diff --git a/backend/app/services/site_finder/noise_loader.py b/backend/app/services/site_finder/noise_loader.py
index cc2f4f6e..30802325 100644
--- a/backend/app/services/site_finder/noise_loader.py
+++ b/backend/app/services/site_finder/noise_loader.py
@@ -126,6 +126,11 @@ def _way_to_polygon_wkt(nodes: list[dict]) -> str | None:
 
     Используется для natural=water (озёра, пруды). Если кольцо не замкнуто
     автоматически — добавляем первую точку в конец.
+
+    PostGIS отвергает linear ring < 4 точек. Замкнутый way из 3 точек
+    [A, B, A] (points[0]==points[-1]) даёт POLYGON((A,B,A)) — "geometry
+    requires more points". Возвращаем None, чтобы caller сделал fallback
+    на LineString или пропустил элемент.
     """
     points = [f"{n['lon']} {n['lat']}" for n in nodes if "lon" in n and "lat" in n]
     if len(points) < 3:
@@ -133,6 +138,9 @@ def _way_to_polygon_wkt(nodes: list[dict]) -> str | None:
     # Замкнуть кольцо если нужно
     if points[0] != points[-1]:
         points.append(points[0])
+    # Итоговое кольцо должно содержать ≥4 точек (PostGIS требование).
+    if len(points) < 4:
+        return None
     return f"POLYGON(({', '.join(points)}))"
 
 
@@ -203,35 +211,50 @@ def sync_noise_sources_to_db() -> dict[str, int]:
                 **geom_params,
             }
 
-            result = db.execute(
-                text(f"""
-                    INSERT INTO osm_noise_sources_ekb
-                        (osm_type, osm_id, source_type, road_class, name, geom, tags, fetched_at)
-                    VALUES (
-                        :osm_type, :osm_id, :source_type, :road_class, :name,
-                        {geom_sql},
-                        CAST(:tags AS jsonb), NOW()
-                    )
-                    ON CONFLICT (osm_type, osm_id) DO UPDATE
-                       SET source_type = EXCLUDED.source_type,
-                           road_class  = EXCLUDED.road_class,
-                           name        = EXCLUDED.name,
-                           geom        = EXCLUDED.geom,
-                           tags        = EXCLUDED.tags,
-                           fetched_at  = NOW()
-                    RETURNING (xmax = 0) AS is_insert
-                """),
-                params,
-            ).scalar()
-
-            if result:
-                inserted += 1
-            else:
-                updated += 1
+            try:
+                with db.begin_nested():  # SAVEPOINT — откат только этой записи
+                    result = db.execute(
+                        text(f"""
+                            INSERT INTO osm_noise_sources_ekb
+                                (osm_type, osm_id, source_type, road_class, name, geom, tags,
+                                 fetched_at)
+                            VALUES (
+                                :osm_type, :osm_id, :source_type, :road_class, :name,
+                                {geom_sql},
+                                CAST(:tags AS jsonb), NOW()
+                            )
+                            ON CONFLICT (osm_type, osm_id) DO UPDATE
+                               SET source_type = EXCLUDED.source_type,
+                                   road_class  = EXCLUDED.road_class,
+                                   name        = EXCLUDED.name,
+                                   geom        = EXCLUDED.geom,
+                                   tags        = EXCLUDED.tags,
+                                   fetched_at  = NOW()
+                            RETURNING (xmax = 0) AS is_insert
+                        """),
+                        params,
+                    ).scalar()
+                if result:
+                    inserted += 1
+                else:
+                    updated += 1
+            except Exception as e:
+                # Дефектный way (например, 3-точечное замкнутое кольцо POLYGON((A,B,A))
+                # отвергается PostGIS) не должен валить весь weekly-sync. SAVEPOINT
+                # откатывает только эту строку, продолжаем с остальными.
+                logger.warning(
+                    "noise_sync insert failed for %s/%s (source_type=%s): %s",
+                    osm_type,
+                    osm_id,
+                    source_type,
+                    e,
+                )
+                skipped += 1
 
         db.commit()
-    except Exception:
+    except Exception as e:
         db.rollback()
+        logger.exception("noise_sync: unexpected error, outer tx rolled back: %s", e)
         raise
     finally:
         db.close()