Make live signal reads non-mutating

app/schemas/trade_setup.py

@@ -26,6 +26,14 @@ class RecommendationSummaryResponse(BaseModel):
     composite_score: float
 
 
+class TradeSetupContextAsOfResponse(BaseModel):
+    setup_detected_at: datetime
+    score_computed_at: datetime | None = None
+    sentiment_at: datetime | None = None
+    price_date: date | None = None
+    price_updated_at: datetime | None = None
+
+
 class TradeSetupResponse(BaseModel):
     """A single trade setup detected by the R:R scanner."""
 
@@ -49,4 +57,5 @@ class TradeSetupResponse(BaseModel):
     evaluated_at: datetime | None = None
     current_price: float | None = None
     momentum_percentile: float | None = None
+    context_as_of: TradeSetupContextAsOfResponse | None = None
     recommendation_summary: RecommendationSummaryResponse | None = None