fix(proxy): attribute /v1/messages spend rows to /messages in daily activity

Anthropic-native /v1/messages requests are logged with call type
anthropic_messages, which had no entry in ROUTE_ENDPOINT_MAPPING. Their
daily spend rows were written with no endpoint, so Usage > Endpoint
Activity never showed /messages traffic even though model, key and
provider views counted it

Map anthropic_messages to /messages. The missing-param error for the
route now names /messages instead of the raw route type, matching the
other mapped routes

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

litellm/proxy/route_llm_request.py

@@ -155,6 +155,7 @@ ROUTE_ENDPOINT_MAPPING: Final = {
     "arerank": "/rerank",
     "aresponses": "/responses",
     "_aresponses_websocket": "/responses",
+    "anthropic_messages": "/messages",
     "alist_input_items": "/responses/{response_id}/input_items",
     "aimage_edit": "/images/edits",
     "acancel_responses": "/responses/{response_id}/cancel",

tests/unit/proxy/db/test_db_spend_update_writer.py

@@ -1852,6 +1852,45 @@ async def test_endpoint_field_maps_retrieve_batch_spend_row_to_batches_endpoint(
         assert transaction["endpoint"] == "/batches"
 
 
+@pytest.mark.asyncio
+async def test_endpoint_field_maps_anthropic_messages_spend_row_to_messages_endpoint():
+    writer = DBSpendUpdateWriter()
+    mock_prisma = MagicMock()
+    mock_prisma.get_request_status = MagicMock(return_value="success")
+
+    payload = {
+        "request_id": "req-anthropic-messages",
+        "user": "test-user",
+        "call_type": "anthropic_messages",
+        "startTime": "2024-01-01T12:00:00",
+        "api_key": "test-key",
+        "model": "claude-sonnet-4-5",
+        "custom_llm_provider": "anthropic",
+        "model_group": "claude-sonnet-4-5",
+        "prompt_tokens": 15,
+        "completion_tokens": 10,
+        "spend": 0.0175,
+        "metadata": '{"usage_object": {}}',
+    }
+
+    writer.daily_spend_update_queue.add_update = AsyncMock()
+
+    await writer.add_spend_log_transaction_to_daily_user_transaction(
+        payload=payload,
+        prisma_client=mock_prisma,
+    )
+
+    writer.daily_spend_update_queue.add_update.assert_called_once()
+
+    call_args = writer.daily_spend_update_queue.add_update.call_args[1]
+    update_dict = call_args["update"]
+    assert len(update_dict) == 1
+
+    for key, transaction in update_dict.items():
+        assert key == "test-user_2024-01-01_test-key_claude-sonnet-4-5_anthropic_/messages"
+        assert transaction["endpoint"] == "/messages"
+
+
 @pytest.mark.asyncio
 async def test_update_daily_spend_logs_detailed_error_on_batch_upsert_failure():
     """

tests/unit/proxy/test_route_llm_request.py

@@ -1485,7 +1485,7 @@ async def test_route_request_keeps_key_fallbacks_out_of_pass_through_provider_bo
         ("atranscription", "file", "/audio/transcriptions"),
         ("arerank", "query", "/rerank"),
         ("acompact_responses", "input", "/responses/compact"),
-        ("anthropic_messages", "messages", "anthropic_messages"),
+        ("anthropic_messages", "messages", "/messages"),
         ("agenerate_content", "contents", "agenerate_content"),
         ("aocr", "document", "/ocr"),
         ("avector_store_search", "query", "avector_store_search"),