code: def migrate_big_urls(big_urls=BIG_URLS, inplace=True):
      r
      if not inplace:
          big_urls = deepcopy(big_urls)
      for name, meta in big_urls.items():
          big_urls[name] = dict(zip(range(len(meta)), meta))
          big_urls[name] = dict(zip(range(len(meta)), meta))
          # big_urls[name]['filenames'] = [normalize_ext(big_urls)]
      return big_urls
docs: r""" Migrate the big_urls table schema/structure from a dict of lists to a dict of dicts
  
      >>> big_urls = {'x': (1, 2, 3, "4x"), 'y': ("yme", "cause")}
      >>> inplace = migrate_big_urls(big_urls=big_urls)
      >>> inplace
      {'x': {0: 1, 1: 2, 2: 3, 3: '4x'}, 'y': {0: 'yme', 1: 'cause'}}
      >>> inplace is big_urls
      True
      >>> big_urls = {'x': [1, 2, 3, "4x"], 'y': ["yme", "cause"]}
      >>> copied = migrate_big_urls(big_urls=big_urls, inplace=False)
      >>> copied
      {'x': {0: 1, 1: 2, 2: 3, 3: '4x'}, 'y': {0: 'yme', 1: 'cause'}}
      >>> copied is big_urls
      False
      >>> copied['x'] is big_urls['x']
      False
      >>> 1 is copied['x'][0] is big_urls['x'][0]
      True