Aennor's art collection, I deduplicated them manually and removed some SFW ones, then renamed and sorted them in reverse time order (newest-oldest).
The latest Real-ESRGAN image restoration model was used to upscale (4.0x, as the training model was designed for) and restore (denoise, remove JPEG artifacts) the image.
The Real-ESRGAN took about 9 hours to crunch down all 500+ images on my machine.
All uploaded pics were compressed with lossless PNG format, in compression level 9.