How to access postgres after installing onpremise sentry 10?

I have isntalled Sentry’s onpremise version on my server. During installation I did not setup postgres username/password by myself (installation must have done by itself). So, if I want to change user/password for sentry to access in that database, how do I create a user for that in postgres? How do I access data in postgres that sentry has stored?

Since I am new to docker, these might sound very basic questions but any help is appreciated.

Postgres instance is automatically set up via docker-compose. If you really need to access it or do some changes, you can do so inside the docker-compose.yml file under the postgres service config.

The database configuration for Sentry is defined here:

So you can go there and change any setting you need to such as a username and password.