implement contract cancellation feature and update contract statuses

- Added functionality to cancel contracts, allowing users to provide a reason for cancellation.
- Updated contract statuses to include SUSPENDED and changed CLOSED to COMPLETED.
- Enhanced the UI to reflect the new cancellation option and updated messaging for contract statuses.
- Refactored contract booking actions to accommodate changes in booking logic for ONE_TIME and GENERAL contracts.
- Removed clearance document management from the contract detail page, as it is now handled per booking.
- Introduced a SQL script to reset bookings and train schedules for development purposes.

apps/edr-freight-api/src/modules/trains/train-builder.service.ts

@@ -3,6 +3,7 @@ import {
   BadRequestException,
   ConflictException,
   Injectable,
+  Logger,
   NotFoundException,
 } from '@nestjs/common';
 import { DataSource, EntityManager, ILike, In } from 'typeorm';
@@ -10,7 +11,7 @@ import { QueryDeepPartialEntity } from 'typeorm/query-builder/QueryPartialEntity
 
 import { Locomotive } from '../locomotives/entities/locomotive.entity';
 import { Yard } from '../rule-engine/entities/yard.entity';
-import { minLocomotiveLimits } from '../train-scheduling/train-capacity.util';
+import { combinedLocomotiveLimits } from '../train-scheduling/train-capacity.util';
 import { WagonType } from '../wagon-types/entities/wagon-type.entity';
 import { WagonMovement } from '../wagons/entities/wagon-movement.entity';
 import { Wagon } from '../wagons/entities/wagon.entity';
@@ -55,12 +56,14 @@ export interface ActiveScheduleRef {
  */
 @Injectable()
 export class TrainBuilderService {
+  private readonly logger = new Logger(TrainBuilderService.name);
+
   constructor(private readonly dataSource: DataSource) {}
 
   async buildTrain(dto: BuildTrainDto) {
     const locomotiveIds = [...new Set(dto.locomotiveIds)];
-    if (locomotiveIds.length < 2) {
-      throw new BadRequestException('A train must be pulled by at least two locomotives');
+    if (locomotiveIds.length < 1) {
+      throw new BadRequestException('A train must be pulled by at least one locomotive');
     }
 
     const trainId = await this.dataSource.transaction(async (manager) => {
@@ -96,7 +99,7 @@ export class TrainBuilderService {
       );
 
       // Effective haul capacity is capped by the weakest locomotive in the set.
-      const limits = minLocomotiveLimits(locomotives);
+      const limits = combinedLocomotiveLimits(locomotives);
       const train = await manager.getRepository(Train).save(
         manager.getRepository(Train).create({
           code,
@@ -283,7 +286,7 @@ export class TrainBuilderService {
         : null,
     }));
 
-    const limits = minLocomotiveLimits(
+    const limits = combinedLocomotiveLimits(
       (train.locomotives ?? [])
         .map((link) => link.locomotive)
         .filter((loco): loco is Locomotive => Boolean(loco)),
@@ -339,11 +342,11 @@ export class TrainBuilderService {
     };
   }
 
-  /** Replace the locomotive set (still minimum 2, same-yard rule applies). */
+  /** Replace the locomotive set (minimum 1, same-yard rule applies). */
   async setLocomotives(id: string, dto: UpdateTrainLocomotivesDto) {
     const locomotiveIds = [...new Set(dto.locomotiveIds)];
-    if (locomotiveIds.length < 2) {
-      throw new BadRequestException('A train must be pulled by at least two locomotives');
+    if (locomotiveIds.length < 1) {
+      throw new BadRequestException('A train must be pulled by at least one locomotive');
     }
     await this.dataSource.transaction(async (manager) => {
       const train = await this.getEditableTrain(manager, id);
@@ -360,7 +363,7 @@ export class TrainBuilderService {
         train.id,
       );
       await this.replaceLocomotiveLinks(manager, train.id, locomotiveIds);
-      const limits = minLocomotiveLimits(locomotives);
+      const limits = combinedLocomotiveLimits(locomotives);
       await manager
         .getRepository(Train)
         .update(train.id, { capacityTons: round(limits?.maxPullWeightTons ?? 0) });
@@ -520,6 +523,28 @@ export class TrainBuilderService {
         sequenceNumber: null,
         status: WagonStatus.Maintenance,
       });
+      // Audit row: which train it came off and when. The wagon does not change
+      // yard here, so from/to are the same — the ledger is the wagon's history
+      // surface, and a maintenance detach has to be in it.
+      const yardId = wagon.currentYardId ?? train.currentYardId ?? null;
+      if (yardId) {
+        await manager.getRepository(WagonMovement).save(
+          manager.getRepository(WagonMovement).create({
+            wagonId: wagon.id,
+            fromYardId: yardId,
+            toYardId: yardId,
+            kind: WagonMovementKind.Maintenance,
+            note: `Sent to maintenance from train ${train.trainNumber ?? train.code}`,
+            occurredAt: new Date(),
+          }),
+        );
+      } else {
+        // to_yard_id is NOT NULL — a yard-less wagon still goes to maintenance,
+        // it just cannot carry a ledger row.
+        this.logger.warn(
+          `Wagon ${wagon.wagonNumber} sent to maintenance with no yard — ledger row skipped`,
+        );
+      }
       await this.resequenceWagons(manager, train.id);
     });
     return this.getComposition(id);
@@ -743,7 +768,16 @@ export class TrainBuilderService {
       totalLengthMeters: round(
         wagons.reduce((sum, w) => sum + (Number(w.wagonType?.lengthMeters) || 0), 0),
       ),
-      maxPullWeightTons: round(train.capacityTons),
+      // Derived live from the coupled set, NOT from the stored capacity_tons.
+      // That column is written at build/re-couple time, so every train built
+      // before pull weight became additive still holds the old single-locomotive
+      // figure. Computing it here keeps the board honest without a backfill;
+      // the column self-heals the next time the locomotive set is saved.
+      maxPullWeightTons: round(
+        combinedLocomotiveLimits(locomotives)?.maxPullWeightTons ??
+          Number(train.capacityTons) ??
+          0,
+      ),
     };
   }
 
@@ -878,7 +912,7 @@ export class TrainBuilderService {
       where: { trainId: train.id },
       relations: { locomotive: true },
     });
-    const limits = minLocomotiveLimits(
+    const limits = combinedLocomotiveLimits(
       links
         .map((link) => link.locomotive)
         .filter((loco): loco is Locomotive => Boolean(loco)),