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docs: update README with database schema and priority calculation strategy

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StirGpea 2026-08-21 11:32:25 +00:00
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# PieVR
## Database Schema & Core Concepts
- **Storage:** SQLite (`storage/` directory, ignored in `.gitignore`).
- **Tables:**
- `questions`: stores core question data (`id`, `type`, `question_text`, `payload` as JSON, `active`, `last_asked_at`, `streak`, `times_asked`, `times_correct`, `created_at`).
- `tags`: tags for granular and cross-cutting topic selection (`id`, `name`).
- `question_tags`: many-to-many relationship between questions and tags.
- **Priority & Spaced Repetition:** No hardcoded calendar intervals. Priorities and scheduling metrics are stored as raw counters (`streak`, `times_asked`, `last_asked_at`) in the database, while complex priority/decay formulas are calculated dynamically on the fly in Go.