- src/db/index.ts: initDb/getDb/closeDb using node-sqlite3-wasm (pure WASM, no VS build required)
- src/db/migrations/001-initial.ts: creates all 9 tables with FK constraints and CHECK constraints
- tests/db.test.ts: 10 tests verifying WAL mode, FK cascade, all table columns, and constraint enforcement
- Switched from better-sqlite3 (requires Visual Studio on Windows) to node-sqlite3-wasm
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
