the past-querying sounds a lot like reactive programming, doesn't it? you lay out an expression (and you would be typically using set/aggregate operations there

the past-querying sounds a lot like reactive programming, doesn't it? you lay out an expression (and you would be typically using set/aggregate operations there as well) and the expression kinda just sits there quietly, accumulates events until a certain condition or threshold is reached, when it fires a signal further down the chain...