Error: "Your project has exceeded the written data quota." Despite being below DB storage limit

When deploying my Spring Boot app, deployment fails with the below error.

org.postgresql.util.PSQLException: ERROR: Your project has exceeded the written data quota. Upgrade your plan to increase limits.

As I understand it, this would mean my database has exceeded the storage limit. However, I’ve only used 625 MB of the 1 GB allotted.

Is there a daily database write limit that I’m unaware of or am I missing something else?