Added duration field to queue_logs table.

models/queue_log.go

@@ -7,6 +7,7 @@ type DBQueueLog struct {
 	ConversationId string    `gorm:"primaryKey"`
 	Start          time.Time `gorm:"index"`
 	End            time.Time `gorm:"index"`
+	Duration       float64
 	Result         string `gorm:"type:json"`
 }