Add Clear Data button to wipe county data folders

web/server.py

@@ -251,6 +251,28 @@ def cancel_job():
     except Exception as e:
         return jsonify({'error': str(e)}), 500
 
+@app.route('/api/clear-data', methods=['POST'])
+def clear_data():
+    """Delete all files from every county data directory under /data."""
+    counties = get_counties()
+    removed = []
+    errors = []
+    for county in counties:
+        county_dir = f'/data/{county["id"]}'
+        if not os.path.isdir(county_dir):
+            continue
+        for fname in os.listdir(county_dir):
+            fpath = os.path.join(county_dir, fname)
+            if os.path.isfile(fpath):
+                try:
+                    os.remove(fpath)
+                    removed.append(f'{county["id"]}/{fname}')
+                except Exception as e:
+                    errors.append(str(e))
+    if errors:
+        return jsonify({'error': '; '.join(errors)}), 500
+    return jsonify({'success': True, 'removed': removed})
+
 @app.route('/api/upload-file', methods=['POST'])
 def upload_file():
     """Upload a shapefile ZIP to a path under /data"""