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

app/models/searchRequest.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const { AD_TYPE } = require("../common/enums");
+const { AD_TYPE, EMAIL_FREQUENCY } = require("../common/enums");
 
 module.exports = (sequelize, DataTypes) => {
   const SearchRequest = sequelize.define("SearchRequest", {
@@ -61,6 +61,11 @@ module.exports = (sequelize, DataTypes) => {
       type: DataTypes.BOOLEAN,
       defaultValue: false,
       allowNull: false
+    },
+    emailFrequency: {
+      type: DataTypes.TEXT,
+      defaultValue: EMAIL_FREQUENCY.ASAP.stringId,
+      allowNull: false
     }
   });