Merge pull request #491 from ggozad/fix/image-embeddings-limit

Filter picture chunks at ingest and pool embedding/reranking HTTP clients

CHANGELOG.md

@@ -1,6 +1,15 @@
 # Changelog
 ## [Unreleased]
 
+### Changed
+
+- Duplicate images within a document produce a single picture chunk.
+- Pictures smaller than `processing.min_picture_size` pixels on the smaller side (default 64) no longer become picture chunks; `0` disables the filter.
+
+### Fixed
+
+- vLLM embedding and vLLM/Jina reranking reuse one HTTP client across requests instead of opening one per request.
+
 ## [0.64.0] - 2026-07-08
 
 ### Added

docs/configuration/processing.md

@@ -259,6 +259,8 @@ Per-image failures (404, timeout, oversized, unreadable) leave that picture as a
 | `description` | on | yes | yes |
 | `image` (default) | on | yes | no |
 
+Not every picture becomes a picture chunk. Identical picture bytes within a document produce a single chunk, so a watermark or logo repeated on every page embeds once. Pictures smaller than `processing.min_picture_size` pixels on their smaller side (default 64, `0` disables) are skipped entirely. Filtered pictures keep their bytes in `document_items`, so context expansion and vision QA still see them.
+
 Use `none` when you don't need picture content (e.g. very large reference manuals where RAM is tight). Use `description` to weave VLM-generated text into chunk content and keep bytes for later. Use `image` (default) to keep bytes without paying the VLM cost. The prompt is configurable under `prompts.picture_description`. See [Prompts](prompts.md).
 
 ```yaml
@@ -302,9 +304,9 @@ The Embedder column below is driven by `embeddings.model.multimodal`, not the pr
 |---|---|---|---|
 | `none` | any | text only (caption/surrounding) | none |
 | `image` | text-only | text only (caption/surrounding) | none |
-| `image` | multimodal | text only | one per picture, vector = image embedding |
+| `image` | multimodal | text only | one per distinct picture, vector = image embedding |
 | `description` | text-only | text + descriptions | none |
-| `description` | multimodal | text + descriptions | one per picture, vector = image embedding |
+| `description` | multimodal | text + descriptions | one per distinct picture, vector = image embedding |
 
 **What QA receives** at search time:
 

haiku_rag_slim/haiku/rag/client/__init__.py

@@ -143,6 +143,16 @@ class HaikuRAG:
     async def __aexit__(self, exc_type, exc_val, exc_tb):  # noqa: ARG002
         """Async context manager exit."""
         await self._await_vacuum_tasks()
+        # Best-effort: __aexit__ may run during exception unwinding, and a
+        # raising close must not mask the original exception. The reranker is
+        # a cached_property — close it only if it was materialized.
+        try:
+            await self.embedder.aclose()
+            reranker = self.__dict__.get("reranker")
+            if reranker is not None:
+                await reranker.aclose()
+        except Exception:
+            logger.debug("Closing embedder/reranker failed on teardown", exc_info=True)
         self.close()
         return False
 

haiku_rag_slim/haiku/rag/client/processing.py

@@ -1,4 +1,5 @@
 import asyncio
+import io
 import logging
 import tempfile
 from pathlib import Path
@@ -14,7 +15,7 @@ from haiku.rag.store.models.chunk import Chunk
 from haiku.rag.store.models.document_item import _picture_description_text
 
 if TYPE_CHECKING:
-    from docling_core.types.doc.document import DoclingDocument
+    from docling_core.types.doc.document import DoclingDocument, PictureItem
 
     from haiku.rag.embeddings import EmbedderWrapper
 
@@ -173,11 +174,13 @@ def _merge_picture_chunks(
     text_chunks: list[Chunk],
     document_id: str | None,
     existing_picture_data: dict[str, bytes] | None,
+    min_picture_size: int,
 ) -> list[Chunk]:
     picture_chunks = build_picture_chunks(
         docling_document,
         document_id=document_id,
         existing_picture_data=existing_picture_data,
+        min_picture_size=min_picture_size,
     )
 
     if not picture_chunks:
@@ -235,22 +238,49 @@ async def chunk(
         text_chunks,
         document_id,
         existing_picture_data,
+        config.processing.min_picture_size,
     )
 
 
+def _min_picture_side(picture: "PictureItem", data: bytes) -> float | None:
+    """The picture's smaller pixel dimension, or None when it can't be
+    determined. Uses ``ImageRef.size`` when the live image is present; falls
+    back to a PIL header read of the bytes (rebuild path, where picture URIs
+    have been stripped)."""
+    if picture.image is not None:
+        return min(picture.image.size.width, picture.image.size.height)
+
+    from PIL import Image as PILImage
+    from PIL import UnidentifiedImageError
+
+    try:
+        with PILImage.open(io.BytesIO(data)) as img:
+            return min(img.size)
+    except UnidentifiedImageError:
+        return None
+
+
 def build_picture_chunks(
     docling_document: "DoclingDocument",
     *,
     document_id: str | None = None,
     existing_picture_data: dict[str, bytes] | None = None,
+    min_picture_size: int = 0,
 ) -> list[Chunk]:
-    """Emit one synthetic ``Chunk`` per ``PictureItem`` with available bytes.
+    """Emit one synthetic ``Chunk`` per distinct ``PictureItem`` with available
+    bytes.
 
     Bytes come from ``picture.image.uri`` (live data URI on a freshly-converted
     docling) or from ``existing_picture_data`` keyed by ``self_ref`` (snapshot
     taken before a delete-and-re-extract cycle, when the live docling has had
     its picture URIs stripped). Pictures with no available bytes are skipped.
 
+    Pictures whose bytes were already seen in this document are skipped — the
+    first occurrence carries the chunk, so a watermark repeated on every page
+    embeds once. Pictures whose smaller side is under ``min_picture_size``
+    pixels are skipped entirely (``0`` disables the size filter; pictures
+    whose size can't be determined are kept).
+
     The bytes ride on ``Chunk._picture_data`` (a PrivateAttr — not serialized)
     so ``embed_chunks`` can route them through ``embed_image``. The
     ``order`` field is left at its default (0); the caller (``chunk()``)
@@ -262,6 +292,7 @@ def build_picture_chunks(
     )
 
     existing = existing_picture_data or {}
+    seen: set[bytes] = set()
     chunks: list[Chunk] = []
 
     for picture in docling_document.pictures:
@@ -271,6 +302,15 @@ def build_picture_chunks(
         if picture_data is None:
             continue
 
+        if picture_data in seen:
+            continue
+        seen.add(picture_data)
+
+        if min_picture_size > 0:
+            side = _min_picture_side(picture, picture_data)
+            if side is not None and side < min_picture_size:
+                continue
+
         text = extract_item_text(picture, docling_document) or ""
 
         page_numbers: list[int] = []

haiku_rag_slim/haiku/rag/config/models.py

@@ -206,6 +206,11 @@ class ProcessingConfig(BaseModel):
     - ``"image"``: docling generates picture images and stores them in
       ``document_items.picture_data``; no VLM runs at ingest.
     """
+    min_picture_size: int = 64
+    """Minimum pixel size (smaller side) for a picture to become a picture
+    chunk. Smaller pictures — icons, bullets, decorative graphics — are not
+    embedded or indexed; their bytes stay in ``document_items`` for context
+    expansion. ``0`` keeps all pictures."""
     extract_pdf_attachments: bool = True
     """When a PDF carries `/EmbeddedFiles`, ingest each attachment as a separate
     Document linked back to the wrapper via ``metadata.parent_uri``. Cap depth

haiku_rag_slim/haiku/rag/embeddings/__init__.py

@@ -73,6 +73,10 @@ class EmbedderWrapper:
             "embeddings.model.multimodal: true on a vllm, voyageai, or cohere model."
         )
 
+    async def aclose(self) -> None:
+        """Release resources held by the embedder. No-op by default;
+        embedders that own an HTTP client override this."""
+
 
 def _to_data_uri(image: "bytes | PILImage.Image") -> str:
     """Render an image as a ``data:image/png;base64,...`` URI."""

haiku_rag_slim/haiku/rag/embeddings/vllm.py

@@ -38,6 +38,10 @@ class VLLMMultimodalEmbedder(EmbedderWrapper):
         self._base_url = base_url.rstrip("/")
         self._api_key = api_key
         self._timeout = timeout
+        # One client reused across every request so the connection (and its
+        # name resolution) is established once and kept alive, rather than
+        # rebuilt per call.
+        self._client = httpx.AsyncClient(timeout=timeout)
 
     def _headers(self) -> dict[str, str]:
         headers = {"Content-Type": "application/json"}
@@ -45,16 +49,18 @@ class VLLMMultimodalEmbedder(EmbedderWrapper):
             headers["Authorization"] = f"Bearer {self._api_key}"
         return headers
 
+    async def aclose(self) -> None:
+        await self._client.aclose()
+
     async def _post(self, body: dict[str, Any]) -> list[list[float]]:
         try:
-            async with httpx.AsyncClient(timeout=self._timeout) as client:
+            response = await self._client.post(
-                response = await client.post(
+                f"{self._base_url}/embeddings",
-                    f"{self._base_url}/embeddings",
+                json=body,
-                    json=body,
+                headers=self._headers(),
-                    headers=self._headers(),
+            )
-                )
+            response.raise_for_status()
-                response.raise_for_status()
+            payload = response.json()
-                payload = response.json()
         except httpx.ConnectError as e:
             raise ValueError(
                 f"Could not connect to vLLM at {self._base_url}. "

haiku_rag_slim/haiku/rag/reranking/base.py

@@ -18,3 +18,7 @@ class RerankerBase:
         raise NotImplementedError(
             "Reranker is an abstract class. Please implement the _rerank method in a subclass."
         )
+
+    async def aclose(self) -> None:
+        """Release resources held by the reranker. No-op by default;
+        rerankers that own an HTTP client override this."""

haiku_rag_slim/haiku/rag/reranking/jina.py

@@ -14,34 +14,38 @@ class JinaReranker(RerankerBase):
         self._api_key = os.environ.get("JINA_API_KEY")
         if not self._api_key:
             raise ValueError("JINA_API_KEY environment variable required")
+        # One client reused across rerank calls (connection kept alive).
+        self._client = httpx.AsyncClient()
+
+    async def aclose(self) -> None:
+        await self._client.aclose()
 
     async def _rerank(
         self, query: str, chunks: list[Chunk], top_n: int = 10
     ) -> list[tuple[Chunk, float]]:
         documents = [chunk.content for chunk in chunks]
 
-        async with httpx.AsyncClient() as client:
+        response = await self._client.post(
-            response = await client.post(
+            "https://api.jina.ai/v1/rerank",
-                "https://api.jina.ai/v1/rerank",
+            json={
-                json={
+                "model": self._model,
-                    "model": self._model,
+                "query": query,
-                    "query": query,
+                "documents": documents,
-                    "documents": documents,
+                "top_n": top_n,
-                    "top_n": top_n,
+            },
-                },
+            headers={
-                headers={
+                "Authorization": f"Bearer {self._api_key}",
-                    "Authorization": f"Bearer {self._api_key}",
+                "Content-Type": "application/json",
-                    "Content-Type": "application/json",
+            },
-                },
+        )
-            )
+        response.raise_for_status()
-            response.raise_for_status()
 
-            result = response.json()
+        result = response.json()
 
-            scored_chunks = []
+        scored_chunks = []
-            for item in result.get("results", []):
+        for item in result.get("results", []):
-                index = item["index"]
+            index = item["index"]
-                score = item["relevance_score"]
+            score = item["relevance_score"]
-                scored_chunks.append((chunks[index], score))
+            scored_chunks.append((chunks[index], score))
 
-            return scored_chunks
+        return scored_chunks

haiku_rag_slim/haiku/rag/reranking/vllm.py

@@ -4,10 +4,15 @@ from haiku.rag.reranking.base import RerankerBase
 from haiku.rag.store.models.chunk import Chunk
 
 
-class VLLMReranker(RerankerBase):  # pragma: no cover
+class VLLMReranker(RerankerBase):
     def __init__(self, model: str, base_url: str):
         self._model = model
         self._base_url = base_url
+        # One client reused across rerank calls (connection kept alive).
+        self._client = httpx.AsyncClient()
+
+    async def aclose(self) -> None:
+        await self._client.aclose()
 
     async def _rerank(
         self, query: str, chunks: list[Chunk], top_n: int = 10
@@ -15,26 +20,25 @@ class VLLMReranker(RerankerBase):  # pragma: no cover
         # Prepare documents for reranking
         documents = [chunk.content for chunk in chunks]
 
-        async with httpx.AsyncClient() as client:
+        response = await self._client.post(
-            response = await client.post(
+            f"{self._base_url}/v1/rerank",
-                f"{self._base_url}/v1/rerank",
+            json={"model": self._model, "query": query, "documents": documents},
-                json={"model": self._model, "query": query, "documents": documents},
+            headers={
-                headers={
+                "accept": "application/json",
-                    "accept": "application/json",
+                "Content-Type": "application/json",
-                    "Content-Type": "application/json",
+            },
-                },
+        )
-            )
+        response.raise_for_status()
-            response.raise_for_status()
 
-            result = response.json()
+        result = response.json()
 
-            # Extract scores and pair with chunks
+        # Extract scores and pair with chunks
-            scored_chunks = []
+        scored_chunks = []
-            for item in result.get("results", []):
+        for item in result.get("results", []):
-                index = item["index"]
+            index = item["index"]
-                score = item["relevance_score"]
+            score = item["relevance_score"]
-                scored_chunks.append((chunks[index], score))
+            scored_chunks.append((chunks[index], score))
 
-            # Sort by score (descending) and return top_n
+        # Sort by score (descending) and return top_n
-            scored_chunks.sort(key=lambda x: x[1], reverse=True)
+        scored_chunks.sort(key=lambda x: x[1], reverse=True)
-            return scored_chunks[:top_n]
+        return scored_chunks[:top_n]

tests/test_embedder.py

@@ -154,6 +154,29 @@ async def test_client_embedder_is_store_embedder(temp_db_path):
         assert client.embedder is client.store.embedder
 
 
+async def test_client_aexit_closes_embedder(temp_db_path, monkeypatch):
+    """__aexit__ releases the embedder's HTTP resources. A never-accessed
+    reranker is not materialized just to be closed; an accessed-but-None
+    reranker (reranking disabled) is handled."""
+    from haiku.rag.client import HaikuRAG
+
+    closed = []
+
+    async def _record():
+        closed.append(True)
+
+    async with HaikuRAG(temp_db_path, create=True) as client:
+        monkeypatch.setattr(client.embedder, "aclose", _record)
+        assert client.reranker is None  # default config: reranking disabled
+
+    assert closed == [True]
+
+    async with HaikuRAG(temp_db_path) as client:
+        monkeypatch.setattr(client.embedder, "aclose", _record)
+
+    assert "reranker" not in client.__dict__
+
+
 @pytest.mark.vcr()
 async def test_embed_chunks_basic(allow_model_requests):
     """Test that embed_chunks generates embeddings for chunks."""
@@ -408,6 +431,44 @@ async def test_vllm_embed_image_request_shape(monkeypatch):
     assert url.startswith("data:image/png;base64,")
 
 
+async def test_vllm_reuses_pooled_client(monkeypatch):
+    """The embedder builds one httpx client and reuses it across requests
+    instead of opening a fresh connection per call; aclose releases it."""
+    from haiku.rag.embeddings.vllm import VLLMMultimodalEmbedder
+
+    stats = {"constructed": 0, "closed": 0}
+
+    class FakeResponse:
+        def raise_for_status(self):
+            pass
+
+        def json(self):
+            return {"data": [{"embedding": [0.1, 0.2]}]}
+
+    class FakeAsyncClient:
+        def __init__(self, *args, **kwargs):
+            stats["constructed"] += 1
+
+        async def post(self, url, json, headers):
+            return FakeResponse()
+
+        async def aclose(self):
+            stats["closed"] += 1
+
+    monkeypatch.setattr("httpx.AsyncClient", FakeAsyncClient)
+
+    embedder = VLLMMultimodalEmbedder(
+        model_name="x", vector_dim=2, base_url="http://localhost:8000/v1"
+    )
+    await embedder.embed_query("one")
+    await embedder.embed_query("two")
+    await embedder.embed_documents(["three", "four"])
+
+    assert stats["constructed"] == 1
+    await embedder.aclose()
+    assert stats["closed"] == 1
+
+
 async def test_vllm_supports_images_flag():
     from haiku.rag.embeddings.vllm import VLLMMultimodalEmbedder
 

tests/test_picture_in_context.py

@@ -281,6 +281,8 @@ async def test_embed_only_preserves_picture_vectors(temp_db_path, monkeypatch):
             model=EmbeddingModelConfig(provider="ollama", name="stub", vector_dim=4)
         )
     )
+    # The fixture picture is 8x8; disable the size filter so it still chunks.
+    config.processing.min_picture_size = 0
 
     docling_doc = _docling_doc_with_picture()
 
@@ -514,6 +516,124 @@ def test_build_picture_chunks_skips_pictures_without_bytes():
     assert chunks == []
 
 
+def _doc_with_picture_images(*images):
+    """DoclingDocument with one paragraph and one PictureItem per PIL image."""
+    from docling_core.types.doc.document import DoclingDocument, ImageRef
+    from docling_core.types.doc.labels import DocItemLabel
+
+    doc = DoclingDocument(name="pics")
+    doc.add_text(label=DocItemLabel.PARAGRAPH, text="Hello world")
+    for img in images:
+        doc.add_picture(image=ImageRef.from_pil(img, dpi=72))
+    return doc
+
+
+def test_build_picture_chunks_dedupes_identical_bytes():
+    """Identical picture bytes within a document produce one chunk — the
+    first occurrence. A watermark repeated on every page embeds once."""
+    from PIL import Image as PILImageModule
+
+    from haiku.rag.client.processing import build_picture_chunks
+
+    red = PILImageModule.new("RGB", (100, 100), "red")
+    blue = PILImageModule.new("RGB", (100, 100), "blue")
+    doc = _doc_with_picture_images(red, red, blue, red)
+
+    chunks = build_picture_chunks(doc, document_id="doc-1")
+
+    refs = [c.metadata["doc_item_refs"][0] for c in chunks]
+    assert refs == ["#/pictures/0", "#/pictures/2"]
+
+
+def test_build_picture_chunks_skips_small_pictures():
+    """Pictures whose smaller side is under min_picture_size are not chunked."""
+    from PIL import Image as PILImageModule
+
+    from haiku.rag.client.processing import build_picture_chunks
+
+    icon = PILImageModule.new("RGB", (16, 16), "red")
+    figure = PILImageModule.new("RGB", (100, 100), "blue")
+    banner = PILImageModule.new("RGB", (200, 16), "green")
+    doc = _doc_with_picture_images(icon, figure, banner)
+
+    chunks = build_picture_chunks(doc, document_id="doc-1", min_picture_size=64)
+
+    assert [c.metadata["doc_item_refs"][0] for c in chunks] == ["#/pictures/1"]
+
+
+def test_build_picture_chunks_measures_snapshot_bytes():
+    """Rebuild path: picture.image is None, so size comes from a PIL header
+    read of the snapshot bytes — existing DBs shed small pictures on rebuild."""
+    import io
+
+    from PIL import Image as PILImageModule
+
+    from haiku.rag.client.processing import build_picture_chunks
+
+    icon_png = io.BytesIO()
+    PILImageModule.new("RGB", (16, 16), "red").save(icon_png, format="PNG")
+    doc = _doc_with_picture_images(PILImageModule.new("RGB", (16, 16), "red"))
+    for picture in doc.pictures:
+        picture.image = None
+
+    chunks = build_picture_chunks(
+        doc,
+        document_id="doc-1",
+        existing_picture_data={"#/pictures/0": icon_png.getvalue()},
+        min_picture_size=64,
+    )
+    assert chunks == []
+
+
+def test_build_picture_chunks_keeps_unmeasurable_bytes():
+    """Bytes PIL can't parse are kept — the filter only drops what it can
+    measure."""
+    from haiku.rag.client.processing import build_picture_chunks
+    from tests.store.test_document_items import _docling_doc_with_picture
+
+    doc = _docling_doc_with_picture()
+    for picture in doc.pictures:
+        picture.image = None
+
+    chunks = build_picture_chunks(
+        doc,
+        document_id="doc-1",
+        existing_picture_data={"#/pictures/0": b"not-an-image"},
+        min_picture_size=64,
+    )
+    assert len(chunks) == 1
+
+
+@pytest.mark.asyncio
+async def test_chunk_filters_small_pictures_by_config(monkeypatch):
+    """``chunk()`` applies ``processing.min_picture_size`` — with the default
+    config, icon-sized pictures don't become picture chunks."""
+    from haiku.rag.client.processing import chunk
+    from haiku.rag.embeddings import EmbedderWrapper
+    from haiku.rag.store.models.chunk import Chunk
+    from tests.store.test_document_items import _docling_doc_with_picture
+
+    class StubMultimodalEmbedder(EmbedderWrapper):
+        supports_images = True
+
+        def __init__(self):
+            super().__init__(embedder=None, vector_dim=4)
+
+    class StubChunker:
+        async def chunk(self, document):
+            return [Chunk(content="text", metadata={"doc_item_refs": ["#/texts/0"]})]
+
+    monkeypatch.setattr(
+        "haiku.rag.chunkers.get_chunker", lambda *a, **kw: StubChunker()
+    )
+
+    doc = _docling_doc_with_picture()  # 8x8 picture, below the 64px default
+    chunks = await chunk(AppConfig(), doc, embedder=StubMultimodalEmbedder())
+
+    assert [c.content for c in chunks] == ["text"]
+    assert not any("picture" in (c.metadata or {}).get("labels", []) for c in chunks)
+
+
 @pytest.mark.asyncio
 async def test_chunk_interleaves_picture_in_structural_order(monkeypatch):
     """``chunk()`` merges text and picture chunks by their first
@@ -554,7 +674,7 @@ async def test_chunk_interleaves_picture_in_structural_order(monkeypatch):
     from docling_core.types.doc.labels import DocItemLabel
     from PIL import Image as PILImageModule
 
-    img = PILImageModule.new("RGB", (8, 8), "blue")
+    img = PILImageModule.new("RGB", (64, 64), "blue")
     doc = DoclingDocument(name="ordered")
     doc.add_text(label=DocItemLabel.PARAGRAPH, text="A")
     doc.add_text(label=DocItemLabel.PARAGRAPH, text="B")
@@ -676,6 +796,8 @@ async def test_ingest_emits_picture_chunks_with_multimodal_embedder(
             model=EmbeddingModelConfig(provider="ollama", name="stub", vector_dim=4)
         )
     )
+    # The fixture picture is 8x8; disable the size filter so it still chunks.
+    config.processing.min_picture_size = 0
 
     async with HaikuRAG(temp_db_path, config=config, create=True) as rag:
         chunks = await rag.chunk(docling_doc)

tests/test_processing.py

@@ -218,7 +218,7 @@ def test_merge_picture_chunks_no_pictures_returns_text_chunks():
     doc = _doc_without_pictures()
     text_chunks = [Chunk(content="a"), Chunk(content="b")]
 
-    result = _merge_picture_chunks(doc, text_chunks, None, None)
+    result = _merge_picture_chunks(doc, text_chunks, None, None, 0)
 
     assert result is text_chunks
     assert [c.order for c in result] == [0, 1]

tests/test_reranker.py

@@ -274,6 +274,84 @@ class TestGetReranker:
             assert getattr(result, attr) == value
 
 
+class _PoolStats:
+    """Fake httpx.AsyncClient factory counting constructions and closes."""
+
+    def __init__(self, response_json):
+        self.constructed = 0
+        self.closed = 0
+        stats = self
+
+        class FakeResponse:
+            def raise_for_status(self):
+                pass
+
+            def json(self):
+                return response_json
+
+        class FakeAsyncClient:
+            def __init__(self, *args, **kwargs):
+                stats.constructed += 1
+
+            async def post(self, url, json, headers):
+                return FakeResponse()
+
+            async def aclose(self):
+                stats.closed += 1
+
+        self.client_class = FakeAsyncClient
+
+
+@pytest.mark.asyncio
+async def test_vllm_reranker_reuses_pooled_client(monkeypatch):
+    """One httpx client is built and reused across rerank calls; aclose
+    releases it."""
+    from haiku.rag.reranking.vllm import VLLMReranker
+
+    stats = _PoolStats({"results": [{"index": 0, "relevance_score": 0.9}]})
+    monkeypatch.setattr("httpx.AsyncClient", stats.client_class)
+
+    reranker = VLLMReranker(model="m", base_url="http://localhost:8000")
+    docs = [Chunk(content="a", order=0)]
+    await reranker.rerank("q", docs)
+    await reranker.rerank("q", docs)
+
+    assert stats.constructed == 1
+    await reranker.aclose()
+    assert stats.closed == 1
+
+
+@pytest.mark.asyncio
+async def test_jina_reranker_reuses_pooled_client(monkeypatch):
+    """One httpx client is built and reused across rerank calls; aclose
+    releases it."""
+    monkeypatch.setenv("JINA_API_KEY", "test-api-key")
+    from haiku.rag.reranking.jina import JinaReranker
+
+    stats = _PoolStats({"results": [{"index": 0, "relevance_score": 0.9}]})
+    monkeypatch.setattr("httpx.AsyncClient", stats.client_class)
+
+    reranker = JinaReranker("jina-reranker-v3")
+    docs = [Chunk(content="a", order=0)]
+    await reranker.rerank("q", docs)
+    await reranker.rerank("q", docs)
+
+    assert stats.constructed == 1
+    await reranker.aclose()
+    assert stats.closed == 1
+
+
+@pytest.mark.asyncio
+async def test_reranker_base_aclose_is_noop():
+    """Base aclose exists so client teardown can close any reranker."""
+
+    class Custom(RerankerBase):
+        async def _rerank(self, query, chunks, top_n=10):
+            return []
+
+    await Custom().aclose()  # must not raise
+
+
 def test_jina_reranker_missing_api_key(monkeypatch):
     monkeypatch.delenv("JINA_API_KEY", raising=False)