The World tension Index has now been implemented also on the mobile app, which is very useful. But if you look at the WTI itself, it can only show a 30 day trend. The trend data exists already for time periods before that and it would be beneficial to see it (if people wants to), to get a better context of how the overall world is doing. Ability to see 60/90 days would be a nice feature to have. If that is considered to be too anxiety triggering, then having the ability to see the WTI as a holistic picture from atleast the year start would be super useful. to get a glance about the state of the world.
Users with this feature can see a more holistic picture of the WTI, with the data that is already available. Even if some users might find the WTI anxiety inducing (which is why a toggle off/on switch is important), others who use this feature will benefit from reframing their perspective when we have days where WTI are high. This gives the ability to the user to see how the WTI fluctuates and how cycles repeat (and not to worry too much about it). The data is already available, the only feature required is a drop down list to select how many days WTI trend to view.
A good example of this kind of implementation can be seen on the SteamDB website, where you can look at player charts, prices, etc of a game over various period of time.

Edit : https://kagifeedback.org/d/9805-analysis-history-to-world-tension - This suggestion by the contributor, has the potential to be combined with the feature that I have suggested.