fix: code correctness, security, and simplicity improvements

cmd/cron/station_status.go

@@ -66,9 +66,11 @@ func checkStationSchedule(ctx context.Context, yc *yandex.Client, stationID stri
 }
 
 // updateStationStatus updates the station's status in cache based on trip count.
-// It returns the new status.
+// It returns the new status. Writes status and zero-days count separately;
+// partial failures may leave cache inconsistent but do not lose the core state.
 func (sm *StationMonitor) updateStationStatus(ctx context.Context, tripCount int) (Status, error) {
 	cacheKey := stationStatusKey(sm.ID)
+	zeroDaysKey := zeroDaysKey(sm.ID)
 
 	// Get current status from cache
 	data, err := sm.Cache.Get(ctx, cacheKey)
@@ -87,7 +89,6 @@ func (sm *StationMonitor) updateStationStatus(ctx context.Context, tripCount int
 	}
 
 	// Get current zero-trip day count
-	zeroDaysKey := zeroDaysKey(sm.ID)
 	zeroDaysData, err := sm.Cache.Get(ctx, zeroDaysKey)
 	var zeroDays int
 	if err != nil {