import sqlite3
    import http.cookies
    import os

    # Ensure the session_id is properly parsed
    cookie = http.cookies.SimpleCookie(os.environ.get('HTTP_COOKIE', ''))
    session_id = cookie.get('session_id')

    if session_id:
        session_id = session_id.value
    else:
        session_id = None

    # Log the session ID for debugging
    with open("/tmp/user_panel_session.log", "a") as f:
        f.write(f"Parsed session ID: {session_id}\n")

    if session_id:
        session_id = session_id.value
        # Connect to SQLite and check the session
        db = sqlite3.connect('/var/lib/monotreme/data/monotreme.db')
        cursor = db.cursor()

        # Check if the session exists and is still valid
        cursor.execute("SELECT username FROM sessions WHERE session_id=? AND expires_at > ?", (session_id, int(time.time())))
        result = cursor.fetchone()

        if result:
            username = result[0]
            print(f"<h1>Welcome, {username}!</h1>")
            print("<p>This is your user panel.</p>")
            print("<p>Here, for now, you can only log out.</p>")
            print("<a href='/cgi-bin/logout.cgi'>Log out</a>")
        else:
            print("<h1>Session expired or invalid!</h1>")
            print("<a href='/login/'>Login again</a>")
    else:
        print("<h1>No session found!</h1>")
        print("<a href='/login/'>Login again</a>")