Index-free: Drop last limbo free snapshot if re-upgraded #734
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schmidt-sebastian
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@schmidt-sebastian: The following tests failed, say
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If we don't want to backfill the read time, we need to ensure that all documents written after any last limbo free snapshot version need to already have a read time. Since that is not the case if a user downgrades, we should clear all limbo free snapshot versions when the user upgrades again.