diff --git a/services/tracking/cross_camera_reid.py b/services/tracking/cross_camera_reid.py
index 28b7c2b..a071486 100644
--- a/services/tracking/cross_camera_reid.py
+++ b/services/tracking/cross_camera_reid.py
@@ -228,7 +228,13 @@ def _fetch_candidates(
         """Return all live embedding records that belong to other cameras."""
         pattern = "embed:*"
         # KEYS is fine for small deployments; use SCAN for production scale
-        all_keys: list[bytes] = self._r.keys(pattern)
+        all_keys = []
+        cursor = 0
+        while True:
+            cursor, batch = self._r.scan(cursor, match=pattern, count=100)
+            all_keys.extend(batch)
+            if cursor == 0:
+                break
         records: list[EmbeddingRecord] = []
 
         for raw_key in all_keys: