choijaewook ffada928f2 Add database layer with SQLite schema, ORM-style Database class, and tests ...

Implements Task 2: creates db/schema.sql with five tables (signals, trades,
positions, portfolio, settings) and indexes; data/db.py with a Database class
covering all CRUD operations; tests/test_db.py with 6 passing pytest tests.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-03-20 17:47:34 +09:00

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