Thanks for the reply. I would be very interested if you could point me towards any private companies providing these kind of database solutions. I am particularly interested in their story around concurrent ingestion + analytics workloads. This is a tricky problem that most existing works solve by either doing stupid things a la. having a single-version system, or by using lots of synchronization + complex version-friendly concurrent data structures. Solutions I have seen in academia are usually tested well below the 1TB of data range, and I don't imagine they scale to the kind of data sizes you mention.
The fact that the research is being done outside of academia and not being published is pretty sad imo. Hopefully those in the know decide to publish at least tech-reports/whitepapers once they have a share of the market.