Values of exactly 0 are displayed as '-' in the spark-line on the site main page. The status code for the AQ5 at [COW2](https://monitormywatershed.org/sites/COW2/): <img width="524" height="450" alt="Image" src="https://github.com/user-attachments/assets/ab955ed2-8cad-48d9-b64e-5d101e574ac1" />
