diff --git a/backend/routes/allowlist.py b/backend/routes/allowlist.py
index a0efa19f320..96e224a7dc6 100644
--- a/backend/routes/allowlist.py
+++ b/backend/routes/allowlist.py
@@ -44,6 +44,7 @@ BACKEND_PATH_PREFIXES: tuple[str, ...] = (
     "/router/",
     "/router_settings",
     "/adaptive_router/",
+    "/auto_router/",
     "/fallback",
     "/fallbacks",
     "/cache_settings",
diff --git a/litellm/proxy/db/db_transaction_queue/spend_log_cleanup.py b/litellm/proxy/db/db_transaction_queue/spend_log_cleanup.py
index 3c423ff1dfb..c2baa7f6da1 100644
--- a/litellm/proxy/db/db_transaction_queue/spend_log_cleanup.py
+++ b/litellm/proxy/db/db_transaction_queue/spend_log_cleanup.py
@@ -258,7 +258,7 @@ class SpendLogCleanup:
             verbose_proxy_logger.info("Deleted %s expired tool index rows", index_deleted)
 
             sessions_deleted = await self._delete_old_auto_router_sessions(prisma_client, cutoff_date)
-            verbose_proxy_logger.info(f"Deleted {sessions_deleted} expired auto-router session rollups")
+            verbose_proxy_logger.info("Deleted %s expired auto-router session rollups", sessions_deleted)
 
         except Exception as e:
             # .exception() captures the traceback; str(e) alone on a Prisma/DB
diff --git a/tests/test_litellm/proxy/test_spend_log_cleanup.py b/tests/test_litellm/proxy/test_spend_log_cleanup.py
index 2ba9257e1da..890ced6791f 100644
--- a/tests/test_litellm/proxy/test_spend_log_cleanup.py
+++ b/tests/test_litellm/proxy/test_spend_log_cleanup.py
@@ -158,8 +158,8 @@ async def test_cleanup_old_spend_logs_batch_deletion():
     mock_db = MagicMock()
 
     # Mock execute_raw to return deleted counts (3 spend-log batches, then the
-    # tool-index cleanup's first batch returning 0)
-    mock_db.execute_raw = AsyncMock(side_effect=[1000, 500, 0, 0])
+    # first batch of each derived table's cleanup returning 0)
+    mock_db.execute_raw = AsyncMock(side_effect=[1000, 500, 0, 0, 0])
 
     # Wire up mocks
     mock_prisma_client.db = mock_db
@@ -179,7 +179,7 @@ async def test_cleanup_old_spend_logs_batch_deletion():
     await cleaner.cleanup_old_spend_logs(mock_prisma_client)
 
     # Validate batching and deletion via raw SQL
-    assert mock_db.execute_raw.call_count == 4
+    assert mock_db.execute_raw.call_count == 5
 
     # Check the first call argument
     call_args_sql = mock_db.execute_raw.call_args_list[0][0][0]
@@ -193,6 +193,12 @@ async def test_cleanup_old_spend_logs_batch_deletion():
     tool_index_sql = mock_db.execute_raw.call_args_list[3][0][0]
     assert 'DELETE FROM "LiteLLM_SpendLogToolIndex"' in tool_index_sql
 
+    # So do the auto-router session rollups, keyed on last activity rather than
+    # session start so a live conversation is not pruned while still being written to
+    session_sql = mock_db.execute_raw.call_args_list[4][0][0]
+    assert 'DELETE FROM "LiteLLM_AutoRouterSession"' in session_sql
+    assert "last_turn_at" in session_sql
+
     # The LiteLLM_DailyToolSpend rollup must outlive spend-log retention: it is
     # the only copy of tool spend history once its per-request sources expire,
     # so spend-log cleanup must never touch it.
@@ -316,7 +322,7 @@ async def test_cleanup_uses_delete_when_not_partitioned():
     from unittest.mock import AsyncMock, MagicMock
 
     mock_prisma_client = MagicMock()
-    mock_prisma_client.db.execute_raw = AsyncMock(side_effect=[10, 0, 0])
+    mock_prisma_client.db.execute_raw = AsyncMock(side_effect=[10, 0, 0, 0])
 
     partition_manager = MagicMock()
     partition_manager.is_partitioned = AsyncMock(return_value=False)
@@ -335,7 +341,7 @@ async def test_cleanup_uses_delete_when_not_partitioned():
     await cleaner.cleanup_old_spend_logs(mock_prisma_client)
 
     partition_manager.drop_partitions_older_than.assert_not_awaited()
-    assert mock_prisma_client.db.execute_raw.await_count == 3
+    assert mock_prisma_client.db.execute_raw.await_count == 4
     delete_sql = mock_prisma_client.db.execute_raw.call_args_list[0][0][0]
     assert 'DELETE FROM "LiteLLM_SpendLogs"' in delete_sql