add migration and update model to include email frequency in search req

app/migrations/20191101113541-add-emailFrequency-column-to-searchRequest-table.js

@@ -0,0 +1,15 @@
+"use strict";
+const { EMAIL_FREQUENCY } = require("../common/enums");
+
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return queryInterface.addColumn("SearchRequests", "emailFrequency", {
+      type: Sequelize.TEXT,
+      defaultValue: EMAIL_FREQUENCY.ASAP.stringId
+    });
+  },
+
+  down: (queryInterface, Sequelize) => {
+    return queryInterface.removeColumn("SearchRequests", "emailFrequency");
+  }
+};