At-most-once for Read Side Processor

[sebastian-alfers]

Currently if a Read Side Processors persists an event that gets rejected by the DB (e.g. by violating certain columns constraints) the stream restarts and tries again until manual resolution was applied.

This is probably the desired approach in most cases but it would be good to provide the option to continue the processor by skipping the failed event in case the users explicitly opts in for this approach.

[octonato]

Correct. That's available in Akka Projection. I guess the best option for Lagom users willing to have this functionality is to move to Akka Projections.