Initial Version

backend/schemas.py

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+from pydantic import BaseModel, Field
+from typing import Optional, List
+from datetime import datetime
+
+# Base schemas
+class GroceryBase(BaseModel):
+    name: str
+    price: float = Field(..., gt=0)
+    category: str
+    organic: bool = False
+    weight: Optional[float] = None
+    weight_unit: str = "g"
+
+class GroceryCreate(GroceryBase):
+    pass
+
+class GroceryUpdate(BaseModel):
+    name: Optional[str] = None
+    price: Optional[float] = Field(None, gt=0)
+    category: Optional[str] = None
+    organic: Optional[bool] = None
+    weight: Optional[float] = None
+    weight_unit: Optional[str] = None
+
+class Grocery(GroceryBase):
+    id: int
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+    
+    class Config:
+        from_attributes = True
+
+# Shop schemas
+class ShopBase(BaseModel):
+    name: str
+    city: str
+    address: Optional[str] = None
+
+class ShopCreate(ShopBase):
+    pass
+
+class ShopUpdate(BaseModel):
+    name: Optional[str] = None
+    city: Optional[str] = None
+    address: Optional[str] = None
+
+class Shop(ShopBase):
+    id: int
+    created_at: datetime
+    
+    class Config:
+        from_attributes = True
+
+# Shopping Event schemas
+class GroceryInEvent(BaseModel):
+    grocery_id: int
+    amount: float = Field(..., gt=0)
+
+class ShoppingEventBase(BaseModel):
+    shop_id: int
+    date: Optional[datetime] = None
+    total_amount: Optional[float] = Field(None, ge=0)
+    notes: Optional[str] = None
+
+class ShoppingEventCreate(ShoppingEventBase):
+    groceries: List[GroceryInEvent] = []
+
+class ShoppingEventUpdate(BaseModel):
+    shop_id: Optional[int] = None
+    date: Optional[datetime] = None
+    total_amount: Optional[float] = Field(None, ge=0)
+    notes: Optional[str] = None
+    groceries: Optional[List[GroceryInEvent]] = None
+
+class ShoppingEventResponse(ShoppingEventBase):
+    id: int
+    created_at: datetime
+    shop: Shop
+    groceries: List[Grocery] = []
+    
+    class Config:
+        from_attributes = True
+
+# Statistics schemas
+class CategoryStats(BaseModel):
+    category: str
+    total_spent: float
+    item_count: int
+    avg_price: float
+
+class ShopStats(BaseModel):
+    shop_name: str
+    total_spent: float
+    visit_count: int
+    avg_per_visit: float