Prefer current orthophoto source version

backend/tests/test_sprint221_source_freshness_audit.py

@@ -133,6 +133,30 @@ def test_source_freshness_requires_dataset_version_and_marks_temporal_series() -
     assert item.integrity.missing_version_count == 1
 
 
+def test_rolling_orthophoto_prefers_explicit_current_snapshot_over_historical_observation() -> None:
+    current = _dataset(
+        "digitaal_vlaanderen_orthophoto",
+        imported_at=NOW - timedelta(days=2),
+        observed_at=None,
+        source_version="most_recent_at_2026-07-14",
+    )
+    historical = _dataset(
+        "digitaal_vlaanderen_orthophoto",
+        imported_at=NOW - timedelta(days=1),
+        observed_at=datetime(2020, 6, 1, tzinfo=timezone.utc),
+        source_version="2020",
+    )
+
+    report = SourceFreshnessService.build_report(
+        current.project_id,
+        [current, historical],
+        [_version(current), _version(historical)],
+        now=NOW,
+    )
+
+    assert report.items[0].latest_source_version == "most_recent_at_2026-07-14"
+
+
 def test_source_freshness_route_returns_canonical_envelope(monkeypatch) -> None:
     from app.api.routes import datasets as dataset_routes