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It was an upgrade from a legacy system to its successor. I never used the legacy system so I don't know what checks they did. I suspect little to none; I guess they pretty much exposed the raw 'tables' to the user to insert whatever they wanted.

I wrote 'tables' because it wasn't a relational DB although the successor system was.

The amount of data was pretty minimal too, not much more than a dozen GB, but it ate up at least 4 man-years to convert. I still cringe thinking about it. Some parts were an interesting challenge but mostly just soul destroying grind.

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