# Wiki Log

Append-only chronological record. Each entry: `## [YYYY-MM-DD] <op> | <subject>`.
Query with `grep "^## \[" log.md | tail -5`.

## [2026-06-14] ingest | Parking System — Architecture & Design Notes
First source ingested. Bootstrapped wiki scaffolding (CLAUDE.md schema, index.md,
overview.md, log.md). Created source summary, 14 entity pages, 9 concept pages, and
decision records (settled decisions + 6 open questions). Source is a dense design
doc covering stack, threat model, device architecture, UHPPOTE access control, the
custom ESP32 controller alternative, readers, and a reference BOM.

## [2026-06-15] decision | JWT key choice + ESP32 deferred
From app work, not a new source. Added [[open-questions]] #7 (symmetric vs.
asymmetric JWT signing key — raised by the commit security review; prefer RS256/EdDSA
so verifying hosts hold only a public key, mirroring the ATECC608 / challenge-response
property). Marked [[esp32-custom-controller]] `status: deferred` per decision not to
implement device-level auth for now (access control stays on UHPPOTE + network
isolation); noted in [[open-questions]] #6. Updated [[local-jwt-auth]] (hardened secret
handling + 8h expiry, asymmetric-key pointer) and the index.

## [2026-06-15] decision | Device-agnostic registry + first-run setup
From app work. Made the [[device-adapter-pattern]] selectable: added a
[[device-registry]] (catalog of drivers per category) and a [[first-run-setup]]
flow so the admin picks a device per lane at install. Categories: access
(ZKTeco / ESP32 relay), reader (Wiegand / TCP-IP), camera (Hikvision / Dahua,
snapshot-on-event), printer. Added a `CameraDevice` interface; new `lane_devices`
+ `setup_state` tables (migration 0001); admin-only setup endpoints. Stub drivers
for now (no real vendor protocols yet). Verified catalog + assign + validation +
auth end to end.

## [2026-06-15] decision | UHPPOTE library chosen + real driver
Researched Node options for the UHPPOTE controller. Chose the official
**`uhppoted`** npm package (MIT, actively maintained, full API incl. openDoor,
get-event(s)/event-index, set-listener, restore-default — covers the whole
[[event-log-ingestion]] design). Rejected: raw-dgram DIY (reinvents the lib),
node-red-contrib-uhppoted (wrong model), Go REST sidecar (extra runtime). Added
it to @parking/devices and implemented a real `uhppote` [[uhppote-controller]]
access driver (pulseOpen→openDoor, healthCheck→getStatus), registered in the
catalog. CJS interop: default-import + destructure. Verified it builds, appears
in the catalog, and degrades to "offline" gracefully without hardware. Real
on-VLAN test still pending.

## [2026-06-15] feature | Device discovery (UHPPOTE scan in setup)
The frontend had no way to find a UHPPOTE — but the controllers self-announce via
UDP broadcast. Added a generic [[device-discovery]] capability: optional
`DiscoverableDriver.discover()` on the registry, implemented by the `uhppote`
driver via `getDevices`. New admin-only `GET /api/setup/discover/:driverId`
(health-checks each found device); catalog now returns a `discoverable` list.
SetupWizard gains a "Scan for controllers" button that lists found devices with
health badges and auto-fills serial + host on selection. Verified: catalog flags
uhppote; discover runs and fails gracefully without hardware (broadcast EACCES);
non-discoverable driver → 400; no token → 401. Modeled generically so cameras
(ONVIF) can add discovery later.

## [2026-06-15] test+blocker | UHPPOTE hardware bring-up + entry-flow blocker
Brought up the real UHPPOTE (serial 225088491, fw 09120) end to end. Fixed the
networking path: WSL2 mirrored mode, then driver bugs — subnet-directed broadcast
(the lib doesn't enable SO_BROADCAST for global 255.255.255.255), broadcast must
match the target's subnet for unicast reply routing (health-check timeout fix),
multi-subnet discovery, and serialized I/O (concurrent calls collided on :60001).
Added .env loading (Node --env-file), env-gated+fail-closed SETUP_AUTH_BYPASS, and
an authBypass flag so the wizard drops the token field. Test scripts in
apps/server/scripts/ (uhppote-listen, uhppote-relay).

VERIFIED on hardware: discovery; host-commanded openDoor doors 1&2 (physical +
reason="remote open door"); button presses live (reason="push button ok").

BLOCKER FOUND: the controller push-button input auto-opens the relay in firmware —
no command to report-without-opening — so ticket-first entry (button→print→open)
is impossible as wired. UHPPOTE can't do it on that input; ZKTeco *might* via a
programmable aux input + PULL SDK but that's unverified and needs a new driver.
Recorded in [[access-controller-button-flow]] + [[zkteco-controller]]. Entry-lane
hardware decision paused to focus on the business side.

## [2026-06-15] feature | Cookie-based auth/authz (login, CSRF)
Built real authentication: bcrypt login → JWT in an HttpOnly+SameSite=Strict
cookie, readable CSRF cookie + X-CSRF-Token header (double-submit) on mutations,
role-guarded routes. Routes: /api/auth/{login,logout,me}. First admin seeded via
`pnpm --filter @parking/server seed-admin`. Removed the SETUP_AUTH_BYPASS shim
and the wizard token field; the SPA gates on /api/auth/me and only shows setup to
admins. Same-origin via the Vite dev proxy and a new prod nginx config
(deploy/nginx.conf). Verified end to end (curl + browser): wrong pass→401,
login→cookies set, me→admin, assign without CSRF→403 / with→201, no cookie→401,
session persists across reload. Updated [[local-jwt-auth]].

## [2026-06-15] lint+docs | Dev-environment pages (WSL networking, workflow)
Captured hard-won dev knowledge that was only in commit messages: new
[[wsl-dev-networking]] (WSL2 NAT blocks UDP broadcast → mirrored mode + the
multi-interface / subnet-broadcast / IPv6-localhost gotchas that remained) and
[[local-dev-workflow]] (setup, seed:admin, the dev-server-hang from the broken
strip-types script → tsx, the 127.0.0.1 proxy fix, .env loading). Corrected the
earlier "broadcast permission (EACCES)" note in [[device-discovery]] — the real
cause was the lib not enabling SO_BROADCAST for the global 255.255.255.255;
documented the three verified broadcast gotchas + serialization. Added a `reference`
page type to the schema; new "Dev environment" index section.

## [2026-06-15] decision | Dingtian relay chosen; HTTP over MQTT; unmanned direction
New relay+input controller on hand (Dingtian 4ch). Its inputs are decoupled from
relays (configurable via input_link_relay) — solves the [[access-controller-button-flow]]
blocker the UHPPOTE couldn't. Transport decision [[dingtian-vs-mqtt]]: direct
HTTP/UDP now (UDP string for relay control on :60001; device input_link_url HTTP
push for button events), MQTT skipped (broker = infra + failure mode + overkill at
this scale) but kept for later multi-lane scale. Recorded the stated roadmap to
**fully unmanned, no-booth** operation in [[autonomous-direction]] and its threat-model
shift (operator-fraud → unattended-machine threats). New stub [[dingtian-relay]]
with the full protocol from the SDK. Driver + on-hardware test still to build.

## [2026-06-15] driver+test | Dingtian driver built; button blocker RESOLVED
Built the `dingtian` access driver (AccessControlDevice relay control + InputDevice
poll-based button events + new PreconditionDevice capability). Verified end to end on
real hardware (DT-R004 @ 10.0.10.172, HTTP config on :8080, UDP control :60001):
status read, relay pulse, input press/release. Disabled `input_link_relay` via the
driver's fixPreconditions (GET config → flag 0 + clear maps → POST config_set), then
confirmed: pressing inputs now fires NO relay (0000 status) — host-in-the-loop entry
works. The [[access-controller-button-flow]] blocker is RESOLVED. Gotcha recorded in
[[dingtian-relay]]: config_set requires injecting "command":"setconfig" after "status"
(GET omits it) or the write silently no-ops. Added httpPort config field (port 8080 ≠
default 80). Test script apps/server/scripts/dingtian-test.mjs. Next: input HTTP-push
endpoint + wiring input→ticket→pulseOpen.

## [2026-06-15] cleanup | Remove UHPPOTE/ZKTeco code; wiki → rejected/historical
Neither UHPPOTE nor ZKTeco is used (Dingtian chosen). Removed their code:
deleted access-uhppote.ts, uhppoted.d.ts, access.ts (zkteco/esp32 stubs), the
three uhppote-*.mjs scripts; dropped the `uhppoted` npm dep from both packages;
unregistered uhppote/zkteco/esp32-relay from the driver registry; updated example
comments. Catalog access drivers now = dingtian only. Build green.
Wiki: kept the pages but marked [[uhppote-controller]] + [[zkteco-controller]]
rejected/historical, [[uhppote-vs-esp32]] historical; re-pointed all "current
device" framing (standing-decisions, bom, overview, open-questions) to
[[dingtian-relay]]; noted no current driver uses [[device-discovery]]. Transferable
concepts (network-isolation, event-log-ingestion, barrier-not-a-door, threat-model)
kept as-is. Links lint clean; raw source untouched (immutable).

## [2026-06-15] feature | Dingtian input HTTP-push → backend (no polling)
Wired the device's "Input Link URL" feature so it HTTP-pushes button events to
our backend — no polling. Driver `configureInputPush()` writes input_link_url
(per-input server/port/path, en=1, active-LOW, plain HTTP) via the config API
(reusing the #writeConfig + command:setconfig helper). New backend route
`routes/devices.ts`: public `GET/POST /api/devices/dingtian/:deviceId/input/:n/{on,off}`
→ emits onto an internal device-events bus (device-events.ts, EventEmitter) for
the entry flow to consume. VERIFIED on hardware: configured device, real presses
on all 4 inputs pushed to the backend (input N on+off, source = device IP). Trust
model recorded in [[device-input-flow]]: flat network / no VLAN → backend is source
of truth, every open is a signed event (out-of-band open = anomaly); push endpoint
not behind cookie auth (machine call), shared-secret available as defence-in-depth.
Next: wire signed event + ticket print + pulseOpen.

## [2026-06-15] feature | Dingtian push auth via HTTP Digest (hardware-tested)
Secured the device→backend input push. Empirically tested auth options on the
device: HTTPS-to-self-signed FAILS, Basic works, **Digest works** → chose Digest
(MD5, qop=auth): password never on the wire, single-use nonces. Backend
digest-auth.ts (challenge/verify) + source-IP allowlist on the push route;
per-device pushUser/pushPassword generated on assign, written to the device and
stored in lane_devices (admin never types a URL/secret). Driver
configureInputPush now sets auth=2 + creds; the assign flow auto-configures the
device and persists the creds (net.ts derives the backend IP on the device's
subnet). Removed the earlier URL-token approach (token in URL is sniffable/logged).
TWO HARD-WON DEVICE BUGS fixed: (1) config_set requires an explicit Content-Length
— the device silently ignores chunked bodies (Node's default), which masqueraded
as "writes don't apply" all session; (2) the `pass` field caps at 31 chars →
use a 24-char password. Driver #writeConfig now polls-until-verified (device
reboots on apply). VERIFIED on hardware: assign auto-configures the device, then
all 4 inputs push with Digest auth, zero failures. Recorded in [[device-input-flow]].

## [2026-06-15] feature | Setup wizard: Test connection + Save & configure
Two-step device setup UX. New admin-only POST /api/setup/test (healthCheck +
checkPreconditions, no save / no device change). The assign (Save) step now also
fixes preconditions (disables input_link_relay) before configuring push — closing
a gap where assigned devices could still auto-fire relays; fails the save with no
DB row if device config fails (no orphan rows). SetupWizard wires the config
fields → Test button (health badge + precondition warnings) → Save & configure
button. Verified in-browser against the real device: Test shows ● ready +
preconditions OK; Save persists the row AND writes the device's Input Link URL
(push path matches the saved device id). Admin never logs into the device web UI.
Updated [[first-run-setup]].

## [2026-06-15] feature | Device hardening: binary relay + relay_pw + disable channels
Hardened the Dingtian relay control for the flat (no-VLAN) network. Switched
pulseOpen from the unauthenticated string protocol (:60001) to the **binary
protocol (:60000) with a relay password** — the only authenticated relay option
(frame verified on hardware: FF AA <sess> 03 <pwLE> <relayByte> <jogLE>). New
HardenableDevice capability: harden() sets a random relay_pw + disables unused
channels (rs485/can/tcp×2/mqtt → p:255, keep UDP binary+string). Folded into the
assign/Save flow (preconditions → harden → push); relayPassword stored in
lane_devices. Verified end to end: assign configures + hardens the device, config
API stays reachable, pulseOpen with the stored password fires the relay, without
it is rejected.

⚠️ LESSON: enabling the device's HTTP CGI session check (session_en) on this
firmware breaks the config-READ API (ECONNRESET) — locked us out, needed a FACTORY
RESET to recover. harden() deliberately does NOT touch session_en. The open CGI
API is accepted as flat-network reality; the signed log is the real guarantee.
Recorded in [[device-input-flow]] + [[dingtian-relay]].

## [2026-06-14] query | Dingtian web-login rotation + CGI API is unauthenticated
While addressing "change the device's default admin/admin", traced the device web
UI JS (system.js) → the change-login endpoint is
`GET /userset.cgi?<old_u>&<old_p>&<new_u>&<new_p>&` (response `&0&/&` = success,
`&2&/&` = wrong old pw). Added a best-effort `setWebLogin`/`#rotateWebLogin` step
to `harden()` (new pw stored back as config `webPassword`, stripped from API
responses). KEY FINDING: the device CGI API needs NO authentication — config dump,
config write, relay fire, and userset.cgi itself all return 200 unauthenticated
(verified on 10.0.10.5). admin/admin gates only the browser UI; there is no
inbound-auth setting (only session_en, which bricks the read API). So rotating the
login is COSMETIC, not a boundary — the signed event log remains the real
guarantee. Recorded in [[dingtian-relay]] (new Hardening section).

## [2026-06-14] ingest | Rongta 80mm printer driver + printer roles/failover
- Added `rongta` PrinterDevice driver (ESC/POS over raw TCP 9100); registered in registry.
- Decision: ≥2 printers per lane by role (entry-dispenser outside, booth-receipt inside);
  entry ticket fails over outside→booth (asymmetric — receipts never print outside).
- Selection logic lives in packages/devices/printer-routing.ts (orderForRole, printWithFailover).
- One unit verified reachable at 10.0.10.6:9100 from host (TCP connect OK).
- New pages: [[rongta-printer]], [[printer-roles-failover]]. Updated [[bom]], [[index]].
- Open: all-printers-down policy belongs to the (not-yet-built) entry flow, not the printer layer.

## [2026-06-14] ingest | Live printer status monitoring
- Added MonitorableDevice.readStatus()/PrinterStatus capability in packages/devices.
- Rongta readStatus() scrapes the device's own /prn_stat.htm (Cover/Cutter/Paper End/Near End/
  Off-Line) — chosen over hand-decoding DLE EOT because this clone's DLE EOT bytes don't match
  the canonical ESC/POS bit layout (verified on hardware; risk of false-healthy).
- Server PrinterMonitor: polls enabled monitorable printers (PRINTER_POLL_MS, default 5s),
  caches latest, emits "printer-status" on change. API: GET /api/printers/status + SSE stream.
- Verified live: 10.0.10.6 -> ready (all flags clear); unreachable host -> offline (no throw);
  bus emits on change, suppresses unchanged. Full repo typechecks (8/8).
- New page: [[printer-status-monitoring]]. Updated [[rongta-printer]], [[index]].
- Open: capture the page's actual text for an ACTIVE fault (pull paper / open cover) to confirm
  the Yes flip; wire degraded/offline into failover + entry-flow all-down policy.

## [2026-06-15] ingest | Multi-instance device setup (add/remove per category)
- Confirmed the data model was already multi-instance (lane_devices = one row per instance,
  assign always inserts); the limitation was UI-only (one slot per category).
- Backend: added DELETE /api/setup/assign/:id (unassign); /state now redacts secrets
  (pushPassword/webPassword/relayPassword) via a shared redactSecrets() also used by /assign.
- Web: SetupWizard reworked — each category lists assigned instances (with Remove) + "Add
  another" form; select-type config fields now render as dropdowns (fixes printer role input).
- Verified via Fastify inject: 2 printers assigned to one lane -> both listed, no secret leak,
  delete -> 204, delete unknown -> 404, count drops to 1. Full repo typechecks (8/8).
- Updated [[first-run-setup]].

## [2026-06-15] ingest | Append-only signed event log (Dingtian input pushes persist)
- Q: does the Dingtian push events? -> inputs YES (input_link_url), relay opens NO (device keeps
  no log). Host is the source of truth; a relay open w/o matching signed event is the anomaly.
- Implemented EventLog (apps/server/event-log.ts): serialized append, monotonic index, prevHash
  chain, signature; verifyChain() detects tamper/reorder/delete. Read: GET /api/events;
  integrity: GET /api/events/verify (admin).
- Signer abstraction (packages/shared) over the ATECC608; SoftwareSigner (HMAC, EVENT_SIGNING_KEY)
  shipped now since chip wiring is open-question #6. Caveat documented: software signer is
  tamper-evident but NOT unforgeable-by-owner.
- Wired bus -> log: Dingtian input pushes become input_received events (lane mapping TODO).
- Added ParkingEventType 'input_received'.
- Verified via inject: push w/o digest -> 401; pushes -> 2 signed+chained events; verify -> ok;
  direct DB tamper -> verifyChain catches at the right index; deleted row -> index gap. 5 concurrent
  appends -> indices 1..5 intact. Full repo typechecks.
- Updated [[append-only-event-chain]], [[dingtian-relay]].

## [2026-06-15] ingest | Event log + Dingtian string-protocol security fix
- Append-only signed event log shipped (EventLog, Signer abstraction over ATECC608 w/ SoftwareSigner
  HMAC; GET /api/events + /api/events/verify). Dingtian input pushes persist as input_received.
  Verified on hardware: shorting I1-I4 -> 8 signed+chained events, verifyChain ok.
- SECURITY (verified on hardware): the password-less string protocol (udp2) can fire relays
  ("11" -> relay1 on) with NO auth, bypassing relay_pw. Fixes: status reads moved to authenticated
  binary read (cmd 0x00); harden() disables udp2 BEST-EFFORT (firmware V3.6J config API refuses,
  but web UI works) and returns a warning instead of throwing. After web-UI disable, the "11" attack
  is dead and binary control/status still work.
- GAP (user-identified): event log captures host-originated actions only; out-of-band relay
  actuation (sniffed relay_pw, string protocol, ip_watchdog) produces NO event — proven on hardware.
  Real control is reconciliation vs. an independent witness; witness+reconciliation NOT yet built.
- Device web login (webUser/webPassword) now un-redacted in setup state (admin-only device area);
  pushPassword/relayPassword stay machine-only.
- harden() warnings surfaced via the assign response.
- localAddress threaded through the Dingtian driver (device-facing-IP foundation; multi-homed hosts).
- INCIDENT: probing default.cgi factory-reset the bench device (now at 192.168.1.100, defaults).
  Re-provisioning is the ADMIN's job via First-run setup (app must not hardcode site IPs).
- Updated [[append-only-event-chain]], [[dingtian-relay]].

## [2026-06-15] fix | Dingtian web-password: desired-vs-current split + verify + UI warnings
- BUG (found in real assign): admin typed a web password; harden used it as the OLD cred, rotation
  failed silently, DB saved the typed value but device login stayed admin/admin. Also UDP2 warning
  never reached the admin (frontend discarded the assign response).
- FIX: split config into webPassword (desired; blank→random) and webPasswordCurrent (existing old
  cred, default admin). harden() rotates current→desired, VERIFIES by re-auth with the new pw, and
  only returns secrets.webPassword on success (else warning, no save). assign strips typed
  webPassword/webPasswordCurrent and persists only verified secrets.
- SetupWizard now shows assign-response warnings (amber banner, per category) — closes the
  feedback loop for the UDP2-can't-disable case.
- Verified on hardware (192.168.1.100): harden set login to a chosen pw; device then rejects
  admin/admin (&2&) and accepts the chosen pw (&0&). UDP2 warning surfaced as designed.
- Updated [[dingtian-relay]].

## [2026-06-15] update | input_received lane resolution + source semantics
- Wired device→lane resolution: `LaneMap` (`apps/server/src/lane-map.ts`) caches
  `lane_devices.id → lane`, refreshed by setup routes on assign/unassign. `input_received`
  events now carry the firing device's lane instead of a hardcoded `lane: 0`. Unmapped device →
  `lane: -1` + warn (0 is a real lane; never mis-stamp).
- Documented that `source` stays null for raw inputs by design (it's an IdentitySource, not a
  device field); device provenance is in `identity`.
- Updated [[append-only-event-chain]].

## [2026-06-15] test+lesson | Hikvision camera verified; multi-subnet source-address trap
- Pulled a real snapshot from a Hikvision camera on the bench: `GET
  http://10.0.10.121/ISAPI/Streaming/channels/101/picture`, Digest auth, admin/admin123 → HTTP 200,
  2688×1520 JPEG. Path + auth + creds confirmed. ISAPI is the right surface; the device's
  "Enable Hikvision-CGI" toggle is a *different* legacy CGI API and is NOT needed.
- Caveat recorded: the camera driver is still a STUB — the wizard's "● ready — stub / ●
  preconditions OK" contacts nothing; cameras have no preconditions (only [[dingtian-relay]]
  implements checkPreconditions). Noted the cosmetic "Backend push IP" bug (camera pulls, doesn't
  push; field should gate on a `pushesToBackend` capability).
- LESSON (cost an hour of "why can't we ping the subnet"): with two device subnets stacked on one
  NIC (`192.168.1.123` + `10.0.10.203` on eth1), Linux picked the WRONG source address for
  `10.0.10.x` → ARP shows REACHABLE but all ping/TCP times out. Fix: pin `src` on the connected
  route (`ip route change <subnet>/24 dev <nic> proto kernel scope link src <host-ip>`), or force
  source per-call (`ping -I` / `curl --interface`). Devices arrive on assorted static `/24`s; the
  host carries one IP per subnet — this trap is the recurring cost of that.
- Decision context: production is a dedicated hardened **Linux appliance** (this WSL2 box is a dev
  stand-in). Multi-subnet config + `src` pinning is an appliance deployment concern (made
  persistent via networkd/netplan), riding on [[network-isolation]]; long-term answer is to re-IP
  devices onto one planned parking subnet at install.
- Updated [[lpr-camera]] (snapshot driver + verified-on-hardware section), [[wsl-dev-networking]]
  (multi-subnet source-address trap + appliance pattern).

## [2026-06-15] driver+fix | Real Hikvision/Dahua camera driver; push-IP field gated
- Replaced the camera STUB with a real `HttpCamera` (`packages/devices/src/drivers/camera.ts`):
  Hikvision ISAPI (`/ISAPI/Streaming/channels/<ch>01/picture`) + Dahua CGI (0-based channel), both
  over client-side HTTP Digest (new `drivers/http-digest.ts`, two-shot 401→challenge→response,
  qop=auth MD5 — the client counterpart to the server's digest-auth.ts). `healthCheck()` now
  actually pulls a frame instead of returning `ready/stub`. Added `localAddress` + `timeoutMs` +
  `channel` config; threads the device-facing NIC for the multi-subnet trap.
- Snapshot interface: `Snapshot` now carries `bytes: Buffer` (driver fetches); `imageRef` is
  optional and set by the CALLER once stored — keeps the adapter free of storage deps. Nothing
  consumed captureSnapshot yet, so no migration needed.
- Cosmetic bug fixed: "Backend push IP" showed for any reachable host. Added a `pushesToBackend`
  flag to `DeviceDriver` (only [[dingtian-relay]] sets it), exposed as `pushCapable` in the catalog
  (mirrors `discoverable`), and gated both the wizard's backend-IP fetch and the field on it.
  Cameras/printers/readers no longer show it.
- VERIFIED on hardware: built clean (5/5 packages); ran the real driver against the Hikvision at
  10.0.10.121 → healthCheck ready, captureSnapshot returned a valid 322 KB JPEG (correct magic).
- Updated [[lpr-camera]].

## [2026-06-15] fix | Permanent WSL2 source-address fix (systemd hook)
- The multi-subnet source-address trap kept recurring (every `wsl --shutdown` wipes the runtime
  `ip route` pin — mirrored mode re-clones the Windows NIC's addresses fresh each boot, and NOTHING
  inside Linux owns them: networkd/NM/netplan all inactive). Made it permanent on the dev box.
- `deploy/wsl-fix-route-source.sh`: walks each `proto kernel scope link` route on the NIC and pins
  `src` to the host's own address in that same subnet — no hardcoded IPs (covers future device
  subnets), idempotent, preserves route metric, non-fatal per route. `deploy/parking-net.service`:
  oneshot, enabled, reapplies on every boot.
- BUGS hit + fixed while building it: (1) `ip route change` errors `RTNETLINK: No such file` when
  the route isn't up yet at boot → use `replace`; (2) `set -e` made one failed `ip` abort the whole
  unit → dropped it, per-route warnings instead; (3) `network.target` fires before mirrored-mode
  addresses land → script waits up to 15s for a route.
- VERIFIED: service enabled+active, journal shows `pinned 10.0.10.0/24 -> src 10.0.10.203`, camera
  pings with NO -I flag (0% loss), and the real Hikvision driver pulls a snapshot with NO
  `localAddress` set. Root cause noted as Windows-side (stray 192.168.1.x); this is the
  self-contained Linux answer.
- Updated [[wsl-dev-networking]].

## [2026-06-15] design | Business layer kickoff — parking session model
- Pivoted from the (hardware-verified) device/integrity layer to the business domain. Wiki-first.
- KEY DECISION: a [[parking-session]] is a PROJECTION over the signed [[append-only-event-chain]],
  never a mutable table — a mutable sessions row with paid/owed would reopen the operator-fraud
  hole the whole system closes. "Paid" = a signed `payment` event (unforgeable, undeletable).
- Scope (user): mixed site, TRANSIENT-FIRST; [[permit]] holders layered as a 2nd identity source
  that short-circuits payment. Payment = PAY-ON-FOOT / pay station (decoupled from exit; exit lane
  only validates paid + within walk-back grace). Matches [[autonomous-direction]].
- New signed event types designed (not yet built): `vehicle_entry`, `vehicle_exit`, `payment`,
  `void` — extend `input_received`. Lifecycle OPEN→PAID→CLOSED (+VOIDED); overstay top-up is the
  one genuinely stateful edge case.
- New pages: [[parking-session]], [[tariff]] (pure/data-driven fee fn; gracePeriodExit is a real
  pay-on-foot revenue param), decision [[session-model]]. Updated [[append-only-event-chain]],
  [[index]]. Closes the dangling entry-flow thread from [[device-input-flow]].
- [[permit]] drafted + RESOLVED from user input: credentials = RF tag/chip/card + QR (optical
  reader). Car limits = two numbers: `registeredCars[]` whitelist + admin-set `maxConcurrent` (in
  at once) — enforced as a fold over the permit's open sessions. Identity = card/QR OR matching
  plate (either opens; card-sharing not prevented by design, caught by reconciliation). Autonomy =
  host-in-the-loop for everything → Dingtian stays sufficient, no new controller; permit entry
  fails closed if host down. Remaining open: reader hardware models; lapsed/revoked policy.
- NEXT: schema (`packages/db`: permits/tariffs + session projection) + the
  input_received→vehicle_entry flow (closes the [[device-input-flow]] thread).

## [2026-06-15] design | Host-side vision service (ANPR + vehicle verification)
- User: optionally bind camera images to an OpenCV service we build. Resolved scope: ANPR (plate →
  `IdentitySource='lpr'`); a **separate local Python/OpenCV microservice** on the appliance (Node →
  localhost HTTP), offline; it **replaces the dedicated edge-AI [[lpr-camera]]** (recognition on
  ordinary Hikvision/Dahua snapshots — reuses `Snapshot.bytes`).
- LICENSING: best ANPR/vehicle models are AGPL/commercial vs. the MIT/Apache/BSD standing rule.
  Decision: **scoped AGPL exception** — allowed INSIDE the vision service only (separate process,
  not linked); app stays permissive. Amended [[standing-decisions]].
- USER ANTI-FRAUD INSIGHT: a fraudster can print a registered plate and enter with a different car.
  → service also does **vehicle-attribute / fingerprint verification**, so the *car* reconciles, not
  just the plate. This fills the independent-witness gap [[append-only-event-chain]] calls out:
  plate-on-different-car = anomaly. Recognition is advisory (confidence + ticket fallback), evidence
  (read + image) attaches to the signed event.
- New pages: [[opencv-anpr-service]], decision [[vision-service]]. Updated [[standing-decisions]],
  [[lpr-camera]] (host-side supersedes edge-AI), [[permit]] (plate-spoof defence),
  [[append-only-event-chain]] (vision as witness), [[index]].
- Open: recognizer/vehicle-model choice + accuracy; fingerprint method + anomaly threshold; appliance
  compute (CPU vs GPU/NPU); per-camera opt-in; the still-unbuilt reconciliation logic.

## [2026-06-15] design | Transient pricing — composable, versioned tariff
- User: pricing is unknown + constantly changing → must be **admin-composable at runtime**, currency
  selectable, FX later. Reframed [[tariff]] from "config we ship with numbers" to a first-class
  editable entity.
- DECISIONS: (1) rate structure = **stepped duration blocks + rolling-24h daily cap** (flat rate is
  one block; expresses first-hour/taper/cap with no special cases); (2) overstay top-up =
  **reprice the difference** (recompute entry→now − alreadyPaid); (3) tariffs are **effective-dated
  immutable versions** — edits publish a new version, sessions reprice against the version in force,
  the `payment` event records `tariffVersionId` (reproducible + fixed in the signed chain); (4)
  **one active tariff per site**, but modelled with id/scope so multi-tariff needs no migration;
  (5) **currency selectable (ISO 4217)**, money = `{minorUnits, currency}`, payment reserves a null
  `fxRate` → FX-ready, **FX engine deferred** (needs offline rate source — new [[open-questions]] #8).
- Ships with **no rate card**; owner must compose+publish one (blank = free or gated, operator
  policy — open). Numbers in the page are illustrative, not defaults.
- Wrote the pure integer fee algorithm into [[tariff]] (data model: `tariffs` + immutable
  `tariff_versions`). Updated [[open-questions]] (#8 FX), [[index]].
- NEXT: schema (`packages/db`) for tariffs/versions + permits + session projection, then the
  composer UI + the input_received→vehicle_entry flow.

## [2026-06-15] design | Shifts (manned-only) + Z-report; drop time-based token
- Q: what happens at operator shift end? Resolved scope, deliberately small.
- Shifts exist ONLY in manned mode — a human accountability boundary. The fully-automated/unmanned
  system has NO shifts; the pay-station cash-collection cycle + [[reconciliation]] replace it.
- Shift is NOT time-based: relief arrives late / no-shows / one operator forced into a double.
  → **drop the 8h token expiry**; login valid **until explicit logout** (updated [[local-jwt-auth]];
  code change pending). Start/End Shift are **explicit, independent of login** — one login spans many
  shifts; a double = End then Start again, no re-login.
- End Shift = sum signed `payment` events in the shift by tender → append a signed `shift_z_report`
  (type already in packages/shared, chained to prior Z) → **PRINT cash total + POS total (if a POS
  is configured)**. That's the whole human-side ask. No blind count / variance gate / manager
  override. Fraud control stays in the signed chain + later [[reconciliation]] (catch a skim after
  the fact, not at close). Blind-count documented as an explicit optional add-on, not built.
- New page [[shift]]; updated [[local-jwt-auth]], [[index]].
- Open: Z sums by payment-time (the operator who took the money) — confirm; X-report (read-only
  mid-shift); per-operator vs per-booth vs per-site (ties to [[open-questions]] #1). `payment` event
  needs a `tender` field (cash/card) — fold into the schema step.

## [2026-06-15] design | Scope sweep — capacity, validation, reporting, integrity gaps
- "What else can a PMS do?" — swept the full feature surface against the design; user picked the
  in-scope gaps. New pages:
  - [[capacity-occupancy]] — occupancy = fold over open sessions; refuse entry + drive a FULL sign
    when full; **exit never blocked** ([[fail-state-safety]]); zone-ready; counting-drift = anomaly.
  - [[validation-discounts]] — merchant validates a ticket → **signed discount event** applied at
    fee time ([[tariff]]); over-validation visible to [[reconciliation]]; payment records gross/disc/net.
  - [[reporting-analytics]] — revenue/occupancy/stay/permit/anomaly reports as projections over the
    chain; **plate-search** (admin looks up a session by plate IF captured — honest "not captured").
  - [[clock-integrity]] — fees depend on the host clock; offline box → backdating attack; monotonic
    index catches reorder, clock-regression = `anomaly`, RTC + privileged-only time change.
  - [[blocklist]] — barred plates/cards refused at **entry only**; signed + attributed.
- Folded into existing pages: **manual overrides** = signed reason-coded events (legitimate
  counterpart to the out-of-band-open anomaly) + **lost-ticket admin-arbitrary amount** →
  [[parking-session]] + [[tariff]]; **backup/restore** confirmed in-scope, expanded [[open-questions]]
  #5 (restored copy must still verifyChain; doubles as the reconciliation export).
- NOT captured (flagged): **intercom/help-call** — user didn't select it, but it's the only human
  fallback for an unmanned lane; revisit. Deferred roadmap: reservations, mobile app, EV, loyalty.
- Updated [[index]].

## [2026-06-15] design | Second sweep — ticket encoding + anti-passback; money corners deferred
- More gap-hunting. New pages:
  - [[ticket-encoding]] — the transient session key: opaque/unguessable **ticket id printed as QR**
    by [[rongta-printer]], **scanned at pay station + exit** (new ReaderDevice/imager behind the
    adapter); plate-as-ticket ticketless alt coexists per lane. The physical backbone of the
    transient flow (was only implied).
  - [[anti-passback]] — one id can't enter while it already has an OPEN session (card/ticket-passing
    over the fence); a fold over the chain, *under* permit `maxConcurrent`. Soft (flag `anomaly`) by
    default vs. hard (refuse); honest dependence on reliable exit detection.
- DEFERRED (user): **receipts/VAT invoices** + **refunds/change/overpay** — depend on pay-station
  hardware + manned/unmanned payment subsystem; recorded as [[open-questions]] #9, revisit at
  procurement (may change what the `payment` event stores → flagged before schema).
- Still open & load-bearing: **lane topology** (#1) — not resolved; scopes sessions/occupancy/shifts.
- Updated [[open-questions]] (#9), [[index]].

## [2026-06-15] decision | Split signed business ledger from device telemetry
- User correction before schema: the `events` table conflated TWO things — the anti-fraud business
  ledger AND device telemetry (button pushes as `input_received`). Split them.
- `ledger_events` (rename of `events`): signed, hash-chained, ATECC608-signed business facts only
  (vehicle_entry/exit, payment, void, shift_z_report + witness barrier_open_command/observed,
  anomaly). Reconciliation + session/tariff/occupancy projections run on this.
- `device_events` (new, [[device-events]]): UNSIGNED hardware telemetry (relay fired, paper-out,
  camera offline, reader read, raw input edges); high-volume, may rotate/prune; never reconciled.
- A raw button press is telemetry → device_events; the entry flow then mints a SIGNED vehicle_entry.
  So `input_received`-as-signed-event is dropped (was transitional). No prod chain data exists, so
  the rename/restructure is safe now (no signatures to invalidate).
- New: decision [[event-streams-split]], concept [[device-events]]; updated [[append-only-event-chain]]
  (two streams + as-built-vs-pending), [[index]].
- NEXT (schema): rename events→ledger_events; add device_events; split ParkingEventType in shared;
  then tariffs/versions, permits, blocklist, sessions projection. EventLog/canonicalize/verifyChain
  + /api/events follow the rename (code refactor, separate from this wiki commit).

## [2026-06-15] design+build | Entry flow (start) + valet/over-capacity captured
- Building the entry flow: device input → signed `vehicle_entry` → print ticket → pulseOpen.
- DECISION (print failure): **hold** — if all printers are down, sign an `anomaly` (entry attempt,
  ticket unprinted) and do NOT open (no unticketed transient — couldn't pay on exit; operator
  handles the held car). The `vehicle_entry` is appended ONLY on the success path, right before
  pulseOpen — preserving "signed before open" and never logging an entry for a car that didn't get in.
- DECISION (capacity): wire transient entry now; the FULL gate comes later (needs capacity config +
  occupancy fold).
- VALET / OVER-CAPACITY (user): "full" is a **soft, operator-configurable** policy — operator may
  valet-accept over capacity (customer hands over keys + leaves, operator stacks the car). Manned-only,
  new custody/session shape. Captured as [[valet-overcapacity]] + made [[capacity-occupancy]] FULL a
  soft policy; NOT built into the entry flow (clean seam left). Deferred.
- New page [[valet-overcapacity]]; updated [[capacity-occupancy]], [[index]].

## [2026-06-15] build | Exit flow (pay-on-foot validation)
- Built `apps/server/src/exit-flow.ts`. Added a `read` channel to the device bus (DeviceReadEvent:
  ticket/plate/qr/card) — readers/LPR emit reads; entry stays button-driven, so reads are
  unambiguously exit/identity events for now.
- Flow: read → fold the SIGNED ledger for that identity → validate open + PAID + within
  `gracePeriodExitMin` → signed `vehicle_exit` → pulseOpen → close the session cache. Unpaid /
  grace-expired / unknown → signed `anomaly`, barrier stays closed (a deliberate business reject,
  NOT a fail-state; "exit fails open" is about host/power loss). Validation reads the ledger
  (authoritative), not the cache.
- Pay station doesn't exist yet → no `payment` events → every transient exit currently REJECTS.
  Correct end-state, not passable until pay-station lands (decided).
- VERIFIED against stubs: unpaid→anomaly+no-open; paid+grace→vehicle_exit+open+closed; grace-expired
  →anomaly; unknown ticket→anomaly; verifyChain ok across entry→pay→exit.
- GAP flagged: lane_devices has no entry/exit DIRECTION model (door mapping hardcoded to 1 for exit);
  fine while entry=button/exit=read, but multi-reader lanes need a lane-direction/role model (ties to
  [[open-questions]] #1). Updated [[parking-session]] as-built + gap, [[index]].

## [2026-06-15] build | Pay station + fee calc; JWT 8h → until-logout
- JWT: dropped the 8h `expiresIn` (server.ts global + login). Token now valid **until explicit
  logout**; cookie maxAge = 30 days so a browser restart doesn't log out an active operator
  (auth.ts `COOKIE_MAX_AGE_SECONDS`). Closes the pending change from the shift decision; updated
  [[local-jwt-auth]].
- `computeFee(enteredAt, asOf, structure)` in `packages/shared` — pure integer fee calc.
  TWO BUGS caught by tests: (1) grace must use RAW duration, not the rounded-up minutes (a 10-min
  stay was being charged a full hour); (2) the block ladder must RESET each rolling-24h day (decision:
  day 2 restarts at first-block pricing → 25h = 1200 cap + 200). Both fixed; 9 cases pass.
- Pay station (`apps/server/src/pay-station.ts` + routes `GET /api/pay/quote`, `POST /api/pay`):
  open session → active tariff version → computeFee → signed `payment` event (amount/currency/tender/
  tariffVersionId/graceExitMin); `overrideMinor` for lost-ticket/dispute. Cashier/operator/admin guard.
- VERIFIED: full loop entry→quote(300 for 90min)→pay→exit opens+closes, verifyChain ok. (A
  raw-SQL backdate in one test correctly broke the chain — the tamper-evidence working, not a flow bug.)
- Updated [[tariff]] (settled edges + as-built), [[parking-session]] (pay station as-built; full
  loop passes).

## [2026-06-15] build | Tariff composer (makes the pay station operable)
- `validateTariffStructure` in `packages/shared` — non-negative ints, ascending block bounds, only
  the last block open-ended; a malformed card can't be published.
- Routes (`apps/server/src/routes/tariffs.ts`): `GET /api/tariff` (active + history, any role) and
  `POST /api/tariff/versions` (publish immutable version, ADMIN only). Single site `tariffs` row
  created lazily. Editing = publish a new version (effective-dated, immutable).
- UI (`apps/web/src/TariffComposer.tsx`, admin shell next to SetupWizard): currency, grace windows,
  increment, daily cap, lost-ticket, add/remove rate blocks; major-unit input → minor on submit;
  shows active + history.
- VERIFIED via Fastify inject: GET empty→active null; invalid (out-of-order blocks)→400 w/ problem;
  valid→201 createdBy=admin; readonly publish→403; after publish the pay station quote returns 404
  (session) not 409 (no tariff) — i.e. it now sees the active card. Full build 5/5.
- Updated [[tariff]] (composer as-built).

## [2026-06-15] build | Permit entry/exit branch + read dispatcher
- `apps/server/src/permit-flow.ts` + `read-dispatch.ts`. A credential read now routes by WHAT the
  credential is: matches a permit (card/QR credential, or a bound plate) → permit flow; else →
  transient exit flow. Lane resolved once (`readerLaneWithAccess`, shared in lane-map.ts). Refactored
  ExitFlow.onRead → handleAt(lane,e) so the dispatcher owns lane resolution.
- Permit DIRECTION inferred from session state for that car (the read value is the per-car session
  key): no open session → ENTRY (enforce maxConcurrent, sign vehicle_entry, open); open → EXIT (sign
  vehicle_exit, open, close). Fleet permit = one session per car; anti-passback falls out.
- maxConcurrent enforced as a fold over the signed ledger (count the permit's entries whose car has
  no later exit); null = unbound. Validity window + status + plate-OR-card identity as designed.
  No ticket/fee; every use is a signed event carrying permitId. Refusals = signed anomaly, no open.
- VERIFIED against stubs: card entry → inferred exit; fleet maxConcurrent=2 (F1,F2 in, F3 rejected,
  F1 exits → F3 enters); plate-bound permit opens; revoked → reject; unknown credential falls through
  to exit-flow reject (not mis-read as permit); verifyChain ok. Full build 5/5.
- Updated [[permit]] (as-built), [[parking-session]] (read dispatch).

## [2026-06-15] build | Permit admin CRUD (route + UI)
- `apps/server/src/routes/permits.ts`: a permit is an aggregate (row + credentials + bound plates);
  create/update replace the child sets as one unit. GET (any role, for lookup), POST/PUT/DELETE +
  POST /:id/revoke (admin only). Validation: maxConcurrent positive-int-or-null; must have ≥1
  credential OR ≥1 plate. Revoke = soft (keeps history); DELETE = hard (past ledger events untouched).
- `apps/web/src/PermitManager.tsx` in the admin shell: list + add/edit (holder, car-bound toggle →
  maxConcurrent or unbound, validity window, credentials add/remove, plates as a list), revoke, delete.
- Makes permits usable without hand-seeding (companion to the tariff composer).
- VERIFIED via inject: empty + maxConcurrent=0 → 400 w/ messages; valid → 201; operator LIST 200 but
  create 403; update unbinds + REPLACES child rows (old cred gone); revoke→revoked; delete→204 then
  404, children cleaned. Full build 5/5.
- Updated [[permit]] (CRUD as-built).

## [2026-06-16] build | Shifts: open/close + signed Z-report (manned mode)
- Shift = two signed ledger events, NO mutable table: new `shift_open` event type + existing
  `shift_z_report`. Operator = logged-in user (in event `identity`); open iff their latest shift
  event is a `shift_open`. `apps/server/src/shift-service.ts`.
- Close sums `payment` events in the window by tender (cash/card, by payment time) → signed
  `shift_z_report` (totals/counts/window) → prints via the NEW generic
  `PrinterDevice.printReport(title, lines)` (Rongta ESC/POS text) to a booth-receipt printer.
  Print is best-effort — failure doesn't undo the signed close (`printed:false` returned).
- Routes (`routes/shift.ts`, cashier/operator/admin): GET /api/shift/current, POST open (409 if
  open), POST close (409 if none). UI `ShiftControl` in the shell (non-readonly): Start/End + Z totals.
- Added `printReport` to the PrinterDevice interface + Rongta driver (reusable for receipts later).
- VERIFIED: open→double-open 409→payments (cash+card; one dated outside the window excluded)→close
  totals (cash 500/card 250/3)→close-again 409→re-open ok; readonly 403; verifyChain ok. Full build 5/5.
- Updated [[shift]] (as-built).

## [2026-06-16] build | Capacity / FULL gate (occupancy fold + transient refuse)
- Occupancy = fold over the ledger (entries−exits per identity; `apps/server/src/occupancy.ts`),
  `getOccupancy` → {count, capacity, free, full}. Capacity = single-row `site_config` table (admin,
  null=uncapped); migration 0001 (additive, no prompt).
- FULL gate in the TRANSIENT entry flow: occupancy.full → refuse (no ticket/entry/open) + signed
  anomaly. Permit entry NOT gated (subscribers admitted past transient-full; their maxConcurrent
  still applies) — occupancy can read over-capacity by design.
- Routes (`routes/site.ts`): GET /api/occupancy + GET /api/site-config (any role), PUT
  /api/site-config (admin; non-neg int or null). UI `SiteSettings`: live occupancy + FULL badge
  (all), capacity editor (admin).
- VERIFIED: fill to cap=2 → 3rd transient refused (anomaly, no open); permit still admitted (occ 3/2,
  free −1); exit frees a slot; routes RBAC (op can't set, −5→400, set/clear ok); verifyChain ok.
  Full build 5/5. Physical FULL-sign relay output deferred.
- Updated [[capacity-occupancy]] (as-built).

## [2026-06-16] ingest | GEE-QR-ER80 QR access reader datasheet
- User has the reader; ingested `raw/GEE-QR-ER80 QR Code Access Control Reader.pdf`.
- CORRECTION: earlier guessed "ER80-EM" = a 125 kHz EM4100 prox-card reader. WRONG — the datasheet
  shows **GEE-QR-ER80**, a **QR / DataMatrix / 1D barcode** optical access reader (optional ID/IC
  card). It's the [[ticket-encoding|QR ticket]] scanner the design already needed, not a card reader.
- Specs: interfaces Wiegand 26/34 · RS-232 · RS-485 · USB · TCP/IP; 4–15 VDC <800 mA; 360°;
  Windows + **Linux**; wiring VCC/GND/D0/D1/TX(R+)/RX(R-)/LED/BEEP. On hand: **`-Q-W`** (QR scanner;
  Wiegand/RS-232/RS-485).
- Fit: host-side reader → a serial `ReaderDevice` adapter emitting `read` events → consumed by the
  already-built exit flow + QR-permit path. Prefer RS-232/485 (serial) over Wiegand (Wiegand can't
  carry variable-length QR; autonomy moot since [[dingtian-relay]] has no onboard ACL).
- New: source [[gee-qr-er80]] summary + entity [[gee-qr-er80]]. Updated [[ticket-encoding]],
  [[entry-exit-readers]], [[index]].
- OPEN (blocks the adapter): the RS-232/485 **frame + baud** — is a QR scan an ASCII CR/LF string
  (expected) or framed? Datasheet omits it; resolve via vendor docs or by observing the port.

## [2026-06-16] ingest+test | ER80 protocol = HTTP GET poll + JSON verdict (SDK)
- Hardware bring-up: configured the reader via the vendor Windows tool (server IP/port + "server
  language"). Moved it to 10.0.10.7. It pings (source-pin must be 10.0.10.203 — trap recurs). No
  beep on scans — initially looked like "not scanning."
- Found the QRCode SDK v1.6.5 (`QRCode_sdk - QRCode_v1_6_5/sdk/`). Protocol SETTLED, supersedes the
  serial guess in [[gee-qr-er80]]: reader does **HTTP GET** `/qa/mcardsea.php?cardid&mjihao&cjihao&
  status&time` on each scan; server replies **JSON** `{data:[{...,status,output}],code:0}`. Reply
  `status` 1=valid(beep 2×)/0=invalid(beep 1×); `output` 0=Access/1=WG26/2=WG34; `time` syncs clock.
  `status` low digit in the GET = direction (1=in/0=out).
- KEY: feedback/beep is decided by the SERVER REPLY, not locally → the "no beep" was my catch-all
  replying plain "OK" not the JSON verdict, NOT a scan failure. Host-in-the-loop + SYNCHRONOUS.
- "Server language" (JSP/PHP/C#/ASP/CGI) only selects the URL PATH; transport is plain HTTP.
- New source [[qrcode-sdk]]; updated [[gee-qr-er80]] (protocol resolved, serial open-Qs dropped),
  [[index]]. SDK kept in place (bulky+binaries), not copied to raw/.
- NEXT: backend route — parse GET, DECIDE (reuse permit/exit lookup), reply JSON verdict, emit on
  read bus. Refactor read flows to RETURN an outcome so the reply can reflect accept/reject.

## [2026-06-16] build+fix | QR reader endpoint + ReadOutcome refactor; dev-DB migrate fix
- DB FIX: dev server crashed `no such table: lane_devices`. Cause: server `.env` DATABASE_URL points
  at `apps/server/parking.sqlite` (the old dev DB I'd moved aside during the ledger split; new
  migrations added since). Applied `drizzle-kit migrate` to that path → all 14 tables present. Fresh
  DB → needs `seed-admin` + device re-assignment (empty, expected).
- REFACTOR: read flows now RETURN a `ReadOutcome {accepted,direction,reason}` (device-events.ts).
  `ReadDispatcher.dispatch`, `ExitFlow.handleAt`, `PermitFlow.run` updated. A synchronous reader can
  answer the device; fire-and-forget readers ignore it.
- ENDPOINT: `routes/qr-reader.ts` — `GET/POST /qa/mcardsea.php` (public; reader has no auth, on the
  device subnet). Parses the SDK GET, dispatches the scan, replies the SDK verdict (status 1/0 →
  beep 2×/1×, output 0, time-sync). Reader's lane keyed off device serial (cjihao) as lane_devices.id
  for now.
- VERIFIED via inject: valid permit QR→status:1+open; re-scan→permit exit; unknown→status:0; reader
  on barrier-less lane→status:0. Full build 5/5.
- Updated [[gee-qr-er80]] (endpoint as-built + hardware open items).

## [2026-06-16] test+fix | QR reader VERIFIED on hardware; path is .jsp not .php
- Ran a verbatim-vendor logger on :3000 (replies like mcardsea.php: status:0/output:2). Reader
  **beeped** → it scans, sends, and acts on the reply. Earlier "no beep" = nothing was answering :3000.
- Real GET captured: `/qa/mcardsea.jsp?cardid=52020056&mjihao=1&cjihao=H05M2AFA&status=11&time=...`
  from 10.0.10.7 (OEM = Fondvision, per referer).
- KEY FIX: the "server language" setting selects the URL EXTENSION — this unit is JSP → posts
  **`.jsp`**, but our route was `.php` only (would 404 the reader). Route now registers
  php/jsp/asp/aspx/cgi. Build green.
- Real serial **cjihao=H05M2AFA** = the lane key → assign reader as lane_devices.id="H05M2AFA".
  Reader beeped on status:0 (invalid/1-beep); a matching permit/session → status:1 (2-beep accept).
- Updated [[gee-qr-er80]] (verified-on-hardware).

## [2026-06-16] feature | gee-qr-reader driver — assign by serial, resolve lane by config
- The QR reader is a push device; setup wizard always assigns a random-UUID id, so "id = serial"
  isn't possible via the UI. Clean fix instead: new **`gee-qr-reader`** driver (reader category) with
  a single `serial` config field. Admin assigns it in the wizard (UUID id) + types the serial.
- QR endpoint now resolves the lane by **matching `lane_devices.config.serial` to the scan's
  `cjihao`** (was: row id == cjihao). `qrReaderRoutes(app, db, dispatcher)`. Unassigned serial →
  no lane → status:0 (graceful).
- `tcpip-reader` flagged as the WRONG model for this device (host-connects-out stub).
- VERIFIED via inject through the real /api/setup/assign: assign {serial:"H05M2AFA"} → .jsp scan +
  matching permit → status:1 + open; re-scan → exit; unknown card → status:0; unassigned serial →
  status:0. Full build 5/5.
- Updated [[gee-qr-er80]] (assignment as-built).

## [2026-06-16] feature | stub-access driver (bench-test the flows without a relay)
- Live QR scan reached the real app (.jsp, serial resolved) but rejected: "reader not on an
  access-equipped lane" — lane 1 had the reader but no access device. The dispatcher requires an
  access device on the same lane.
- Added a no-op **`stub-access`** driver (access category, no config): `pulseOpen` just logs, no
  device I/O — stands in on a lane to test QR→permit→accept (incl. the beep) without the
  [[dingtian-relay]] connected. NOT for production. Registered in the catalog.
- To get a live accept: assign Stub barrier to the reader's lane + a permit whose QR = the scanned
  code → status:1 (2-beep) + logged pulseOpen.

## [2026-06-16] fix | QR reader 10s beep delay — reply must Connection: close
- Live accept worked (status:1, pulseOpen, 2 beeps) but the beep came ~10 s LATE. Server responded
  in 14.7 ms; user confirmed request is fast, only the beep lags → delay is the READER, not us.
- Cause: reader sends `Connection: keep-alive` but only ACTS on the verdict once the socket CLOSES;
  Fastify kept it alive → reader waited out a ~10 s keep-alive timeout. Every vendor demo replies
  `Connection: close` + shuts the socket.
- Fix: endpoint sets `reply.header("connection","close")`. Verified the header is now sent.
- Updated [[gee-qr-er80]] (⚠️ Connection: close requirement).

## [2026-06-16] feature | lane direction (per-device entry/exit) + camera snapshots
- Direction is per **device**, not per lane: added `direction` (`entry`/`exit`/`both`, default
  `both`) to `lane_devices`. A lane's entry set = devices tagged entry|both, exit set likewise —
  no join table; tagging in the wizard IS the grouping. Rejected a lane-level `lanes` table (can't
  model one bidirectional lane). New [[lane-direction]] concept page; cross-linked [[entry-exit-readers]].
- All flows now resolve via `deviceRowsFor(lane, category, direction)` (lane-map.ts), replacing the
  ad-hoc "first access on lane" lookups. Dispatcher trusts the **reader's own direction**; a
  directional reader that contradicts the car's session state is a wrong-lane/anti-passback refusal.
  `both` keeps the old infer-from-session behavior.
- Relay open channel is now config-driven (`config.openChannel`, default 1) since a lane can hold
  an entry **and** an exit relay. LPR stays a snapshot sink — ANPR POSTs a `plate` read to the
  reader endpoint (no camera-as-input coupling).
- Camera snapshots wired into all four paths (transient/permit × entry/exit): fired AFTER
  pulseOpen, **never awaited** (evidence, not a gate — camera failure can't block an open). Stored
  as BLOB in a new `snapshots` table (not files); telemetry `kind:"snapshot"` device_event per
  capture/failure; linked to the signed event by `identity`. Served via `GET /api/snapshots/:id`.
- Migration `0002_wild_odin.sql` (additive). Snapshot **retention** left unresolved →
  [[open-questions]] #10. Whole monorepo typechecks; no test suite exists in-repo.

## [2026-06-16] redesign | SUPERSEDES the above — pool-of-spaces, per-relay direction, NO lane
- User correction: direction is NOT a property of a device row. One Dingtian board has 2+ relays;
  a single board drives both the entry barrier (relay 1) and the exit barrier (relay 2), and a
  single relay can even serve **both**. So the row-level `direction` from the entry above was wrong.
- Further: the whole **"lane" concept was dropped**. Occupancy is site-wide, device grouping is now
  the reader→relay binding, and anti-fraud never used lane. A parking lot = **one pool of spaces**
  with a flexible set of entry/exit points (1 in + 2 out, etc). New [[entry-exit-points]] page
  (replaces lane-direction); reworked [[entry-exit-readers]], [[parking-session]], [[first-run-setup]],
  [[device-registry]].
- Model now: access `config.relays = [{ relay, direction: entry|exit|both, button? }]` (`button` =
  the input terminal the entry button is wired to). Readers/cameras `config.controllerId + relay`
  bind to the barrier they sit at; direction inherited ("the relay at that reader" opens on a read).
- Schema: dropped `lane` from `ledger_events`, `device_events`, `sessions`; renamed `lane_devices`
  → `devices` (no lane/direction columns). `lane` was in the SIGNED canonical form, so canonicalize()
  dropped it and the signer keyId bumped **sw-hmac-v1 → sw-hmac-v2** (v1 events won't verify under
  v2 — intentional, gated by per-event keyId; done pre-deployment on throwaway data). Migration
  history reset to a fresh `0000_baseline` (dev DBs deleted + re-migrated).
- Resolvers in new `device-resolve.ts` (replaces lane-map.ts): `relayForButton`, `relayForDevice`,
  `firstRelayByDirection`, `devicesByDirection`. `DeviceConfig` widened to nested JSON for `relays[]`.
- Wizard rewritten: no lane selector; Controllers section (relay map + entry-button terminal per
  relay), then readers/cameras/printers bind to a controller relay. Whole monorepo typechecks +
  builds; no test suite in-repo.
- Residual: incidental `lane_devices` / "per-lane" mentions remain in some secondary wiki pages
  (device-events, device-input-flow, ticket-encoding, etc.) — flagged for a later lint pass.