how to increase session_history data rentention

Hello, do you know which is the site admin parameter to set to increase the data retention period of session_history table?

Basically I need to do historycal analysis on ALM usage, but unfortunately session_history has data up to 1 year old; I'd like to increase this threshold to more than one year, but I don't know which is the parameter to set (and I didn't find it in documentation)

thanks and kind regards,
Diego