refactor: enhance Optuna backtesting framework, optimize orderbook filtering, and update database management utilities.

scratch/check_ws_price_validation_4.py

@@ -0,0 +1,9 @@
+from database import TradeDB
+db = TradeDB()
+try:
+    sql = "SELECT * FROM ws_price_validation WHERE DATE(ts) = '2026-08-10' LIMIT 5"
+    rows = db.conn.execute(sql).fetchall()
+    for row in rows:
+        print(dict(row))
+finally:
+    db.close()