feat(estimates): integrate inventory items

ARCHITECTURE.md

@@ -221,7 +221,7 @@ Tabellen:
 
 ## Lager / Ersatzteile
 
-Das Modul `Lager / Ersatzteile` verwaltet Bauteile und Verbrauchsmaterial fuer Werkstattprozesse. Es ist in v0.8.7 als eigenstaendige Lagerbasis umgesetzt und fuer die spaetere Verknuepfung mit Reparaturen und Kostenvoranschlaegen vorbereitet.
+Das Modul `Lager / Ersatzteile` verwaltet Bauteile und Verbrauchsmaterial fuer Werkstattprozesse. Seit v0.8.8 ist es mit Kostenvoranschlaegen verbunden: Mitarbeiter koennen aktive Lagerartikel als KV-Position uebernehmen.
 
 Datenfluss:
 
@@ -238,6 +238,9 @@ Kernregeln:
 - `quantity_available` wird konsistent als `quantity_on_hand - quantity_reserved` gespeichert.
 - Bestandsaenderungen erfolgen ueber Bewegungen, nicht ueber freie Client-Manipulation.
 - Artikel mit Bewegungen werden bei Delete deaktiviert statt hart geloescht.
+- Lagerartikel in KV-Positionen werden ueber `inventory_item_id` verknuepft.
+- KV-Positionen speichern Snapshot-Felder fuer Name, SKU, Hersteller und Teilenummer, damit ein KV unveraendert bleibt, wenn der Lagerartikel spaeter geaendert wird.
+- Verkaufspreis, Einheit, Artikelname und SKU werden serverseitig aus dem Lager uebernommen. Manuelle Preisueberschreibung ist moeglich und wird auditiert.
 
 Tabellen:
 
@@ -271,7 +274,16 @@ RBAC-Permissions:
 
 Dashboard-Kennzahlen fuer Lagerdaten werden nur mit `inventory.read` ausgeliefert. Audit Logs und Activity Feed enthalten Artikel- und Bestandsaktionen, aber keine unnoetigen sensiblen Lieferantendaten.
 
-Die Integration von Lagerartikeln in Kostenvoranschlagspositionen folgt in v0.8.8. CSV-Import/Export und Barcode-/QR-Funktionen bleiben vorbereitete Folgefeatures.
+Reservierungslogik:
+
+- Entwurf: keine Reservierung.
+- Senden: verknuepfte Lagerartikel werden reserviert.
+- Freigabe: Reservierung bleibt bestehen.
+- Ablehnung: Reservierung wird freigegeben.
+- Storno: Reservierung wird freigegeben.
+- Loeschung eines gesendeten KV: Reservierung wird freigegeben.
+
+Automatischer Verbrauch beim Reparaturabschluss ist vorbereitet, wird aber noch nicht automatisch ausgefuehrt. CSV-Import/Export und Barcode-/QR-Funktionen bleiben vorbereitete Folgefeatures.
 
 Hermes-Endpunkte:
 

README-DEV.md

@@ -228,6 +228,7 @@ SECRET_KEY=local-check uv run alembic upgrade head
 Athena erreicht Lagerdaten ausschliesslich ueber BFF-Routen:
 
 - `/api/inventory/items`
+- `/api/inventory/items/search`
 - `/api/inventory/items/[id]`
 - `/api/inventory/items/[id]/stock/adjust`
 - `/api/inventory/items/[id]/stock/reserve`
@@ -251,10 +252,19 @@ Bestandslogik:
 - Artikel mit Bewegungen werden deaktiviert statt hart geloescht.
 - Preise werden intern in cents gespeichert; Athena akzeptiert deutsche Euro-Eingaben wie `1`, `1,50` und `1.50`.
 
+KV-Integration ab v0.8.8:
+
+- Lagerartikel koennen im KV-Dialog gesucht und als Position uebernommen werden.
+- Hermes uebernimmt Verkaufspreis, Einheit, Artikelname, SKU und Hersteller serverseitig.
+- `repair_estimate_items` speichert Snapshot-Felder, damit spaetere Lageraenderungen alte KVs nicht veraendern.
+- Nur gesendete KVs reservieren Bestand.
+- Ablehnung, Storno und Loeschung eines gesendeten KV geben Reservierungen frei.
+- Freigegebene KVs behalten die Reservierung.
+- Automatischer Verbrauch beim Reparaturabschluss ist vorbereitet, aber noch nicht aktiv.
+
 Folgefeatures:
 
-- Integration in Kostenvoranschlaege folgt in v0.8.8.
-- CSV-Template, Import/Export und Barcode-/QR-Funktionen bleiben vorbereitet, sind aber in v0.8.7 nicht aktiv.
+- CSV-Template, Import/Export und Barcode-/QR-Funktionen bleiben vorbereitet, sind aber in v0.8.8 nicht aktiv.
 
 Vorbereitete Website-/Portal-Routen fuer spaeter:
 

ROADMAP.md

@@ -162,12 +162,19 @@ Die Roadmap beschreibt die geplante fachliche Entwicklung von Olympus CRM. Archi
 - Vorbereitung fuer Kostenvoranschlagsintegration in v0.8.8
 - Keine Lexoffice-Anbindung, keine automatische Bestellung, keine Barcode-/QR-Funktion
 
-## v0.8.8 - Lagerintegration in Kostenvoranschläge, geplant
+## v0.8.8 - Lagerintegration in Kostenvoranschläge
 
 - Lagerartikel als KV-Position ueber Suche auswaehlen
 - Verkaufspreis aus `selling_price_cents` uebernehmen
-- Reservierungen aus KV-/Reparaturprozess vorbereiten
-- CSV-Template und Exportkonzept fuer Lagerdaten vorbereiten
+- Snapshot-Konzept fuer Name, SKU, Hersteller und Teilenummer in KV-Positionen
+- Reservierung beim Senden eines KV
+- Freigabe behaelt Reservierung
+- Ablehnung, Storno und Loeschung geben Reservierungen frei
+- Bestandsbewegungen mit `reference_type=repair_estimate`
+- Dashboard-Kennzahlen fuer reservierte Artikel, reservierten Warenwert und Mindestbestand
+- Audit-/Activity-Eintraege fuer Reservierung, Freigabe, Verbrauchsvorbereitung und manuelle Preisueberschreibung
+- Automatische Verbrauchsbuchung beim Reparaturabschluss vorbereitet, aber noch nicht aktiv
+- CSV-Template und Exportkonzept fuer Lagerdaten bleiben Folgefeatures
 
 ## v0.8.9 - Kundenportal, geplant
 

backend/hermes/alembic/versions/f4a9c2d7e118_extend_repair_estimate_items_inventory.py

@@ -0,0 +1,44 @@
+"""extend repair estimate items inventory
+
+Revision ID: f4a9c2d7e118
+Revises: ef8a2d5c9017
+Create Date: 2026-07-05 13:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = "f4a9c2d7e118"
+down_revision: Union[str, Sequence[str], None] = "ef8a2d5c9017"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column("repair_estimate_items", sa.Column("inventory_item_id", sa.Integer(), nullable=True))
+    op.add_column("repair_estimate_items", sa.Column("inventory_snapshot_name", sa.String(length=255), server_default="", nullable=False))
+    op.add_column("repair_estimate_items", sa.Column("inventory_snapshot_sku", sa.String(length=40), server_default="", nullable=False))
+    op.add_column("repair_estimate_items", sa.Column("inventory_snapshot_manufacturer", sa.String(length=180), nullable=True))
+    op.add_column("repair_estimate_items", sa.Column("inventory_snapshot_part_number", sa.String(length=180), nullable=True))
+    op.create_index(op.f("ix_repair_estimate_items_inventory_item_id"), "repair_estimate_items", ["inventory_item_id"], unique=False)
+    op.create_foreign_key(
+        "fk_repair_estimate_items_inventory_item_id",
+        "repair_estimate_items",
+        "inventory_items",
+        ["inventory_item_id"],
+        ["id"],
+        ondelete="SET NULL",
+    )
+
+
+def downgrade() -> None:
+    op.drop_constraint("fk_repair_estimate_items_inventory_item_id", "repair_estimate_items", type_="foreignkey")
+    op.drop_index(op.f("ix_repair_estimate_items_inventory_item_id"), table_name="repair_estimate_items")
+    op.drop_column("repair_estimate_items", "inventory_snapshot_part_number")
+    op.drop_column("repair_estimate_items", "inventory_snapshot_manufacturer")
+    op.drop_column("repair_estimate_items", "inventory_snapshot_sku")
+    op.drop_column("repair_estimate_items", "inventory_snapshot_name")
+    op.drop_column("repair_estimate_items", "inventory_item_id")

backend/hermes/app/api/dashboard.py

@@ -89,6 +89,9 @@ def get_dashboard_summary(
             MetricCard(label="Aktive Ersatzteile", value=InventoryRepository.count_active_items(db)),
             MetricCard(label="Niedriger Bestand", value=InventoryRepository.count_low_stock_items(db)),
             MetricCard(label="Lagerwert Einkauf", value=InventoryRepository.total_stock_value_cents(db)),
+            MetricCard(label="Reservierte Artikel", value=InventoryRepository.count_reserved_items(db)),
+            MetricCard(label="Reservierter Warenwert", value=InventoryRepository.reserved_stock_value_cents(db)),
+            MetricCard(label="Artikel unter Mindestbestand", value=InventoryRepository.count_low_stock_items(db)),
             MetricCard(label="Letzte Bewegungen", value=len(InventoryRepository.latest_movements(db, limit=5))),
         ]
 

backend/hermes/app/api/inventory.py

@@ -81,6 +81,18 @@ def list_items(
     return InventoryItemListResponse(items=items, total=total, limit=limit, offset=offset)
 
 
+@router.get("/items/search", response_model=list[InventoryItemResponse])
+def search_items(
+    q: str | None = None,
+    category: int | None = None,
+    manufacturer: str | None = None,
+    limit: int = Query(default=20, ge=1, le=50),
+    db: Session = Depends(get_db),
+    current_user: User = Depends(require_permission("inventory.read")),
+):
+    return InventoryRepository.search_items(db, q=q, category_id=category, manufacturer=manufacturer, limit=limit)
+
+
 @router.post("/items", response_model=InventoryItemResponse, status_code=status.HTTP_201_CREATED)
 def create_item(
     payload: InventoryItemCreate,

backend/hermes/app/models/repair_estimate.py

@@ -52,6 +52,11 @@ class RepairEstimateItem(Base):
 
     id: Mapped[int] = mapped_column(primary_key=True)
     estimate_id: Mapped[int] = mapped_column(ForeignKey("repair_estimates.id", ondelete="CASCADE"), index=True)
+    inventory_item_id: Mapped[int | None] = mapped_column(ForeignKey("inventory_items.id", ondelete="SET NULL"), nullable=True, index=True)
+    inventory_snapshot_name: Mapped[str] = mapped_column(String(255), default="", server_default="")
+    inventory_snapshot_sku: Mapped[str] = mapped_column(String(40), default="", server_default="")
+    inventory_snapshot_manufacturer: Mapped[str | None] = mapped_column(String(180), nullable=True)
+    inventory_snapshot_part_number: Mapped[str | None] = mapped_column(String(180), nullable=True)
     position: Mapped[int] = mapped_column(Integer)
     item_type: Mapped[str] = mapped_column(String(40), index=True)
     title: Mapped[str] = mapped_column(String(255))
@@ -64,6 +69,7 @@ class RepairEstimateItem(Base):
     updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
 
     estimate: Mapped[RepairEstimate] = relationship(back_populates="items")
+    inventory_item = relationship("InventoryItem", lazy="joined")
 
 
 class RepairEstimateEvent(Base):

backend/hermes/app/repositories/inventory_repository.py

@@ -69,6 +69,32 @@ class InventoryRepository:
         )
         return items, total
 
+    @staticmethod
+    def search_items(
+        db: Session,
+        *,
+        q: str | None = None,
+        category_id: int | None = None,
+        manufacturer: str | None = None,
+        limit: int = 20,
+    ) -> list[InventoryItem]:
+        query = InventoryRepository.item_query().where(InventoryItem.is_active.is_(True))
+        if q:
+            pattern = f"%{q.strip()}%"
+            query = query.where(or_(
+                InventoryItem.sku.ilike(pattern),
+                InventoryItem.name.ilike(pattern),
+                InventoryItem.manufacturer.ilike(pattern),
+                InventoryItem.manufacturer_part_number.ilike(pattern),
+                InventoryItem.supplier_part_number.ilike(pattern),
+                InventoryItem.compatible_devices.ilike(pattern),
+            ))
+        if category_id is not None:
+            query = query.where(InventoryItem.category_id == category_id)
+        if manufacturer:
+            query = query.where(InventoryItem.manufacturer.ilike(f"%{manufacturer.strip()}%"))
+        return list(db.scalars(query.order_by(InventoryItem.name.asc(), InventoryItem.id.asc()).limit(limit)))
+
     @staticmethod
     def get_item(db: Session, item_id: int) -> InventoryItem | None:
         return db.scalar(InventoryRepository.item_query().where(InventoryItem.id == item_id))
@@ -176,6 +202,22 @@ class InventoryRepository:
             .where(InventoryItem.purchase_price_cents.is_not(None))
         ) or 0
 
+    @staticmethod
+    def count_reserved_items(db: Session) -> int:
+        return db.scalar(
+            select(func.count(InventoryItem.id))
+            .where(InventoryItem.is_active.is_(True))
+            .where(InventoryItem.quantity_reserved > 0)
+        ) or 0
+
+    @staticmethod
+    def reserved_stock_value_cents(db: Session) -> int:
+        return db.scalar(
+            select(func.coalesce(func.sum(InventoryItem.quantity_reserved * InventoryItem.selling_price_cents), 0))
+            .where(InventoryItem.is_active.is_(True))
+            .where(InventoryItem.selling_price_cents.is_not(None))
+        ) or 0
+
     @staticmethod
     def latest_movements(db: Session, limit: int = 5) -> list[InventoryStockMovement]:
         return list(

backend/hermes/app/schemas/repair_estimate.py

@@ -18,7 +18,9 @@ def normalize_text(value: object) -> str:
 
 class RepairEstimateItemPayload(BaseModel):
     item_type: EstimateItemType = "other"
-    title: str = Field(min_length=1, max_length=255)
+    inventory_item_id: int | None = None
+    inventory_price_overridden: bool = False
+    title: str = Field(default="", max_length=255)
     description: str | None = None
     quantity: Decimal = Field(gt=Decimal("0"))
     unit: str = Field(default="Stk.", max_length=40)
@@ -38,6 +40,12 @@ class RepairEstimateItemPayload(BaseModel):
             return value.strip().replace(",", ".")
         return value
 
+    @model_validator(mode="after")
+    def validate_inventory_or_title(self):
+        if self.inventory_item_id is None and not self.title.strip():
+            raise ValueError("Titel ist erforderlich")
+        return self
+
 
 class RepairEstimatePayload(BaseModel):
     title: str = Field(min_length=1, max_length=255)
@@ -85,6 +93,11 @@ class RepairEstimateUpdate(RepairEstimatePayload):
 class RepairEstimateItemResponse(BaseModel):
     id: int
     estimate_id: int
+    inventory_item_id: int | None
+    inventory_snapshot_name: str
+    inventory_snapshot_sku: str
+    inventory_snapshot_manufacturer: str | None
+    inventory_snapshot_part_number: str | None
     position: int
     item_type: EstimateItemType
     title: str
@@ -139,6 +152,10 @@ class RepairEstimateResponse(BaseModel):
 
 class PublicEstimateItemResponse(BaseModel):
     item_type: EstimateItemType
+    inventory_snapshot_name: str
+    inventory_snapshot_sku: str
+    inventory_snapshot_manufacturer: str | None
+    inventory_snapshot_part_number: str | None
     title: str
     description: str | None
     quantity: Decimal

backend/hermes/app/services/audit_service.py

@@ -188,6 +188,11 @@ def action_title(action: str) -> str:
         "inventory.stock.reserve": "Bestand reserviert",
         "inventory.stock.release": "Reservierung aufgehoben",
         "inventory.stock.consume": "Bestand verbraucht",
+        "inventory.estimate.reserve": "KV reserviert Lagerbestand",
+        "inventory.estimate.release": "KV-Reservierung aufgehoben",
+        "inventory.estimate.consume": "Reservierung verbraucht",
+        "inventory.estimate.price_override": "Lagerartikelpreis manuell überschrieben",
+        "inventory.stock.low": "Lagerbestand knapp",
         "inventory.categories.create": "Lagerkategorie erstellt",
         "inventory.categories.update": "Lagerkategorie geändert",
         "inventory.categories.delete": "Lagerkategorie gelöscht",

backend/hermes/app/services/inventory_service.py

@@ -1,5 +1,6 @@
 import re
 import unicodedata
+from decimal import Decimal
 from typing import TypeVar
 
 from fastapi import HTTPException, status
@@ -8,6 +9,7 @@ from sqlalchemy.orm import Session
 from starlette.requests import Request
 
 from app.models.inventory import InventoryCategory, InventoryItem, InventoryLocation, InventorySupplier
+from app.models.repair_estimate import RepairEstimate
 from app.models.user import User
 from app.repositories.inventory_repository import InventoryRepository
 from app.schemas.inventory import (
@@ -194,6 +196,83 @@ class InventoryService:
         InventoryService._add_movement(db, item, "consumption", payload, actor_user_id=actor.id)
         return InventoryService._commit_stock_action(db, item, before_data, "inventory.stock.consume", actor, request)
 
+    @staticmethod
+    def reserve_for_estimate(db: Session, estimate: RepairEstimate, *, actor_user_id: int | None) -> None:
+        for estimate_item in estimate.items:
+            if estimate_item.inventory_item_id is None:
+                continue
+            item = InventoryRepository.get_item(db, estimate_item.inventory_item_id)
+            if item is None or not item.is_active:
+                raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail=f"Lagerartikel für Position {estimate_item.position} ist nicht mehr aktiv")
+            quantity = InventoryService._estimate_quantity_to_int(estimate_item.quantity, estimate_item.position)
+            if quantity > item.quantity_available:
+                raise HTTPException(
+                    status_code=status.HTTP_409_CONFLICT,
+                    detail=f"Nicht genügend verfügbarer Bestand für {item.sku} · {item.name}",
+                )
+            item.quantity_reserved += quantity
+            InventoryService._recalculate_available(item)
+            InventoryRepository.create_movement(
+                db,
+                item_id=item.id,
+                movement_type="reservation",
+                quantity=quantity,
+                reason="estimate_reserved",
+                reference_type="repair_estimate",
+                reference_id=estimate.id,
+                note=f"Kostenvoranschlag {estimate.estimate_number}",
+                actor_user_id=actor_user_id,
+            )
+
+    @staticmethod
+    def release_estimate_reservation(db: Session, estimate: RepairEstimate, *, actor_user_id: int | None) -> None:
+        for estimate_item in estimate.items:
+            if estimate_item.inventory_item_id is None:
+                continue
+            item = InventoryRepository.get_item(db, estimate_item.inventory_item_id)
+            if item is None:
+                continue
+            quantity = InventoryService._estimate_quantity_to_int(estimate_item.quantity, estimate_item.position)
+            item.quantity_reserved = max(0, item.quantity_reserved - quantity)
+            InventoryService._recalculate_available(item)
+            InventoryRepository.create_movement(
+                db,
+                item_id=item.id,
+                movement_type="release",
+                quantity=quantity,
+                reason="estimate_released",
+                reference_type="repair_estimate",
+                reference_id=estimate.id,
+                note=f"Kostenvoranschlag {estimate.estimate_number}",
+                actor_user_id=actor_user_id,
+            )
+
+    @staticmethod
+    def consume_reserved_stock(db: Session, estimate: RepairEstimate, *, actor_user_id: int | None) -> None:
+        for estimate_item in estimate.items:
+            if estimate_item.inventory_item_id is None:
+                continue
+            item = InventoryRepository.get_item(db, estimate_item.inventory_item_id)
+            if item is None:
+                continue
+            quantity = InventoryService._estimate_quantity_to_int(estimate_item.quantity, estimate_item.position)
+            if quantity > item.quantity_reserved or quantity > item.quantity_on_hand:
+                raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail=f"Reservierter Bestand für {item.sku} reicht nicht aus")
+            item.quantity_reserved -= quantity
+            item.quantity_on_hand -= quantity
+            InventoryService._recalculate_available(item)
+            InventoryRepository.create_movement(
+                db,
+                item_id=item.id,
+                movement_type="consumption",
+                quantity=quantity,
+                reason="estimate_consumed",
+                reference_type="repair_estimate",
+                reference_id=estimate.id,
+                note=f"Kostenvoranschlag {estimate.estimate_number}",
+                actor_user_id=actor_user_id,
+            )
+
     @staticmethod
     def create_category(db: Session, payload: InventoryCategoryPayload, *, actor: User, request: Request) -> InventoryCategory:
         category = InventoryCategory(name=payload.name, slug=_slugify(payload.name), description=payload.description)
@@ -260,6 +339,18 @@ class InventoryService:
         if payload.quantity <= 0:
             raise HTTPException(status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, detail="Menge muss größer 0 sein")
 
+    @staticmethod
+    def _estimate_quantity_to_int(quantity: Decimal, position: int) -> int:
+        if quantity != quantity.to_integral_value():
+            raise HTTPException(
+                status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+                detail=f"Lagerposition {position} muss eine ganze Menge verwenden",
+            )
+        normalized = int(quantity)
+        if normalized <= 0:
+            raise HTTPException(status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, detail=f"Lagerposition {position} benötigt eine Menge größer 0")
+        return normalized
+
     @staticmethod
     def _add_movement(db: Session, item: InventoryItem, movement_type: str, payload: InventoryStockAction, *, actor_user_id: int) -> None:
         InventoryService._recalculate_available(item)

backend/hermes/app/services/repair_estimate_service.py

@@ -10,6 +10,7 @@ from starlette.requests import Request
 from app.models.repair import Repair
 from app.models.repair_estimate import RepairEstimate, RepairEstimateItem
 from app.models.user import User
+from app.repositories.inventory_repository import InventoryRepository
 from app.repositories.repair_estimate_repository import RepairEstimateRepository
 from app.repositories.repair_repository import RepairRepository
 from app.schemas.repair import RepairStatusUpdate
@@ -24,6 +25,7 @@ from app.schemas.repair_estimate import (
     calculate_tax,
 )
 from app.services.audit_service import write_audit_log
+from app.services.inventory_service import InventoryService
 from app.services.repair_public_link_service import RepairPublicLinkService
 from app.services.system_settings_service import SystemSettingsService
 
@@ -53,6 +55,7 @@ def _audit_estimate_data(estimate: RepairEstimate) -> dict:
         "approved_at": estimate.approved_at,
         "declined_at": estimate.declined_at,
         "created_by_user_id": estimate.created_by_user_id,
+        "inventory_item_ids": [item.inventory_item_id for item in estimate.items if item.inventory_item_id is not None],
     }
 
 
@@ -66,7 +69,8 @@ class RepairEstimateService:
             status="draft",
             created_by_user_id=actor.id,
         )
-        RepairEstimateService._apply_payload(estimate, payload)
+        price_overrides = RepairEstimateService._collect_price_overrides(db, payload.items)
+        RepairEstimateService._apply_payload(db, estimate, payload)
         try:
             db.add(estimate)
             db.flush()
@@ -92,6 +96,7 @@ class RepairEstimateService:
             after_data=_audit_estimate_data(estimate),
             metadata={"repair_id": repair.id, "repair_number": repair.repair_number},
         )
+        RepairEstimateService._write_price_override_audits(db, estimate, price_overrides, actor=actor, request=request)
         return estimate
 
     @staticmethod
@@ -99,7 +104,24 @@ class RepairEstimateService:
         if estimate.status not in {"draft", "sent"}:
             raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Dieser Kostenvoranschlag kann nicht mehr bearbeitet werden")
         before_data = _audit_estimate_data(estimate)
-        RepairEstimateService._apply_payload(estimate, payload)
+        price_overrides = RepairEstimateService._collect_price_overrides(db, payload.items)
+        was_sent = estimate.status == "sent"
+        if was_sent:
+            InventoryService.release_estimate_reservation(db, estimate, actor_user_id=actor.id)
+        RepairEstimateService._apply_payload(db, estimate, payload)
+        if was_sent:
+            InventoryService.reserve_for_estimate(db, estimate, actor_user_id=actor.id)
+            write_audit_log(
+                db,
+                action="inventory.estimate.reserve",
+                entity_type="repair_estimates",
+                entity_id=estimate.id,
+                entity_label=_estimate_label(estimate),
+                actor=actor,
+                request=request,
+                metadata={"repair_id": repair.id, "repair_number": repair.repair_number},
+            )
+            RepairEstimateService._write_low_stock_audits(db, estimate, actor=actor, request=request)
         RepairEstimateRepository.add_event(db, estimate_id=estimate.id, event_type="updated", actor_type="user", actor_user_id=actor.id, commit=False)
         db.commit()
         db.refresh(estimate)
@@ -116,14 +138,27 @@ class RepairEstimateService:
             after_data=_audit_estimate_data(updated),
             metadata={"repair_id": repair.id, "repair_number": repair.repair_number},
         )
+        RepairEstimateService._write_price_override_audits(db, updated, price_overrides, actor=actor, request=request)
         return updated
 
     @staticmethod
     def delete(db: Session, repair: Repair, estimate: RepairEstimate, *, actor: User, request: Request) -> None:
-        if estimate.status not in {"draft", "cancelled"}:
-            raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Nur Entwürfe oder stornierte Kostenvoranschläge können gelöscht werden")
+        if estimate.status not in {"draft", "sent", "cancelled"}:
+            raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Nur Entwürfe, gesendete oder stornierte Kostenvoranschläge können gelöscht werden")
         before_data = _audit_estimate_data(estimate)
         label = _estimate_label(estimate)
+        if estimate.status == "sent":
+            InventoryService.release_estimate_reservation(db, estimate, actor_user_id=actor.id)
+            write_audit_log(
+                db,
+                action="inventory.estimate.release",
+                entity_type="repair_estimates",
+                entity_id=estimate.id,
+                entity_label=label,
+                actor=actor,
+                request=request,
+                metadata={"reason": "estimate_deleted", "repair_id": repair.id, "repair_number": repair.repair_number},
+            )
         RepairEstimateRepository.delete(db, estimate)
         write_audit_log(
             db,
@@ -145,6 +180,10 @@ class RepairEstimateService:
         if not repair.customer_email:
             raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Für diese Reparatur ist keine Kunden-E-Mail hinterlegt")
 
+        was_sent = estimate.status == "sent"
+        if not was_sent:
+            InventoryService.reserve_for_estimate(db, estimate, actor_user_id=actor.id)
+
         link = RepairPublicLinkService.create_with_audit(
             db,
             repair,
@@ -155,6 +194,18 @@ class RepairEstimateService:
         public_status_url = link.public_status_path
         estimate = RepairEstimateRepository.mark_sent(db, estimate)
         RepairEstimateRepository.add_event(db, estimate_id=estimate.id, event_type="sent", actor_type="user", actor_user_id=actor.id)
+        if not was_sent:
+            write_audit_log(
+                db,
+                action="inventory.estimate.reserve",
+                entity_type="repair_estimates",
+                entity_id=estimate.id,
+                entity_label=_estimate_label(estimate),
+                actor=actor,
+                request=request,
+                metadata={"repair_id": repair.id, "repair_number": repair.repair_number},
+            )
+            RepairEstimateService._write_low_stock_audits(db, estimate, actor=actor, request=request)
         smtp_config = SystemSettingsService.get_smtp_runtime_config(db)
         mail_sent = False
         if smtp_config.is_configured:
@@ -200,6 +251,9 @@ class RepairEstimateService:
     def cancel(db: Session, repair: Repair, estimate: RepairEstimate, *, actor: User, request: Request) -> RepairEstimate:
         if estimate.status in {"approved", "declined", "cancelled"}:
             raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Dieser Kostenvoranschlag kann nicht storniert werden")
+        was_sent = estimate.status == "sent"
+        if was_sent:
+            InventoryService.release_estimate_reservation(db, estimate, actor_user_id=actor.id)
         estimate.status = "cancelled"
         RepairEstimateRepository.add_event(db, estimate_id=estimate.id, event_type="cancelled", actor_type="user", actor_user_id=actor.id, commit=False)
         db.commit()
@@ -214,6 +268,17 @@ class RepairEstimateService:
             request=request,
             metadata={"repair_id": repair.id, "repair_number": repair.repair_number},
         )
+        if was_sent:
+            write_audit_log(
+                db,
+                action="inventory.estimate.release",
+                entity_type="repair_estimates",
+                entity_id=estimate.id,
+                entity_label=_estimate_label(estimate),
+                actor=actor,
+                request=request,
+                metadata={"reason": "estimate_cancelled", "repair_id": repair.id, "repair_number": repair.repair_number},
+            )
         return RepairEstimateRepository.get(db, repair_id=repair.id, estimate_id=estimate.id) or estimate
 
     @staticmethod
@@ -233,6 +298,10 @@ class RepairEstimateService:
             items=[
                 PublicEstimateItemResponse(
                     item_type=item.item_type,
+                    inventory_snapshot_name=item.inventory_snapshot_name,
+                    inventory_snapshot_sku=item.inventory_snapshot_sku,
+                    inventory_snapshot_manufacturer=item.inventory_snapshot_manufacturer,
+                    inventory_snapshot_part_number=item.inventory_snapshot_part_number,
                     title=item.title,
                     description=item.description,
                     quantity=item.quantity,
@@ -272,6 +341,7 @@ class RepairEstimateService:
             repair_status = "waiting_for_customer"
             note = "Kunde hat den Kostenvoranschlag abgelehnt"
             audit_action = "repair_estimates.decline"
+            InventoryService.release_estimate_reservation(db, estimate, actor_user_id=None)
         else:
             event_type = "question"
             repair_status = "waiting_for_customer"
@@ -291,17 +361,27 @@ class RepairEstimateService:
             request=request,
             metadata={"repair_id": repair.id, "repair_number": repair.repair_number, "actor": "customer"},
         )
+        if decision == "decline":
+            write_audit_log(
+                db,
+                action="inventory.estimate.release",
+                entity_type="repair_estimates",
+                entity_id=estimate.id,
+                entity_label=_estimate_label(estimate),
+                request=request,
+                metadata={"reason": "estimate_declined", "repair_id": repair.id, "repair_number": repair.repair_number, "actor": "customer"},
+            )
         return RepairEstimateRepository.get(db, repair_id=repair.id, estimate_id=estimate.id) or estimate
 
     @staticmethod
-    def _apply_payload(estimate: RepairEstimate, payload: RepairEstimateCreate | RepairEstimateUpdate) -> None:
+    def _apply_payload(db: Session, estimate: RepairEstimate, payload: RepairEstimateCreate | RepairEstimateUpdate) -> None:
         estimate.title = payload.title
         estimate.customer_message = payload.customer_message
         estimate.internal_note = payload.internal_note
         estimate.tax_rate_percent = payload.tax_rate_percent
         estimate.currency = payload.currency
         estimate.valid_until = payload.valid_until
-        items, subtotal = RepairEstimateService._build_items(payload.items)
+        items, subtotal = RepairEstimateService._build_items(db, payload.items)
         tax_cents = calculate_tax(subtotal, payload.tax_rate_percent)
         estimate.subtotal_cents = subtotal
         estimate.tax_cents = tax_cents
@@ -309,26 +389,121 @@ class RepairEstimateService:
         estimate.items = items
 
     @staticmethod
-    def _build_items(payload_items: list[RepairEstimateItemPayload]) -> tuple[list[RepairEstimateItem], int]:
+    def _build_items(
+        db: Session,
+        payload_items: list[RepairEstimateItemPayload],
+    ) -> tuple[list[RepairEstimateItem], int]:
         items: list[RepairEstimateItem] = []
         subtotal = 0
         for index, payload in enumerate(payload_items, start=1):
-            total = calculate_item_total(payload.quantity, payload.unit_price_cents)
+            item_type = payload.item_type
+            title = payload.title
+            description = payload.description
+            unit = payload.unit
+            unit_price_cents = payload.unit_price_cents
+            inventory_item_id = payload.inventory_item_id
+            inventory_snapshot_name = ""
+            inventory_snapshot_sku = ""
+            inventory_snapshot_manufacturer = None
+            inventory_snapshot_part_number = None
+            if inventory_item_id is not None:
+                inventory_item = InventoryRepository.get_item(db, inventory_item_id)
+                if inventory_item is None or not inventory_item.is_active:
+                    raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail=f"Lagerartikel in Position {index} nicht gefunden")
+                item_type = "part"
+                title = inventory_item.name
+                unit = inventory_item.unit
+                inventory_snapshot_name = inventory_item.name
+                inventory_snapshot_sku = inventory_item.sku
+                inventory_snapshot_manufacturer = inventory_item.manufacturer
+                inventory_snapshot_part_number = inventory_item.manufacturer_part_number
+                if not payload.inventory_price_overridden:
+                    unit_price_cents = inventory_item.selling_price_cents or 0
+            total = calculate_item_total(payload.quantity, unit_price_cents)
             subtotal += total
             items.append(
                 RepairEstimateItem(
+                    inventory_item_id=inventory_item_id,
+                    inventory_snapshot_name=inventory_snapshot_name,
+                    inventory_snapshot_sku=inventory_snapshot_sku,
+                    inventory_snapshot_manufacturer=inventory_snapshot_manufacturer,
+                    inventory_snapshot_part_number=inventory_snapshot_part_number,
                     position=index,
-                    item_type=payload.item_type,
-                    title=payload.title,
-                    description=payload.description,
+                    item_type=item_type,
+                    title=title,
+                    description=description,
                     quantity=payload.quantity,
-                    unit=payload.unit,
-                    unit_price_cents=payload.unit_price_cents,
+                    unit=unit,
+                    unit_price_cents=unit_price_cents,
                     total_cents=total,
                 )
             )
         return items, subtotal
 
+    @staticmethod
+    def _collect_price_overrides(db: Session, payload_items: list[RepairEstimateItemPayload]) -> list[dict]:
+        overrides: list[dict] = []
+        for payload in payload_items:
+            if payload.inventory_item_id is None or not payload.inventory_price_overridden:
+                continue
+            inventory_item = InventoryRepository.get_item(db, payload.inventory_item_id)
+            if inventory_item is None:
+                continue
+            default_price = inventory_item.selling_price_cents or 0
+            if payload.unit_price_cents != default_price:
+                overrides.append({
+                    "inventory_item_id": inventory_item.id,
+                    "label": f"{inventory_item.sku} · {inventory_item.name}",
+                    "default_price_cents": default_price,
+                    "override_price_cents": payload.unit_price_cents,
+                })
+        return overrides
+
+    @staticmethod
+    def _write_price_override_audits(db: Session, estimate: RepairEstimate, overrides: list[dict], *, actor: User, request: Request) -> None:
+        for override in overrides:
+            write_audit_log(
+                db,
+                action="inventory.estimate.price_override",
+                entity_type="inventory_items",
+                entity_id=override["inventory_item_id"],
+                entity_label=override["label"],
+                actor=actor,
+                request=request,
+                metadata={
+                    "estimate_id": estimate.id,
+                    "estimate_number": estimate.estimate_number,
+                    "default_price_cents": override["default_price_cents"],
+                    "override_price_cents": override["override_price_cents"],
+                },
+            )
+
+    @staticmethod
+    def _write_low_stock_audits(db: Session, estimate: RepairEstimate, *, actor: User, request: Request) -> None:
+        seen_item_ids: set[int] = set()
+        for estimate_item in estimate.items:
+            if estimate_item.inventory_item_id is None or estimate_item.inventory_item_id in seen_item_ids:
+                continue
+            seen_item_ids.add(estimate_item.inventory_item_id)
+            inventory_item = InventoryRepository.get_item(db, estimate_item.inventory_item_id)
+            if inventory_item is None or inventory_item.quantity_available > inventory_item.reorder_level:
+                continue
+            write_audit_log(
+                db,
+                action="inventory.stock.low",
+                entity_type="inventory_items",
+                entity_id=inventory_item.id,
+                entity_label=f"{inventory_item.sku} · {inventory_item.name}",
+                actor=actor,
+                request=request,
+                metadata={
+                    "estimate_id": estimate.id,
+                    "estimate_number": estimate.estimate_number,
+                    "quantity_available": inventory_item.quantity_available,
+                    "reorder_level": inventory_item.reorder_level,
+                },
+            )
+
     @staticmethod
     def _estimate_mail_text(repair: Repair, estimate: RepairEstimate, public_status_url: str) -> str:
         return (

frontend/athena/app/api/inventory/items/search/route.ts

@@ -0,0 +1,7 @@
+import { NextRequest } from "next/server";
+
+import { proxyHermesRequest } from "@/lib/server/hermes-proxy";
+
+export async function GET(request: NextRequest) {
+  return proxyHermesRequest(request, `/inventory/items/search${request.nextUrl.search}`);
+}

frontend/athena/components/repairs/RepairEstimatesSection.tsx

@@ -2,7 +2,7 @@
 
 import { useCallback, useEffect, useMemo, useState } from "react";
 import type { ReactNode } from "react";
-import { FileCheck2, Plus, Send, Trash2, XCircle } from "lucide-react";
+import { AlertTriangle, FileCheck2, PackageSearch, Plus, Send, Trash2, XCircle } from "lucide-react";
 
 import ConfirmDialog from "@/components/common/ConfirmDialog";
 import { useToast } from "@/components/common/ToastProvider";
@@ -17,6 +17,10 @@ import {
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { api } from "@/lib/api";
+import type {
+  InventoryCategory,
+  InventoryItem,
+} from "@/types/inventory";
 import type {
   RepairEstimate,
   RepairEstimateItemType,
@@ -89,6 +93,12 @@ function dateTime(value: string | null) {
 
 type EstimateFormItem = {
   item_type: RepairEstimateItemType;
+  inventory_item_id: number | null;
+  inventory_snapshot_name: string;
+  inventory_snapshot_sku: string;
+  inventory_snapshot_manufacturer: string | null;
+  inventory_snapshot_part_number: string | null;
+  inventory_price_overridden: boolean;
   title: string;
   description: string | null;
   quantity: string;
@@ -118,6 +128,12 @@ function centsToEuroInput(cents: number): string {
 function emptyItem(): EstimateFormItem {
   return {
     item_type: "labor",
+    inventory_item_id: null,
+    inventory_snapshot_name: "",
+    inventory_snapshot_sku: "",
+    inventory_snapshot_manufacturer: null,
+    inventory_snapshot_part_number: null,
+    inventory_price_overridden: false,
     title: "",
     description: "",
     quantity: "1.00",
@@ -167,6 +183,14 @@ export default function RepairEstimatesSection({
   const [saving, setSaving] = useState(false);
   const [pendingId, setPendingId] = useState<number | null>(null);
   const [deleteTarget, setDeleteTarget] = useState<RepairEstimate | null>(null);
+  const [inventoryDialogOpen, setInventoryDialogOpen] = useState(false);
+  const [inventoryItems, setInventoryItems] = useState<InventoryItem[]>([]);
+  const [inventoryCategories, setInventoryCategories] = useState<InventoryCategory[]>([]);
+  const [inventorySearch, setInventorySearch] = useState("");
+  const [inventoryCategory, setInventoryCategory] = useState("all");
+  const [inventoryManufacturer, setInventoryManufacturer] = useState("");
+  const [inventoryLoading, setInventoryLoading] = useState(false);
+  const [inventoryError, setInventoryError] = useState("");
 
   const loadEstimates = useCallback(async () => {
     if (!canRead) {
@@ -191,6 +215,38 @@ export default function RepairEstimatesSection({
     });
   }, [loadEstimates]);
 
+  const searchInventoryItems = useCallback(async () => {
+    setInventoryLoading(true);
+    setInventoryError("");
+    try {
+      const params = new URLSearchParams();
+      params.set("limit", "20");
+      if (inventorySearch.trim()) params.set("q", inventorySearch.trim());
+      if (inventoryCategory !== "all") params.set("category", inventoryCategory);
+      if (inventoryManufacturer.trim()) params.set("manufacturer", inventoryManufacturer.trim());
+      const [itemsResponse, categoriesResponse] = await Promise.all([
+        api.get<InventoryItem[]>(`/inventory/items/search?${params.toString()}`),
+        api.get<InventoryCategory[]>("/inventory/categories"),
+      ]);
+      setInventoryItems(itemsResponse.data);
+      setInventoryCategories(categoriesResponse.data);
+    } catch (err) {
+      setInventoryError(getErrorMessage(err));
+    } finally {
+      setInventoryLoading(false);
+    }
+  }, [inventoryCategory, inventoryManufacturer, inventorySearch]);
+
+  useEffect(() => {
+    if (!inventoryDialogOpen) {
+      return;
+    }
+    const id = window.setTimeout(() => {
+      void searchInventoryItems();
+    }, 200);
+    return () => window.clearTimeout(id);
+  }, [inventoryDialogOpen, searchInventoryItems]);
+
   const clientSubtotal = useMemo(() => payload.items.reduce((sum, item) => {
     const quantity = Number(item.quantity.replace(",", ".")) || 0;
     const unitPriceCents = parseEuroToCents(item.unit_price_euros) ?? 0;
@@ -215,6 +271,12 @@ export default function RepairEstimatesSection({
       valid_until: estimate.valid_until,
       items: estimate.items.map((item) => ({
         item_type: item.item_type,
+        inventory_item_id: item.inventory_item_id ?? null,
+        inventory_snapshot_name: item.inventory_snapshot_name,
+        inventory_snapshot_sku: item.inventory_snapshot_sku,
+        inventory_snapshot_manufacturer: item.inventory_snapshot_manufacturer,
+        inventory_snapshot_part_number: item.inventory_snapshot_part_number,
+        inventory_price_overridden: false,
         title: item.title,
         description: item.description ?? "",
         quantity: String(item.quantity),
@@ -232,6 +294,25 @@ export default function RepairEstimatesSection({
     }));
   }
 
+  function addInventoryItem(item: InventoryItem) {
+    const formItem: EstimateFormItem = {
+      item_type: "part",
+      inventory_item_id: item.id,
+      inventory_snapshot_name: item.name,
+      inventory_snapshot_sku: item.sku,
+      inventory_snapshot_manufacturer: item.manufacturer,
+      inventory_snapshot_part_number: item.manufacturer_part_number,
+      inventory_price_overridden: false,
+      title: item.name,
+      description: item.description ?? "",
+      quantity: "1",
+      unit: item.unit,
+      unit_price_euros: centsToEuroInput(item.selling_price_cents ?? 0),
+    };
+    setPayload((current) => ({ ...current, items: [...current.items, formItem] }));
+    setInventoryDialogOpen(false);
+  }
+
   async function saveEstimate() {
     setSaving(true);
     try {
@@ -254,6 +335,8 @@ export default function RepairEstimatesSection({
         valid_until: payload.valid_until || null,
         items: payload.items.map((item) => ({
           item_type: item.item_type,
+          inventory_item_id: item.inventory_item_id,
+          inventory_price_overridden: item.inventory_price_overridden,
           title: item.title.trim(),
           description: item.description?.trim() || null,
           quantity: item.quantity.replace(",", "."),
@@ -371,7 +454,15 @@ export default function RepairEstimatesSection({
                   <div key={item.id} className="flex items-start justify-between gap-3 p-3 text-sm">
                     <div>
                       <p className="font-medium text-slate-950">{item.position}. {item.title}</p>
-                      <p className="text-xs text-slate-500">{itemTypeLabels[item.item_type]} · {item.quantity} {item.unit} × {money(item.unit_price_cents, estimate.currency)}</p>
+                      <p className="text-xs text-slate-500">
+                        {item.inventory_item_id ? `Lagerartikel · ${item.inventory_snapshot_sku} · ` : ""}
+                        {itemTypeLabels[item.item_type]} · {item.quantity} {item.unit} × {money(item.unit_price_cents, estimate.currency)}
+                      </p>
+                      {item.inventory_item_id && (
+                        <p className="mt-1 text-xs text-slate-500">
+                          {item.inventory_snapshot_manufacturer || "Hersteller nicht angegeben"} · {item.inventory_snapshot_name}
+                        </p>
+                      )}
                     </div>
                     <p className="font-medium text-slate-950">{money(item.total_cents, estimate.currency)}</p>
                   </div>
@@ -409,18 +500,32 @@ export default function RepairEstimatesSection({
             <div className="space-y-3">
               <div className="flex items-center justify-between">
                 <h4 className="font-semibold text-slate-950">Positionen</h4>
-                <Button type="button" variant="outline" size="sm" onClick={() => setPayload((current) => ({ ...current, items: [...current.items, emptyItem()] }))}><Plus />Position</Button>
+                <div className="flex flex-wrap gap-2">
+                  <Button type="button" variant="outline" size="sm" onClick={() => setInventoryDialogOpen(true)}><PackageSearch />Lagerartikel auswählen</Button>
+                  <Button type="button" variant="outline" size="sm" onClick={() => setPayload((current) => ({ ...current, items: [...current.items, emptyItem()] }))}><Plus />Position</Button>
+                </div>
               </div>
               {payload.items.map((item, index) => (
                 <div key={index} className="rounded-lg border bg-slate-50 p-3">
+                  {item.inventory_item_id && (
+                    <div className="mb-3 flex flex-col gap-2 rounded-lg border bg-white p-3 text-sm text-slate-600 sm:flex-row sm:items-center sm:justify-between">
+                      <div>
+                        <span className="font-semibold text-slate-950">Lagerartikel</span> · {item.inventory_snapshot_sku} · {item.inventory_snapshot_manufacturer || "Hersteller nicht angegeben"}
+                      </div>
+                      <label className="flex items-center gap-2 text-xs font-medium text-slate-600">
+                        <input type="checkbox" checked={item.inventory_price_overridden} onChange={(event) => updateItem(index, { inventory_price_overridden: event.target.checked })} />
+                        Preis manuell überschreiben
+                      </label>
+                    </div>
+                  )}
                   <div className="grid gap-3 md:grid-cols-[1fr_1fr_0.7fr_0.7fr_0.8fr_auto]">
-                    <select className="h-8 rounded-lg border border-input bg-white px-2 text-sm" value={item.item_type} onChange={(event) => updateItem(index, { item_type: event.target.value as RepairEstimateItemType })}>
+                    <select className="h-8 rounded-lg border border-input bg-white px-2 text-sm" value={item.item_type} disabled={Boolean(item.inventory_item_id)} onChange={(event) => updateItem(index, { item_type: event.target.value as RepairEstimateItemType })}>
                       {Object.entries(itemTypeLabels).map(([value, label]) => <option key={value} value={value}>{label}</option>)}
                     </select>
-                    <Input placeholder="Titel" value={item.title} onChange={(event) => updateItem(index, { title: event.target.value })} />
+                    <Input placeholder="Titel" value={item.title} readOnly={Boolean(item.inventory_item_id)} onChange={(event) => updateItem(index, { title: event.target.value })} />
                     <Input placeholder="Menge" value={item.quantity} onChange={(event) => updateItem(index, { quantity: event.target.value })} />
-                    <Input placeholder="Einheit" value={item.unit} onChange={(event) => updateItem(index, { unit: event.target.value })} />
-                    <Input inputMode="decimal" placeholder="Einzelpreis €" value={item.unit_price_euros} onChange={(event) => updateItem(index, { unit_price_euros: event.target.value })} />
+                    <Input placeholder="Einheit" value={item.unit} readOnly={Boolean(item.inventory_item_id)} onChange={(event) => updateItem(index, { unit: event.target.value })} />
+                    <Input inputMode="decimal" placeholder="Einzelpreis €" value={item.unit_price_euros} readOnly={Boolean(item.inventory_item_id && !item.inventory_price_overridden)} onChange={(event) => updateItem(index, { unit_price_euros: event.target.value })} />
                     <Button type="button" variant="ghost" size="icon" disabled={payload.items.length === 1} onClick={() => setPayload((current) => ({ ...current, items: current.items.filter((_, itemIndex) => itemIndex !== index) }))} aria-label="Position entfernen"><Trash2 /></Button>
                   </div>
                   <Input className="mt-3" placeholder="Beschreibung optional" value={item.description ?? ""} onChange={(event) => updateItem(index, { description: event.target.value })} />
@@ -442,6 +547,65 @@ export default function RepairEstimatesSection({
         </DialogContent>
       </Dialog>
 
+      <Dialog open={inventoryDialogOpen} onOpenChange={setInventoryDialogOpen}>
+        <DialogContent className="sm:max-w-4xl">
+          <DialogHeader>
+            <DialogTitle>Lagerartikel auswählen</DialogTitle>
+            <DialogDescription>Aktive Artikel werden als KV-Position übernommen. Preis und Stammdaten werden beim Speichern serverseitig geprüft.</DialogDescription>
+          </DialogHeader>
+
+          <div className="grid gap-4">
+            <div className="grid gap-3 md:grid-cols-[1fr_220px_180px]">
+              <Input placeholder="SKU, Name, Hersteller oder Gerät suchen" value={inventorySearch} onChange={(event) => setInventorySearch(event.target.value)} />
+              <select className="h-8 rounded-lg border border-input bg-white px-2 text-sm" value={inventoryCategory} onChange={(event) => setInventoryCategory(event.target.value)}>
+                <option value="all">Alle Kategorien</option>
+                {inventoryCategories.map((category) => <option key={category.id} value={category.id}>{category.name}</option>)}
+              </select>
+              <Input placeholder="Hersteller" value={inventoryManufacturer} onChange={(event) => setInventoryManufacturer(event.target.value)} />
+            </div>
+
+            {inventoryError ? (
+              <p className="rounded-lg border bg-red-50 p-3 text-sm text-red-700">{inventoryError}</p>
+            ) : inventoryLoading ? (
+              <p className="rounded-lg border bg-slate-50 p-3 text-sm text-slate-500">Lagerartikel werden geladen...</p>
+            ) : inventoryItems.length === 0 ? (
+              <p className="rounded-lg border bg-slate-50 p-3 text-sm text-slate-500">Keine aktiven Lagerartikel gefunden.</p>
+            ) : (
+              <div className="max-h-[48vh] divide-y overflow-y-auto rounded-lg border">
+                {inventoryItems.map((item) => {
+                  const lowAfterSelection = item.quantity_available - 1 <= item.reorder_level;
+                  return (
+                    <button
+                      key={item.id}
+                      type="button"
+                      className="grid w-full gap-2 p-3 text-left hover:bg-slate-50 md:grid-cols-[1fr_auto]"
+                      onClick={() => addInventoryItem(item)}
+                    >
+                      <div>
+                        <p className="font-medium text-slate-950">{item.sku} · {item.name}</p>
+                        <p className="text-sm text-slate-500">
+                          {item.manufacturer || "Hersteller nicht angegeben"} · Verfügbar {item.quantity_available} {item.unit} · {item.location?.name ?? "Kein Lagerort"}
+                        </p>
+                        {lowAfterSelection && (
+                          <p className="mt-1 inline-flex items-center gap-1 text-xs font-medium text-amber-700">
+                            <AlertTriangle size={14} /> Auswahl erreicht oder unterschreitet den Mindestbestand.
+                          </p>
+                        )}
+                      </div>
+                      <span className="font-semibold text-slate-950">{money(item.selling_price_cents ?? 0, item.currency)}</span>
+                    </button>
+                  );
+                })}
+              </div>
+            )}
+          </div>
+
+          <DialogFooter>
+            <Button type="button" variant="outline" onClick={() => setInventoryDialogOpen(false)}>Schließen</Button>
+          </DialogFooter>
+        </DialogContent>
+      </Dialog>
+
       <ConfirmDialog
         open={Boolean(deleteTarget)}
         title="Kostenvoranschlag löschen?"

frontend/athena/types/repair.ts

@@ -166,6 +166,8 @@ export interface RepairDocument {
 
 export interface RepairEstimateItemPayload {
   item_type: RepairEstimateItemType;
+  inventory_item_id?: number | null;
+  inventory_price_overridden?: boolean;
   title: string;
   description: string | null;
   quantity: string;
@@ -186,6 +188,10 @@ export interface RepairEstimatePayload {
 export interface RepairEstimateItem extends RepairEstimateItemPayload {
   id: number;
   estimate_id: number;
+  inventory_snapshot_name: string;
+  inventory_snapshot_sku: string;
+  inventory_snapshot_manufacturer: string | null;
+  inventory_snapshot_part_number: string | null;
   position: number;
   total_cents: number;
   created_at: string;