one query for pois

backend/src/models/poi.rs

@@ -16,10 +16,21 @@ pub struct PoiRow {
     pub wheelchair: Option<String>,
 }
 
-/// Count row for total matching POIs.
+/// POI row with window-function total (replaces separate COUNT query).
 #[derive(Debug, sqlx::FromRow)]
-pub struct CountRow {
-    pub count: Option<i64>,
+pub struct PoiRowWithTotal {
+    pub osm_id: i64,
+    pub osm_type: String,
+    pub name: String,
+    pub category: String,
+    pub geometry: serde_json::Value,
+    pub address: Option<serde_json::Value>,
+    pub tags: Option<serde_json::Value>,
+    pub opening_hours: Option<String>,
+    pub phone: Option<String>,
+    pub website: Option<String>,
+    pub wheelchair: Option<String>,
+    pub total: Option<i64>,
 }
 
 /// Address sub-object in the API response.
@@ -86,6 +97,39 @@ pub struct PaginationMetadata {
 }
 
 /// Converts a database row into a GeoJSON Feature.
+impl PoiRowWithTotal {
+    pub fn into_feature(self) -> PoiFeature {
+        let address: Option<PoiAddress> = self
+            .address
+            .as_ref()
+            .and_then(|v| serde_json::from_value(v.clone()).ok());
+
+        let opening_hours_parsed = self.opening_hours.as_ref().map(|_oh| OpeningHoursParsed {
+            is_open: true,
+            today: None,
+            next_change: None,
+        });
+
+        PoiFeature {
+            r#type: "Feature".into(),
+            geometry: self.geometry,
+            properties: PoiProperties {
+                osm_id: self.osm_id,
+                osm_type: self.osm_type,
+                name: self.name,
+                category: self.category,
+                address,
+                opening_hours: self.opening_hours,
+                opening_hours_parsed,
+                phone: self.phone,
+                website: self.website,
+                wheelchair: self.wheelchair,
+                tags: self.tags,
+            },
+        }
+    }
+}
+
 impl PoiRow {
     pub fn into_feature(self) -> PoiFeature {
         let address: Option<PoiAddress> = self

backend/src/routes/pois.rs

@@ -72,43 +72,13 @@ pub async fn list_pois(
         None
     };
 
-    // Build and execute the count query
-    let total = if let Some(ref cats) = categories {
-        sqlx::query_as::<_, CountRow>(
-            "SELECT COUNT(*) as count FROM pois \
-             WHERE geometry && ST_MakeEnvelope($1, $2, $3, $4, 4326) \
-             AND category = ANY($5)",
-        )
-        .bind(min_lon)
-        .bind(min_lat)
-        .bind(max_lon)
-        .bind(max_lat)
-        .bind(cats)
-        .fetch_one(pool.get_ref())
-        .await?
-        .count
-        .unwrap_or(0)
-    } else {
-        sqlx::query_as::<_, CountRow>(
-            "SELECT COUNT(*) as count FROM pois \
-             WHERE geometry && ST_MakeEnvelope($1, $2, $3, $4, 4326)",
-        )
-        .bind(min_lon)
-        .bind(min_lat)
-        .bind(max_lon)
-        .bind(max_lat)
-        .fetch_one(pool.get_ref())
-        .await?
-        .count
-        .unwrap_or(0)
-    };
-
-    // Build and execute the data query
-    let rows: Vec<PoiRow> = if let Some(ref cats) = categories {
-        sqlx::query_as::<_, PoiRow>(
+    // Single query: window function computes total within the same spatial scan.
+    let rows: Vec<PoiRowWithTotal> = if let Some(ref cats) = categories {
+        sqlx::query_as::<_, PoiRowWithTotal>(
             "SELECT osm_id, osm_type, name, category, \
                     ST_AsGeoJSON(geometry)::json AS geometry, \
-                    address, tags, opening_hours, phone, website, wheelchair \
+                    address, tags, opening_hours, phone, website, wheelchair, \
+                    COUNT(*) OVER() AS total \
              FROM pois \
              WHERE geometry && ST_MakeEnvelope($1, $2, $3, $4, 4326) \
              AND category = ANY($5) \
@@ -125,10 +95,11 @@ pub async fn list_pois(
         .fetch_all(pool.get_ref())
         .await?
     } else {
-        sqlx::query_as::<_, PoiRow>(
+        sqlx::query_as::<_, PoiRowWithTotal>(
             "SELECT osm_id, osm_type, name, category, \
                     ST_AsGeoJSON(geometry)::json AS geometry, \
-                    address, tags, opening_hours, phone, website, wheelchair \
+                    address, tags, opening_hours, phone, website, wheelchair, \
+                    COUNT(*) OVER() AS total \
              FROM pois \
              WHERE geometry && ST_MakeEnvelope($1, $2, $3, $4, 4326) \
              ORDER BY name \
@@ -144,6 +115,7 @@ pub async fn list_pois(
         .await?
     };
 
+    let total = rows.first().and_then(|r| r.total).unwrap_or(0);
     let features: Vec<PoiFeature> = rows.into_iter().map(|r| r.into_feature()).collect();
 
     let response = PoiFeatureCollection {