Neither. If Richard's statements were facts they would violate his NDAs. In fact, these statements are falsehoods, and seem designed only to cause damage. Also, he's referring to 2016!
The only "problem" is that in 2016 I was physically assaulted at work, Richard had to leave work soon after, and has been denigrating my work since then. For example, here's a post from 2016, where it appears he had a multi-account conversation with himself:
https://news.ycombinator.com/item?id=13129798
Three years later, he's still unable to get over it and move on. This feels like a kind of twisted sexual investment, so I have chosen not to reply.
The Python eventsourcing library is excellent, and event sourcing is a great idea. The library is open source, so if Richard had discovered a bug that caused "corrupt data", he could have raised an issue on GitHub. But there hasn't been such a bug, and no such issue has been raised. Everybody can look through the mere 56 closed issues in the entire history of this successful project to see how many "corrupted data" bugs there have been (zero). https://github.com/johnbywater/eventsourcing/issues
The library is being used successfully in production. Some users have data stores with millions of stored domain events, and the library still works very fast. I didn't hear about anybody having billions of events yet, but I wouldn't expect much difference in performance, so long as the infrastructure has sufficient volume.
In case the wrong impression is created by listening to Richard's rubbish, SQL and event sourcing aren't somehow incompatible. Event sourcing isn't somehow the opposite of "regular databases". The library works very well with SQL databases, through both Django ORM and SQLAlchemy. It also works with NoSQL databases.
If you see posts like this in future, please ignore them, it's just fake news. My understanding is that Richard has diagnosed mental problems. But perhaps there's a kind of nominative determinism from the shortened version of his name? I don't know. At any rate, I've been keeping a log of these occasions, in case I need to call the police again.
Both. The library was slow and corrupted data and they were using regular databases along with the event-sourced stuff. That would never work, the whole system would have needed to be event sourced for it to have any chance of working.
It was essentially a CRUD app with the need for history of changes (for a few tables), SQL was the correct way to do it.
