diff --git a/services/collector/src/entities/session-fingerprint.entity.ts b/services/collector/src/entities/session-fingerprint.entity.ts
index c851a2a..b594431 100644
--- a/services/collector/src/entities/session-fingerprint.entity.ts
+++ b/services/collector/src/entities/session-fingerprint.entity.ts
@@ -5,6 +5,7 @@ import {
   CreateDateColumn,
   UpdateDateColumn,
   Index,
+  Unique,
 } from 'typeorm';
 
 /**
@@ -13,7 +14,7 @@ import {
  * IP addresses are NEVER stored - only hashed for audit purposes
  */
 @Entity('session_fingerprints')
-@Index(['sessionId'], { unique: true })
+@Unique(['sessionId'])
 @Index(['userId'])
 @Index(['trafficSource'])
 @Index(['createdAt'])