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Goals can now choose between milestone-based progress (existing) and cumulative checkin-based progress (new). Cumulative mode supports cross-unit conversion (e.g. kcal → g fat) via a configurable conversion rate. New GoalCheckin model stores daily inputs; progress auto-recalculates on every checkin C/U/D. Backup import/export covers the new table. Frontend GoalDialog, GoalDetailPage and GoalPage cards adapt to show cumulative progress or milestone progress based on track_type. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>