Do you have a backup of the keys?
--MP
No, only wallet dat.. on start zcashd rename it to wallet.1477707594.bak and exit

lol
this may be a serious bug but I finally made recovery:
1. compiled BDB version 6.2 and did a dump of wallet.dat
2. on separate machine i installed db-util ver 5.3 and loaded the dump
3. started daemon with -salvagewallet
Ok, try later, it's not fast