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letters = Array('a'..'z')
shift   = 3
 
translation_map = letters.zip(letters.rotate(shift)).to_h
 
"hello".chars.map { |ch| translation_map[ch] }.join

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SET temp_buffers = 1000MB -- or whatever you can spare temporarily

CREATE TEMP TABLE tmp AS
SELECT t.*
FROM   tbl t
LEFT   JOIN del_list d USING (id)
WHERE  d.id IS NULL;      -- copy surviving rows into temporary table

TRUNCATE tbl;             -- empty table - truncate is very fast for big tables

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class DropDelayedJobTable < ActiveRecord::Migration
  def up
    drop_table :delayed_jobs
  end

  def down
    raise ActiveRecord::IrreversibleMigration
  end
end

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DELIMITER $$
CREATE FUNCTION levenshtein( s1 VARCHAR(255), s2 VARCHAR(255) ) 
  RETURNS INT 
  DETERMINISTIC 
  BEGIN 
    DECLARE s1_len, s2_len, i, j, c, c_temp, cost INT; 
    DECLARE s1_char CHAR; 
    -- max strlen=255 
    DECLARE cv0, cv1 VARBINARY(256); 
    SET s1_len = CHAR_LENGTH(s1), s2_len = CHAR_LENGTH(s2), cv1 = 0x00, j = 1, i = 1, c = 0; 

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class Api::DelayedController < ApplicationController
  # Public: Adds a delayed job into queue.
  #
  # params[:task] - The class name of the job.
  # 
  def add
    job = params[:task].constantize
    Sidekiq::Client.enqueue job  if Object.const_defined?(Sidekiq::Client)
    Delayed::Job.enqueue  job.new if Object.const_defined?(Delayed::Job)
    render :text => "Background job queued", :status => :created

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# every 5 minutes run this script ↓
*/12 * * * *   /path/to/kill_memleaked_rails.sh

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# Русский перевод для https://github.com/plataformatec/devise/tree/v1.4.2
# Другие переводы на https://github.com/plataformatec/devise/wiki/I18n

ru:
  errors:
    messages:
      expired: "устарела. Пожалуйста, запросите новую"
      not_found: "не найдена"
      already_confirmed: "уже подтверждена. Пожалуйста, попробуйте войти в систему"
      not_locked: "не заблокирована"