Fix type checking errors in memory-leak-monitor.py

- Remove unused imports: json, Path, Tuple
- Fix type annotation for db_path parameter to use Optional[str]
- Addresses pyright type-check failures in CI

Co-Authored-By: Alex Peng <[email protected]>

Author: devin-ai-integration[bot]

scripts/memory-leak-monitor.py

@@ -10,15 +10,13 @@
 """
 
 import argparse
-import json
 import logging
 import os
 import re
 import sqlite3
 import sys
 from datetime import datetime
-from pathlib import Path
-from typing import Dict, List, Optional, Tuple
+from typing import Dict, List, Optional
 
 logger = logging.getLogger("memory-leak-monitor")
 
@@ -36,7 +34,7 @@
 class MemoryLeakMonitor:
     """Monitor memory usage and detect potential leaks."""
 
-    def __init__(self, db_path: str = None):
+    def __init__(self, db_path: Optional[str] = None):
         """
         Initialize memory leak monitor.