Db functions and event Schema w/ mongoose.

Create mongoose schema for Event and db.js to export ways we want to
interface with the database.

src/db.js

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+const mongoose = require('mongoose');
+mongoose.connect("mongodb://localhost:27017/ispmonitor", {
+  useNewUrlParser: true
+});
+
+const Event = require('./schemas/Event');
+
+const commitServiceEventToDatabase = async (serviceMessages, pdfFilename) => {
+  try {
+    // we only care about the second message
+    const message = serviceMessages[1]
+    const event = new Event({
+      date: new Date(),
+      isOk: message.isOk,
+      message: message.statusText,
+      pdfFilename
+    })
+
+    await event.save();
+    return serviceMessages
+  } catch (err) {
+    console.error('error from mongoose:')
+    console.error(err)
+    return serviceMessages
+  }
+}
+
+const getAllEvents = () => Event.find().exec()
+
+module.exports = {
+  commitServiceEventToDatabase,
+  getAllEvents
+}

src/schemas/Event.js

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+const mongoose = require('mongoose');
+const Schema = mongoose.Schema;
+
+const Event = new Schema({
+  date: Date,
+  isOk: Boolean,
+  message: String,
+  pdfFilename: String
+})
+
+module.exports = mongoose.model('Event', Event);