fix

apps/edr-freight-api/src/modules/first-mile/first-mile.service.ts

@@ -550,6 +550,34 @@ export class FirstMileService {
       previousVehicleIds.filter((id) => !vehicleIds.has(id)),
     );
 
+    // History: one event per vehicle actually added or removed by this
+    // multi-car (re)allocation, so reassignments show on every timeline.
+    const prevSet = new Set(previousVehicleIds);
+    const bookingRef = await this.resolveBookingRef(firstMile);
+    for (const vehicleId of vehicleIds) {
+      if (prevSet.has(vehicleId)) continue;
+      const info = await this.vehicleInfo(vehicleId);
+      await this.history.record({
+        eventType: FleetEventType.MILE_VEHICLE_ASSIGNED,
+        vehicleId,
+        firstMileId,
+        driverId: info.driverId,
+        label: firstMile.status,
+        metadata: { mile: 'FIRST', bookingRef, vehiclePlate: info.plate, driverName: info.driverName },
+      });
+    }
+    for (const vehicleId of previousVehicleIds) {
+      if (vehicleIds.has(vehicleId)) continue;
+      const info = await this.vehicleInfo(vehicleId);
+      await this.history.record({
+        eventType: FleetEventType.MILE_VEHICLE_RELEASED,
+        vehicleId,
+        firstMileId,
+        driverId: info.driverId,
+        metadata: { mile: 'FIRST', bookingRef, vehiclePlate: info.plate, driverName: info.driverName },
+      });
+    }
+
     return {
       success: true,
       allocated: allocations.length,