julian
bfe64032d8
Turborepo (pnpm workspaces) with all dependencies pinned to latest mutually-compatible versions: turbo 2.9, TypeScript 6, Fastify 5, React 19, Vite 8, better-sqlite3 12 + Drizzle ORM 0.45. Layout: - apps/server Fastify backend (local JWT auth + role guard, /health) - apps/web React 19 + Vite 8 operator SPA - packages/db Drizzle schema on SQLite/WAL; append-only events + users - packages/devices reader/printer/relay adapter interfaces (intent-only relay) - packages/shared shared domain types Architecture constraints from the design wiki are encoded in the scaffold: append-only hash-chained + signed event log, device-agnostic adapters, "a barrier is not a door" (relay expresses intent only), fully-local offline-first auth. wiki/ is an LLM-maintained Obsidian knowledge base (28 pages) ingested from the architecture & design notes, with its own maintenance schema. Verified: pnpm install, full turbo build (5/5), server boots and serves /health, drizzle-kit generates the initial migration.
21 lines
959 B
Markdown
21 lines
959 B
Markdown
---
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type: concept
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tags: [parking, safety, devices]
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sources: [parking-system-architecture]
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updated: 2026-06-14
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---
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# Safety Principle: A Barrier Is Not a Door
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A vehicle barrier must **not** be driven as a timed "door open for N ms" by the application — a
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timed auto-close can **drop a boom on a vehicle or person**. (See [[parking-system-architecture]]
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§5.)
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- **Physical safety lives in the barrier operator's own firmware** — induction loops, anti-crush,
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auto-reverse. (Recommended barrier operators in the [[bom]] are chosen because they own this.)
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- The application and any relay board **only ever express *intent* ("open")**; they never time or
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force a close against a vehicle. Reflected in the [[device-adapter-pattern]]'s `pulseOpen`.
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- Holds **regardless of which relay device** is used — [[uhppote-controller]] or
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[[esp32-custom-controller]]. The ESP32 design restates it: "the ESP32 only signals intent"
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(see [[fail-state-safety]]).
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