holy shit

https://github.com/sequelize/sequelize/issues/10360

server/migrations/20200129173454-user_email_index.js

@@ -0,0 +1,19 @@
+
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return queryInterface.addIndex('users', {
+      unique: true,
+      fields: ['email']
+    }).catch(e => {})
+  },
+
+  down: (queryInterface, Sequelize) => {
+    /*
+      Add reverting commands here.
+      Return a promise to correctly handle asynchronicity.
+
+      Example:
+      return queryInterface.dropTable('users');
+    */
+  }
+};