All event data, like frags, connects, player actions etc. are stored into the DB. Since those informations can get very big we have the DeleteDays setting. This setting sets the maximum of days those events are stored into the DB. The Default are 5 days. Which means that the event data will be removed if they are older then 5 days. Setting DeleteDays to 0 (zero) no data will be deleted. This is not recommended for productive use. Use it only if you know what you are doing, since HLStats can get slow with this amount of data. And most rent-webspace or game server are not configured for this amount of data, which can a lot on active servers !