BE: Build time missing on frontend

After #109 build time is gone.
Before:
<img width="412" alt="image" src="https://github.com/user-attachments/assets/4ce59af0-6083-4d01-92ab-15e61fdbec7f" />
After:
<img width="326" alt="image" src="https://github.com/user-attachments/assets/86500a38-f4f7-4deb-ba3d-3dcb1a5b713e" />
