Migration from discourse v2.8.13 (on Ubuntu 20.04.6 LTS) to latest

Key (username_lower)=(philippe) already exists.

:warning: Take a Full backup before trying to fix anything as there is a risk that you might end up breaking it even more.

There are a few topics that provide guidance on how to deal with duplication errors (you basically have to find and delete the duplicates before proceeding)

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