Remove Flowdock integration records

Changelog: removed

db/post_migrate/20221129124240_remove_flowdock_integration_records.rb

+# frozen_string_literal: true
+
+class RemoveFlowdockIntegrationRecords < Gitlab::Database::Migration[2.0]
+  disable_ddl_transaction!
+
+  restrict_gitlab_migration gitlab_schema: :gitlab_main
+
+  class Integration < MigrationRecord
+    include EachBatch
+
+    self.table_name = 'integrations'
+  end
+
+  def up
+    Integration.each_batch(of: 100_000, column: :id) do |relation|
+      relation.delete_by(type_new: 'Integrations::Flowdock')
+    end
+  end
+
+  def down
+    # no-op
+  end
+end

db/schema_migrations/20221129124240

+ae20537326115d37db8beb3432ffd3ace447b39a75906535d319da4db1fcb1b2
\ No newline at end of file

spec/migrations/remove_flowdock_integration_records_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+require Rails.root.join('db/post_migrate/20221129124240_remove_flowdock_integration_records.rb')
+
+RSpec.describe RemoveFlowdockIntegrationRecords, feature_category: :integrations do
+  let(:integrations) { table(:integrations) }
+
+  before do
+    integrations.create!(type_new: 'Integrations::Flowdock')
+    integrations.create!(type_new: 'SomeOtherType')
+  end
+
+  it 'removes integrations records of type_new Integrations::Flowdock' do
+    expect(integrations.count).to eq(2)
+
+    migrate!
+
+    expect(integrations.count).to eq(1)
+    expect(integrations.first.type_new).to eq('SomeOtherType')
+    expect(integrations.where(type_new: 'Integrations::Flowdock')).to be_empty
+  end
+end