some of the backend is working

backend/models/event.js

@@ -0,0 +1,19 @@
+var mongoose = require('mongoose');
+var {callSchema} = require('./call');
+console.log(callSchema)
+
+var groupSchema = mongoose.Schema({
+  title: String,
+  description: String,
+  expireTime: Number,
+  startTime: Number,
+  endTime: Number,
+  shortNames: [String],
+  calls: [callSchema]
+},
+{
+  timestamps: true
+});
+
+
+module.exports = mongoose.model('Event', groupSchema);