brenogazzola

# Rails + PostgreSQL Performance Audit Playbook

A field-tested method for finding what's actually burning your database CPU, built for a
Rails monolith on managed PostgreSQL (Cloud SQL / RDS / etc.). It assumes no APM — just
`pg_stat_statements`, `pg_stat_activity`, and discipline. It pairs well with an LLM: point
one at this file plus your query results and let it do the attribution; the queries below
are ordered so a human can run them and paste results back.

## The core idea

brenogazzola

require "rake"

Rake::Task["assets:precompile"].enhance do
  assembly    = Rails.application.assets
  output_path = assembly.config.output_path

  assembly.load_path.assets.each do |asset|
    asset_path      = output_path.join(asset.digested_path)
    compressed_path = output_path.join(asset.digested_path.to_s + ".br")

brenogazzola

import { DirectUpload } from '../rails/activestorage'

export default class {
  constructor (input) {
    this.input    = input

    this.submit   = input.form.querySelector('.btn-submit')           // The submit button. We show loading progress here
    this.progress = this.submit.querySelector('.btn-submit-progress') // The progress bar inside the submit
    this.loader   = this.submit.querySelector('.btn-submit-loader')   // The loader animation inside the submit

brenogazzola

// Remove all drafts from your drafts view
// Navigate to drafts
// F12 to raise dev console
// Paste the below
(async function(x) {
    for (const e of [...document.querySelectorAll('[type="trash"]')]) {
        e.click(); 
        await new Promise(resolve => setTimeout(resolve, 500))
        document.querySelector('[data-qa="drafts_page_draft_delete_confirm"]').click();
        await new Promise(resolve => setTimeout(resolve, 1500))

brenogazzola

#!/usr/bin/env bash

uninstall() {
  list=`gem list --no-versions`
  for gem in $list; do
    gem uninstall $gem -aIx
  done
  gem list
  gem install bundler
}

brenogazzola

# After active storage urls are changed, use this to recreate all trix attachments
  def self.refresh_trixes
    ActionText::RichText.where.not(body: nil).find_each do |trix|
      Trix::RefreshJob.perform_later(trix)
    end
  end

  # After active storage urls are changed, use this to recreate a specific strix attachments
  def self.refresh_trix(trix)
    return unless trix.embeds.size.positive?

brenogazzola

import Rails from '@rails/ujs'

const DirectUpload = {
  start () {
    document.addEventListener('direct-upload:initialize', DirectUpload.initialize)
    document.addEventListener('direct-upload:start', DirectUpload.begin)
    document.addEventListener('direct-upload:progress', DirectUpload.progress)
    document.addEventListener('direct-upload-error', DirectUpload.error)
    document.addEventListener('direct-upload:end', DirectUpload.end)
  },

brenogazzola

# frozen_string_literal: true

require "datadog/statsd"

class QueueTime
  def initialize(app)
    @app = app
  end

  def call(env)

brenogazzola

import { Controller } from 'stimulus'

export default class extends Controller {
  // ============================================================================
  // Public
  // ============================================================================

  /*
   * Removes an element from the DOM
   */

brenogazzola

require 'benchmark/ips'

content = %(
  .prop 1 { background: url(file.jpg); }
  .prop 2 { background: url( file.jpg ); }
  .prop 3 { background: url("file.jpg"); }
  .prop 4 { background: url('file.jpg'); }
  .prop 5 { background: url('/file.jpg'); }
  .prop 6 { background: url('./file.jpg'); }
  .prop 7 { background: url('./images/file.jpg'); }