feat: publish mileage assessment freshness

src/server/routes/mileage/targets.ts

@@ -26,7 +26,8 @@ app.get('/', async (c) => {
         SUM(CASE WHEN current_year_completion_rate >= 0.5 THEN 1 ELSE 0 END) as half_qualified_count,
         SUM(current_year_mileage_task) as current_year_target,
         SUM(current_year_mileage) as current_year_completed,
-        MAX(current_year_assessment_end_date) as year_end_date
+        MAX(current_year_assessment_end_date) as year_end_date,
+        DATE_FORMAT(MAX(update_time), '%Y-%m-%dT%H:%i:%s+08:00') as snapshot_updated_at
       FROM lingniu_prod.tab_mileage_assessment_vehicle WHERE is_deleted = 0
       GROUP BY target_id
     `) as [any[], unknown];
@@ -199,6 +200,7 @@ app.get('/', async (c) => {
       return {
         id: t.id,
         targetName: t.target_name,
+        snapshotUpdatedAt: s.snapshot_updated_at || null,
         vehicleCount: Number(s.total) || t.vehicle_count,
         totalMileagePerVehicle: Number(t.total_mileage_per_vehicle),
         annualMileagePerVehicle: Number(t.annual_mileage_per_vehicle),