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

scratch/check_ws_ob3.py

@@ -0,0 +1,9 @@
+from database import TradeDB
+db = TradeDB()
+try:
+    cnt = db.conn.execute("SELECT COUNT(*) as cnt FROM ws_orderbook").fetchone()['cnt']
+    print(f"Total ws_orderbook rows: {cnt}")
+except Exception as e:
+    print(f"ERROR: {e}")
+finally:
+    db.close()