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Backup::Database class does not have config anymore since in gitlab it's now possible to configure many databases. We need now to get config from base_model: https://lab.nexedi.com/nexedi/gitlab-ce/-/blob/v15.11.13-nxd/lib/gitlab/database/each_database.rb#L39 If more than one databases gitlab can backup and restore them: https://lab.nexedi.com/nexedi/gitlab-ce/-/blob/v15.11.13-nxd/lib/backup/database.rb#L75 This feature is not supported for now. For our gitlab, we only use `main` database so base_model count is always 1. This patch will raise if there is more than one databases configured because gitlab-backup cannot handle it for now. /reviewed-by @jerome /reviewed-on !15
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