48-Hour Field Notes: I Replayed a Generated Migration Twice and the Row Counts Moved A generated backfill script looked clean in review on Monday morning, and by Wednesday it had already been applied twice against a staging copy of real shapes. The first pass rewrote 412,318 rows, and the second pass rewrote the same rows again on top of the result. Nobody had lost production data, but only because that staging database was scheduled to be destroyed that same afternoon. So I blocked two days...