diff --git a/herodb/src/models/py/README.md b/herodb/src/models/py/README.md
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+# Business Models Python Port
+
+This directory contains a Python port of the business models from the Rust codebase, using SQLModel for database integration.
+
+## Overview
+
+This project includes:
+
+1. Python port of Rust business models using SQLModel
+2. FastAPI server with OpenAPI/Swagger documentation
+3. CRUD operations for all models
+4. Convenience endpoints for common operations
+
+The models ported from Rust to Python include:
+
+- **Currency**: Represents a monetary value with amount and currency code
+- **Customer**: Represents a customer who can purchase products or services
+- **Product**: Represents a product or service offered
+- **ProductComponent**: Represents a component of a product
+- **SaleItem**: Represents an item in a sale
+- **Sale**: Represents a sale of products or services
+
+## Structure
+
+- `models.py`: Contains the SQLModel definitions for all business models
+- `example.py`: Demonstrates how to use the models with a sample application
+- `install_and_run.sh`: Bash script to install dependencies using `uv` and run the example
+- `api.py`: FastAPI server providing CRUD operations for all models
+- `server.sh`: Bash script to start the FastAPI server
+
+## Requirements
+
+- Python 3.7+
+- [uv](https://github.com/astral-sh/uv) for dependency management
+
+## Installation
+
+The project uses `uv` for dependency management. To install dependencies and run the example:
+
+```bash
+./install_and_run.sh
+```
+
+## API Server
+
+The project includes a FastAPI server that provides CRUD operations for all models and some convenience endpoints.
+
+### Starting the Server
+
+To start the API server:
+
+```bash
+./server.sh
+```
+
+This script will:
+1. Create a virtual environment if it doesn't exist
+2. Install the required dependencies using `uv`
+3. Start the FastAPI server with hot reloading enabled
+
+### API Documentation
+
+Once the server is running, you can access the OpenAPI documentation at:
+
+- Swagger UI: http://localhost:8000/docs
+- ReDoc: http://localhost:8000/redoc
+
+### Available Endpoints
+
+The API provides the following endpoints:
+
+#### Currencies
+- `GET /currencies/`: List all currencies
+- `POST /currencies/`: Create a new currency
+- `GET /currencies/{currency_id}`: Get a specific currency
+- `PUT /currencies/{currency_id}`: Update a currency
+- `DELETE /currencies/{currency_id}`: Delete a currency
+
+#### Customers
+- `GET /customers/`: List all customers
+- `POST /customers/`: Create a new customer
+- `GET /customers/{customer_id}`: Get a specific customer
+- `PUT /customers/{customer_id}`: Update a customer
+- `DELETE /customers/{customer_id}`: Delete a customer
+- `GET /customers/{customer_id}/sales/`: Get all sales for a customer
+
+#### Products
+- `GET /products/`: List all products
+- `POST /products/`: Create a new product
+- `GET /products/{product_id}`: Get a specific product
+- `PUT /products/{product_id}`: Update a product
+- `DELETE /products/{product_id}`: Delete a product
+- `GET /products/available/`: Get all available products
+- `POST /products/{product_id}/components/`: Add a component to a product
+- `GET /products/{product_id}/components/`: Get all components for a product
+
+#### Sales
+- `GET /sales/`: List all sales
+- `POST /sales/`: Create a new sale
+- `GET /sales/{sale_id}`: Get a specific sale
+- `PUT /sales/{sale_id}`: Update a sale
+- `DELETE /sales/{sale_id}`: Delete a sale
+- `PUT /sales/{sale_id}/status/{status}`: Update the status of a sale
+- `POST /sales/{sale_id}/items/`: Add an item to a sale
+- `GET /sales/{sale_id}/items/`: Get all items for a sale
+
+## Dependencies
+
+- SQLModel: For database models and ORM functionality
+- Pydantic: For data validation (used by SQLModel)
+- FastAPI: For creating the API server
+- Uvicorn: ASGI server for running FastAPI applications
+
+## Example Usage
+
+The `example.py` script demonstrates:
+
+1. Creating an SQLite database
+2. Defining and creating tables for the models
+3. Creating sample data (customers, products, sales)
+4. Performing operations on the data
+5. Querying and displaying the data
+
+To run the example manually (after activating the virtual environment):
+
+```bash
+# From the py directory
+python example.py
+
+# Or from the parent directory
+cd py && python example.py
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diff --git a/herodb/src/models/py/__init__.py b/herodb/src/models/py/__init__.py
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+"""
+Python port of the business models from Rust.
+"""
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diff --git a/herodb/src/models/py/api.py b/herodb/src/models/py/api.py
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+#!/usr/bin/env python3
+"""
+FastAPI server providing CRUD operations for business models.
+"""
+import os
+from datetime import datetime
+from typing import List, Optional
+
+from fastapi import Depends, FastAPI, HTTPException, Query
+from fastapi.middleware.cors import CORSMiddleware
+from sqlmodel import Session, SQLModel, create_engine, select
+
+from models import (
+    Currency,
+    Customer,
+    Product,
+    ProductComponent,
+    ProductStatus,
+    ProductType,
+    Sale,
+    SaleItem,
+    SaleStatus,
+)
+
+# Create database
+DATABASE_URL = os.environ.get("DATABASE_URL", "sqlite:///business.db")
+engine = create_engine(DATABASE_URL, echo=False)
+
+# Create tables
+SQLModel.metadata.create_all(engine)
+
+# Create FastAPI app
+app = FastAPI(
+    title="Business API",
+    description="API for business models",
+    version="1.0.0",
+    docs_url="/docs",
+    redoc_url="/redoc",
+    openapi_url="/openapi.json",
+)
+
+# Add CORS middleware
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Dependency to get database session
+def get_session():
+    with Session(engine) as session:
+        yield session
+
+
+# Root endpoint
+@app.get("/")
+async def root():
+    return {"message": "Welcome to the Business API"}
+
+
+# Currency endpoints
+@app.post("/currencies/", response_model=Currency, tags=["Currencies"])
+def create_currency(currency: Currency, session: Session = Depends(get_session)):
+    """Create a new currency"""
+    session.add(currency)
+    session.commit()
+    session.refresh(currency)
+    return currency
+
+
+@app.get("/currencies/", response_model=List[Currency], tags=["Currencies"])
+def read_currencies(
+    skip: int = 0, limit: int = 100, session: Session = Depends(get_session)
+):
+    """Get all currencies"""
+    currencies = session.exec(select(Currency).offset(skip).limit(limit)).all()
+    return currencies
+
+
+@app.get("/currencies/{currency_id}", response_model=Currency, tags=["Currencies"])
+def read_currency(currency_id: int, session: Session = Depends(get_session)):
+    """Get a currency by ID"""
+    currency = session.get(Currency, currency_id)
+    if not currency:
+        raise HTTPException(status_code=404, detail="Currency not found")
+    return currency
+
+
+@app.put("/currencies/{currency_id}", response_model=Currency, tags=["Currencies"])
+def update_currency(
+    currency_id: int, currency_data: Currency, session: Session = Depends(get_session)
+):
+    """Update a currency"""
+    currency = session.get(Currency, currency_id)
+    if not currency:
+        raise HTTPException(status_code=404, detail="Currency not found")
+    
+    # Update currency attributes
+    currency_data_dict = currency_data.dict(exclude_unset=True)
+    for key, value in currency_data_dict.items():
+        setattr(currency, key, value)
+    
+    session.add(currency)
+    session.commit()
+    session.refresh(currency)
+    return currency
+
+
+@app.delete("/currencies/{currency_id}", tags=["Currencies"])
+def delete_currency(currency_id: int, session: Session = Depends(get_session)):
+    """Delete a currency"""
+    currency = session.get(Currency, currency_id)
+    if not currency:
+        raise HTTPException(status_code=404, detail="Currency not found")
+    
+    session.delete(currency)
+    session.commit()
+    return {"message": "Currency deleted successfully"}
+
+
+# Customer endpoints
+@app.post("/customers/", response_model=Customer, tags=["Customers"])
+def create_customer(customer: Customer, session: Session = Depends(get_session)):
+    """Create a new customer"""
+    session.add(customer)
+    session.commit()
+    session.refresh(customer)
+    return customer
+
+
+@app.get("/customers/", response_model=List[Customer], tags=["Customers"])
+def read_customers(
+    skip: int = 0, limit: int = 100, session: Session = Depends(get_session)
+):
+    """Get all customers"""
+    customers = session.exec(select(Customer).offset(skip).limit(limit)).all()
+    return customers
+
+
+@app.get("/customers/{customer_id}", response_model=Customer, tags=["Customers"])
+def read_customer(customer_id: int, session: Session = Depends(get_session)):
+    """Get a customer by ID"""
+    customer = session.get(Customer, customer_id)
+    if not customer:
+        raise HTTPException(status_code=404, detail="Customer not found")
+    return customer
+
+
+@app.put("/customers/{customer_id}", response_model=Customer, tags=["Customers"])
+def update_customer(
+    customer_id: int, customer_data: Customer, session: Session = Depends(get_session)
+):
+    """Update a customer"""
+    customer = session.get(Customer, customer_id)
+    if not customer:
+        raise HTTPException(status_code=404, detail="Customer not found")
+    
+    # Update customer attributes
+    customer_data_dict = customer_data.dict(exclude_unset=True)
+    for key, value in customer_data_dict.items():
+        setattr(customer, key, value)
+    
+    session.add(customer)
+    session.commit()
+    session.refresh(customer)
+    return customer
+
+
+@app.delete("/customers/{customer_id}", tags=["Customers"])
+def delete_customer(customer_id: int, session: Session = Depends(get_session)):
+    """Delete a customer"""
+    customer = session.get(Customer, customer_id)
+    if not customer:
+        raise HTTPException(status_code=404, detail="Customer not found")
+    
+    session.delete(customer)
+    session.commit()
+    return {"message": "Customer deleted successfully"}
+
+
+# Product endpoints
+@app.post("/products/", response_model=Product, tags=["Products"])
+def create_product(product: Product, session: Session = Depends(get_session)):
+    """Create a new product"""
+    session.add(product)
+    session.commit()
+    session.refresh(product)
+    return product
+
+
+@app.get("/products/", response_model=List[Product], tags=["Products"])
+def read_products(
+    skip: int = 0,
+    limit: int = 100,
+    category: Optional[str] = None,
+    status: Optional[ProductStatus] = None,
+    istemplate: Optional[bool] = None,
+    session: Session = Depends(get_session)
+):
+    """Get all products with optional filtering"""
+    query = select(Product)
+    
+    if category:
+        query = query.where(Product.category == category)
+    
+    if status:
+        query = query.where(Product.status == status)
+    
+    if istemplate is not None:
+        query = query.where(Product.istemplate == istemplate)
+    
+    products = session.exec(query.offset(skip).limit(limit)).all()
+    return products
+
+
+@app.get("/products/{product_id}", response_model=Product, tags=["Products"])
+def read_product(product_id: int, session: Session = Depends(get_session)):
+    """Get a product by ID"""
+    product = session.get(Product, product_id)
+    if not product:
+        raise HTTPException(status_code=404, detail="Product not found")
+    return product
+
+
+@app.put("/products/{product_id}", response_model=Product, tags=["Products"])
+def update_product(
+    product_id: int, product_data: Product, session: Session = Depends(get_session)
+):
+    """Update a product"""
+    product = session.get(Product, product_id)
+    if not product:
+        raise HTTPException(status_code=404, detail="Product not found")
+    
+    # Update product attributes
+    product_data_dict = product_data.dict(exclude_unset=True)
+    for key, value in product_data_dict.items():
+        setattr(product, key, value)
+    
+    session.add(product)
+    session.commit()
+    session.refresh(product)
+    return product
+
+
+@app.delete("/products/{product_id}", tags=["Products"])
+def delete_product(product_id: int, session: Session = Depends(get_session)):
+    """Delete a product"""
+    product = session.get(Product, product_id)
+    if not product:
+        raise HTTPException(status_code=404, detail="Product not found")
+    
+    session.delete(product)
+    session.commit()
+    return {"message": "Product deleted successfully"}
+
+
+# Product Component endpoints
+@app.post("/products/{product_id}/components/", response_model=ProductComponent, tags=["Product Components"])
+def create_product_component(
+    product_id: int, component: ProductComponent, session: Session = Depends(get_session)
+):
+    """Add a component to a product"""
+    product = session.get(Product, product_id)
+    if not product:
+        raise HTTPException(status_code=404, detail="Product not found")
+    
+    component.product_id = product_id
+    session.add(component)
+    session.commit()
+    session.refresh(component)
+    return component
+
+
+@app.get("/products/{product_id}/components/", response_model=List[ProductComponent], tags=["Product Components"])
+def read_product_components(
+    product_id: int, session: Session = Depends(get_session)
+):
+    """Get all components for a product"""
+    product = session.get(Product, product_id)
+    if not product:
+        raise HTTPException(status_code=404, detail="Product not found")
+    
+    return product.components
+
+
+# Sale endpoints
+@app.post("/sales/", response_model=Sale, tags=["Sales"])
+def create_sale(sale: Sale, session: Session = Depends(get_session)):
+    """Create a new sale"""
+    # Ensure customer exists if customer_id is provided
+    if sale.customer_id:
+        customer = session.get(Customer, sale.customer_id)
+        if not customer:
+            raise HTTPException(status_code=404, detail="Customer not found")
+    
+    session.add(sale)
+    session.commit()
+    session.refresh(sale)
+    return sale
+
+
+@app.get("/sales/", response_model=List[Sale], tags=["Sales"])
+def read_sales(
+    skip: int = 0, 
+    limit: int = 100, 
+    status: Optional[SaleStatus] = None,
+    customer_id: Optional[int] = None,
+    session: Session = Depends(get_session)
+):
+    """Get all sales with optional filtering"""
+    query = select(Sale)
+    
+    if status:
+        query = query.where(Sale.status == status)
+    
+    if customer_id:
+        query = query.where(Sale.customer_id == customer_id)
+    
+    sales = session.exec(query.offset(skip).limit(limit)).all()
+    return sales
+
+
+@app.get("/sales/{sale_id}", response_model=Sale, tags=["Sales"])
+def read_sale(sale_id: int, session: Session = Depends(get_session)):
+    """Get a sale by ID"""
+    sale = session.get(Sale, sale_id)
+    if not sale:
+        raise HTTPException(status_code=404, detail="Sale not found")
+    return sale
+
+
+@app.put("/sales/{sale_id}", response_model=Sale, tags=["Sales"])
+def update_sale(
+    sale_id: int, sale_data: Sale, session: Session = Depends(get_session)
+):
+    """Update a sale"""
+    sale = session.get(Sale, sale_id)
+    if not sale:
+        raise HTTPException(status_code=404, detail="Sale not found")
+    
+    # Update sale attributes
+    sale_data_dict = sale_data.dict(exclude_unset=True)
+    for key, value in sale_data_dict.items():
+        setattr(sale, key, value)
+    
+    session.add(sale)
+    session.commit()
+    session.refresh(sale)
+    return sale
+
+
+@app.delete("/sales/{sale_id}", tags=["Sales"])
+def delete_sale(sale_id: int, session: Session = Depends(get_session)):
+    """Delete a sale"""
+    sale = session.get(Sale, sale_id)
+    if not sale:
+        raise HTTPException(status_code=404, detail="Sale not found")
+    
+    session.delete(sale)
+    session.commit()
+    return {"message": "Sale deleted successfully"}
+
+
+# Sale Item endpoints
+@app.post("/sales/{sale_id}/items/", response_model=SaleItem, tags=["Sale Items"])
+def create_sale_item(
+    sale_id: int, item: SaleItem, session: Session = Depends(get_session)
+):
+    """Add an item to a sale"""
+    sale = session.get(Sale, sale_id)
+    if not sale:
+        raise HTTPException(status_code=404, detail="Sale not found")
+    
+    item.sale_id = sale_id
+    session.add(item)
+    session.commit()
+    session.refresh(item)
+    
+    # Update the sale's total amount
+    sale.add_item(item)
+    session.add(sale)
+    session.commit()
+    
+    return item
+
+
+@app.get("/sales/{sale_id}/items/", response_model=List[SaleItem], tags=["Sale Items"])
+def read_sale_items(
+    sale_id: int, session: Session = Depends(get_session)
+):
+    """Get all items for a sale"""
+    sale = session.get(Sale, sale_id)
+    if not sale:
+        raise HTTPException(status_code=404, detail="Sale not found")
+    
+    return sale.items
+
+
+# Convenience endpoints
+@app.put("/sales/{sale_id}/status/{status}", response_model=Sale, tags=["Convenience"])
+def update_sale_status(
+    sale_id: int, status: SaleStatus, session: Session = Depends(get_session)
+):
+    """Update the status of a sale"""
+    sale = session.get(Sale, sale_id)
+    if not sale:
+        raise HTTPException(status_code=404, detail="Sale not found")
+    
+    sale.update_status(status)
+    session.add(sale)
+    session.commit()
+    session.refresh(sale)
+    return sale
+
+
+@app.get("/products/available/", response_model=List[Product], tags=["Convenience"])
+def get_available_products(
+    istemplate: Optional[bool] = False,
+    session: Session = Depends(get_session)
+):
+    """Get all available products"""
+    query = select(Product).where(
+        Product.status == ProductStatus.AVAILABLE,
+        Product.purchase_till > datetime.utcnow(),
+        Product.istemplate == istemplate
+    )
+    products = session.exec(query).all()
+    return products
+
+
+@app.get("/customers/{customer_id}/sales/", response_model=List[Sale], tags=["Convenience"])
+def get_customer_sales(
+    customer_id: int, 
+    status: Optional[SaleStatus] = None,
+    session: Session = Depends(get_session)
+):
+    """Get all sales for a customer"""
+    customer = session.get(Customer, customer_id)
+    if not customer:
+        raise HTTPException(status_code=404, detail="Customer not found")
+    
+    query = select(Sale).where(Sale.customer_id == customer_id)
+    
+    if status:
+        query = query.where(Sale.status == status)
+    
+    sales = session.exec(query).all()
+    return sales
+
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run(app, host="0.0.0.0", port=8000)
\ No newline at end of file
diff --git a/herodb/src/models/py/business.db b/herodb/src/models/py/business.db
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diff --git a/herodb/src/models/py/example.py b/herodb/src/models/py/example.py
new file mode 100755
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--- /dev/null
+++ b/herodb/src/models/py/example.py
@@ -0,0 +1,190 @@
+#!/usr/bin/env python3
+"""
+Example script demonstrating the use of the business models.
+"""
+import datetime
+from typing import List
+
+from sqlmodel import Session, SQLModel, create_engine, select
+
+from models import (
+    Currency,
+    Customer,
+    Product,
+    ProductComponent,
+    ProductStatus,
+    ProductType,
+    Sale,
+    SaleItem,
+    SaleStatus,
+)
+
+
+def create_tables(engine):
+    """Create all tables in the database"""
+    SQLModel.metadata.create_all(engine)
+
+
+def create_sample_data(session: Session) -> None:
+    """Create sample data for demonstration"""
+    # Create currencies
+    usd = Currency(currency_code="USD", amount=0.0)
+    eur = Currency(currency_code="EUR", amount=0.0)
+    session.add(usd)
+    session.add(eur)
+    session.commit()
+
+    # Create a customer
+    customer = Customer.new(
+        name="Acme Corporation",
+        description="A fictional company",
+        pubkey="acme123456",
+        contact_sids=["circle1_contact123", "circle2_contact456"]
+    )
+    session.add(customer)
+    session.commit()
+
+    # Create product components
+    cpu_component = ProductComponent.new(
+        name="CPU",
+        description="Central Processing Unit",
+        quantity=1,
+    )
+    ram_component = ProductComponent.new(
+        name="RAM",
+        description="Random Access Memory",
+        quantity=2,
+    )
+    session.add(cpu_component)
+    session.add(ram_component)
+    session.commit()
+
+    # Create products
+    laptop_price = Currency(currency_code="USD", amount=1200.0)
+    session.add(laptop_price)
+    session.commit()
+
+    laptop = Product.new(
+        name="Laptop",
+        description="High-performance laptop",
+        price=laptop_price,
+        type_=ProductType.PRODUCT,
+        category="Electronics",
+        status=ProductStatus.AVAILABLE,
+        max_amount=100,
+        validity_days=365,
+        istemplate=False,
+    )
+    laptop.add_component(cpu_component)
+    laptop.add_component(ram_component)
+    session.add(laptop)
+    session.commit()
+
+    support_price = Currency(currency_code="USD", amount=50.0)
+    session.add(support_price)
+    session.commit()
+
+    support = Product.new(
+        name="Technical Support",
+        description="24/7 technical support",
+        price=support_price,
+        type_=ProductType.SERVICE,
+        category="Support",
+        status=ProductStatus.AVAILABLE,
+        max_amount=1000,
+        validity_days=30,
+        istemplate=True,  # This is a template product
+    )
+    session.add(support)
+    session.commit()
+
+    # Create a sale
+    sale = Sale.new(
+        customer=customer,
+        currency_code="USD",
+    )
+    session.add(sale)
+    session.commit()
+
+    # Create sale items
+    laptop_unit_price = Currency(currency_code="USD", amount=1200.0)
+    session.add(laptop_unit_price)
+    session.commit()
+
+    laptop_item = SaleItem.new(
+        product=laptop,
+        quantity=1,
+        unit_price=laptop_unit_price,
+        active_till=datetime.datetime.utcnow() + datetime.timedelta(days=365),
+    )
+    sale.add_item(laptop_item)
+
+    support_unit_price = Currency(currency_code="USD", amount=50.0)
+    session.add(support_unit_price)
+    session.commit()
+
+    support_item = SaleItem.new(
+        product=support,
+        quantity=2,
+        unit_price=support_unit_price,
+        active_till=datetime.datetime.utcnow() + datetime.timedelta(days=30),
+    )
+    sale.add_item(support_item)
+
+    # Complete the sale
+    sale.update_status(SaleStatus.COMPLETED)
+    session.commit()
+
+
+def query_data(session: Session) -> None:
+    """Query and display data from the database"""
+    print("\n=== Customers ===")
+    customers = session.exec(select(Customer)).all()
+    for customer in customers:
+        print(f"Customer: {customer.name} ({customer.pubkey})")
+        print(f"  Description: {customer.description}")
+        print(f"  Contact SIDs: {', '.join(customer.contact_sids)}")
+        print(f"  Created at: {customer.created_at}")
+
+    print("\n=== Products ===")
+    products = session.exec(select(Product)).all()
+    for product in products:
+        print(f"Product: {product.name} ({product.type_.value})")
+        print(f"  Description: {product.description}")
+        print(f"  Price: {product.price.amount} {product.price.currency_code}")
+        print(f"  Status: {product.status.value}")
+        print(f"  Is Template: {product.istemplate}")
+        print(f"  Components:")
+        for component in product.components:
+            print(f"    - {component.name}: {component.quantity}")
+
+    print("\n=== Sales ===")
+    sales = session.exec(select(Sale)).all()
+    for sale in sales:
+        print(f"Sale to: {sale.customer.name}")
+        print(f"  Status: {sale.status.value}")
+        print(f"  Total: {sale.total_amount.amount} {sale.total_amount.currency_code}")
+        print(f"  Items:")
+        for item in sale.items:
+            print(f"    - {item.name}: {item.quantity} x {item.unit_price.amount} = {item.subtotal.amount} {item.subtotal.currency_code}")
+
+
+def main():
+    """Main function"""
+    print("Creating in-memory SQLite database...")
+    engine = create_engine("sqlite:///business.db", echo=False)
+    
+    print("Creating tables...")
+    create_tables(engine)
+    
+    print("Creating sample data...")
+    with Session(engine) as session:
+        create_sample_data(session)
+    
+    print("Querying data...")
+    with Session(engine) as session:
+        query_data(session)
+
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file
diff --git a/herodb/src/models/py/install_and_run.sh b/herodb/src/models/py/install_and_run.sh
new file mode 100755
index 0000000..103c3e8
--- /dev/null
+++ b/herodb/src/models/py/install_and_run.sh
@@ -0,0 +1,49 @@
+#!/bin/bash
+# Script to install dependencies using uv and run the example script
+
+set -e  # Exit on error
+
+# Change to the directory where this script is located
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+cd "$SCRIPT_DIR"
+echo "Changed to directory: $SCRIPT_DIR"
+
+# Define variables
+VENV_DIR=".venv"
+REQUIREMENTS="sqlmodel pydantic"
+
+# Check if uv is installed
+if ! command -v uv &> /dev/null; then
+    echo "Error: uv is not installed."
+    echo "Please install it using: curl -LsSf https://astral.sh/uv/install.sh | sh"
+    exit 1
+fi
+
+# Create virtual environment if it doesn't exist
+if [ ! -d "$VENV_DIR" ]; then
+    echo "Creating virtual environment..."
+    uv venv "$VENV_DIR"
+fi
+
+# Activate virtual environment
+echo "Activating virtual environment..."
+source "$VENV_DIR/bin/activate"
+
+# Install dependencies
+echo "Installing dependencies using uv..."
+uv pip install $REQUIREMENTS
+
+# Make example.py executable
+chmod +x example.py
+
+# Remove existing database file if it exists
+if [ -f "business.db" ]; then
+    echo "Removing existing database file..."
+    rm business.db
+fi
+
+# Run the example script
+echo "Running example script..."
+python example.py
+
+echo "Done!"
\ No newline at end of file
diff --git a/herodb/src/models/py/models.py b/herodb/src/models/py/models.py
new file mode 100644
index 0000000..d396a2f
--- /dev/null
+++ b/herodb/src/models/py/models.py
@@ -0,0 +1,297 @@
+"""
+Python port of the business models from Rust using SQLModel.
+"""
+from datetime import datetime, timedelta
+from enum import Enum
+import json
+from typing import List, Optional
+
+from sqlmodel import Field, Relationship, SQLModel
+
+
+class SaleStatus(str, Enum):
+    """SaleStatus represents the status of a sale"""
+    PENDING = "pending"
+    COMPLETED = "completed"
+    CANCELLED = "cancelled"
+
+
+class ProductType(str, Enum):
+    """ProductType represents the type of a product"""
+    PRODUCT = "product"
+    SERVICE = "service"
+
+
+class ProductStatus(str, Enum):
+    """ProductStatus represents the status of a product"""
+    AVAILABLE = "available"
+    UNAVAILABLE = "unavailable"
+
+
+class Currency(SQLModel, table=True):
+    """Currency represents a monetary value with amount and currency code"""
+    id: Optional[int] = Field(default=None, primary_key=True)
+    amount: float
+    currency_code: str
+
+    @classmethod
+    def new(cls, amount: float, currency_code: str) -> "Currency":
+        """Create a new currency with amount and code"""
+        return cls(amount=amount, currency_code=currency_code)
+
+
+class Customer(SQLModel, table=True):
+    """Customer represents a customer who can purchase products or services"""
+    id: Optional[int] = Field(default=None, primary_key=True)
+    name: str
+    description: str
+    pubkey: str
+    contact_sids_json: str = Field(default="[]")
+    created_at: datetime = Field(default_factory=datetime.utcnow)
+    updated_at: datetime = Field(default_factory=datetime.utcnow)
+
+    # Relationships
+    sales: List["Sale"] = Relationship(back_populates="customer")
+
+    @property
+    def contact_sids(self) -> List[str]:
+        """Get the contact SIDs as a list"""
+        return json.loads(self.contact_sids_json)
+    
+    @contact_sids.setter
+    def contact_sids(self, value: List[str]) -> None:
+        """Set the contact SIDs from a list"""
+        self.contact_sids_json = json.dumps(value)
+    
+    @classmethod
+    def new(cls, name: str, description: str, pubkey: str, contact_sids: List[str] = None) -> "Customer":
+        """Create a new customer with default timestamps"""
+        customer = cls(
+            name=name,
+            description=description,
+            pubkey=pubkey,
+        )
+        if contact_sids:
+            customer.contact_sids = contact_sids
+        return customer
+
+    def add_contact(self, contact_id: int) -> None:
+        """Add a contact ID to the customer"""
+        # In a real implementation, this would add a relationship to a Contact model
+        # For simplicity, we're not implementing the Contact model in this example
+        self.updated_at = datetime.utcnow()
+        
+    def add_contact_sid(self, circle_id: str, object_id: str) -> None:
+        """Add a smart ID (sid) to the customer's contact_sids list"""
+        sid = f"{circle_id}_{object_id}"
+        sids = self.contact_sids
+        if sid not in sids:
+            sids.append(sid)
+            self.contact_sids = sids
+            self.updated_at = datetime.utcnow()
+
+
+class ProductComponent(SQLModel, table=True):
+    """ProductComponent represents a component of a product"""
+    id: Optional[int] = Field(default=None, primary_key=True)
+    name: str
+    description: str
+    quantity: int
+    created_at: datetime = Field(default_factory=datetime.utcnow)
+    updated_at: datetime = Field(default_factory=datetime.utcnow)
+
+    # Relationships
+    product_id: Optional[int] = Field(default=None, foreign_key="product.id")
+    product: Optional["Product"] = Relationship(back_populates="components")
+
+    @classmethod
+    def new(cls, name: str, description: str, quantity: int) -> "ProductComponent":
+        """Create a new product component with default timestamps"""
+        return cls(
+            name=name,
+            description=description,
+            quantity=quantity,
+        )
+
+
+class Product(SQLModel, table=True):
+    """Product represents a product or service offered"""
+    id: Optional[int] = Field(default=None, primary_key=True)
+    name: str
+    description: str
+    type_: ProductType = Field(sa_column_kwargs={"name": "type"})
+    category: str
+    status: ProductStatus
+    max_amount: int
+    purchase_till: datetime
+    active_till: datetime
+    istemplate: bool = Field(default=False)
+    created_at: datetime = Field(default_factory=datetime.utcnow)
+    updated_at: datetime = Field(default_factory=datetime.utcnow)
+
+    # Price relationship
+    price_id: Optional[int] = Field(default=None, foreign_key="currency.id")
+    price: Optional[Currency] = Relationship()
+
+    # Relationships
+    components: List[ProductComponent] = Relationship(back_populates="product")
+    sale_items: List["SaleItem"] = Relationship(back_populates="product")
+
+    @classmethod
+    def new(
+        cls,
+        name: str,
+        description: str,
+        price: Currency,
+        type_: ProductType,
+        category: str,
+        status: ProductStatus,
+        max_amount: int,
+        validity_days: int,
+        istemplate: bool = False,
+    ) -> "Product":
+        """Create a new product with default timestamps"""
+        now = datetime.utcnow()
+        return cls(
+            name=name,
+            description=description,
+            price=price,
+            type_=type_,
+            category=category,
+            status=status,
+            max_amount=max_amount,
+            purchase_till=now + timedelta(days=365),
+            active_till=now + timedelta(days=validity_days),
+            istemplate=istemplate,
+        )
+
+    def add_component(self, component: ProductComponent) -> None:
+        """Add a component to this product"""
+        component.product = self
+        self.components.append(component)
+        self.updated_at = datetime.utcnow()
+
+    def set_purchase_period(self, purchase_till: datetime) -> None:
+        """Update the purchase availability timeframe"""
+        self.purchase_till = purchase_till
+        self.updated_at = datetime.utcnow()
+
+    def set_active_period(self, active_till: datetime) -> None:
+        """Update the active timeframe"""
+        self.active_till = active_till
+        self.updated_at = datetime.utcnow()
+
+    def is_purchasable(self) -> bool:
+        """Check if the product is available for purchase"""
+        return self.status == ProductStatus.AVAILABLE and datetime.utcnow() <= self.purchase_till
+
+    def is_active(self) -> bool:
+        """Check if the product is still active (for services)"""
+        return datetime.utcnow() <= self.active_till
+
+
+class SaleItem(SQLModel, table=True):
+    """SaleItem represents an item in a sale"""
+    id: Optional[int] = Field(default=None, primary_key=True)
+    name: str
+    quantity: int
+    active_till: datetime
+
+    # Relationships
+    sale_id: Optional[int] = Field(default=None, foreign_key="sale.id")
+    sale: Optional["Sale"] = Relationship(back_populates="items")
+    
+    product_id: Optional[int] = Field(default=None, foreign_key="product.id")
+    product: Optional[Product] = Relationship(back_populates="sale_items")
+    
+    unit_price_id: Optional[int] = Field(default=None, foreign_key="currency.id")
+    unit_price: Optional[Currency] = Relationship(sa_relationship_kwargs={"foreign_keys": "[SaleItem.unit_price_id]"})
+    
+    subtotal_id: Optional[int] = Field(default=None, foreign_key="currency.id")
+    subtotal: Optional[Currency] = Relationship(sa_relationship_kwargs={"foreign_keys": "[SaleItem.subtotal_id]"})
+
+    @classmethod
+    def new(
+        cls,
+        product: Product,
+        quantity: int,
+        unit_price: Currency,
+        active_till: datetime,
+    ) -> "SaleItem":
+        """Create a new sale item"""
+        # Calculate subtotal
+        amount = unit_price.amount * quantity
+        subtotal = Currency(
+            amount=amount,
+            currency_code=unit_price.currency_code,
+        )
+
+        return cls(
+            name=product.name,
+            product=product,
+            quantity=quantity,
+            unit_price=unit_price,
+            subtotal=subtotal,
+            active_till=active_till,
+        )
+
+
+class Sale(SQLModel, table=True):
+    """Sale represents a sale of products or services"""
+    id: Optional[int] = Field(default=None, primary_key=True)
+    status: SaleStatus
+    sale_date: datetime = Field(default_factory=datetime.utcnow)
+    created_at: datetime = Field(default_factory=datetime.utcnow)
+    updated_at: datetime = Field(default_factory=datetime.utcnow)
+
+    # Relationships
+    customer_id: Optional[int] = Field(default=None, foreign_key="customer.id")
+    customer: Optional[Customer] = Relationship(back_populates="sales")
+    
+    total_amount_id: Optional[int] = Field(default=None, foreign_key="currency.id")
+    total_amount: Optional[Currency] = Relationship()
+    
+    items: List[SaleItem] = Relationship(back_populates="sale")
+
+    @classmethod
+    def new(
+        cls,
+        customer: Customer,
+        currency_code: str,
+        status: SaleStatus = SaleStatus.PENDING,
+    ) -> "Sale":
+        """Create a new sale with default timestamps"""
+        total_amount = Currency(amount=0.0, currency_code=currency_code)
+        
+        return cls(
+            customer=customer,
+            total_amount=total_amount,
+            status=status,
+        )
+
+    def add_item(self, item: SaleItem) -> None:
+        """Add an item to the sale and update the total amount"""
+        item.sale = self
+        
+        # Update the total amount
+        if not self.items:
+            # First item, initialize the total amount with the same currency
+            self.total_amount = Currency(
+                amount=item.subtotal.amount,
+                currency_code=item.subtotal.currency_code,
+            )
+        else:
+            # Add to the existing total
+            # (Assumes all items have the same currency)
+            self.total_amount.amount += item.subtotal.amount
+        
+        # Add the item to the list
+        self.items.append(item)
+        
+        # Update the sale timestamp
+        self.updated_at = datetime.utcnow()
+
+    def update_status(self, status: SaleStatus) -> None:
+        """Update the status of the sale"""
+        self.status = status
+        self.updated_at = datetime.utcnow()
\ No newline at end of file
diff --git a/herodb/src/models/py/server.sh b/herodb/src/models/py/server.sh
new file mode 100755
index 0000000..d291078
--- /dev/null
+++ b/herodb/src/models/py/server.sh
@@ -0,0 +1,42 @@
+#!/bin/bash
+# Script to start the FastAPI server
+
+set -e  # Exit on error
+
+# Change to the directory where this script is located
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+cd "$SCRIPT_DIR"
+echo "Changed to directory: $SCRIPT_DIR"
+
+# Define variables
+VENV_DIR=".venv"
+REQUIREMENTS="sqlmodel pydantic fastapi uvicorn"
+
+# Check if uv is installed
+if ! command -v uv &> /dev/null; then
+    echo "Error: uv is not installed."
+    echo "Please install it using: curl -LsSf https://astral.sh/uv/install.sh | sh"
+    exit 1
+fi
+
+# Create virtual environment if it doesn't exist
+if [ ! -d "$VENV_DIR" ]; then
+    echo "Creating virtual environment..."
+    uv venv "$VENV_DIR"
+fi
+
+# Activate virtual environment
+echo "Activating virtual environment..."
+source "$VENV_DIR/bin/activate"
+
+# Install dependencies
+echo "Installing dependencies using uv..."
+uv pip install $REQUIREMENTS
+
+# Make api.py executable
+chmod +x api.py
+
+# Start the FastAPI server
+echo "Starting FastAPI server..."
+echo "API documentation available at: http://localhost:8000/docs"
+uvicorn api:app --host 0.0.0.0 --port 8000 --reload
\ No newline at end of file