Optimize signal read paths and enforce score invariants

app/services/rr_scanner_service.py

@@ -556,6 +556,9 @@ async def scan_all_tickers(
     result = await db.execute(select(Ticker).order_by(Ticker.symbol))
     tickers = list(result.scalars().all())
     total = len(tickers)
+    # Ranking, score refresh, and setup detection repeatedly read the same
+    # immutable OHLCV series during one scan. Scope the cache to this run only.
+    db.info["ohlcv_cache"] = {}
 
     # Rank the universe up front so each new setup carries both the residual
     # activation gate percentile and the promoted production ordering score.
@@ -582,7 +585,6 @@ async def scan_all_tickers(
 
                 await scoring_service.compute_all_dimensions(db, ticker.symbol)
                 await scoring_service.compute_composite_score(db, ticker.symbol)
-                await db.commit()
             except Exception:
                 logger.exception("Error refreshing scores for %s", ticker.symbol)
 
@@ -596,6 +598,11 @@ async def scan_all_tickers(
         except Exception:
             logger.exception("Error scanning ticker %s", ticker.symbol)
 
+    # scan_ticker commits successful setup writes. This final commit persists
+    # refreshed scores for tickers that produced no setup or hit a scan error.
+    await db.commit()
+
+    db.info.pop("ohlcv_cache", None)
     if progress_callback is not None and total:
         progress_callback(total, total, "")