from data.database import Image, ImageStorage

query = ImageStorage.select().annotate(Image)

saved_bytes = 0
total_bytes = 0

for storage in query:
  if storage.image_size is not None:
    saved_bytes += (storage.count - 1) * storage.image_size
    total_bytes += storage.count * storage.image_size

print "Saved: %s" % saved_bytes
print "Total: %s" % total_bytes