A lot of images and attachments went missing after xwiki upgrade.
However, after rebooting my machine, xwiki was magically fixed.
I guess something made PostgreSQL instance refuse to serve its
contents and restarting the instance solved the problem.
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I guess I need to upgrade my server since it is not suitable for 24/7 operation.
After running it for months, it almost always leads to various
hardware problems.
Also, I need to become a better system admin.
A while ago, /var became full, and RDBMS servers refused to write on /var.
I spotted the
