fix(identity): repair broken Notification migration

PR #14207 removed src/models/notification.js but left
20191107223636-create-viewed-field.js calling models.Notification.update().
On a fresh DB the migration crashes with "Cannot read properties of
undefined (reading 'update')". The break went undetected because
CircleCI was disabled before that PR landed.

Replace the ORM call with a raw UPDATE — the Notifications table itself
is still created by 20191025193919-create-notification.js and was never
dropped, so the migration still has a real table to write to.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: dylanjeffers

packages/identity-service/sequelize/migrations/20191107223636-create-viewed-field.js

@@ -1,5 +1,4 @@
 'use strict'
-const models = require('../../src/models')
 
 module.exports = {
   up: (queryInterface, Sequelize) => {
@@ -14,11 +13,12 @@ module.exports = {
         { transaction }
       )
 
-      await models.Notification.update(
-        {
-          isViewed: false
-        },
-        { transaction, where: { isRead: { [models.Sequelize.Op.ne]: null } } }
+      // Raw SQL instead of models.Notification.update — the Notification model
+      // was removed in #14207 but the Notifications table still exists in the
+      // schema, so this migration must keep running on fresh databases.
+      await queryInterface.sequelize.query(
+        'UPDATE "Notifications" SET "isViewed" = false WHERE "isRead" IS NOT NULL',
+        { transaction }
       )
 
       await queryInterface.changeColumn(