fix issue

apps/edr-freight-api/src/modules/routes/routes.service.ts

@@ -1,8 +1,15 @@
-import { BadRequestException, Injectable, NotFoundException } from '@nestjs/common';
-import { DataSource } from 'typeorm';
+import {
+  BadRequestException,
+  ConflictException,
+  Injectable,
+  NotFoundException,
+} from '@nestjs/common';
+import { TrainScheduleStatus } from '@edr/types';
+import { DataSource, In } from 'typeorm';
 
 import { deriveTradeDirection } from '../../common/derive-trade-direction.util';
 import { Yard } from '../rule-engine/entities/yard.entity';
+import { TrainSchedule } from '../train-schedules/entities/train-schedule.entity';
 import { CreateRouteDto } from './dto/create-route.dto';
 import { FilterRoutesDto } from './dto/filter-routes.dto';
 import { UpdateRouteDto } from './dto/update-route.dto';
@@ -112,6 +119,30 @@ export class RoutesService {
       ? await this.validateMilestones(dto.milestones)
       : null;
 
+    // Milestones or endpoints are about to be rewritten — reject if any
+    // non-terminal schedule still references this route, otherwise its stop list
+    // and distances would silently shift under a live plan. Status-only /
+    // label-only edits (no milestones supplied) are always allowed.
+    if (milestoneInput) {
+      const activeSchedules = await this.dataSource
+        .getRepository(TrainSchedule)
+        .count({
+          where: {
+            routeId: id,
+            status: In([
+              TrainScheduleStatus.Draft,
+              TrainScheduleStatus.Scheduled,
+              TrainScheduleStatus.Dispatched,
+            ]),
+          },
+        });
+      if (activeSchedules > 0) {
+        throw new ConflictException(
+          'This route is used by active train schedules and its stops cannot be changed. Create a new route instead.',
+        );
+      }
+    }
+
     await this.dataSource.transaction(async (manager) => {
       await manager.getRepository(Route).update(id, {
         originYardId: milestoneInput?.originYardId ?? existing.originYardId,