Unlimited History Instead of 3 Month

[mikhoul]

This issue is easy to change, what we concern is the impact on performance.
History database is fully loaded on browser startup.

Maybe having an option (with a warning) to choose how many months we want to keep in history.

The default would be 3 months like now but the user would be able to enter any number or forever but would be warned about some performance issues that could happen when selecting a high number.