SleepyDB

SleepyDB is a serverless database engine that accepts Postgres connections but stores data on S3 using SQLite as its execution layer — built to let apps use familiar SQL tooling against cloud object storage. The proxy-owned transaction model exists because SQLite's transaction semantics don't stretch across multiple databases, each with its own transaction system, so the proxy layer has to hold that contract together. Performance wasn't a priority until it was: once real numbers came in, a 13k-line sprint with a step-plan doc driving parallel worktrees became the right tool to close the gap fast. A parallel thread ran alongside all of this — diagnosing 8-minute CI builds for a client app, where the culprit turned out to be webpack cache invalidation and ephemeral BuildKit, not the Next.js compiler itself.