Hello Philip,
As you’ve correctly noticed, we consider the Timescale as one of our Supported Databases (as an extension to PostgreSQL ):
https://www.gooddata.com/docs/cloud/connect-data/create-data-sources/postgresql/
Because TimescaleDB is a PostgreSQL extension, you need to ensure you keep your underlying PotsgreSQL installation up to date. When you upgrade your TimescaleDB extension to a new version, always take the time to check if you need to also upgrade your PostgreSQL version. If you are running an older version of PostgreSQL, you need to upgrade it first, before you upgrade your TimescaleDB extension.