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- I2: Add TODO comment block + stub button_pause/button_skip/ button_cancel that raise NotImplementedError. Makes the missing state-machine paths explicit instead of invisible gaps. Future Task 1.6 wires the real implementations; shop-floor buttons in Task 1.8 can already point to the right method names. - I3: button_finish now preserves first-finish audit timestamp via 'if not step.date_finished:' guard, mirroring button_start. Future rework flow that re-opens a step won't lose the original finish data. The duration_actual rollup landing in Task 1.7 will use timelog rows for the most-recent interval if needed. - I4: step_count and step_done_count are now store=True so list views and stat buttons (Task 1.8) don't recompute across all job rows on every render. step_progress_pct and current_step_id stay non-stored - they're cheap derivatives. Split compute methods so stored + non-stored fields don't share one method (Odoo flags the mix as inconsistent and recomputes stored fields whenever the non-stored one is read, defeating the perf gain). Manifest 19.0.8.4.0 -> 19.0.8.4.1. Part of: native job model migration (spec 2026-04-25) Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>