Schritt 1: Fundament der Lebensmittel-Lagerverwaltung (Pantry)

Backend (FastAPI + PostgreSQL): Chargen mit MHD, FEFO-Auslagern,
Einheiten-Umrechnung (Stueck/g/ml + Packungen), Open-Food-Facts-Lookup
mit lokalem Fallback, JWT-Auth mit Rollen (Admin/Nutzer), erster Admin
beim Setup, Einkaufsliste, Ablaufwarnung, Lagerorte, pytest fuer FEFO.

Web-UI (React/Vite): Login, Dashboard, Ein-/Auslagern, Produkte,
Lagerorte, Benutzerverwaltung, Einkaufsliste - rollenabhaengig.

Deploy: docker-compose + install.sh (Docker-Autoinstall, Secrets),
README und Roadmap fuer Schritt 2 (iOS) und Schritt 3.

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

backend/app/schemas.py

@@ -0,0 +1,174 @@
+from __future__ import annotations
+
+from datetime import date, datetime
+
+from pydantic import BaseModel, ConfigDict, Field
+
+from .models import BaseUnit, Role
+
+
+# ---- Auth / Users ----
+class Token(BaseModel):
+    access_token: str
+    token_type: str = "bearer"
+    role: Role
+    username: str
+
+
+class UserOut(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+    id: int
+    username: str
+    role: Role
+    created_at: datetime
+
+
+class UserCreate(BaseModel):
+    username: str = Field(min_length=1, max_length=64)
+    password: str = Field(min_length=4, max_length=255)
+    role: Role = Role.user
+
+
+class UserUpdate(BaseModel):
+    password: str | None = Field(default=None, min_length=4, max_length=255)
+    role: Role | None = None
+
+
+# ---- Groups ----
+class GroupOut(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+    id: int
+    name: str
+    min_stock: float | None = None
+
+
+class GroupCreate(BaseModel):
+    name: str = Field(min_length=1, max_length=120)
+    min_stock: float | None = None
+
+
+# ---- Locations ----
+class LocationOut(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+    id: int
+    name: str
+    parent_id: int | None = None
+
+
+class LocationCreate(BaseModel):
+    name: str = Field(min_length=1, max_length=120)
+    parent_id: int | None = None
+
+
+# ---- Products ----
+class ProductBase(BaseModel):
+    barcode: str | None = None
+    name: str = Field(min_length=1, max_length=255)
+    brand: str | None = None
+    image_url: str | None = None
+    base_unit: BaseUnit = BaseUnit.piece
+    package_size: float | None = Field(default=None, gt=0)
+    group_id: int | None = None
+    min_stock: float | None = Field(default=None, ge=0)
+
+
+class ProductCreate(ProductBase):
+    pass
+
+
+class ProductUpdate(BaseModel):
+    barcode: str | None = None
+    name: str | None = Field(default=None, min_length=1, max_length=255)
+    brand: str | None = None
+    image_url: str | None = None
+    base_unit: BaseUnit | None = None
+    package_size: float | None = Field(default=None, gt=0)
+    group_id: int | None = None
+    min_stock: float | None = Field(default=None, ge=0)
+
+
+class ProductOut(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+    id: int
+    barcode: str | None
+    name: str
+    brand: str | None
+    image_url: str | None
+    base_unit: BaseUnit
+    package_size: float | None
+    group_id: int | None
+    min_stock: float | None
+    source: str
+    created_at: datetime
+    # angereichert:
+    stock: float = 0.0
+
+
+class LookupResult(BaseModel):
+    found: bool
+    existing_product: ProductOut | None = None
+    suggestion: dict | None = None
+
+
+# ---- Stock movements ----
+class CheckInRequest(BaseModel):
+    product_id: int | None = None
+    barcode: str | None = None
+    quantity: float = Field(gt=0)
+    unit: str
+    best_before: date | None = None
+    location_id: int | None = None
+    note: str | None = None
+
+
+class CheckOutRequest(BaseModel):
+    product_id: int | None = None
+    barcode: str | None = None
+    quantity: float = Field(gt=0)
+    unit: str
+    note: str | None = None
+
+
+class LotOut(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+    id: int
+    product_id: int
+    quantity: float
+    best_before: date | None
+    location_id: int | None
+    created_at: datetime
+
+
+class CheckInResponse(BaseModel):
+    lot: LotOut
+    product_stock: float
+
+
+class CheckOutResponse(BaseModel):
+    affected_lots: list[dict]
+    product_stock: float
+
+
+# ---- Views ----
+class ShoppingItem(BaseModel):
+    product_id: int
+    name: str
+    base_unit: BaseUnit
+    stock: float
+    min_stock: float
+    deficit: float
+
+
+class ExpiringItem(BaseModel):
+    lot_id: int
+    product_id: int
+    product_name: str
+    quantity: float
+    base_unit: BaseUnit
+    best_before: date
+    days_left: int
+
+
+class SettingOut(BaseModel):
+    key: str
+    value: str