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

scratch/check_db.py

@@ -0,0 +1,4 @@
+from kis_trader.database.db_manager import TradeDBExt
+db = TradeDBExt()
+cols = [r['Field'] for r in db.conn.execute('SHOW COLUMNS FROM env_config').fetchall()]
+print([c for c in cols if 'SOURCE' in c or 'PROVIDER' in c])