def blank_histogram() -> dict:
    """Generate default dict for interface

    Returns:
        dict: Blank interface template
    """
    blank = {"ts": {}, "summary": {}}
    blank["day_of_week"] = {
        0: {"total": {}},
        1: {"total": {}},
        2: {"total": {}},
        3: {"total": {}},
        4: {"total": {}},
        5: {"total": {}},
        6: {"total": {}},
    }
    blank["hour_of_day"] = {}
    for hour in range(0, 24):
        blank["hour_of_day"][hour] = {}
        for day in range(0, 7):
            blank["day_of_week"][day][hour] = {}
    return blank