Previously, skill stats (attempts, correct, accuracy) were stored as
persisted aggregates in playerSkillMastery and updated incrementally.
This caused issues with seeded test data showing "0 correct".
Now:
- analyzeSkillPerformance() computes stats from session results on-the-fly
- findStrugglingSkills() computes accuracy from session results
- Seeder no longer needs to update aggregate columns
Benefits:
- Single source of truth (session results)
- No drift between aggregates and actual data
- Seeded data automatically works correctly
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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