@magnusart custom serialization
is supported but still stored as blob in Cassandra. Instead of writing additional columns in the primary log tables, I'd rather transform the log into something you can use for debugging. There's no special support for that yet but you could do that on Cassandra-level directly (using the Spark Cassandra connector, for example) or use the replication API
for batch-reading messages from an event log. In any case, creating the transformed log should run in the background. I won't be able to work on it right now because of other priorities but it would be great to see a pull request if you're interested.