Architecture

• Overview - how the layers fit together.
• Canonical service structure - the app/ skeleton.
• HTTP adapters - FastAPI, Litestar, and the five Node.js integrations.
• Architecture by scale - what changes from less than 1K to more than 1M users: RPS, cache, CQRS and sharding.
• Governed contracts - runtime-defined schemas without giving up strict validation.
• Organization isolation - a relational view that rejects operations without scope.
• Observable periodic work - locking, checkpoints, execution tracking, and silence detection.
• Explicit SQL escape hatch - native SQL in the same session and transaction.
• Outbox delivery and replay - actual ordering, recovery, and replay guarantees.