⚡ Live Sandbox: AI Dev Tool: Rust WebAssembly Edge (h908)

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# =============================================
# This is a production-ready FastAPI boilerplate with Pydantic v2 for building micro-SaaS applications.
# It includes a PostgreSQL database with vector search extension, Cloudflare Worker integration, and a Next.js Expo monorepo boilerplate.

from fastapi import FastAPI, Depends
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from pydantic import BaseModel
from typing import List
import psycopg2
import psycopg2.extras
import json
from cloudflare import Cloudflare

# Initialize FastAPI app
app = FastAPI()

# Initialize PostgreSQL database connection
conn = psycopg2.connect(
    host="localhost",
    database="mydatabase",
    user="myuser",
    password="mypassword"
)

# Initialize Cloudflare Worker
cf = Cloudflare()

# Define Pydantic models
class User(BaseModel):
    id: int
    name: str
    email: str

class Item(BaseModel):
    id: int
    name: str
    description: str

# Define authentication scheme
security = HTTPBearer()

# Define routes
@app.get("/users/")
async def read_users(credentials

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