Locked decisions: pg driver behind an async Db interface with dual
engines (sqlite for fast tests, pg for prod), bigint paise, TEXT ISO
dates, jsonb payloads, numbered migrations, ?->$n in the adapter,
DATABASE_URL selects the engine. Build order: async refactor first
(zero behavior change), then schema, adapter, dual-engine suite, smoke.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Thomas Joise