fix: retain WALOUS edition warnings

backend/app/services/temporal_analysis_service.py

@@ -327,9 +327,10 @@ class TemporalAnalysisService:
         warnings = [
             "WALOUS-evolutie vergelijkt celgebaseerde landbedekkingsoppervlakten; individuele objectwijzigingen zijn niet beschikbaar.",
         ]
-        limitation = str(later_summary.get("warning") or earlier_summary.get("warning") or "").strip()
-        if limitation:
-            warnings.append(limitation)
+        for summary in (earlier_summary, later_summary):
+            limitation = str(summary.get("warning") or "").strip()
+            if limitation and limitation not in warnings:
+                warnings.append(limitation)
         return TemporalComparisonResponse(
             temporal_series_key=str(earlier.temporal_series_key),
             earlier=TemporalDatasetRef(
@@ -497,7 +498,6 @@ class TemporalAnalysisService:
         earlier_full_dataset_area: bool = False,
         later_full_dataset_area: bool = False,
     ) -> tuple[TemporalObjectChanges, dict[str, Any], list[str]]:
-        earlier_config = earlier.source_metadata if isinstance(earlier.source_metadata, dict) else {}
         later_config = later.source_metadata if isinstance(later.source_metadata, dict) else {}
         earlier_identity = TemporalAnalysisService._identity_contract(earlier)
         later_identity = TemporalAnalysisService._identity_contract(later)

backend/tests/test_walous_land_cover_service.py

@@ -499,7 +499,11 @@ def test_walous_temporal_comparison_reuses_persisted_raster_metrics(
                     }
                 ],
             },
-            "limitation_message": "Cell-based estimate.",
+            "limitation_message": (
+                "2018 crosswalk and methodology limitation."
+                if dataset_id == earlier.id
+                else "2023 edition accuracy limitation."
+            ),
         }
 
     monkeypatch.setattr(WalousLandCoverService, "analyze", analyze)
@@ -523,6 +527,8 @@ def test_walous_temporal_comparison_reuses_persisted_raster_metrics(
     assert result.metric.later_value == 5.5
     assert result.metric.absolute_change == 1.5
     assert result.object_changes.available is False
+    assert "2018 crosswalk and methodology limitation." in result.warnings
+    assert "2023 edition accuracy limitation." in result.warnings
 
 
 def test_walous_api_routes_use_canonical_envelopes(monkeypatch) -> None: