Hi Endre, can you please give us an example of where this happened? Ascents and routes are separate, so even after two routes get merged, what shows up in each climbers logbook and in the ascent list of that route should not change. The only thing that might have changed, is the "default" grade of the route, however that should not make the history less transparent. Thank you.
Great!
Then I was mistaken :)
Now that routes are merged, tick lists have been changed.
So if a route was X grade 2000-2008, but got up/downgraded to Y grade in 2009.
Earlier one could see this by the ticks. Now that history is deleted from the site.
And people that did the X grade route back in the day and ticked it as X, now have a Y grade on that route...