upgrading from dbmail 3.0.2

hello there,

i'm currently in the process of upgrading dbmail from version 3.0.2

downloaded dbmail 3.1.17 from github

https://github.com/pjstevns/dbmail/tree/dbmail_3_1

and configure, make, make install all went fine.

now i'm a bit stuck with upgrading the mysql database.

i see the update script 3_0_2-3_1_0.mysql, which i'm pretty sure i have 
to run ;)

update_headervalue_01.mysql i don't have to run, as 
dbmail_headervalue.headervalue type is already set to text

but i also see:

fix_foreign_keys.mysql

do i need to run this?

also, after i did run all the .mysql scripts, do i then need to run 
dbmail-util script?
e.g. dbmail-util -by?

finally ... is dbmail 3.1.17 the stable version for production system?
or should i go with the newest version 3.2.3

thanks a lot for your help & a big thank you for such a nice piece of 
software, which i'm running on my server for many years without any 
major issues ;)

greetings
becki