Path.exists

name = project["full_name"]
        url = project["html_url"]
        default_branch = project["default_branch"]
        output_filename = re.sub(r"[^a-zA-Z0-9]+", "_", name) + ".zip"
        output_path = os.path.join(self.download_dir, output_filename)
        if os.path.exists(output_path):
            return output_filename
        time.sleep(60)
        rs = requests.get(f"{url}/archive/{default_branch}.zip", stream=True)
        rs.raise_for_status()
        with open(output_path, "wb") as fd:
            for chunk in rs.iter_content(chunk_size=8192):
                fd.write(chunk)
        return output_filename

    def download(self):
        metadata_path = os.path.join(self.download_dir, 'metadata.json')
        if os.path.exists(metadata_path):
            return

        os.path.exists(self.download_dir) or os.mkdir(self.download_dir)
        projects = list(self.github_search())
        metadata = dict()
        for i, project in enumerate(projects):
            log.info(f"Downloading {project['full_name']} ({i + 1} of {len(projects)})")

if not date:
        date = datetime.now().strftime("%Y-%m-%d")

    data_file = RESEARCH_DIR / f"collected_{date}.json"

    if not data_file.exists():
        return {"error": f"No data found for {date}"}

    try:
        with open(data_file) as f:
            return json.load(f)
    except Exception as e:
        return {"error": str(e)}

async def save_research_report(report: str, date: str | None = None) -> dict[str, Any]:
    """Save a research report.

    Args:
        report: The report content (markdown)
        date: Date in YYYY-MM-DD format (default: today)
    """
    if not date:
        date = datetime.now().strftime("%Y-%m-%d")