Confluence will be unusable 23-July-2024 at 06:00 due to a Crowd upgrade.
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I think I found the location of the scripts which actually get called. It's highly protected, but copies of the files are available elsewhere for browsing. If I understand correctly, the production files also ultimately use the information in DBConf to connect, but it doesn't look too hard to make slightly-modified versions with different names which would use an alternate DBConf, pointing to mysql-node1 (and no doubt easier still for someone with experience with cgi scripts). We'd probably need help from unix-admin to install the modified scripts in the official location.
Update: unix-admin can install alternate cgi scripts to be invoked by an alternate SLAC-internal-only test web server. I've created the alternates and informed unix-admin they're ready to go.
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