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Jamie PineandClaude Opus 5
ed782078f4
The hot cache is raw BGRA and disposable, so nothing durable held a tile: a wiped cache meant decoding every original again, and a replica could only show a peer's thumbnails while that peer was awake to send them. Every tile baked now also goes into its source's sidecars.db as WebP, 5 to 15 KB against around 300 KB in the cache, keyed by record uuid and tile version. Content hashes would have deduped copies, but a content id is re-derived when a full hash lands, which would orphan anything keyed by it. The cache refills from a sidecar at the current version instead of baking; a forced bake still reads the file. thumbs generate also encodes a sidecar from the cache for any cached tile without one, so an existing cache converts without touching the originals. Each store counts its writes and stamps rows with the count, paired with an id drawn at creation. Listings advertise both, and after each replication pass a replica pulls anything newer with FetchSidecars, a page at a time, into mounts-remote/<device>/<source>.sidecars.db. Remote tile requests restore from that copy before asking the owner, so they work with the owner offline. An owner answering FetchTiles sends a current sidecar's WebP as stored, and tiles fetched on demand land in the replica's copy too. Titan converted 97,728 cached tiles into 1.05 GB of sidecars, down from 21 GB of cache. The Mac copied all of them and drew titan tiles it had never fetched with titan's daemon stopped. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>