graph: fix persistent backend when using transactions
graph: fix persistent backend when using transactions

lebauce/skydive,safchain/skydive,skydive-project/skydive,skydive-project/skydive,lebauce/skydive,skydive-project/skydive,safchain/skydive,lebauce/skydive,skydive-project/skydive,lebauce/skydive,lebauce/skydive,safchain/skydive,safchain/skydive,safchain/skydive,skydive-project/skydive,safchain/skydive,lebauce/skydive,safchain/skydive,lebauce/skydive,safchain/skydive,lebauce/skydive,skydive-project/skydive,skydive-project/skydive