SQLStreamStore VS Event Store

Database: SQL or Event Store. If SQL, One of https://fsprojects.github.io/SQLProvider/, https://github.com/Dzoukr/Dapper.FSharp or https://github.com/SQLStreamStore/SQLStreamStore

If you are using a relational database, and need pub sub, I would take a look at https://github.com/SQLStreamStore/SQLStreamStore. It supports MSSQL, MySQL, Postgres, and sqlite.

I've been doing some research and found this: https://github.com/EventStore/EventStore

C#: In Europe, Java is still strong but many trading firms use C# because of the strong Microsoft culture in Europe, as well as because of strongly supported C# libraries like say EventStore, which tends to be used for the matchmaking engines for stock exchanges (especially that exchange matchmaking problem is basically SMR). And skimming over the code, it has Paxos implemented too, making it good for dealing with partial failures (failover), essential for any HFT/trading firm. C#'s also the biggest ecosystem that many of the breakthrough java tech mentioned earlier was first ported to.

Support for eventstore.com eventstore. esdb

Where's the catch, then? Well, there's a couple of catches, in fact. First of all, in a distributed setting, appending data to a log isn't that easy. First, you need to make your log distributed. Again, Kafka/Cassandra/EventStore make this possible, however, whenever you start dealing with distributed data, you‘re introducing new operational and implementation complexity.