Booking and ticketing related updates

apps/edr-passenger-api/prisma/schema.prisma

@@ -437,6 +437,7 @@ model Seat {
   coach        Coach         @relation(fields: [coachId], references: [id])
   bookingSeats BookingSeat[]
   blocks       SeatBlock[]
+  ticketSeats  TicketSeat[]
   @@unique([coachId, row, col])
   @@unique([coachId, seatNumber])
 
@@ -627,6 +628,20 @@ model Ticket {
   validatorId String?
   booking Booking @relation(fields: [bookingId], references: [id])
   validationLogs GateValidationLog[]
+  seats TicketSeat[]
+
+  @@schema("passenger")
+}
+
+model TicketSeat {
+  id        String   @id @default(uuid())
+  ticketId  String
+  seatId    String
+  seatIndex Int      @default(0)
+  ticket    Ticket   @relation(fields: [ticketId], references: [id], onDelete: Cascade)
+  seat      Seat     @relation(fields: [seatId], references: [id])
+  @@index([ticketId])
+  @@index([seatId])
 
   @@schema("passenger")
 }