Hi @zelterNN , thank you for reaching out!
You should be able to continue upgrading and using your self-hosted instance as you have been. A Postgres upgrade is independent from the Retool upgrade. Our docs still recommend PostgreSQL version 13 or later.
Our general guidance is that before you upgrade your Retool instance version, we recommend creating a backup of your Retool PostgreSQL database and copying and storing the ENCRYPTION_KEY environment variable (along with any other environment variables specific to your instance) in a secure place.
After following the deployment guide steps, we recommend manually testing the deployment to check if it was successful by referencing the [release notes]/docs/releases/index.mdx) to better understand what has changed and what to test.
For more information on the upgrade best practices, you can find a detailed guide here!