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

scratch/check_ws_ob2.py

@@ -0,0 +1,10 @@
+from database import TradeDB
+db = TradeDB()
+try:
+    sql = "SELECT source, COUNT(*) as cnt FROM ws_orderbook WHERE DATE(recv_ts) = '2026-08-10' GROUP BY source"
+    rows = db.conn.execute(sql).fetchall()
+    print("OB COUNT:", [dict(r) for r in rows])
+except Exception as e:
+    print(f"ERROR: {e}")
+finally:
+    db.close()