Salida:
PHP Warning:  fopen(../historial_csv/historial_4935_12.csv): Failed to open stream: No such file or directory in /var/www/b02y.com/html/xxx/test/exportar_historial.php on line 16
❌ No se pudo crear el archivo.
Salida:
PHP Warning:  fopen(../historial_csv/historial_4936_22.csv): Failed to open stream: No such file or directory in /var/www/b02y.com/html/xxx/test/exportar_historial.php on line 16
❌ No se pudo crear el archivo.
Salida:
✅ Exportado: historial_4937_17.csv
Salida:
✅ Exportado: historial_4938_7.csv