upon reboot, windows decided to to do chkdks on the drive where the database is stored. there was an error in index and an orphan file was fixed.
"the disk is full error" still came up.
I run database integrity check. It took a while (more than 15 min) and didn't find anything spectacular other than few extra files with formats that were not listed in the database and removed them.
and now the error is gone! started and exited calibre twice to double check. I'll post if it'll show up again.
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