refactor(db)!: clean up business SQL access

- make realtime replacement and analysis result writes transactional\n- consolidate SCADA repositories and remove process-global project state\n- validate SCADA batches and use indexed GIS-backed business queries\n\nBREAKING CHANGE: remove the public analysis result writer and the pipeline-health network_name query parameter.

tests/unit/test_scada_cleaning.py

@@ -1,4 +1,5 @@
 import asyncio
+from contextlib import asynccontextmanager
 from datetime import datetime, timezone
 from unittest.mock import AsyncMock
 
@@ -10,6 +11,12 @@ from app.api.v1.endpoints.timeseries import composite as composite_endpoint
 from app.infra.db.timescaledb import composite_queries
 
 
+class _FakeTimescaleConnection:
+    @asynccontextmanager
+    async def transaction(self):
+        yield
+
+
 def test_clean_scada_uses_current_project_metadata(monkeypatch):
     """Fengyang data must not be classified with the global tjwater metadata."""
 
@@ -51,7 +58,7 @@ def test_clean_scada_uses_current_project_metadata(monkeypatch):
 
     result = asyncio.run(
         composite_queries.CompositeQueries.clean_scada_data(
-            object(),
+            _FakeTimescaleConnection(),
             object(),
             ["fengyang-pressure-1"],
             datetime(2026, 6, 1, tzinfo=timezone.utc),
@@ -79,8 +86,8 @@ def test_clean_scada_rejects_devices_missing_from_project_metadata(monkeypatch):
     with pytest.raises(ValueError, match="缺少元数据"):
         asyncio.run(
             composite_queries.CompositeQueries.clean_scada_data(
-                object(),
-                object(),
+                _FakeTimescaleConnection(),
+                _FakeTimescaleConnection(),
                 ["fengyang-pressure-1"],
                 datetime(2026, 6, 1, tzinfo=timezone.utc),
                 datetime(2026, 6, 2, tzinfo=timezone.utc),
@@ -126,7 +133,7 @@ def test_clean_scada_rejects_zero_database_updates(monkeypatch):
     with pytest.raises(ValueError, match="未产生任何数据库更新"):
         asyncio.run(
             composite_queries.CompositeQueries.clean_scada_data(
-                object(),
+                _FakeTimescaleConnection(),
                 object(),
                 ["fengyang-pressure-1"],
                 datetime(2026, 6, 1, tzinfo=timezone.utc),
@@ -170,7 +177,7 @@ def test_clean_scada_propagates_write_failures(monkeypatch):
     with pytest.raises(RuntimeError, match="database write failed"):
         asyncio.run(
             composite_queries.CompositeQueries.clean_scada_data(
-                object(),
+                _FakeTimescaleConnection(),
                 object(),
                 ["fengyang-pressure-1"],
                 datetime(2026, 6, 1, tzinfo=timezone.utc),