Added duration field to queue_logs table.

models/queue_log.go

@@ -7,7 +7,8 @@ type DBQueueLog struct {
 	ConversationId string    `gorm:"primaryKey"`
 	Start          time.Time `gorm:"index"`
 	End            time.Time `gorm:"index"`
-	Result         string    `gorm:"type:json"`
+	Duration       float64
+	Result         string `gorm:"type:json"`
 }
 
 func (DBQueueLog) TableName() string {