[Zope] Lost Objects after System Crash (Zope 2.1.5 on Win32)

Hello, I upgraded to Zope 2.1.5 (Win 32) Saturday and carried out changes in the database (eg. created new ZClasses, added ZClass instances, etc.) I had a nasty system crash (Win 95) around midnight Saturday. When I reopened Zope I realised the database was back to its 16:22 status: - All new objects had vanished. - The last transaction logged in the Undo list is dated about 16:22. - The very Data.fs in the filesystem is stamped 16:22 if you can believe it. I checked the Z2.log and it shows these missing changes. So I didn't dreamt doing them. I suppose these changes are lost? Cheers. Alexandre