At this level
at.meme-museum ยท 3- at.meme-museum.collection record A named board/folder of memes, e.g. "reactions" or "cat pics". Membership is recorded separately via at.meme-museum.collectionItem, not inline here.
- at.meme-museum.collectionItem record Membership of one meme in one collection. One record per (collection, meme) pair, mirroring the app.bsky.graph.list/listitem split rather than an inline member array -- see docs/data-model.md.
- at.meme-museum.meme record A single meme asset (still image, animated image, or short video clip) in a user's library.