⚡ Live Sandbox: AI Dev Tool: Hono Cloudflare Workers D1

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# Description: Production-ready FastAPI boilerplate with Pydantic v2 for building micro-SaaS applications
# Author: [Your Name]

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel, Field
from typing import Optional
from bun import Database
from hono import Hono

# Initialize FastAPI app
app = FastAPI()

# Initialize Hono API client
hono = Hono(api_key="YOUR_HONO_API_KEY")

# Initialize Bun database client
db = Database("postgresql://user:password@host:port/dbname")

# Define Pydantic models
class User(BaseModel):
    """User model"""
    id: int = Field(..., description="User ID")
    name: str = Field(..., description="User name")
    email: str = Field(..., description="User email")

class Item(BaseModel):
    """Item model"""
    id: int = Field(..., description="Item ID")
    name: str = Field(..., description="Item name")
    description: Optional[str] = Field(None, description="Item description")

# Define routes
@app.get("/users/")

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