Persist map selections as derived datasets

backend/app/api/routes/datasets.py

@@ -25,6 +25,7 @@ from app.schemas import (
     VectorClipRequest,
     VectorIntersectRequest,
     VectorSelectionBBox,
+    VectorSelectionDeriveRequest,
     VectorSelectionRequest,
     VectorSelectionResponse,
 )
@@ -205,6 +206,28 @@ def select_vector_features(
     return envelope(VectorSelectionResponse(**result).model_dump())
 
 
+@router.post("/datasets/{dataset_id}/vector/select/derive", status_code=201, response_model=dict)
+def derive_vector_selection_dataset(
+    project_id: UUID,
+    dataset_id: UUID,
+    payload: VectorSelectionDeriveRequest,
+    db: Session = Depends(get_db),
+):
+    dataset = DatasetService.get_dataset(db, dataset_id)
+    if dataset.project_id != project_id:
+        raise HTTPException(status_code=404, detail="Dataset not found")
+    if dataset.dataset_type not in {"vector", "geojson"}:
+        raise AppError(code="DATASET_NOT_VECTOR", message="Area selection requires a vector dataset", status_code=400)
+    derived = VectorOperationsService.derive_selection_dataset(
+        db=db,
+        dataset_id=dataset_id,
+        bbox=payload.bbox.model_dump(),
+        limit=payload.limit,
+        output_name=payload.output_name,
+    )
+    return envelope(derived.model_dump())
+
+
 @router.post("/datasets/{dataset_id}/vector/clip", status_code=201, response_model=dict)
 def clip_vector_dataset(
     project_id: UUID,