Remove down method in migration

db/migrate/20201027002551_migrate_services_to_http_integrations.rb

@@ -46,15 +46,6 @@ class MigrateServicesToHttpIntegrations < ActiveRecord::Migration[6.0]
   end
 
   def down
-    sql = <<~SQL
-      SELECT project_id FROM services
-      WHERE type = '#{ALERT_SERVICE_TYPE}'
-    SQL
-
-    select_values(sql).each do |project_id|
-      HttpIntegration
-        .where(project_id: project_id, endpoint_identifier: SERVICE_NAMES_IDENTIFIER[:identifier])
-        .delete_all
-    end
+    # no-op
   end
 end

spec/migrations/20201027002551_migrate_services_to_http_integrations_spec.rb

@@ -23,20 +23,4 @@ RSpec.describe MigrateServicesToHttpIntegrations do
       expect(http_integration.endpoint_identifier).to eq(described_class::SERVICE_NAMES_IDENTIFIER[:identifier])
     end
   end
-
-  describe '#down' do
-    before do
-      http_integrations.create!(
-        project_id: project.id,
-        name: described_class::SERVICE_NAMES_IDENTIFIER[:name],
-        endpoint_identifier: described_class::SERVICE_NAMES_IDENTIFIER[:identifier],
-        encrypted_token: 'test',
-        encrypted_token_iv: 'test'
-      )
-    end
-
-    it 'removes the existing http integrations' do
-      expect { described_class.new.down }.to change { http_integrations.count }.from(1).to(0)
-    end
-  end
 end