rob05c commented on issue #2098: Add TO deleted columns URL: https://github.com/apache/incubator-trafficcontrol/pull/2098#issuecomment-379871646 @limited We have some designs, specifically around the Snapshot-Queue automation problem, which is what this is "prepping" for. But they're pretty complex. In a nutshell, the plan is to use timestamp history to solve the Snapshot-Queue problem. So, for this PR, `deleted` columns become necessary to preserve previous state (for caches or routers that haven't got the latest yet), while still indicating an object (server/ds/etc) now no longer exists. There's a talk scheduled at the TC Summit in a few weeks, we were hoping to have the talk where people can ask questions and have concerns addressed more efficiently, and then post it to the mailing list, to hopefully reduce the back-and-forth and misunderstandings from discussing something so complex via email. This "prep" stuff I was hoping to get started in the next couple weeks will all be backwards-compatible. The entire thing is, it doesn't change the existing API (though it does eventually add a few new endpoints).
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