fix(gps-tracks): aggregate last_pipeline_run in health endpoint (REQ-F-12)

Replace raw single-row fetch with aggregation over all pipeline_runs
rows sharing the latest started_at. Returns structured object with
regions[], sources_ok[], sources_error[], tracks_added instead of
a raw DB row with region_id/source_id strings.

Returns null when no runs exist (empty DB).

Update test_i40_health_endpoint: add db_with_pipeline_runs fixture
(two rows, same started_at, two regions) and assert the full
aggregated shape including concrete values.

Refs: ET-008
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/api/test_gps_tracks_endpoint.py

@@ -8,9 +8,7 @@ I-30: MVT тайл отдаётся
 I-31: cache hit
 I-40: health endpoint
 """
-import json
 import pytest
-import pytest_asyncio
 
 from httpx import AsyncClient, ASGITransport
 from fastapi import FastAPI
@@ -99,6 +97,52 @@ def db_with_tracks(tmp_path):
     yield db_path
 
 
+@pytest.fixture
+def db_with_pipeline_runs(db_with_tracks):
+    """БД с треками и записями о прогонах pipeline (REQ-F-12).
+
+    Один прогон охватывает два региона и один источник.
+    Имитирует ситуацию когда pipeline записал две строки
+    с одинаковым started_at (один запуск скрипта).
+    """
+    db_path = db_with_tracks
+    conn = open_db(db_path)
+
+    conn.executemany(
+        """
+        INSERT INTO pipeline_runs
+            (started_at, finished_at, region_id, source_id,
+             status, tracks_new, tracks_updated, errors_json)
+        VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+        """,
+        [
+            (
+                "2026-05-30T03:00:00Z",
+                "2026-05-30T04:00:00Z",
+                "cfo",
+                "osm",
+                "ok",
+                42,
+                5,
+                None,
+            ),
+            (
+                "2026-05-30T03:00:00Z",
+                "2026-05-30T05:14:00Z",
+                "chuvashia",
+                "osm",
+                "ok",
+                10,
+                2,
+                None,
+            ),
+        ],
+    )
+    conn.commit()
+    conn.close()
+    yield db_path
+
+
 # ─── I-20: GeoJSON с фильтрами ────────────────────────────────────────────────
 
 @pytest.mark.asyncio
@@ -304,9 +348,13 @@ async def test_i31_cache_hit(db_with_tracks):
 # ─── I-40: health endpoint ────────────────────────────────────────────────────
 
 @pytest.mark.asyncio
-async def test_i40_health_endpoint(db_with_tracks):
-    """I-40: health endpoint возвращает корректную статистику."""
-    app = _make_test_app(db_with_tracks)
+async def test_i40_health_endpoint(db_with_pipeline_runs):
+    """I-40: health endpoint возвращает корректную статистику.
+
+    REQ-F-12: last_pipeline_run — агрегированный объект, а не сырая строка БД.
+    Структура: started_at, finished_at, regions[], sources_ok[], sources_error[], tracks_added.
+    """
+    app = _make_test_app(db_with_pipeline_runs)
     async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
         resp = await client.get("/api/gps-tracks/health")
 
@@ -316,7 +364,37 @@ async def test_i40_health_endpoint(db_with_tracks):
     assert "tracks_total" in data
     assert data["tracks_total"] > 0
     assert "tracks_by_activity" in data
+
+    # REQ-F-12: агрегированный объект last_pipeline_run
     assert "last_pipeline_run" in data
+    run = data["last_pipeline_run"]
+    assert run is not None, "last_pipeline_run must not be None when pipeline_runs exist"
+
+    # Обязательные поля
+    assert "started_at" in run
+    assert "finished_at" in run
+    assert "regions" in run
+    assert "sources_ok" in run
+    assert "sources_error" in run
+    assert "tracks_added" in run
+
+    # Типы
+    assert isinstance(run["regions"], list)
+    assert isinstance(run["sources_ok"], list)
+    assert isinstance(run["sources_error"], list)
+    assert isinstance(run["tracks_added"], int)
+
+    # Нет сырых полей строки БД (region_id, source_id — не агрегированные)
+    assert "region_id" not in run, "raw DB field region_id must not be present"
+    assert "source_id" not in run, "raw DB field source_id must not be present"
+
+    # Конкретные агрегированные значения из fixture (2 строки одного прогона)
+    assert run["started_at"] == "2026-05-30T03:00:00Z"
+    assert run["finished_at"] == "2026-05-30T05:14:00Z"   # max из двух строк
+    assert set(run["regions"]) == {"cfo", "chuvashia"}
+    assert "osm" in run["sources_ok"]
+    assert run["sources_error"] == []
+    assert run["tracks_added"] == 52  # 42 + 10
 
 
 @pytest.mark.asyncio