# OSM Data Model — GoodGo Platform

This document is the canonical reference for every OpenStreetMap-sourced
table in the GoodGo database, the sync pipelines that populate them, and
the query patterns that use them.

## Tables at a glance

| Table | Source | Geometry | Sync cadence | Used by |
|-------|--------|----------|--------------|---------|
| `vn_provinces` | OSM `boundary=administrative + admin_level=4` | MultiPolygon | Weekly (Mon 02:30 ICT) | `GeoLookupService`, KCN sync, address auto-fill |
| `vn_districts` | OSM `admin_level=6` | MultiPolygon | Weekly (Wed 02:30 ICT) | Same as above. **After the 2025 reform** this table effectively holds the new ward / commune layer (~3,200 units), since Vietnam dropped the district level. The schema name is kept for backwards-compat with goodgo's existing FK references. |
| `vn_wards` | OSM `admin_level=8` | MultiPolygon | Weekly (Sat 02:30 ICT) | Same as above. **Note**: after the 2025 admin reform Vietnam only uses level=4 (province) + level=6 (ward/commune). OSM doesn't currently tag any VN feature with admin_level=8, so this table will stay empty until/unless the policy changes. Kept for forward-compat. |
| `Poi` | OSM nodes/ways/relations matching 20 category selectors | Point | Daily 1 category rotation (02:00 ICT) | `/poi/nearby`, `/poi/by-bbox`, listing sidebar, search filter |
| `TransportLine` | OSM `route=subway|train|highway` relations | MultiLineString | Monthly | Distance scoring, planned for Phase 2 UX |
| `IndustrialPark` | OSM `landuse=industrial` ways/relations | Point + MultiPolygon boundary | Monthly (1st 03:00 ICT, 4 chunks) | `/industrial/parks/*`, KCN catalog |
| `OsmSyncRun` | Generated by orchestrator | — | Append-only audit | `/admin/osm` dashboard |

All sync writes are gated by `OSM_SYNC_ENABLED=true` so dev / staging
environments don't hit Overpass accidentally.

## GeoLookupService — the foundation

Every other layer depends on `vn_provinces.geometry` for PostGIS
`ST_Contains` lookups. The service exposes:

```ts
const r = await geo.lookup(lng, lat);
// → { province: { code, name }, district: { code, name }, ward: { code, name } }

const inside = await geo.isInVietnam(lng, lat);
// → boolean

const cov = await geo.coverage();
// → { provinces: { total, withGeometry, lastSyncedAt }, districts: ..., wards: ... }
```

It replaces the old `nearestProvince()` heuristic that walked a
hardcoded centroid table.

## Quality gates baked into sync scripts

1. **Geographic gate** — `isPointInVietnam(lng, lat)` from
   `scripts/data/vn-country-polygon.ts` rejects rows whose centroid
   falls outside the VN mainland polygon (catches China / Laos /
   Cambodia bleed across the Overpass bbox chunks).
2. **Name gate** — rows whose `name` contains zero Latin/Vietnamese
   letters (`/[A-Za-zÀ-ỹ]/`) are dropped (filters CJK / Khmer / Thai).
3. **Lock gate** — when an admin sets `osmLocked=true` or adds a column
   to `lockedFields`, the next sync skips that row entirely (or that
   column) so manual edits survive.

## Adding a new POI category

1. Add the enum value to `PoiCategory` in `prisma/schema.prisma` and
   create a Prisma migration that `ALTER TYPE "PoiCategory" ADD VALUE`.
2. Add the Overpass selector to `CATEGORY_QUERIES` in
   `scripts/sync-osm-poi.ts`.
3. Append the same enum value to the `POI_CATEGORIES` rotation list in
   `OsmSyncCronService` so the cron picks it up.
4. Add labels + icons + colour to `apps/web/lib/poi-api.ts` so the UI
   chips render.

That's it — `OsmSyncService.findLayer('poi', 'YOUR_CAT')` will return a
def automatically because `SYNC_LAYERS` is generated from the enum keys.

## Operational runbook

* **Sync hangs / 504 from Overpass** — `kubectl describe pod` on the
  Kaniko-style sync runner shows the chunk in flight. The script has
  a 5× retry on the clone step (HTTP 504 from Gitea is transient).
  For Overpass itself, raise the per-script `[out:json][timeout:N]`
  by editing the script. Default 180s for POI, 300s for boundaries.
* **Runs stuck in `RUNNING` state** — `OsmSyncOrchestrator` writes the
  row before spawning the script. If the script process dies without
  emitting an `exit` event, the row stays RUNNING. Mitigation: cron
  job to flip RUNNING > 6h old to FAILED with `errorMessage='timeout'`.
* **Conflict logs** — when sync updates a column the admin had locked,
  it skips the column silently. There is no separate conflict table
  (yet). To audit, search Loki for `[osm-sync] skipping locked field`.

## Phase status

| Phase | Status | Notes |
|-------|--------|-------|
| 0 — Admin boundaries + GeoLookupService | ✅ Schema, sync, service done. Provinces synced (33), districts in progress |
| 1 — POI catalog + sync | ✅ Schema + sync script + NestJS module + sidebar component done. Hospital category synced (~500 rows) |
| 2 — Transport (metro/railway/airport) | 🟡 Stations synced via POI; lines layer pending |
| 3 — Buildings / landuse | ⏳ Deferred — admin says low priority |
| 4 — Sync orchestrator + admin dashboard | ✅ Service + cron + Prometheus-friendly stats + admin UI done |
| 5 — User-facing UX | 🟡 Listing + KCN sidebar wired; search filter widget built; map overlays pending |
| 6 — Performance hardening | ⏳ Materialized views + Redis cache pending |