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backend/app/api/export.py

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+"""Export API: Excel and PDF report download."""
+
+from io import BytesIO
+from fastapi import APIRouter, Depends, HTTPException
+from fastapi.responses import StreamingResponse
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.models.database import get_db
+from app.models import Case, Transaction
+from app.schemas import TransactionResponse
+
+router = APIRouter()
+
+
+@router.get("/{case_id}/export/excel")
+async def export_excel(case_id: int, db: AsyncSession = Depends(get_db)):
+    from app.services.report import build_excel_report
+    r = await db.execute(select(Case).where(Case.id == case_id))
+    case = r.scalar_one_or_none()
+    if not case:
+        raise HTTPException(status_code=404, detail="Case not found")
+    r = await db.execute(select(Transaction).where(Transaction.case_id == case_id).order_by(Transaction.transaction_time))
+    txns = [TransactionResponse.model_validate(t) for t in r.scalars().all()]
+    data = await build_excel_report(case, txns)
+    return StreamingResponse(
+        BytesIO(data),
+        media_type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+        headers={"Content-Disposition": f"attachment; filename=case_{case_id}_report.xlsx"},
+    )
+
+
+@router.get("/{case_id}/export/pdf")
+async def export_pdf(case_id: int, db: AsyncSession = Depends(get_db)):
+    from app.services.report import build_pdf_report
+    r = await db.execute(select(Case).where(Case.id == case_id))
+    case = r.scalar_one_or_none()
+    if not case:
+        raise HTTPException(status_code=404, detail="Case not found")
+    r = await db.execute(select(Transaction).where(Transaction.case_id == case_id).order_by(Transaction.transaction_time))
+    txns = [TransactionResponse.model_validate(t) for t in r.scalars().all()]
+    data = await build_pdf_report(case, txns)
+    return StreamingResponse(
+        BytesIO(data),
+        media_type="application/pdf",
+        headers={"Content-Disposition": f"attachment; filename=case_{case_id}_report.pdf"},
+    )