API and database models refactoring

models/api/stats.py

@@ -0,0 +1,22 @@
+import re
+from datetime import datetime
+from typing import List, Optional
+
+from pydantic import BaseModel, ConfigDict, EmailStr, Field, field_validator
+
+
+class StatsResponse(BaseModel):
+    total_products: int
+    unique_brands: int
+    unique_categories: int
+    unique_marketplaces: int = 0
+    unique_shops: int = 0
+    total_stock_entries: int = 0
+    total_inventory_quantity: int = 0
+
+
+class MarketplaceStatsResponse(BaseModel):
+    marketplace: str
+    total_products: int
+    unique_shops: int
+    unique_brands: int