Design a photo library app that shows tens of thousands of photos in a grid and backs them up to the cloud. Focus on grid scroll performance: thumbnail generation, caching, and memory.
Device photos use PhotoKit (PHAsset) as the source, with PHCachingImageManager preheating and caching cell-size thumbnails. The app's own assets keep originals and thumbnails (2 or 3 sizes) in separate storage, draw the grid from a SQLite index, and cap the memory cache with NSCache byte costs.
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