Add snapshot of booking-window rules to train schedules and update related logic

apps/edr-freight-api/src/modules/train-scheduling/booking-batch.service.ts

@@ -719,11 +719,34 @@ export class BookingBatchService implements OnModuleInit {
 
     const loco = s.trainSet?.locomotive ?? null;
 
-    // Display windows are the REAL booking-window cycles from the global-rules
-    // config (import: opens at windowOpenHour EAT importWindowLeadDays before
-    // departure, lasts windowDurationHours, reopens per reopenDelayMinutes;
-    // export: single FCFS lead window) — not a fixed clock grid.
-    const windowCfg = await this.trainSchedulingService.getWindowConfig();
+    // Display windows are the REAL booking-window cycles this schedule was FROZEN
+    // with at creation (import: opens at its stored window time, lasts its rule's
+    // duration, reopens per its rule's delay; export: single FCFS lead window) —
+    // NOT the live global config. A later global-rules edit only re-derives
+    // not-yet-open schedules (restampPendingWindows), so an already-open schedule
+    // must keep drawing from its own snapshot, anchored on its stored open time.
+    // Legacy rows with no snapshot fall back to the live config.
+    const liveCfg = await this.trainSchedulingService.getWindowConfig();
+    const num = (v: unknown, fallback: number) => {
+      const n = v == null ? NaN : Number(v);
+      return Number.isFinite(n) ? n : fallback;
+    };
+    const windowCfg = {
+      windowOpenHour: num(s.ruleWindowOpenHour, liveCfg.windowOpenHour),
+      windowDurationHours: num(
+        s.ruleWindowDurationHours,
+        liveCfg.windowDurationHours,
+      ),
+      reopenDelayMinutes: num(s.ruleReopenDelayMinutes, liveCfg.reopenDelayMinutes),
+      importWindowLeadDays: num(
+        s.ruleImportWindowLeadDays,
+        liveCfg.importWindowLeadDays,
+      ),
+      exportBookingLeadHours: num(
+        s.ruleExportBookingLeadHours,
+        liveCfg.exportBookingLeadHours,
+      ),
+    };
     const departureDate = s.scheduledDepartureDate ?? new Date();
     const windowBuckets = groupBookingsIntoBoardWindows(
       items,
@@ -731,6 +754,8 @@ export class BookingBatchService implements OnModuleInit {
       s.direction ?? null,
       departureDate,
       windowCfg,
+      undefined,
+      s.windowOpensAt ?? null,
     );
 
     const emptyCounts = () => ({