prevent locking upload response; show processing status on upload screen

models/processing.js

@@ -0,0 +1,11 @@
+'use strict';
+
+module.exports = (sequelize, DataTypes) => {
+    const processing = sequelize.define('processing', {
+        processing: DataTypes.BOOLEAN,
+    }, {});
+    processing.associate = function(models) {
+        // associations can be defined here
+    };
+    return processing;
+};