regression in conveyor database partition variable name
Motivation
----------
The database table is "requests". By error, we try to access "request" (singular). 



diff --git a/lib/rucio/core/transfer.py b/lib/rucio/core/transfer.py
index 14274a6a1..2d8c887a3 100644
--- a/lib/rucio/core/transfer.py
+++ b/lib/rucio/core/transfer.py
@@ -1565,7 +1565,7 @@ def __list_transfer_requests_and_source_replicas(
     """
 
     if partition_hash_var is None:
-        partition_hash_var = 'request.id'
+        partition_hash_var = 'requests.id'
 
     if request_state is None:
         request_state = RequestState.QUEUED
['lib/rucio/core/transfer.py']