change relation

prisma/schema.prisma

@@ -29,7 +29,8 @@ model Bill {
   status          BillStatus        @default(UNINVOICED)
   tarif           Decimal
   additionalCosts AdditionalCosts[]
-  booking         Booking?
+  booking         Booking           @relation(fields: [bookingId], references: [id])
+  bookingId       Int               @unique
 }
 
 enum BookingStatus {
@@ -40,12 +41,11 @@ enum BookingStatus {
 }
 
 model Booking {
-  id              String        @id @default(uuid())
+  id              Int           @id @default(autoincrement())
   uuid            String        @unique @default(uuid())
   createdAt       DateTime      @default(now())
   updatedAt       DateTime      @updatedAt
-  bill            Bill?         @relation(fields: [billId], references: [id], onDelete: Cascade)
-  billId          Int?          @unique
+  bill            Bill?
   calendarEventId String?
   city            String
   destination     String