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Build a saved service-map editor with React Flow, Zustand, ELK.js, Elysia on Bun, Eden Treaty and Drizzle. Users add, rename, connect, arrange and remove services; Postgres stores the graph as JSONB and commits each revision snapshot atomically. Stale tabs retain their draft and receive a visible conflict.
Includes pinned dependencies, SQL roles/schema/seed, a clickhousectl-based README, screenshot, and scoped build/unit workflow. The app is a trusted local demo with synthetic data and no accounts.
Validation ran inside an isolated OrbStack VM against local Postgres 18 and a disposable ClickHouse Managed Postgres 18 service: typecheck, build, five semantic tests, five database integration tests (concurrent revision saves, rollback, JSONB roundtrip, validation and restricted grants), and a Chromium editing/layout/save/reload/conflict workflow. Actual process restart preserved the exact saved graph. Verified managed TLS, unrelated-CA rejection, and reachable mismatched-hostname rejection through Bun SQL. The connector handles Bun 1.4.2 CA rotation bundles by retrying only supplied trust anchors while preserving hostname verification. Disposable managed service deleted and verified absent; VM stopped.
The companion article remains local and outside Git. ELK is loaded on demand; its lazy chunk still produces Vite’s large-chunk warning.