Optimize signal read paths and enforce score invariants

app/services/price_service.py

@@ -3,9 +3,9 @@
 from datetime import date, datetime
 
 from sqlalchemy import select
-from sqlalchemy.dialects.postgresql import insert as pg_insert
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from app.database import insert_for_session
 from app.exceptions import NotFoundError, ValidationError
 from app.models.ohlcv import OHLCVRecord
 from app.models.ticker import Ticker
@@ -53,7 +53,7 @@ async def upsert_ohlcv(
     _validate_ohlcv(high, low, open_, close, volume, record_date)
     ticker = await _get_ticker(db, symbol)
 
-    stmt = pg_insert(OHLCVRecord).values(
+    stmt = insert_for_session(db, OHLCVRecord).values(
         ticker_id=ticker.id,
         date=record_date,
         open=open_,
@@ -64,7 +64,7 @@ async def upsert_ohlcv(
         created_at=datetime.utcnow(),
     )
     stmt = stmt.on_conflict_do_update(
-        constraint="uq_ohlcv_ticker_date",
+        index_elements=["ticker_id", "date"],
         set_={
             "open": stmt.excluded.open,
             "high": stmt.excluded.high,