diff --git a/backend/app/api/v1/parcels.py b/backend/app/api/v1/parcels.py
index cfb5d396..8b65121f 100644
--- a/backend/app/api/v1/parcels.py
+++ b/backend/app/api/v1/parcels.py
@@ -1808,11 +1808,15 @@ def analyze_parcel(
     pipeline_24mo = _aggregate_pipeline(pipeline_rows)
 
     # D2 (#34): velocity-score — темп продаж конкурентов вокруг участка.
+    # SAVEPOINT защищает outer transaction если velocity SQL падает —
+    # иначе следующие queries (_geotech_risk и пр.) крашатся
+    # с InFailedSqlTransaction.
     velocity_data: dict[str, Any] | None = None
     try:
-        v_result = compute_velocity(db, parcel_geom_wkt=geom_wkt, radius_km=3.0)
-        if v_result is not None:
-            velocity_data = v_result.as_dict()
+        with db.begin_nested():
+            v_result = compute_velocity(db, parcel_geom_wkt=geom_wkt, radius_km=3.0)
+            if v_result is not None:
+                velocity_data = v_result.as_dict()
     except Exception as _ve:
         logger.warning("velocity compute failed for %s: %s", cad_num, _ve)