3 tables (kevin_signal_bridge_state, kevin_backtest_runs, kevin_backtest_trades) all UUID-keyed for consistency with Trade/Position. KEVIN_STRATEGY_UUID constant pinned for FK joins from Trade.strategy_id.
- shared/db.py: async engine + session factory - shared/models/base.py: DeclarativeBase + TimestampMixin - shared/models/trading.py: Strategy, Signal, Trade, Position, StrategyWeightHistory - shared/models/news.py: Article, ArticleSentiment - shared/models/learning.py: TradeOutcome, LearningAdjustment - shared/models/auth.py: User, UserCredential - shared/models/timeseries.py: MarketData, PortfolioSnapshot, StrategyMetric - Alembic async env.py with initial migration including TimescaleDB hypertables - 21 model tests covering enums, instantiation, metadata registration
