diff --git a/apps/api/src/maps/road-stat.entity.ts b/apps/api/src/maps/road-stat.entity.ts
index 9e3ba03..1240c43 100644
--- a/apps/api/src/maps/road-stat.entity.ts
+++ b/apps/api/src/maps/road-stat.entity.ts
@@ -1,6 +1,7 @@
 import { Entity, Column, PrimaryColumn, Index } from 'typeorm';
 
 @Entity('road_segment_stats')
+@Index('idx_segment_congestion', ['congestionFactor'], { where: '"congestionFactor" > 1.1' })
 export class RoadSegmentStat {
   @PrimaryColumn()
   segmentId: string; // OSM Way ID or similar