fix: calculate final holdings from actions instead of querying database

**Problem:**
Final positions showed empty holdings despite executing 15+ trades.
The issue persisted even after fixing the get_current_position_from_db query.

**Root Cause:**
At end of trading day, base_agent.py line 672 called
_get_current_portfolio_state() which queried the database for current
position. On the FIRST trading day, this query returns empty holdings
because there's no previous day's record.

**Why the Previous Fix Wasn't Enough:**
The previous fix (date < instead of date <=) correctly retrieves
STARTING position for subsequent days, but didn't address END-OF-DAY
position calculation, which needs to account for trades executed
during the current session.

**Solution:**
Added new method _calculate_final_position_from_actions() that:
1. Gets starting holdings from previous day (via get_starting_holdings)
2. Gets all actions from actions table for current trading day
3. Applies each buy/sell to calculate final state:
   - Buy: holdings[symbol] += qty, cash -= qty * price
   - Sell: holdings[symbol] -= qty, cash += qty * price
4. Returns accurate final holdings and cash

**Impact:**
- First trading day: Correctly saves all executed trades as final holdings
- Subsequent days: Final position reflects all trades from that day
- Holdings now persist correctly across all trading days

**Tests:**
- test_calculate_final_position_first_day_with_trades: 15 trades on first day
- test_calculate_final_position_with_previous_holdings: Multi-day scenario
- test_calculate_final_position_no_trades: No-trade edge case

All tests pass ✅

agent/base_agent/base_agent.py

@@ -319,6 +319,60 @@ class BaseAgent:
             print(f"⚠️ Could not get position from database: {e}")
             return {}, self.initial_cash
 
+    def _calculate_final_position_from_actions(
+        self,
+        trading_day_id: int,
+        starting_cash: float
+    ) -> tuple[Dict[str, int], float]:
+        """
+        Calculate final holdings and cash from starting position + actions.
+
+        This is the correct way to get end-of-day position: start with the
+        starting position and apply all trades from the actions table.
+
+        Args:
+            trading_day_id: The trading day ID
+            starting_cash: Cash at start of day
+
+        Returns:
+            (holdings_dict, final_cash) where holdings_dict maps symbol -> quantity
+        """
+        from api.database import Database
+
+        db = Database()
+
+        # 1. Get starting holdings (from previous day's ending)
+        starting_holdings_list = db.get_starting_holdings(trading_day_id)
+        holdings = {h["symbol"]: h["quantity"] for h in starting_holdings_list}
+
+        # 2. Initialize cash
+        cash = starting_cash
+
+        # 3. Get all actions for this trading day
+        actions = db.get_actions(trading_day_id)
+
+        # 4. Apply each action to calculate final state
+        for action in actions:
+            symbol = action["symbol"]
+            quantity = action["quantity"]
+            price = action["price"]
+            action_type = action["action_type"]
+
+            if action_type == "buy":
+                # Add to holdings
+                holdings[symbol] = holdings.get(symbol, 0) + quantity
+                # Deduct from cash
+                cash -= quantity * price
+
+            elif action_type == "sell":
+                # Remove from holdings
+                holdings[symbol] = holdings.get(symbol, 0) - quantity
+                # Add to cash
+                cash += quantity * price
+
+        # 5. Return final state
+        return holdings, cash
+
     def _calculate_portfolio_value(
         self,
         holdings: Dict[str, int],
@@ -614,8 +668,14 @@ Summary:"""
         summarizer = ReasoningSummarizer(model=self.model)
         summary = await summarizer.generate_summary(self.conversation_history)
 
-        # 8. Get current portfolio state from database
-        current_holdings, current_cash = self._get_current_portfolio_state(today_date, job_id)
+        # 8. Calculate final portfolio state from starting position + actions
+        # NOTE: We must calculate from actions, not query database, because:
+        # - On first day, database query returns empty (no previous day)
+        # - This method applies all trades to get accurate final state
+        current_holdings, current_cash = self._calculate_final_position_from_actions(
+            trading_day_id=trading_day_id,
+            starting_cash=starting_cash
+        )
 
         # 9. Save final holdings to database
         for symbol, quantity in current_holdings.items():

tests/unit/test_calculate_final_position.py

@@ -0,0 +1,219 @@
+"""Test _calculate_final_position_from_actions method."""
+
+import pytest
+from unittest.mock import patch
+from agent.base_agent.base_agent import BaseAgent
+from api.database import Database
+
+
+@pytest.fixture
+def test_db():
+    """Create test database with schema."""
+    db = Database(":memory:")
+
+    # Create jobs record
+    db.connection.execute("""
+        INSERT INTO jobs (job_id, config_path, status, date_range, models, created_at)
+        VALUES ('test-job', 'test.json', 'running', '2025-10-07 to 2025-10-07', 'gpt-5', '2025-10-07T00:00:00Z')
+    """)
+    db.connection.commit()
+
+    return db
+
+
+def test_calculate_final_position_first_day_with_trades(test_db):
+    """Test calculating final position on first trading day with multiple trades."""
+
+    # Create trading_day for first day
+    trading_day_id = test_db.create_trading_day(
+        job_id='test-job',
+        model='gpt-5',
+        date='2025-10-07',
+        starting_cash=10000.0,
+        starting_portfolio_value=10000.0,
+        daily_profit=0.0,
+        daily_return_pct=0.0,
+        ending_cash=10000.0,  # Not yet calculated
+        ending_portfolio_value=10000.0,  # Not yet calculated
+        days_since_last_trading=1
+    )
+
+    # Add 15 buy actions (matching your real data)
+    actions_data = [
+        ("MSFT", 3, 528.285, "buy"),
+        ("GOOGL", 6, 248.27, "buy"),
+        ("NVDA", 10, 186.23, "buy"),
+        ("LRCX", 6, 149.23, "buy"),
+        ("AVGO", 2, 337.025, "buy"),
+        ("AMZN", 5, 220.88, "buy"),
+        ("MSFT", 2, 528.285, "buy"),  # Additional MSFT
+        ("AMD", 4, 214.85, "buy"),
+        ("CRWD", 1, 497.0, "buy"),
+        ("QCOM", 4, 169.9, "buy"),
+        ("META", 1, 717.72, "buy"),
+        ("NVDA", 20, 186.23, "buy"),  # Additional NVDA
+        ("NVDA", 13, 186.23, "buy"),  # Additional NVDA
+        ("NVDA", 20, 186.23, "buy"),  # Additional NVDA
+        ("NVDA", 53, 186.23, "buy"),  # Additional NVDA
+    ]
+
+    for symbol, quantity, price, action_type in actions_data:
+        test_db.create_action(
+            trading_day_id=trading_day_id,
+            action_type=action_type,
+            symbol=symbol,
+            quantity=quantity,
+            price=price
+        )
+
+    test_db.connection.commit()
+
+    # Create BaseAgent instance
+    agent = BaseAgent(signature="gpt-5", basemodel="anthropic/claude-sonnet-4", stock_symbols=[])
+
+    # Mock Database() to return our test_db
+    with patch('api.database.Database', return_value=test_db):
+        # Calculate final position
+        holdings, cash = agent._calculate_final_position_from_actions(
+            trading_day_id=trading_day_id,
+            starting_cash=10000.0
+        )
+
+    # Verify holdings
+    assert holdings["MSFT"] == 5, f"Expected 5 MSFT (3+2) but got {holdings.get('MSFT', 0)}"
+    assert holdings["GOOGL"] == 6, f"Expected 6 GOOGL but got {holdings.get('GOOGL', 0)}"
+    assert holdings["NVDA"] == 116, f"Expected 116 NVDA (10+20+13+20+53) but got {holdings.get('NVDA', 0)}"
+    assert holdings["LRCX"] == 6, f"Expected 6 LRCX but got {holdings.get('LRCX', 0)}"
+    assert holdings["AVGO"] == 2, f"Expected 2 AVGO but got {holdings.get('AVGO', 0)}"
+    assert holdings["AMZN"] == 5, f"Expected 5 AMZN but got {holdings.get('AMZN', 0)}"
+    assert holdings["AMD"] == 4, f"Expected 4 AMD but got {holdings.get('AMD', 0)}"
+    assert holdings["CRWD"] == 1, f"Expected 1 CRWD but got {holdings.get('CRWD', 0)}"
+    assert holdings["QCOM"] == 4, f"Expected 4 QCOM but got {holdings.get('QCOM', 0)}"
+    assert holdings["META"] == 1, f"Expected 1 META but got {holdings.get('META', 0)}"
+
+    # Verify cash (should be less than starting)
+    assert cash < 10000.0, f"Cash should be less than $10,000 but got ${cash}"
+
+    # Calculate expected cash
+    total_spent = sum(qty * price for _, qty, price, _ in actions_data)
+    expected_cash = 10000.0 - total_spent
+    assert abs(cash - expected_cash) < 0.01, f"Expected cash ${expected_cash} but got ${cash}"
+
+
+def test_calculate_final_position_with_previous_holdings(test_db):
+    """Test calculating final position when starting with existing holdings."""
+
+    # Create day 1 with ending holdings
+    day1_id = test_db.create_trading_day(
+        job_id='test-job',
+        model='gpt-5',
+        date='2025-10-06',
+        starting_cash=10000.0,
+        starting_portfolio_value=10000.0,
+        daily_profit=0.0,
+        daily_return_pct=0.0,
+        ending_cash=8000.0,
+        ending_portfolio_value=9500.0,
+        days_since_last_trading=1
+    )
+
+    # Add day 1 ending holdings
+    test_db.create_holding(day1_id, "AAPL", 10)
+    test_db.create_holding(day1_id, "MSFT", 5)
+
+    # Create day 2
+    day2_id = test_db.create_trading_day(
+        job_id='test-job',
+        model='gpt-5',
+        date='2025-10-07',
+        starting_cash=8000.0,
+        starting_portfolio_value=9500.0,
+        daily_profit=0.0,
+        daily_return_pct=0.0,
+        ending_cash=8000.0,
+        ending_portfolio_value=9500.0,
+        days_since_last_trading=1
+    )
+
+    # Add day 2 actions (buy more AAPL, sell some MSFT)
+    test_db.create_action(day2_id, "buy", "AAPL", 5, 150.0)
+    test_db.create_action(day2_id, "sell", "MSFT", 2, 500.0)
+
+    test_db.connection.commit()
+
+    # Create BaseAgent instance
+    agent = BaseAgent(signature="gpt-5", basemodel="anthropic/claude-sonnet-4", stock_symbols=[])
+
+    # Mock Database() to return our test_db
+    with patch('api.database.Database', return_value=test_db):
+        # Calculate final position for day 2
+        holdings, cash = agent._calculate_final_position_from_actions(
+            trading_day_id=day2_id,
+            starting_cash=8000.0
+        )
+
+    # Verify holdings
+    assert holdings["AAPL"] == 15, f"Expected 15 AAPL (10+5) but got {holdings.get('AAPL', 0)}"
+    assert holdings["MSFT"] == 3, f"Expected 3 MSFT (5-2) but got {holdings.get('MSFT', 0)}"
+
+    # Verify cash
+    # Started: 8000
+    # Buy 5 AAPL @ 150 = -750
+    # Sell 2 MSFT @ 500 = +1000
+    # Final: 8000 - 750 + 1000 = 8250
+    expected_cash = 8000.0 - (5 * 150.0) + (2 * 500.0)
+    assert abs(cash - expected_cash) < 0.01, f"Expected cash ${expected_cash} but got ${cash}"
+
+
+def test_calculate_final_position_no_trades(test_db):
+    """Test calculating final position when no trades were executed."""
+
+    # Create day 1 with ending holdings
+    day1_id = test_db.create_trading_day(
+        job_id='test-job',
+        model='gpt-5',
+        date='2025-10-06',
+        starting_cash=10000.0,
+        starting_portfolio_value=10000.0,
+        daily_profit=0.0,
+        daily_return_pct=0.0,
+        ending_cash=9000.0,
+        ending_portfolio_value=10000.0,
+        days_since_last_trading=1
+    )
+
+    test_db.create_holding(day1_id, "AAPL", 10)
+
+    # Create day 2 with NO actions
+    day2_id = test_db.create_trading_day(
+        job_id='test-job',
+        model='gpt-5',
+        date='2025-10-07',
+        starting_cash=9000.0,
+        starting_portfolio_value=10000.0,
+        daily_profit=0.0,
+        daily_return_pct=0.0,
+        ending_cash=9000.0,
+        ending_portfolio_value=10000.0,
+        days_since_last_trading=1
+    )
+
+    # No actions added
+    test_db.connection.commit()
+
+    # Create BaseAgent instance
+    agent = BaseAgent(signature="gpt-5", basemodel="anthropic/claude-sonnet-4", stock_symbols=[])
+
+    # Mock Database() to return our test_db
+    with patch('api.database.Database', return_value=test_db):
+        # Calculate final position
+        holdings, cash = agent._calculate_final_position_from_actions(
+            trading_day_id=day2_id,
+            starting_cash=9000.0
+        )
+
+    # Verify holdings unchanged
+    assert holdings["AAPL"] == 10, f"Expected 10 AAPL but got {holdings.get('AAPL', 0)}"
+
+    # Verify cash unchanged
+    assert abs(cash - 9000.0) < 0.01, f"Expected cash $9000 but got ${cash}"