fix(phase26): batch geocode endpoint for faster server trip scrubber

static/js/history.js

@@ -40,7 +40,6 @@
     }
 
     function preloadGeocodes(points) {
-        // Collect unique rounded coordinates and batch-fetch all labels upfront.
         _geoCache = {};
         const seen = new Set();
         const queue = [];
@@ -50,25 +49,27 @@
             seen.add(key);
             queue.push({ key, lat: p.latitude, lon: p.longitude });
         }
+        if (!queue.length) return;
 
-        // Fetch in parallel with a small concurrency cap
-        const CONCURRENCY = 4;
-        let idx = 0;
-        function next() {
-            if (idx >= queue.length) return;
-            const item = queue[idx++];
-            const ctrl = new AbortController();
-            const t = setTimeout(() => ctrl.abort(), 4000);
-            return fetch(`/api/geocode?lat=${item.lat}&lon=${item.lon}`, { signal: ctrl.signal })
-                .then(r => { clearTimeout(t); return r.ok ? r.json() : null; })
-                .then(data => {
-                    _geoCache[item.key] = (data && data.label) || null;
-                })
-                .catch(() => { clearTimeout(t); _geoCache[item.key] = null; })
-                .finally(() => next());
-        }
-        // Start initial batch
-        for (let i = 0; i < CONCURRENCY && i < queue.length; i++) next();
+        // Try batch endpoint first (server has it, Pi falls back to 404)
+        const coords = queue.map(q => ({lat: q.lat, lon: q.lon}));
+        const ctrl = new AbortController();
+        const t = setTimeout(() => ctrl.abort(), 15000);
+        fetch('/api/geocode/batch', {
+            method: 'POST',
+            headers: {'Content-Type': 'application/json'},
+            body: JSON.stringify({coords: coords}),
+            signal: ctrl.signal,
+        })
+        .then(r => { clearTimeout(t); return r.ok ? r.json() : null; })
+        .then(data => {
+            if (data) {
+                for (const q of queue) {
+                    if (data[q.key]) _geoCache[q.key] = data[q.key];
+                }
+            }
+        })
+        .catch(() => { clearTimeout(t); });
     }
 
     function geocodePoint(lat, lon) {