feat: upgrade to Mongoose 9 and adjust middleware

Update `mongoose` to v9.1.5 and convert middleware hooks.

Co-authored-by: Thomas Ruoff <111471+tomru@users.noreply.github.com>

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+  "files.readonlyInclude": {
+    "**/*": true
+  }
+}

db/booking.ts

@@ -101,16 +101,15 @@ const BookingSchema = new mongoose.Schema(
   }
 )
 
-BookingSchema.pre('validate', function (next: () => void): void {
+BookingSchema.pre('validate', function (): void {
   const booking = this
   booking.days = getDays({
     startDate: new Date(booking.startDate),
     endDate: new Date(booking.endDate),
   })
-  next()
 })
 
-BookingSchema.pre('save', async function (next: () => void): Promise<void> {
+BookingSchema.pre('save', async function (): Promise<void> {
   const booking = this
 
   if (!booking.calendarEventId) {
@@ -122,8 +121,6 @@ BookingSchema.pre('save', async function (next: () => void): Promise<void> {
     // event has been canceled or rejected, delete calendar event again to free up the slot
     await deleteCalendarEvent(booking.toJSON())
   }
-
-  next()
 })
 
 BookingSchema.static(

package.json

@@ -23,7 +23,7 @@
     "date-fns": "^4.1.0",
     "googleapis": "^148.0.0",
     "ics": "^3.8.1",
-    "mongoose": "^8.15.1",
+    "mongoose": "^9.1.5",
     "next": "^15.3.9",
     "next-auth": "^4.24.13",
     "next-axiom": "^1.10.0",