Make sure attempts can be deserialized from db on startup (#410)

common/types/db.go

@@ -162,7 +162,7 @@ type SessionInfo struct {
 	ID             string                   `json:"id"`
 	Rollers        map[string]*RollerStatus `json:"rollers"`
 	StartTimestamp int64                    `json:"start_timestamp"`
-	Attempts       uint8                    `json:"attempts"`
+	Attempts       uint8                    `json:"attempts,omitempty"`
 }
 
 // ProvingStatus block_batch proving_status (unassigned, assigned, proved, verified, submitted)

common/version/version.go

@@ -5,7 +5,7 @@ import (
 	"runtime/debug"
 )
 
-var tag = "v3.0.5"
+var tag = "v3.0.6"
 
 var commit = func() string {
 	if info, ok := debug.ReadBuildInfo(); ok {