[CHANGE] added migrations

.gitignore

@@ -2,4 +2,5 @@ node_modules
 .idea
 ecosystem.config.js
 newrelic.js
-newrelic_agent.log
+newrelic_agent.log
+.DS_STORE

migrations/20190712083150-partialIndexToQuizQuestions.js

@@ -0,0 +1,25 @@
+'use strict';
+
+module.exports = {
+  async up(queryInterface, Sequelize) {
+    await queryInterface.addIndex('quizQuestions', {
+      name: "quizQuestions_quizId_questionsid_partialIndex",
+      fields: ["quizId", "questionId"],
+      unique: "id",
+      where: {
+        deletedAt: null
+      }
+    })
+    await queryInterface.removeConstraint('quizQuestions', 'quizQuestions_questionId_quizId_key')
+  },
+
+  down: (queryInterface, Sequelize) => {
+    /*
+      Add reverting commands here.
+      Return a promise to correctly handle asynchronicity.
+
+      Example:
+      return queryInterface.dropTable('users');
+    */
+  }
+};