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I've had issues before where max_statement_time/max_execution_time could cause weird failures, but that SQL feature isn't being used.

I restored the thread* into SB's testing environment but I'm able to safely move posts out of that 26000 post thread. I'm planning to rebuild the testing environment off live in the next day or so, and then will re-import the thread.

*Script used to generate an SQL dump from an old backup is attached. This generates a ~100mb SQL file for that thread