Elementary Question Regarding Flow Execution

I have done a number of searches and have not found execution data is stored. I know where the flows themselves are stored, but I cannot locate execution data on a flow. I can see those that are executing in the dashboard, but after they are complete, is the data regarding that execution of the flow lost?

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Conceptually, the data consists of messages (javascript objects) flowing down the virtual wires in the flow. If a node absorbs a message and does not pass it on then is discarded, though there may still be other copies of it flowing down other wires in the flow.

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