System unavailable after update to stable 4.6.1-0 Release

same root cause as in Upgrade to 5.0.1-0 from 4.6.1 rockstor fails

NAS001:~ # which pg_config
which: no pg_config in (/sbin:/usr/sbin:/usr/local/sbin:/root/.local/bin:/root/bin:/usr/local/bin:/usr/bin:/bin:/usr/lib/mit/bin:/usr/lib/mit/sbin)
NAS001:~ # zypper info postgresql13-server-devel
Retrieving repository 'Netdata Edge' metadata .......................................................................................................................................................................................[done]
Building repository 'Netdata Edge' cache ............................................................................................................................................................................................[done]
Retrieving repository 'repo-backports-update' metadata ..............................................................................................................................................................................[done]
Building repository 'repo-backports-update' cache ...................................................................................................................................................................................[done]
Retrieving repository 'repo-sle-update' metadata ....................................................................................................................................................................................[done]
Building repository 'repo-sle-update' cache .........................................................................................................................................................................................[done]
Loading repository data...
Reading installed packages...


Information for package postgresql13-server-devel:
--------------------------------------------------
Repository     : repo-sle-update
Name           : postgresql13-server-devel
Version        : 13.11-150200.5.40.1
Arch           : x86_64
Vendor         : SUSE LLC <https://www.suse.com/>
Installed Size : 6.0 MiB
Installed      : Yes (automatically)
Status         : up-to-date
Source package : postgresql13-13.11-150200.5.40.1.src
Upstream URL   : https://www.postgresql.org/
Summary        : PostgreSQL server development header files and utilities
Description    :
    PostgreSQL is an advanced object-relational database management system
    that supports an extended subset of the SQL standard, including
    transactions, foreign keys, subqueries, triggers, and user-defined
    types and functions.

    This package contains the header files and libraries needed to compile
    C extensions that link into the PostgreSQL server. For building client
    applications, see the postgresql13-devel package.