**Problem:** Goals created today had start_value = current_value,
showing 0% progress even after months of tracking.
**Solution:**
1. Added start_date and start_value to GoalCreate/GoalUpdate models
2. New function _get_historical_value_for_goal_type():
- Queries source table for value on specific date
- ±7 day window for closest match
- Works with all goal types via goal_type_definitions
3. create_goal() logic:
- If start_date < today → auto-populate from historical data
- If start_date = today → use current value
- User can override start_value manually
4. update_goal() logic:
- Changing start_date recalculates start_value
- Can manually override start_value
**Example:**
- Goal created today with start_date = 3 months ago
- System finds weight on that date (88 kg)
- Current weight: 85.2 kg, Target: 82 kg
- Progress: (85.2 - 88) / (82 - 88) = 47% ✓
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Lars
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