fix(scada): align location capability and investigation guidance

tests/unit/test_scada_replay_queries.py

@@ -10,7 +10,7 @@ from fastapi import HTTPException
 
 from app.mcp.analysis_models import BurstLocationInput
 from app.mcp.catalog import TOOLS
-from app.mcp.models import BoundContext
+from app.mcp.models import BoundContext, ScadaInput
 from app.mcp import query_service
 from app.services.scada_replay_queries import replay_burst_location_inputs, replay_snapshot_rows
 
@@ -18,6 +18,30 @@ from app.services.scada_replay_queries import replay_burst_location_inputs, repl
 START = datetime(2026, 10, 8, tzinfo=timezone.utc)
 
 
+def test_replay_origin_is_preserved_without_a_provenance_only_data_gap(monkeypatch):
+    from app.services import scada_replay_queries
+
+    monkeypatch.setattr(query_service, "authorize_query", AsyncMock())
+    reading = {"time": START.isoformat(), "device_id": "P1", "cleaned_value": 20.0,
+               "monitored_value": 20.0, "quality": "valid"}
+    read = AsyncMock(return_value=[reading])
+    monkeypatch.setattr(scada_replay_queries, "replay_snapshot_rows", read)
+    project_id = uuid4()
+    context = {"replay_id": str(uuid4()), "knowledge_cutoff": (START + timedelta(minutes=15)).isoformat(),
+               "batch_sequence": 9}
+    connection = object()
+    scope = SimpleNamespace(connection=connection, project=SimpleNamespace(project_id=project_id))
+    binding = SimpleNamespace(replay_context=context)
+    args = ScadaInput(context_handle="a" * 43, device_ids=["P1"], start=START,
+                      end=START + timedelta(minutes=15))
+    result = asyncio.run(query_service.execute_query(scope, binding, TOOLS["query_scada_readings"], args))
+    assert result.origin == "synthetic"
+    assert result.data[0]["device_id"] == "P1"
+    assert result.data_gaps == []
+    read.assert_awaited_once_with(connection, project_id, context, ["P1"], args.start, args.end,
+                                  args.limit + 1, args.offset)
+
+
 class Cursor:
     def __init__(self, rows): self.rows = rows
     async def fetchone(self): return self.rows[0] if self.rows else None