Package: postgresql
Version: 11+200+deb10u1
Severity: grave
Justification: causes non-serious data loss

Dear Maintainer,

After updating to Debian Buster and postgresql 11 I purged all
postgresql 9.6 packages. Because of this all databases that were in the
data directory specified unser data_directory to be deleted without any
warning. This is not what I expected to happen and lead to data loss.
Apt help message and man page says only that config files are removed,
what I wanted to happen, but says nothing about data. When purging other
packages like mysql-server/mariadb-server the user is asked whether he
wants data to be removed or not. I made an update of MariaDB and other
server software some time ago and got that question, so I expected
PostgreSQL to also show it to me, but that didn't happen.

If it is normal behaviour for packages to remove data when purged, I
think that it should be clearly stated in the help and man. Since it
isn't and other packages don't do that, I think that it is a very
serious issue with the postgresql package.

Michel Le Bihan

-- System Information:
Debian Release: 10.0
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-7-amd64 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), 
LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages postgresql depends on:
ii  postgresql-11  11.4-1

postgresql recommends no packages.

Versions of packages postgresql suggests:
pn  postgresql-doc  <none>

-- no debconf information

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