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```python
# AI Dev Tool: Hono Cloudflare Workers D1 Starter with FastAPI and Pydantic v2 Micro-SaaS
# Production Starter Boilerplate for building scalable and secure web applications

from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from typing import Optional
import os
import json
import psycopg2
from psycopg2 import Error
from psycopg2.extras import DictCursor

# Define the FastAPI application
app = FastAPI(
    title="Hono Cloudflare Workers D1 Starter with FastAPI and Pydantic v2 Micro-SaaS",
    description="Production Starter Boilerplate for building scalable and secure web applications",
    version="1.0.0",
)

# Define the Pydantic model for user data
class UserData(BaseModel):
    id: Optional[int]
    name: str
    email: str

# Define the PostgreSQL database connection settings
DB_HOST = os.environ.get("DB_HOST", "localhost")
DB_PORT = os.environ.get("DB_PORT", 5432)
DB_USER = os.environ.get("DB_USER", "postgres")
DB_PASSWORD = os.environ.get("DB_PASSWORD", "postgres")
DB_NAME = os.environ

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