Chain-of-custody log: one row per Move Parts / Move Rack commit.
FP/MOVE/YYYY/NNNN sequence (5-digit). Carries from/to step + tank,
transfer type, qty, location, photo, rack, operator, datetime.
Child model captures recorded transition-input values (Sub 12a's
fp.step.template.transition.input snapshots → fp.job.step.move.
input.value rows). Each row carries 5 typed value columns; the
controller (Task 8) picks the right one based on input_type.
Operators get read+write+create — they generate moves at runtime —
but no unlink. Manager-only deletes for audit safety.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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