Lightning fast Litestream VFS, but now with writes!

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Fly.io

Litestream VFS now supports write operations and background hydration for faster cold starts. The writable VFS mode buffers writes locally and syncs to object storage periodically, enabling single-writer scenarios with eventual durability. Background hydration pulls the full database from S3 while serving reads remotely, then switches to the local copy when ready. These features power Fly.io's Sprites storage stack, where every Sprite boots with 100GB of durable storage in under a second by using Litestream SQLite with S3-backed block maps.

Litestream Writable VFS

<p>This is clever. Getting near-instant startup with SQLite while syncing to S3 in the background solves a real pain for cold starts and edge apps without adding heavy infra.</p>
