diff --git a/app/middleware/upload_rate_limit.py b/app/middleware/upload_rate_limit.py
index 949d3801..16b7d907 100644
--- a/app/middleware/upload_rate_limit.py
+++ b/app/middleware/upload_rate_limit.py
@@ -70,7 +70,7 @@ def _get_redis() -> redis.Redis | None:
         _redis_client.ping()
         return _redis_client
     except Exception:  # noqa: BLE001
-        logger.debug("Redis unavailable for upload rate limiter – falling back to allow-all")
+        logger.debug("Redis unavailable for upload rate limiter – falling back to allow-all", exc_info=True)
         _redis_client = None
         return None
 
@@ -87,7 +87,7 @@ def _get_queue_depth(r: redis.Redis) -> int:
         try:
             total += r.llen(queue_name)
         except Exception:  # noqa: BLE001, S110
-            logger.debug("Could not read queue length for '%s'", queue_name)
+            logger.debug("Could not read queue length for %r", queue_name, exc_info=True)
     return total
 
 
diff --git a/tests/test_upload_rate_limit.py b/tests/test_upload_rate_limit.py
index b5430f0f..4e23e6dc 100644
--- a/tests/test_upload_rate_limit.py
+++ b/tests/test_upload_rate_limit.py
@@ -82,9 +82,10 @@ class TestComputeEffectiveLimit:
         """A base limit of 0 (disabled) should clamp to at least 1."""
         effective, _factor, _reason = compute_effective_limit(0, queue_depth=0, cpu_load_ratio=0.0)
         # max(1, int(0 * 1.0)) = max(1, 0) = 1
-        # This is correct since a base_limit of 0 means "disabled" and is
-        # handled upstream (the dependency skips the check entirely).
-        assert effective >= 0
+        # A base_limit of 0 means "disabled" and is handled upstream
+        # (the dependency skips the check entirely), but the pure function
+        # still clamps to 1 as a safety net.
+        assert effective == 1
 
 
 # ---------------------------------------------------------------------------