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.
22 lines
881 B
Markdown
22 lines
881 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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# Fail-State & Safety (custom controller)
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For the [[esp32-custom-controller]], fail-state behaviour is to be treated **as seriously as the
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crypto**. (See [[parking-system-architecture]] §7.)
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- **Define behaviour on power/network/host loss:** **entry fails closed**, **exit fails open** —
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**never trap a vehicle** (often a legal egress requirement).
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- **Hardware manual override** (key switch/button) that opens the barrier **with the ESP32 dead**.
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- **Watchdog** with a defined safe default.
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- The **barrier operator still owns physical safety** — the ESP32 only signals intent
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([[barrier-not-a-door]]).
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The general "fail-open on exit" principle is also an [[open-questions|open question]] (#2) for
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the system as a whole, not just the custom controller.
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