jobs: remove DelayedJobs.

Remove the DelayedJobs gem and database table. Completes the transition
to GoodJob started in c06bfa64f and f4953549a.

Downstream users can upgrade as follows:

* Stop the Rails server.
* Stop the DelayedJobs worker (normally running as `bin/delayed_job` or `bin/rails jobs:work`).
* Run `bin/rails jobs:work` to finish any pending delayed jobs.
* Run `bin/rails db:migrate` to create the good_jobs table and drop the delayed_jobs table.
* Start the Rails server again.
* Start the GoodJobs worker with `bin/good_job start`.

Gemfile

@@ -4,8 +4,6 @@ gem 'dotenv-rails', :require => "dotenv/rails-now"
 
 gem "rails", "~> 6.0"
 gem "pg"
-gem "delayed_job"
-gem "delayed_job_active_record"
 gem "simple_form"
 gem "sanitize"
 gem 'ruby-vips'

Gemfile.lock

@@ -135,11 +135,6 @@ GEM
     dead_end (3.1.0)
     debug_inspector (1.1.0)
     declarative (0.0.20)
-    delayed_job (4.1.9)
-      activesupport (>= 3.0, < 6.2)
-    delayed_job_active_record (4.1.6)
-      activerecord (>= 3.0, < 6.2)
-      delayed_job (>= 3.0, < 5)
     derailed_benchmarks (2.1.1)
       benchmark-ips (~> 2)
       dead_end
@@ -537,8 +532,6 @@ DEPENDENCIES
   clockwork
   codecov
   daemons
-  delayed_job
-  delayed_job_active_record
   derailed_benchmarks
   diff-lcs
   dotenv-rails

bin/delayed_job

@@ -1,6 +0,0 @@
-#!/usr/bin/env ruby
-
-require File.expand_path(File.join(File.dirname(__FILE__), '..', 'config', 'environment'))
-require 'delayed/command'
-Delayed::Job.connection.execute "set statement_timeout=0"
-Delayed::Command.new(ARGV).daemonize

config/initializers/delayed_jobs.rb

@@ -1,14 +0,0 @@
-require 'delayed/plugin'
-
-class DelayedJobTimeoutPlugin < ::Delayed::Plugin
-  callbacks do |lifecycle|
-    lifecycle.before(:execute) do |job|
-      Delayed::Job.connection.execute "set statement_timeout = 0"
-    end
-  end
-end
-
-Delayed::Worker.logger = Logger.new(STDERR, level: :debug)
-Delayed::Worker.default_queue_name = "default"
-Delayed::Worker.destroy_failed_jobs = false
-Delayed::Worker.plugins << DelayedJobTimeoutPlugin

db/migrate/20220104214319_drop_delayed_jobs.rb

@@ -0,0 +1,24 @@
+class DropDelayedJobs < ActiveRecord::Migration[6.1]
+  def up
+    drop_table :delayed_jobs
+  end
+
+  def down
+    create_table :delayed_jobs do |t|
+      t.integer  :priority, default: 0
+      t.integer  :attempts, default: 0
+      t.text     :handler
+      t.text     :last_error
+      t.datetime :run_at
+      t.datetime :locked_at
+      t.datetime :failed_at
+      t.string   :locked_by
+      t.timestamps null: false
+      t.string   :queue
+    end
+
+    add_index :delayed_jobs, :run_at
+    add_index :delayed_jobs, :locked_at
+    add_index :delayed_jobs, :locked_by
+  end
+end

db/structure.sql

@@ -475,46 +475,6 @@ CREATE SEQUENCE public.comments_id_seq
 ALTER SEQUENCE public.comments_id_seq OWNED BY public.comments.id;
 
 
---
--- Name: delayed_jobs; Type: TABLE; Schema: public; Owner: -
---
-
-CREATE TABLE public.delayed_jobs (
-    id integer NOT NULL,
-    priority integer DEFAULT 0,
-    attempts integer DEFAULT 0,
-    handler text,
-    last_error text,
-    run_at timestamp without time zone,
-    locked_at timestamp without time zone,
-    failed_at timestamp without time zone,
-    locked_by character varying,
-    created_at timestamp without time zone NOT NULL,
-    updated_at timestamp without time zone NOT NULL,
-    queue character varying
-);
-
-
---
--- Name: delayed_jobs_id_seq; Type: SEQUENCE; Schema: public; Owner: -
---
-
-CREATE SEQUENCE public.delayed_jobs_id_seq
-    AS integer
-    START WITH 1
-    INCREMENT BY 1
-    NO MINVALUE
-    NO MAXVALUE
-    CACHE 1;
-
-
---
--- Name: delayed_jobs_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: -
---
-
-ALTER SEQUENCE public.delayed_jobs_id_seq OWNED BY public.delayed_jobs.id;
-
-
 --
 -- Name: dmails; Type: TABLE; Schema: public; Owner: -
 --
@@ -2331,13 +2291,6 @@ ALTER TABLE ONLY public.comment_votes ALTER COLUMN id SET DEFAULT nextval('publi
 ALTER TABLE ONLY public.comments ALTER COLUMN id SET DEFAULT nextval('public.comments_id_seq'::regclass);
 
 
---
--- Name: delayed_jobs id; Type: DEFAULT; Schema: public; Owner: -
---
-
-ALTER TABLE ONLY public.delayed_jobs ALTER COLUMN id SET DEFAULT nextval('public.delayed_jobs_id_seq'::regclass);
-
-
 --
 -- Name: dmails id; Type: DEFAULT; Schema: public; Owner: -
 --
@@ -2727,14 +2680,6 @@ ALTER TABLE ONLY public.comments
     ADD CONSTRAINT comments_pkey PRIMARY KEY (id);
 
 
---
--- Name: delayed_jobs delayed_jobs_pkey; Type: CONSTRAINT; Schema: public; Owner: -
---
-
-ALTER TABLE ONLY public.delayed_jobs
-    ADD CONSTRAINT delayed_jobs_pkey PRIMARY KEY (id);
-
-
 --
 -- Name: dmails dmails_pkey; Type: CONSTRAINT; Schema: public; Owner: -
 --
@@ -3383,27 +3328,6 @@ CREATE INDEX index_comments_on_creator_ip_addr ON public.comments USING btree (c
 CREATE INDEX index_comments_on_post_id ON public.comments USING btree (post_id);
 
 
---
--- Name: index_delayed_jobs_on_locked_at; Type: INDEX; Schema: public; Owner: -
---
-
-CREATE INDEX index_delayed_jobs_on_locked_at ON public.delayed_jobs USING btree (locked_at);
-
-
---
--- Name: index_delayed_jobs_on_locked_by; Type: INDEX; Schema: public; Owner: -
---
-
-CREATE INDEX index_delayed_jobs_on_locked_by ON public.delayed_jobs USING btree (locked_by);
-
-
---
--- Name: index_delayed_jobs_on_run_at; Type: INDEX; Schema: public; Owner: -
---
-
-CREATE INDEX index_delayed_jobs_on_run_at ON public.delayed_jobs USING btree (run_at);
-
-
 --
 -- Name: index_dmails_on_created_at; Type: INDEX; Schema: public; Owner: -
 --
@@ -5181,6 +5105,7 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20211018062916'),
 ('20211023225730'),
 ('20211121080239'),
-('20220101224048');
+('20220101224048'),
+('20220104214319');