[ovirt-users] General failure

Hi, We're running oVirt 4.1.9 (we cannot upgrade at this time) and we're having a major problem in our infrastructure. On friday, a snapshots were automatically created on more than 200 VMs and as this was just a test task, all of them were deleted at the same time, which seems to have corrupted several VMs. When trying to delete a snapshot on some of the VMs, a "General error" is thrown with a NullPointerException in the engine log (attached). But the worst part is that when some of these machines is powered off and then powered on, the VMs are corrupt... VM myvm is down with error. Exit message: Bad volume specification {u'index': 0, u'domainID': u'110ea376-d789-40a1-b9f6-6b40c31afe01', 'reqsize': '0', u'format': u'cow', u'bootOrder': u'1', u'address': {u'function': u'0x0', u'bus': u'0x00', u'domain': u'0x0000', u'type': u'pci', u'slot': u'0x06'}, u'volumeID': u'1fd0f9aa-6505-45d2-a17e-859bd5dd4290', 'apparentsize': '23622320128', u'imageID': u'65519220-68e1-462a-99b3-f0763c78eae2', u'discard': False, u'specParams': {}, u'readonly': u'false', u'iface': u'virtio', u'optional': u'false', u'deviceId': u'65519220-68e1-462a-99b3-f0763c78eae2', 'truesize': '23622320128', u'poolID': u'75bf8f48-970f-42bc-8596-f8ab6efb2b63', u'device': u'disk', u'shared': u'false', u'propagateErrors': u'off', u'type': u'disk'}. We're really frustrated by now and don't know how to procceed... We have a DB backup (with engine-backup) from thursday which would have a "sane" DB definition without all the snapshots, as they were all created on friday. Would it be safe to restore this backup? Any help is really appreciated... Thanks.