Celld: Self-hosted, distributed Durable Objects

Celld is an open-source daemon that enables self-hosted deployment of Cloudflare Workers and Durable Objects on your own infrastructure, using S3-compatible storage as the coordination layer instead of a centralized control plane. Each object functions as its own SQLite database that replicates to S3, with nodes coordinating through object-storage compare-and-swap to ensure single ownership without requiring consensus protocols. The system is designed to shard applications by construction, reducing contention and failure blast radius while allowing idle cells to hibernate efficiently.