delete the merkle roots on old contracts in a contract line
delete the merkle roots on old contracts in a contract line

ericflo/Sia,mtlynch/Sia,mharkus/Sia,mtlynch/Sia,mharkus/Sia,NebulousLabs/Sia,ericflo/Sia,NebulousLabs/Sia,ChrisSchinnerl/Sia,ChrisSchinnerl/Sia