Effect Fair Connection Pool
A bounded pool with FIFO waiting and a fast-fail timeout instead of a hang. Opening a connection per request lets a spike exhaust the database's connection limit so even cheap queries fail; a bounded pool caps concurrency at what the database can serve and makes surplus demand wait. An unbounded wait turns backpressure into a hang, so waiting is FIFO (no waiter starves) and bounded by an acquire timeout that fails with a typed AcquireTimeout under saturation. Acquire and release are single Ref.modify hand-offs, so a connection is issued to exactly one waiter and never double-issued. The demo caps 12 concurrent requests at 3 and fails fast when saturated. Pinned to effect 4.0.0-beta.98.
npx shadcn@latest add @compronents/effect-connection-pool-fairInstalls from ui.aryank.space. Needs a registry token and a one-time @compronents entry in components.json. The docs walk through both.
The pool caps concurrency at what the database can serve: 12 concurrent requests against 3 connections never run more than 3 at once. Surplus waits FIFO, and a saturated wait fails fast with AcquireTimeout instead of hanging.