Clojurians Log v2

attribute predicates were applied on retractions too? or what was the issue here?

Yes, they were applied on retractions too, mostly

what problems did it cause?

If you have existing data that violates a predicate, you can’t add the predicate you want and then get rid of bad data. You have to either compromise the predicate to fit the bad data you have (possibly allowing new bad data); or you have to get rid of the bad data first, install the predicate, then check your data again (retractions of bad data may fail in the meantime), and possibly remove the predicate and repeat.

got it, thx

I wonder why they didn't took the approach of "all data must satisfy the predicate before the attribute predicate can be added".

That would be a (potentially long) blocking transaction

If you don't mind, besides HA, does clubhouse runs more than one transactor to serve customers?

only one, for now. We’re working on sharding.