feat: export reproducible retrieval history snapshots

backend/app/api/routes/retrieval.py

@@ -1,12 +1,14 @@
 from uuid import UUID
 
 from fastapi import APIRouter, Depends, HTTPException, Query
+from fastapi.responses import Response
 from sqlalchemy import func, select
 from sqlalchemy.orm import Session
 
 from app.db.session import get_db
 from app.models import RetrievalRun
 from app.schemas.catalog import Page
+from app.schemas.exports import ExportHistory
 from app.schemas.hybrid import (
     ChunkKeywordRequest,
     ChunkKeywordResponse,
@@ -17,6 +19,7 @@ from app.schemas.retrieval import RetrievalRequest, RetrievalResponse
 from app.schemas.vectors import VectorRetrievalResponse
 from app.services.auth import require_admin
 from app.services.embedding_runtime import get_embedding_provider
+from app.services.exports import export_history
 from app.services.hybrid import retrieve_chunks, retrieve_hybrid
 from app.services.retrieval import retrieve
 
@@ -25,6 +28,26 @@ router = APIRouter(prefix="/retrieval", tags=["retrieval"])
 RunResponse = RetrievalResponse | VectorRetrievalResponse | ChunkKeywordResponse | HybridResponse
 
 
+@router.post(
+    "/exports",
+    response_class=Response,
+    responses={200: {"content": {"application/x-ndjson": {}}, "description": "JSONL 历史快照"}},
+    dependencies=[Depends(require_admin)],
+)
+def download_history(payload: ExportHistory, db: Session = Depends(get_db)):
+    """管理员按明确编号导出历史；沿用 Origin/CSRF，失败不返回部分文件。"""
+    content, export_id, digest = export_history(db, payload)
+    return Response(
+        content,
+        media_type="application/x-ndjson; charset=utf-8",
+        headers={
+            "Content-Disposition": f'attachment; filename="nalati-retrieval-{export_id}.jsonl"',
+            "X-Records-SHA256": digest,
+            "X-Content-Type-Options": "nosniff",
+        },
+    )
+
+
 @router.post("", response_model=RetrievalResponse)
 def keyword_retrieval(payload: RetrievalRequest, db: Session = Depends(get_db)):
     """只检索已核验知识；保存原始检索结果供复核，不调用大模型。"""