sadfasdf

backend/src/routes/properties.js

@@ -107,7 +107,13 @@ const sanitizePolygon = (coords) => {
     } else { return [pts[0], pts[pts.length-1]]; }
   };
   try { filtered = rdp(filtered, EPS_DEG); } catch {}
-  return filtered;
+  // Ensure at least 3 unique points remain; if not, fall back to original coords
+  const unique = [];
+  for (const p of filtered) {
+    if (!unique.some(q => Math.abs(q[0]-p[0])<1e-9 && Math.abs(q[1]-p[1])<1e-9)) unique.push(p);
+  }
+  if (unique.length < 3) return coords;
+  return unique;
 };
 
 // @route   GET /api/properties