Remove JenkinsDeprecatedService records from DB

This migration is executed twice to make sure that no new records
are created before the code is promoted to prod from canary.

db/migrate/20200511130129_remove_deprecated_jenkins_service_records.rb

+# frozen_string_literal: true
+
+class RemoveDeprecatedJenkinsServiceRecords < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  def up
+    execute <<~SQL.strip
+      DELETE FROM services WHERE type = 'JenkinsDeprecatedService';
+    SQL
+  end
+
+  def down
+    # no-op
+
+    # The records were removed by `up`
+  end
+end

db/post_migrate/20200511130130_ensure_deprecated_jenkins_service_records_removal.rb

+# frozen_string_literal: true
+
+class EnsureDeprecatedJenkinsServiceRecordsRemoval < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  def up
+    execute <<~SQL.strip
+      DELETE FROM services WHERE type = 'JenkinsDeprecatedService';
+    SQL
+  end
+
+  def down
+    # no-op
+
+    # The records were removed by `up`
+  end
+end

db/structure.sql

@@ -13791,6 +13791,8 @@ COPY "schema_migrations" (version) FROM STDIN;
 20200511121549
 20200511121610
 20200511121620
+20200511130129
+20200511130130
 20200511145545
 20200511162057
 20200511162115

spec/migrations/remove_deprecated_jenkins_service_records_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+require Rails.root.join('db', 'migrate', '20200511130129_remove_deprecated_jenkins_service_records.rb')
+require Rails.root.join('db', 'post_migrate', '20200511130130_ensure_deprecated_jenkins_service_records_removal.rb')
+
+shared_examples 'remove DeprecatedJenkinsService records' do
+  let(:services) { table(:services) }
+
+  before do
+    services.create!(type: 'JenkinsDeprecatedService')
+    services.create!(type: 'JenkinsService')
+  end
+
+  it 'deletes services when template and attached to a project' do
+    expect { migrate! }
+      .to change { services.where(type: 'JenkinsDeprecatedService').count }.from(1).to(0)
+      .and not_change { services.where(type: 'JenkinsService').count }
+  end
+end
+
+describe RemoveDeprecatedJenkinsServiceRecords, :migration do
+  it_behaves_like 'remove DeprecatedJenkinsService records'
+end
+
+describe EnsureDeprecatedJenkinsServiceRecordsRemoval, :migration do
+  it_behaves_like 'remove DeprecatedJenkinsService records'
+end