diff --git a/server/initializers/constants.ts b/server/initializers/constants.ts
index 020ed68da..a92fd22d6 100644
--- a/server/initializers/constants.ts
+++ b/server/initializers/constants.ts
@@ -27,7 +27,7 @@ import { CONFIG, registerConfigChangedHandler } from './config'
 
 // ---------------------------------------------------------------------------
 
-const LAST_MIGRATION_VERSION = 775
+const LAST_MIGRATION_VERSION = 780
 
 // ---------------------------------------------------------------------------
 
diff --git a/server/initializers/migrations/0780-notification-registration.ts b/server/initializers/migrations/0780-notification-registration.ts
new file mode 100644
index 000000000..5f1e0d2ea
--- /dev/null
+++ b/server/initializers/migrations/0780-notification-registration.ts
@@ -0,0 +1,30 @@
+import * as Sequelize from 'sequelize'
+
+async function up (utils: {
+  transaction: Sequelize.Transaction
+  queryInterface: Sequelize.QueryInterface
+  sequelize: Sequelize.Sequelize
+}): Promise<void> {
+  const { transaction } = utils
+
+  {
+    await utils.sequelize.query('DELETE FROM "userNotification" WHERE type = 20 AND "userRegistrationId" IS NULL', { transaction })
+  }
+
+  {
+    await utils.sequelize.query(
+      'ALTER TABLE "userNotification" DROP CONSTRAINT "userNotification_userRegistrationId_fkey", ' +
+      'ADD CONSTRAINT "userNotification_userRegistrationId_fkey" ' +
+      'FOREIGN KEY ("userRegistrationId") REFERENCES "userRegistration" ("id") ON DELETE CASCADE ON UPDATE CASCADE',
+      { transaction })
+  }
+}
+
+function down (options) {
+  throw new Error('Not implemented.')
+}
+
+export {
+  up,
+  down
+}
diff --git a/server/middlewares/rate-limiter.ts b/server/middlewares/rate-limiter.ts
index 1eef8b360..0e936028c 100644
--- a/server/middlewares/rate-limiter.ts
+++ b/server/middlewares/rate-limiter.ts
@@ -45,5 +45,4 @@ export function buildRateLimiter (options: {
 
 function sendRateLimited (res: express.Response, options: RateLimitHandlerOptions) {
   return res.status(options.statusCode).send(options.message)
-
 }