1 files changed, 31 insertions, 0 deletions
diff --git a/db/post_migrate/20201203123201_remove_orphan_service_hooks.rb b/db/post_migrate/20201203123201_remove_orphan_service_hooks.rb
new file mode 100644
index 00000000000..c430e2205c2
--- /dev/null
+++ b/db/post_migrate/20201203123201_remove_orphan_service_hooks.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+class RemoveOrphanServiceHooks < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  class WebHook < ActiveRecord::Base
+    include EachBatch
+
+    self.table_name = 'web_hooks'
+
+    def self.service_hooks
+      where(type: 'ServiceHook')
+    end
+  end
+
+  class Service < ActiveRecord::Base
+    self.table_name = 'services'
+  end
+
+  def up
+    WebHook.service_hooks.where.not(service_id: Service.select(:id)).where.not(service_id: nil).each_batch do |relation|
+      relation.delete_all
+    end
+  end
+
+  def down
+    # no-op
+  end
+end