{
  "title": "Missing null check on fetchone result",
  "description": "fetchone() returns None when no row matches; indexing row[0] then raises TypeError, crashing the caller.",
  "severity": "MEDIUM",
  "category": "logic",
  "findings": [
    {"file": "app.py", "trigger": "cursor fetchone row indexed without null check", "description": "TypeError crash when user_id not found", "severity": "MEDIUM", "classes": ["CWE-476", "CWE-754"]}
  ]
}