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

scratch/find_div_diff.py

@@ -0,0 +1,15 @@
+with open('templates/backtest.html', 'r', encoding='utf-8') as f:
+    lines = f.readlines()
+
+count = 0
+for i, line in enumerate(lines):
+    if i < 490: continue
+    if i > 816: break
+    
+    opens = line.count('<div')
+    closes = line.count('</div')
+    count += (opens - closes)
+    if opens != closes:
+        print(f"L{i+1} (net {opens-closes}, total {count}): {line.strip()}")
+
+print(f"Final count: {count}")