also get booked days from calendar

db/index.ts

@@ -1,7 +1,9 @@
 import * as mongoose from 'mongoose'
 import BookingModel, { Booking, BookingDocument } from './booking'
 import BillModel, { Bill } from './bill'
+import { getBookedDays as calendarGetBookedDays } from '../lib/googlecalendar'
 import { BOOKING_STATUS } from './enums'
+import { uniqueFilter } from '../helpers/array'
 
 let connectedPromise: Promise<mongoose.Mongoose>
 
@@ -21,7 +23,12 @@ export async function getBookedDays(
   uuidsToIngore?: string[]
 ): Promise<string[]> {
   await connect()
-  return BookingModel.findBookedDays(uuidsToIngore)
+  const bookedInDatabase = await BookingModel.findBookedDays(uuidsToIngore);
+  const bookedInCalendar = await calendarGetBookedDays();
+
+  return [ ...bookedInDatabase, ...bookedInCalendar]
+     .filter(uniqueFilter)
+     .sort();
 }
 
 export async function getBookingByUUID(uuid: string): Promise<BookingDocument> {