When building an Event Sourcing system, can we change the past? Can we also forecast “events” in the future?
If we want to provide various projections/visions of things that hapenned over the time, what are the consequences and trade-offs on our code?
All these questions will be answered during this talk. But moreover, I'll tell you our learning story about Bi-temporal Event Sourcing. Yet another illustration of the power of modeling, sketches and concrete examples when we need to understand each others.