remove intermediate grocery table and add related_products feature

backend/schemas.py

@@ -60,31 +60,10 @@ class GroceryCategory(GroceryCategoryBase):
     class Config:
         from_attributes = True
 
-# Grocery schemas
-class GroceryBase(BaseModel):
-    name: str
-    category_id: int
-
-class GroceryCreate(GroceryBase):
-    pass
-
-class GroceryUpdate(BaseModel):
-    name: Optional[str] = None
-    category_id: Optional[int] = None
-
-class Grocery(GroceryBase):
-    id: int
-    created_at: datetime
-    updated_at: Optional[datetime] = None
-    category: GroceryCategory
-    
-    class Config:
-        from_attributes = True
-
-# Base schemas
+# Product schemas
 class ProductBase(BaseModel):
     name: str
-    grocery_id: int
+    category_id: int
     brand_id: Optional[int] = None
     organic: bool = False
     weight: Optional[float] = None
@@ -95,7 +74,7 @@ class ProductCreate(ProductBase):
 
 class ProductUpdate(BaseModel):
     name: Optional[str] = None
-    grocery_id: Optional[int] = None
+    category_id: Optional[int] = None
     brand_id: Optional[int] = None
     organic: Optional[bool] = None
     weight: Optional[float] = None
@@ -105,7 +84,7 @@ class Product(ProductBase):
     id: int
     created_at: datetime
     updated_at: Optional[datetime] = None
-    grocery: Grocery
+    category: GroceryCategory
     brand: Optional[Brand] = None
     
     class Config:
@@ -142,7 +121,7 @@ class ProductInEvent(BaseModel):
 class ProductWithEventData(BaseModel):
     id: int
     name: str
-    grocery: Grocery
+    category: GroceryCategory
     brand: Optional[Brand] = None
     organic: bool
     weight: Optional[float] = None
@@ -193,4 +172,30 @@ class ShopStats(BaseModel):
     avg_per_visit: float
 
 # Update forward references
-BrandInShop.model_rebuild() 
+BrandInShop.model_rebuild()
+
+# Related Products schemas
+class RelatedProductBase(BaseModel):
+    product_id: int
+    related_product_id: int
+    relationship_type: Optional[str] = None
+
+class RelatedProductCreate(RelatedProductBase):
+    pass
+
+class RelatedProductUpdate(BaseModel):
+    relationship_type: Optional[str] = None
+
+class RelatedProduct(RelatedProductBase):
+    id: int
+    created_at: datetime
+    
+    class Config:
+        from_attributes = True
+
+# Product with related products
+class ProductWithRelated(Product):
+    related_products: List["Product"] = []
+    
+    class Config:
+        from_attributes = True