fix: suppress Pulsar C++ client log noise (#936)

Revert consumer receive timeout from 100ms back to the original
2000ms.  The 100ms change was based on a misunderstanding — receive()
is a blocking call that returns immediately when a message arrives,
so the timeout only affects how quickly a consumer checks the shutdown
flag during idle periods.  100ms generated ~200 WARN lines/sec from
the C++ client with no latency benefit.

Also set the Pulsar C++ client logger to Error level so residual
timeout warnings from the subscriber (250ms) don't produce noise.

Update poll timeout test to match reverted 2000ms value

tests/unit/test_concurrency/test_consumer_concurrency.py

@@ -272,23 +272,22 @@ class TestMetricsIntegration:
 class TestPollTimeout:
 
     @pytest.mark.asyncio
-    async def test_poll_timeout_is_100ms(self):
-        """Consumer receive timeout should be 100ms, not the original 2000ms.
+    async def test_poll_timeout_is_2000ms(self):
+        """Consumer receive timeout should be 2000ms.
 
-        A 2000ms poll timeout means every service adds up to 2s of idle
-        blocking between message bursts. With many sequential hops in a
-        query pipeline, this compounds into seconds of unnecessary latency.
-        100ms keeps responsiveness high without significant CPU overhead.
+        receive() is a blocking call that returns immediately when a
+        message arrives — the timeout only governs how often the loop
+        checks the shutdown flag during idle periods.  Lower values
+        (e.g. 100ms) generate excessive C++ client WARN logging with
+        no latency benefit.
         """
         consumer = _make_consumer()
 
-        # Wire up a mock Pulsar consumer that records the receive kwargs
         mock_pulsar_consumer = MagicMock()
         received_kwargs = {}
 
         def capture_receive(**kwargs):
             received_kwargs.update(kwargs)
-            # Stop after one call
             consumer.running = False
             raise type('Timeout', (Exception,), {})("timeout")
 
@@ -296,7 +295,7 @@ class TestPollTimeout:
 
         await consumer.consume_from_queue(mock_pulsar_consumer)
 
-        assert received_kwargs.get("timeout_millis") == 100
+        assert received_kwargs.get("timeout_millis") == 2000
 
 
 # ---------------------------------------------------------------------------

trustgraph-base/trustgraph/base/consumer.py

@@ -188,7 +188,7 @@ class Consumer:
             try:
                 msg = await loop.run_in_executor(
                     executor,
-                    lambda: consumer.receive(timeout_millis=100),
+                    lambda: consumer.receive(timeout_millis=2000),
                 )
             except Exception as e:
                 # Handle timeout from any backend

trustgraph-base/trustgraph/base/pulsar_backend.py

@@ -139,6 +139,10 @@ class PulsarBackend:
         if api_key:
             client_args['authentication'] = pulsar.AuthenticationToken(api_key)
 
+        client_args['logger'] = pulsar.ConsoleLogger(
+            _pulsar.LoggerLevel.Error
+        )
+
         self.client = pulsar.Client(**client_args)
         logger.info(f"Pulsar client connected to {host}")