Description of problem: When satellite-sync pulls down kickstart trees from hosted, It defaults the last_modified date to the date it synced the trees. This has been the behavior since long. This becomes a problem with channel dump generation (for incremental dumps) as the date ranges no longer get validated for kickstart trees and pulls everything. For this satellite exporter should export last_modified field for kickstartTrees. Once it can do that we can fix sat-sync to insert the right date instead of default sync date.
Data is sent, but as last-modified rather than last_modified