Same domain. I've come to the conclusion that these systems are dualistic in nature and the architecture needs to reflect that. I think the more general express

Same domain. I've come to the conclusion that these systems are dualistic in nature and the architecture needs to reflect that. I think the more general expression of this would be a time-series -> document-store pipeline. The concern then, if the time-series processing step requires domain data, is serving up fresh views of the evolving state in toto. That epsilon of temporal lag of 'current state' in the premier stage is a product issue. For some use cases it can be a very tight constraint, but I think quite a lot of others will be perfectly fine with snapshot isolation with generous requirement on freshness.