration")
+    # Redis.current.del("account:#{account.id}:regeneration")
   end
 end