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fetch_face_pool was wiping 952 hand-classified rows when re-run from a Python without deepface installed (it reset every gender to None). Now: - Loads existing manifest by id and overlays only fetch-owned fields, so gender/race/age/excluded survive a refetch. - deepface pass tags only records that don't already have a gender; deepface unavailable means "leave existing tags alone" not "reset". - New --shrink flag required to drop ids >= --count. Default refuses to shrink the pool silently. - Atomic write via tmp + os.replace so an interrupted run can't corrupt the manifest. - Dedupes duplicate id lines (root cause of the 2497-row manifest backing a 1000-face pool). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>