Name saved files with county, data type, and data date

web/server.py

@@ -278,6 +278,15 @@ def list_files():
 
     return jsonify(files)
 
+@app.route('/api/latest-date')
+def latest_date():
+    """Return the folder name that /data/latest symlinks to (used as data date in filenames)."""
+    try:
+        target = os.path.basename(os.path.realpath('/data/latest'))
+        return jsonify({'date': target})
+    except Exception:
+        return jsonify({'date': ''})
+
 @app.route('/data/<path:filename>')
 def serve_data(filename):
     """Serve GeoJSON files"""

web/static/map.js

@@ -21,6 +21,8 @@ let multiSelectMode = false;
 
 // Mobile controls state
 let mobileControlsOpen = false;
+let loadedCounty = '';
+let loadedDataType = '';
 
 // Initialize map
 function initMap() {
@@ -926,6 +928,8 @@ async function loadFiles() {
 
         const county = document.getElementById('countySelect').value;
         const dataType = document.getElementById('dataTypeSelect').value;
+        loadedCounty = county;
+        loadedDataType = dataType;
 
         // Build file paths based on county and data type
         let osmFile, diffFile, countyFile, diffAddedFile, diffRemovedFile;
@@ -1055,43 +1059,29 @@ async function saveAcceptedItems() {
             }
         });
 
-        // Create and download added-approved.geojson
+        // Get the date of the loaded data from the server
-        if (acceptedAdded.length > 0) {
+        let dataDate = '';
-            const addedData = {
+        try {
-                type: 'FeatureCollection',
+            const dateResp = await fetch('/api/latest-date');
-                features: acceptedAdded
+            if (dateResp.ok) dataDate = (await dateResp.json()).date || '';
-            };
+        } catch (_) {}
-            const addedStr = JSON.stringify(addedData, null, 2);
+        const prefix = [loadedCounty, loadedDataType, dataDate].filter(Boolean).join('-');
-            const addedBlob = new Blob([addedStr], { type: 'application/json' });
-            const addedUrl = URL.createObjectURL(addedBlob);
 
-            const addedLink = document.createElement('a');
+        function triggerDownload(features, label) {
-            addedLink.href = addedUrl;
+            const blob = new Blob([JSON.stringify({ type: 'FeatureCollection', features }, null, 2)],
-            addedLink.download = 'added-approved.geojson';
+                                  { type: 'application/json' });
-            document.body.appendChild(addedLink);
+            const url = URL.createObjectURL(blob);
-            addedLink.click();
+            const a = document.createElement('a');
-            document.body.removeChild(addedLink);
+            a.href = url;
-            URL.revokeObjectURL(addedUrl);
+            a.download = `${prefix}-${label}.geojson`;
+            document.body.appendChild(a);
+            a.click();
+            document.body.removeChild(a);
+            URL.revokeObjectURL(url);
         }
 
-        // Create and download removed-approved.geojson
+        if (acceptedAdded.length > 0)   triggerDownload(acceptedAdded,   'added-approved');
-        if (acceptedRemoved.length > 0) {
+        if (acceptedRemoved.length > 0) triggerDownload(acceptedRemoved, 'removed-approved');
-            const removedData = {
-                type: 'FeatureCollection',
-                features: acceptedRemoved
-            };
-            const removedStr = JSON.stringify(removedData, null, 2);
-            const removedBlob = new Blob([removedStr], { type: 'application/json' });
-            const removedUrl = URL.createObjectURL(removedBlob);
-
-            const removedLink = document.createElement('a');
-            removedLink.href = removedUrl;
-            removedLink.download = 'removed-approved.geojson';
-            document.body.appendChild(removedLink);
-            removedLink.click();
-            document.body.removeChild(removedLink);
-            URL.revokeObjectURL(removedUrl);
-        }
 
         showStatus(`Saved ${acceptedAdded.length} added, ${acceptedRemoved.length} removed (approved only)`, 'success');