data not persistent

[airdogvan]

This is my docker-compose file:

version: "3"
services:
db:
image: mysql:8.0.13
container_name: db
command: --default-authentication-plugin=mysql_native_password
restart: always
env_file: .env
volumes:
- /etc/localtime:/etc/localtime:ro
- db-datavolume:/var/lib/mysql
- ./mysql:/etc/mysql/conf.d
ports:
- "3306:3306"

traccar:
    image: traccar/traccar:4.8-alpine
    container_name: traccar
    depends_on:
        - db
    restart: always
    volumes:
        - ./traccar/conf/traccar.xml:/opt/traccar/conf/traccar.xml:ro
        - /var/log/traccar:/opt/traccar/logs:rw
        - ./traccar/web/favicon.ico:/opt/traccar/web/favicon.ico:ro
        - ./traccar/web/icon.png:/opt/traccar/web/icon.png:ro
        - ./traccar/web/logo.svg:/opt/traccar/web/logo.svg:ro
        - ./traccar/web/release.html:/opt/traccar/web/release.html:ro
        - ./traccar/web/app.css:/opt/traccar/web/app.css:ro
    ports:
        - "5002-5150:5002-5150"
        - "8083:8082"

    volumes:
      - /var/run/docker.sock:/var/run/docker.sock

volumes:
db-datavolume:

When I do a docker-compose down
and then
docker-compose up
All the data (users, devices,etc.) disappears and I have to reenter it again.

Which I don't understand since there is a volume for the db.

Is there a routine in the traccar server that reinitializes the db every time it starts? Doesn't make sense to me.

Apart from that small detail everything runs fine.