Move this server to trash before permanent deletion
Admin server delete with permanent: true returned 400 because the server is not already soft-deleted (deletedAt unset).
Why this happens
Two-step safety: trash first, then permanent purge. Active servers with files may also hit This server still has active files — transfer or delete them before permanent purge.
Diagnose and fix
1. Move the server to trash (non-permanent delete).
2. Clear or transfer remaining files if required.
3. From the Trash tab, permanently delete with the confirm word.
4. See Server trash, restore, purge. Local server cannot be deleted.