Hi,
From your scm-server-0.log
(Unknown server host name 'server1sql'.)
And from your db-validator.log
Caused by: java.sql.SQLException: Unknown server host name 'server1'.
Can you confirm the name are correct for your SEPM server itself and your dedicated SQL server ?
In the meantime what you can also do is to run the SEPM Wizard to re-configure your SEPM settings and correct the information if anything is incorrect or missing and try to connect back to your SEPM console.
If it's still do not work, I would advise to perform a disaster recovery procedure if you do have a backup of your SEPM before this issue occurs.
All the steps are available on the article below.
=> https://support.symantec.com/en_US/article.TECH160736.html
Kind regards,
A. Wesker