get db and calendar bookings in parallel

db/index.ts

@@ -14,9 +14,10 @@ mongoose.connect(process.env.MONGO_URI, {
 export async function getBookedDays(
   uuidsToIngore?: string[]
 ): Promise<string[]> {
-  const bookedInDatabase = await BookingModel.findBookedDays(uuidsToIngore)
-  const bookedInCalendar = await calendarGetBookedDays()
-
+  const [bookedInDatabase, bookedInCalendar] = await Promise.all([
+    BookingModel.findBookedDays(uuidsToIngore),
+    calendarGetBookedDays(),
+  ])
   return [...bookedInDatabase, ...bookedInCalendar].filter(uniqueFilter).sort()
 }