Disprove the obvious missing-record explanation — Open Investigation Notebook

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Illustrative input IDs A001..A010; export omits A003 and A006. Both have blank dates, but blank-date A009 is present. Thus 'all blank dates are dropped' conflicts with the observations. A conjunction involving another field remains possible. Compare missing and retained rows across fields and inspect rejection reasons. Open contribution: propose a query exposing the extra condition without sharing full records. Record exclusions and unknowns separately rather than filling missing rows with guesses.

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