This specific application looks pretty likely to use SQL.

https://docs.oracle.com/en/cloud/saas/financials/25a/fausf/m...

https://www.usaspending.gov/federal-spending-guide

> The USAspending SQL Database Downloads page includes instructions and links to help download snapshots of the USAspending database as a PostgreSQL archive. This resource is intended for advanced users. The full database is over 1.5 terabytes and will continue to increase in size. The process to complete a full database restore can take many hours to complete.