fixes #33 vcr: use async queue to prevent races
fixes #33 vcr: use async queue to prevent races

Netsend/mastersync,Netsend/persdb,Netsend/mastersync,Netsend/PerspectiveDB,Netsend/persdb,Netsend/PerspectiveDB,Netsend/mastersync,Netsend/PerspectiveDB,Netsend/persdb