When you start processing data, incl. the data history, you find so many weird things that break your assumptions. Objects where a later version was created before the previous version. Empty tag keys or values…

@rory How are we getting time travel? We don't trust local time on the clients do we?

@InsertUser pre API 0.6, they had to fake changesets, so that's understandable. But there are weirdness like that post 0.6.

I have no idea how it happened

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