From your logs, it looks like the error occurs when the upgrader is trying to drop a table. Do you have the correct permissions assigned to your database user? Google search "confluence database [technology]" where [technology] = mysql, oracle, ms sql or postgres, depending on what you are using. Make sure you use all of the grants that are described. If you have a DBA managed database server, it wouldn't shock me if the DBA reduced the permissions once things were set up.
I don't see an obvious reason why it was marked as spam. My guess would be your URL to files.dm triggered it, but I can't see anything that states why it's marked as spam.
Sorry your post was marked as spam! Our system is often a little overzealous in trying to remove posts. We manually go through the spam queue on weekdays, but posts on Friday evenings/weekends might not get reviewed until Mondays. I've unmarked the question as spam and everyone should be able to see it now.
Looks like you have a starter license (10 users) right now. In order to open a ticket at support.atlassian.com, you'd need to bump up to the 25 user license. We support starter licenses exclusively through Community.
I have sent your thread over to a teammate to review soon. I see that another Community member has been helping troubleshoot already but Atlassian Support may jump in if we see something.
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