fix(data): enforce canonical city slugs

data/places.schema.json

@@ -24,6 +24,7 @@
     "city": {
       "type": "string",
       "minLength": 1,
+      "pattern": "^[a-z0-9]+(_[a-z0-9]+)*$",
       "description": "Lowercase, underscore-separated slug, e.g. \"mumbai\", \"navi_mumbai\". Any city worldwide is welcome, not a fixed enum."
     },
     "lat": {

data/places/library.json

@@ -267,7 +267,7 @@
     "id": "xiamen-library-01",
     "name": "厦门图书馆集美新城馆东南门",
     "type": "library",
-    "city": "厦门",
+    "city": "xiamen",
     "lat": 24.59441,
     "lng": 118.05789,
     "address": "福建省厦门市集美区诚毅中路380号",

data/places/sat_centre.json

@@ -250,7 +250,7 @@
     "id": "delhi-ncr-sat-01",
     "name": "American Embassy School",
     "type": "sat_centre",
-    "city": "new delhi",
+    "city": "new_delhi",
     "lat": 28.598015,
     "lng": 77.182659,
     "address": "CHANDRAGUPTA MARG, CHANAKYAPURI, NEW DELHI, DELHI",
@@ -263,7 +263,7 @@
     "id": "delhi-ncr-sat-02",
     "name": "Amity International School",
     "type": "sat_centre",
-    "city": "new delhi",
+    "city": "new_delhi",
     "lat": 28.613895,
     "lng": 77.209006,
     "address": "SECTOR 7, PUSHP VIHAR, NEW DELHI, DELHI",
@@ -276,7 +276,7 @@
     "id": "delhi-ncr-sat-03",
     "name": "The British School",
     "type": "sat_centre",
-    "city": "new delhi",
+    "city": "new_delhi",
     "lat": 28.597247,
     "lng": 77.180085,
     "address": "DR. JOSE P. RIZAL MARG, CHANAKYAPURI, NEW DELHI, DELHI",
@@ -2330,7 +2330,7 @@
     "id": "04489",
     "name": "Academy at Palumbo",
     "type": "sat_centre",
-    "city": "philadephia",
+    "city": "philadelphia",
     "lat": 39.9400517,
     "lng": -75.1615327,
     "address": "1100 CATHARINE STREET",

scripts/validate-places.mjs

@@ -10,6 +10,7 @@
  *   - Unique id within each file and across all files
  *   - type is one of the schema's enum values
  *   - type matches the filename it lives in
+ *   - city is a lowercase, underscore-separated slug
  *   - id matches the <city-prefix>-<type>-<number> convention, or is a bare
  *     numeric id (the College Board SAT centre code convention)
  *   - lat/lng are numbers within the schema's min/max bounds
@@ -43,6 +44,7 @@ const BOUNDS = {
   maxLng: schema.properties.lng.maximum,
 };
 const GMAPS_RE = new RegExp(schema.properties.gmaps_link.pattern);
+const CITY_SLUG_RE = new RegExp(schema.properties.city.pattern);
 
 // <city-prefix>-<type>-<number>, allowing multi-segment city/type prefixes
 // (e.g. "delhi-ncr-sat-01", "mum-airport-terminal-01"), or a bare numeric id
@@ -155,6 +157,17 @@ for (const file of files) {
       );
     }
 
+    // city must use the canonical lowercase, underscore-separated slug form
+    if (
+      r.city !== undefined &&
+      (typeof r.city !== "string" || !CITY_SLUG_RE.test(r.city))
+    ) {
+      err(
+        loc,
+        `city must be a lowercase, underscore-separated slug, got ${JSON.stringify(r.city)}`,
+      );
+    }
+
     // valid_till format, when present
     if (r.valid_till !== undefined && !isRealIsoDate(r.valid_till)) {
       err(loc, `valid_till must be a real ISO date (YYYY-MM-DD), got "${r.valid_till}"`);

src/app/docs/(article)/places-api/page.tsx

@@ -46,7 +46,7 @@ const FILTERS: { name: string; type: string; notes: string }[] = [
     name: "city",
     type: "string",
     notes:
-      "Case-insensitive; spaces and hyphens are normalized to the dataset's underscore slugs (e.g. `New Delhi` matches `new delhi`). No matching city returns an empty `data` array.",
+      "Case-insensitive; spaces and hyphens are normalized to the dataset's underscore slugs (e.g. `New Delhi` matches `new_delhi`). No matching city returns an empty `data` array.",
   },
   {
     name: "category",