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How to implement a table working like a ring buffer
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I've been watching this thread and thought I would offer an observation from the cheap seats. You seem to be shot-gunning your approach to this problem. Whenever I do that, I leave holes in unexpected places.

I would suggest that you devise a set of test cases, especially paying attention to the boundary conditions (none, one, up to 7 if you are using hardcoded limits like 6) and the boundary values (less than, duplicates, greater than). Wouldn't take much effort to put a pretty exhaustive set of tests together and would pay bundles of time and energy down the pike.

My $0.02.
Doug