Add paginated responses (items/total/skip/limit) to:
- GET /api/data/stocks/{ticker}/prices (default limit=365)
- GET /api/data/etfs/{ticker}/prices (default limit=365)
- GET /api/portfolios/{id}/snapshots (default limit=100)
- GET /api/portfolios/{id}/transactions (default limit=50)
Frontend: update snapshot/transaction consumers to handle new response
shape, add "Load more" button to transaction table.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Add realized_pnl column to transactions table with alembic migration
- Calculate realized PnL on sell transactions: (sell_price - avg_price) * quantity
- Show total realized/unrealized PnL in portfolio detail summary cards
- Show per-transaction realized PnL in transaction history table
- Add position sizing API endpoint (GET /portfolios/{id}/position-size)
- Show position sizing guide in signal execution modal for buy signals
- 8 new E2E tests, all 88 tests passing
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
