As for lost personal details - on the several occasions it happened to me I noticed that my certs no longer appeared on my personal page, but were still applied in the trust metric (I was still a journeyer, despite no certs being shown on my page). IIRC the certs you've received are denormalised on your personal record, but as long as the person who gave you that cert hasn't been wiped the trust graph will still use that cert. Or something like that, I haven't looked at mod_virgule for years. I've recorded some observations on lost accounts in the diaries for redi and returnoftheredi