Docker Container install keeps old data even after complete deletion

Installation
1

I have installed home assistant in a docker container with the /config directory as a bind mount volume. I made a few configurations as a test and then wanted to start over with a fresh install. I tried to get rid of the configuration in various stages, none of which worked:

  1. stop container, delete volume, start container → data is still there
  2. stop container, delete volume, clear browser cache and browser data, start container → data is still there
  3. stop container, delete container, delete browser data, delete volume, recreate container → data is still there
  4. stop container, delete container, delete image, delete volume, delete browser data, restart Docker, recreate container with image pull, start container → data is still there

How do I get rid of the old data so that I can do a new onboarding? I have never experienced anything like this with Docker and am at the end of my tether.

2

SOLVED by myself. I just deleted the data within the volume without realizing there are hidden files. After deleting those I could onboard again. My Docker runs on a QNAP NAS and the FileStation (the file explorer) doesn’t show “hidden” files by default.