Thanks for the patience so far. We are down to one left sstable file we need to repair, all other data is already imported back into the Cassandra database. The remaining file is rather large, so the import will then take a bit of time (maximum a few days), but after that, basically everything should be ready.
I will then have to do some further checks, to make sure that only very few entries were lost (the corrupted rows). If this is successful, it should be ready to be put back online. After putting it back online, in the background I will then do further checks (essentially going over ALL hashlists and check for each found if it's in the database) to identify the lost entries and being able to recover these.
Thank you for all the support and help offers I received so far. Looking forward to bring Hashes.org back to full service.