mod_time = os.path.getmtime(path)
print(f'DEBUG pre-exists: {path} {mod_time}')
mtimes_to_paths[str(datetime.fromtimestamp(mod_time))] = path
mod_time = os.path.getmtime(path)
print(f'DEBUG pre-exists: {path} {mod_time}')
mtimes_to_paths[str(datetime.fromtimestamp(mod_time))] = path