At kcdc.info today, RobRich.org, taught me that adminer.org exists. It does Database management in a single PHP file.
It's nice that it has an Docker Official Image.
docker run -d -p 8080:8080 -v $(pwd):/dot adminer:standalone
It's really easy to use from within a docker compose file.
adminer:
image: adminer:standalone
depends_on:
- backend
ports:
- "8080:8080"
For sqlite, there is some hacking that needs to be done: https://www.adminer.org/en/password/