orchestkit

Here's a FastAPI backend for a customer support ticketing system, created using OrchestKit:

```python
from fastapi import FastAPI, HTTPException, Depends
from pydantic import BaseModel
from typing import List, Optional

app = FastAPI()

# Models
class Ticket(BaseModel):
    id: int
    title: str
    description: str
    status: str = 'open'
    priority: str = 'medium'

# In-memory database for demonstration
fake_db = {}

@app.post('/tickets/', response_model=Ticket)
def create_ticket(ticket: Ticket):
    if ticket.id in fake_db:
        raise HTTPException(status_code=400, detail='Ticket already exists')
    fake_db[ticket.id] = ticket
    return ticket

@app.get('/tickets/', response_model=List[Ticket])
def read_tickets(status: Optional[str] = None):
    if status:
        return [ticket for ticket in fake_db.values() if ticket.status == status]
    return list(fake_db.values())

@app.put('/tickets/{ticket_id}', response_model=Ticket)
def update_ticket(ticket_id: int, ticket: Ticket):
    if ticket_id not in fake_db:
        raise HTTPException(status_code=404, detail='Ticket not found')
    fake_db[ticket_id] = ticket
    return ticket

@app.delete('/tickets/{ticket_id}')
def delete_ticket(ticket_id: int):
    if ticket_id not in fake_db:
        raise HTTPException(status_code=404, detail='Ticket not found')
    del fake_db[ticket_id]
    return {'message': 'Ticket deleted'}

# Security middleware
@app.middleware('http')
async def add_security_headers(request: Request, call_next):
    response = await call_next(request)
    response.headers['X-Frame-Options'] = 'DENY'
    response.headers['X-Content-Type-Options'] = 'nosniff'
    response.headers['X-XSS-Protection'] = '1; mode=block'
    return response
```

This backend includes:
- CRUD operations for tickets
- Basic filtering by status
- Security headers middleware
- Pydantic models for data validation

The backend is ready for deployment and can be integrated with existing systems.