fix build num

apps/edr-freight-web/backoffice/src/constants/trainRuns.ts

@@ -0,0 +1,35 @@
+/**
+ * EDR run-number pairs, keyed by the odd EXPORT run (Ethiopia → Djibouti). The
+ * even IMPORT run (Djibouti → Ethiopia) is fixed by the export run, so choosing
+ * an export number fully determines the import one.
+ *
+ * Run numbers are always 4 digits (8401, never 84001). Pairs are listed out
+ * rather than computed from the 8001/+100/+1 pattern, so a run that ever breaks
+ * the convention stays correct here.
+ *
+ * Mirrors RUN_WAGONS/IMPORT_RUN in the API's SeedWagonRunNumbers migration —
+ * keep the two in sync when runs are added or retired.
+ */
+export const TRAIN_RUN_PAIRS: Record<string, string> = {
+  "8001": "8002",
+  "8101": "8102",
+  "8201": "8202",
+  "8301": "8302",
+  "8401": "8402",
+  "8501": "8502",
+  "8601": "8602",
+  "8701": "8702",
+  "8801": "8802",
+  "8901": "8902",
+  "9001": "9002",
+};
+
+/** Selectable export runs, in run order. */
+export const EXPORT_TRAIN_OPTIONS = Object.keys(TRAIN_RUN_PAIRS).map((run) => ({
+  label: run,
+  value: run,
+}));
+
+/** The import run implied by an export run; empty string when unset/unknown. */
+export const importRunFor = (exportRun: unknown): string =>
+  TRAIN_RUN_PAIRS[String(exportRun ?? "")] ?? "";