Installing and upgrading help

Wouldn't hurt to check would it?
Using the mysql client, logged onto the DB server using the creds in config.php:

SHOW GRANTS FOR '<user>'@'<host>';

Your host is probably localhost.

in code/admin/cli/

php uninstall_plugins.php --show-all
php uninstall_plugins.php  --show-contrib
php uninstall_plugins.php  --show-missing
php uninstall_plugins.php  --purge-missing --run

php uninstall_plugins.php  --plugins=[shortnameofplugin],[shortnameofotherplugin]
above is dry run
To actually remove:
php uninstall_plugins.php  --plugins=mod_assignment --run

That script has the ability to remove tables but you must also manually remove related directories in code directory.

Think I'd try removal of the 'health' ... that has been removed from core and now available as an addon.

'SoS', Ken

One other suggestion ... doesn't hurt to have some sort of panel - even if you don't use it often.
Linux based ... there is a free panel that has been around for years and runs under Perl ... Webmin.

https://webmin.com/

'SoS', Ken

@PIotr
Select all (that grants all) in that pick list.

You've kinda exposed too much about your DB setup.  Next time make screen clips.

You might want to look over:
https://docs.moodle.org/403/en/MariaDB

That moodle@localhost shows 'hosts' ANY.
You don't need any DB's that allow other hosts other than localhost.

Using Webmin, you can schedule daily SQL dumps of all the DB's and direct those dumps to a directory on your server.   Advise doing that.

I would, however, make db dumps just prior to updating core or updating any plugins you have installed in the moodle from command line.

bu script right inside moodle code:
# 4.1.9+ (Build: 20240326)'
tar -cvf /mnt/data/backup/mdlandcli/mdlandcli-code-419+-$(date +%Y%m%d%-H%M%S).tar ../mdlandcli;
tar -cvf /mnt/data/backup/mdlandcli/mdlandcli-data-min-419+-$(date +%Y%m%d%-H%M%S).tar /var/www/mdlandclidata/filedir /var/www/mdlandclidata/dkim;
mysqldump -u root -p'' mdlandcli > /mnt/data/backup/mdlandcli/mdlandcli-419+-db-$(date +%Y%m%d%-H%M%S).sql;
ls -l /mnt/data/backup/mdlandcli;
df -h;
du -h /mnt/data/backup/mdlandcli/

Adjust above to your setup when it comes to paths/where to save.

And another item suggested install ... MySQLtuner - a perl script.
Run with root privs.
Read the recommendations for fine tuning your DB server.

You also need to check the host DB ... you only need localhost.

'SoS', Ken