Postgres problem

Hi

When i first converted to using postgres with kde-pim i used postgres ver 9.6, 
i then upgraded a few times until i got to either ver 12 or 13 (just can't 
remember as i had various data conversion issues going any further).
Due to boot issues  i.e ending up in a grud cli, i've just had to upgrade 
using an Tumbleweed ISO as the Grub2-install wouldn't work.

Now trying to get postgres running so i can access my email on another 
account, it fiails to load saying "your database was created using 9.6, while 
it is true not sure how this is possible to still think this as i had upgraded 
to either 12 or 13.

What i'd like to be able to do is remove all history of the postgres database 
etc so i can rebuild the database from scratch using ver 16 as if its the first 
time.
The problem is that i don't know where to start, does anyone have any ideas?

regards

Ian



opensuse:tumbleweed:20231026
Qt: 5.15.11 KDE Frameworks: 5.111.0 - KDE Plasma:  5.27.9 - kwin 5.27.9
kmail2 5.24.2 (23.08.2) - akonadiserver 5.24.2 (23.08.2) - Kernel:  6.5.8-1-
default  - kernel-firmware-radeon  20231019