Today I can see the last 10 weeks history of my clan members in Clan War both in the UI and CSV downloaded.
Can we extend it to a longer period of weeks at least in the CSV option?
No. These came straight from Supercell and they only provide 10 weeks of data. We store older data but we can’t guarantee the data availability beyond what Supercell provides so we won’t be making that available as an option.
If we do, then even if we have 99% coverage of all the clans, we would get constant complaints from the 1% who don’t have those extra data, and we won’t be able to handle the volume of support requests that will likely pour in.