Backend: alle Chargen auflisten + Lagerort mehrerer Chargen auf einmal setzen

GET /lots/rows liefert alle Chargen mit Artikel-Infos (Name, Menge, Einheit,
Lagerort) fuer eine uebergreifende Chargenliste. POST /lots/bulk-location setzt
den Lagerort vieler Chargen in einem Rutsch (reine Ortsangabe, ohne Bewegung).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/app/routers/stock.py

@@ -1,24 +1,26 @@
 from fastapi import APIRouter, Depends, HTTPException, status
-from sqlalchemy.orm import Session
+from sqlalchemy.orm import Session, joinedload
 
 from ..crud import product_tracking, resolve_product
 from ..database import get_db
 from ..deps import get_current_user
-from ..models import CategoryTracking, Lot, Movement, MovementType, User
+from ..models import CategoryTracking, Location, Lot, Movement, MovementType, User
 from ..schemas import (
     BatchCheckInRequest,
     BatchCheckInResponse,
+    BulkLotLocation,
     CheckInRequest,
     CheckInResponse,
     CheckOutRequest,
     CheckOutResponse,
     LotOut,
+    LotRow,
     LotUpdate,
     RelocateRequest,
     RemoveRequest,
     StockActionResponse,
 )
-from ..services.conversion import ConversionError
+from ..services.conversion import ConversionError, display_unit_info
 from ..services.dates import clean_precision, normalize_best_before
 from ..services.stock import (
     StockError,
@@ -236,6 +238,55 @@ def list_lots(
     return query.order_by(Lot.best_before.is_(None), Lot.best_before).all()
 
 
+@router.get("/lots/rows", response_model=list[LotRow])
+def list_all_lots(
+    db: Session = Depends(get_db),
+    _: User = Depends(get_current_user),
+) -> list[LotRow]:
+    """Alle Chargen über alle Artikel – für die übergreifende Chargenliste mit
+    Artikelname, Menge und Lagerort. Der Artikel wird eager geladen (kein N+1)."""
+    lots = (
+        db.query(Lot)
+        .options(joinedload(Lot.product))
+        .order_by(Lot.created_at.desc())
+        .all()
+    )
+    rows: list[LotRow] = []
+    for lot in lots:
+        p = lot.product
+        name, factor = display_unit_info(p)
+        rows.append(LotRow(
+            id=lot.id, product_id=p.id, product_name=p.name, product_brand=p.brand,
+            quantity=lot.quantity, base_unit=p.base_unit,
+            package_size=p.package_size, package_label=p.package_label,
+            unit_name=name, unit_factor=factor,
+            best_before=lot.best_before, best_before_precision=lot.best_before_precision,
+            location_id=lot.location_id, created_at=lot.created_at,
+        ))
+    return rows
+
+
+@router.post("/lots/bulk-location", response_model=int)
+def bulk_lot_location(
+    payload: BulkLotLocation,
+    db: Session = Depends(get_db),
+    _: User = Depends(get_current_user),
+) -> int:
+    """Lagerort mehrerer Chargen auf einmal setzen (oder mit null leeren). Reine
+    Ortsangabe – kein Umbuchen mit Bewegung. Gibt die Anzahl geänderter Zeilen."""
+    if not payload.lot_ids:
+        return 0
+    if payload.location_id is not None and db.get(Location, payload.location_id) is None:
+        raise HTTPException(status.HTTP_404_NOT_FOUND, "Lagerort nicht gefunden")
+    n = (
+        db.query(Lot)
+        .filter(Lot.id.in_(payload.lot_ids))
+        .update({Lot.location_id: payload.location_id}, synchronize_session=False)
+    )
+    db.commit()
+    return n
+
+
 @router.patch("/lots/{lot_id}", response_model=LotOut)
 def update_lot(
     lot_id: int,