[persist] Relax assertions on the since in unflatten #33855
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ggevay
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bkirwi
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h/t to Dov for spotting the issue... we don't diff thin spine batches the way we ought to, which means that even correct diffs will allow the list of batches to get out of sync.
DAlperin
approved these changes
Oct 15, 2025
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h/t to Dov for discovering why this can happen... we don't compare thin spine batches in a lawful way. That's another thing to fix, but in the meanwhile this is safe and should avoid some CI issues.
Motivation
https://github.com/MaterializeInc/database-issues/issues/9795