Just for clarity, full contents of file /etc/apt/sources.list.d/debian.sources in example above:
```
root@9925b7386ff9:/# cat /etc/apt/sources.list.d/debian.sources
Types: deb deb-src
# http://snapshot.debian.org/archive/debian/20251229T000000Z
URIs: http://deb.debian.org/debian
Suites: bookworm bookworm-updates
Components: main
Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
Types: deb deb-src
# http://snapshot.debian.org/archive/debian-security/20251229T000000Z
URIs: http://deb.debian.org/debian-security
Suites: bookworm-security
Components: main
Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
root@9925b7386ff9:/#
```
