feat(gateway): DataSink.publish_reading multi-name fan-out

tests/unit/io/test_data_sink_publish.py

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+from unittest.mock import AsyncMock
+
+import pytest
+
+import ingestor.metrics as metrics
+from ingestor.io.data_sink import DataSink
+
+
+def make_sink(data_manager=None):
+    dm = data_manager or AsyncMock()
+    sink = DataSink(data_manager=dm, postgres=AsyncMock())
+    sink.emit_metric = AsyncMock()
+    return sink, dm
+
+
+@pytest.mark.asyncio
+async def test_publish_reading_fans_out_per_name():
+    sink, dm = make_sink()
+    names = [
+        {'collection': 'raw_x', 'tag_name': 'Counter', 'model_id': '1', 'model_name': 'm1'},
+        {'collection': 'raw_y', 'tag_name': 'Contador', 'model_id': '2', 'model_name': 'm2'},
+    ]
+
+    await sink.publish_reading(
+        tag='ns=2;i=2', value=42, timestamp='2026-07-13T00:00:00Z', names=names
+    )
+
+    assert dm.publish.await_count == 2
+
+
+@pytest.mark.asyncio
+async def test_publish_reading_builds_doc_and_routes_collection():
+    sink, dm = make_sink()
+    names = [{'collection': 'raw_x', 'tag_name': 'Counter', 'model_id': '1', 'model_name': 'm1'}]
+
+    await sink.publish_reading(
+        tag='ns=2;i=2', value=42, timestamp='2026-07-13T00:00:00Z', names=names
+    )
+
+    collection, doc = dm.publish.await_args_list[0].args
+    assert collection == 'raw_x'
+    assert doc == {
+        'tag': 'ns=2;i=2',
+        'name': 'Counter',
+        'model_id': '1',
+        'timestamp': '2026-07-13T00:00:00Z',
+        'value': 42,
+    }
+
+
+@pytest.mark.asyncio
+async def test_publish_reading_emits_tag_value_metric_per_name():
+    sink, dm = make_sink()
+    names = [
+        {'collection': 'raw_x', 'tag_name': 'Counter', 'model_id': '1', 'model_name': 'm1'},
+        {'collection': 'raw_y', 'tag_name': 'Contador', 'model_id': '2', 'model_name': 'm2'},
+    ]
+
+    await sink.publish_reading(
+        tag='ns=2;i=2', value=42, timestamp='2026-07-13T00:00:00Z', names=names
+    )
+
+    assert sink.emit_metric.await_count == 2
+    sink.emit_metric.assert_any_await(
+        metric_object=metrics.OPC_TAG_VALUE,
+        method='set',
+        value=42,
+        tags={'pod_id': dm.pod_id, 'tag_name': 'Counter', 'model_id': '1'},
+    )