feat(CORE-001B): migrate overview and hedge math to unit types

app/services/alerts.py

@@ -4,6 +4,7 @@ from __future__ import annotations
 
 from typing import Mapping
 
+from app.domain.portfolio_math import build_alert_context
 from app.models.alerts import AlertEvent, AlertHistoryRepository, AlertStatus
 from app.models.portfolio import PortfolioConfig
 
@@ -15,22 +16,12 @@ def build_portfolio_alert_context(
     source: str,
     updated_at: str,
 ) -> dict[str, float | str]:
-    gold_units = float(config.gold_ounces or 0.0)
-    live_gold_value = gold_units * spot_price
-    loan_amount = float(config.loan_amount)
-    margin_call_ltv = float(config.margin_threshold)
-    return {
-        "spot_price": float(spot_price),
-        "gold_units": gold_units,
-        "gold_value": live_gold_value,
-        "loan_amount": loan_amount,
-        "ltv_ratio": loan_amount / live_gold_value if live_gold_value > 0 else 0.0,
-        "net_equity": live_gold_value - loan_amount,
-        "margin_call_ltv": margin_call_ltv,
-        "margin_call_price": loan_amount / (margin_call_ltv * gold_units) if gold_units > 0 else 0.0,
-        "quote_source": source,
-        "quote_updated_at": updated_at,
-    }
+    return build_alert_context(
+        config,
+        spot_price=spot_price,
+        source=source,
+        updated_at=updated_at,
+    )
 
 
 class AlertService: