is it possible to configure the update of database according the time ?

[eluser]PhilTem[/eluser]
It's possible in pure PHP so it's definitely possible in CI!

Either make CronJobs or put a model's method-call into MY_Controller which automatically deletes all old data (given you have a timestamp within the tables you want to delete data from).

Have you already tried something? Then post your code snippets so it's easier for use to help you