add cancellation for booking

apps/edr-freight-api/src/modules/bookings/booking-transition.service.ts

@@ -429,6 +429,20 @@ export class BookingTransitionService {
     return fresh;
   }
 
+  /**
+   * Customer self-service cancel, allowed only before payment — no fee.
+   * SELECTED_FOR_BATCH releases the wagon hold immediately; earlier statuses
+   * take the plain cancel path (open invoices expired, nothing reserved yet).
+   * Anything past payment falls through to cancel()'s status assertion.
+   */
+  async customerCancel(bookingId: string, reason?: string): Promise<Booking> {
+    const booking = await this.bookingsService.findById(bookingId);
+    if (booking.status === "SELECTED_FOR_BATCH") {
+      return this.cancelHold(bookingId, reason);
+    }
+    return this.cancel(bookingId, reason ?? "Customer cancelled before payment");
+  }
+
   async cancel(bookingId: string, reason: string): Promise<Booking> {
     const booking = await this.bookingsService.findById(bookingId);
     assertBookingStatus(booking, [
@@ -978,6 +992,15 @@ export class BookingTransitionService {
     // booking through the space checks below AND is persisted so the accept /
     // reserve path locks onto that train (pickExportSchedule honors it).
     const requestedId = isExportTrain ? (requestedTrainScheduleId ?? null) : null;
+    // Export rail rides the exact train the customer picked — never an
+    // auto-assigned one. Both portal flows (clearance + contract completion)
+    // surface a picker, so a missing id is an invalid submission, not a
+    // legitimate "let the system choose".
+    if (isExportTrain && !requestedId) {
+      throw new BadRequestException(
+        "Select a train for the chosen shipment day.",
+      );
+    }
     const scheduledBooking = {
       ...booking,
       scheduledDate: date,

apps/edr-freight-api/src/modules/bookings/bookings.controller.ts

@@ -1335,6 +1335,19 @@ export class BookingsController {
     return this.transitionService.enrichBookingResponse(booking);
   }
 
+  @Post(":id/customer-cancel")
+  @ApiOperation({
+    summary:
+      "Customer cancels their own booking before payment — no cancellation fee",
+  })
+  async customerCancel(
+    @Param("id", ParseUUIDPipe) id: string,
+    @Body() dto: RejectBookingDto,
+  ) {
+    const booking = await this.transitionService.customerCancel(id, dto.reason);
+    return this.transitionService.enrichBookingResponse(booking);
+  }
+
   @Post(":id/cancel-hold")
   @ApiOperation({
     summary: